People of the State of California v. International Boundary and Water Commission et al

Filing 1

COMPLAINT against International Boundary and Water Commission, Jose Nunez ( Filing fee $ 400 receipt number 0974-11631203.), filed by People of the State of California. (Attachments: #1 Civil Cover Sheet, #2 Exhibit 1, #3 Exhibit 2)The new case number is 3:18-cv-2050-JM-JMA. Judge Jeffrey T. Miller and Magistrate Judge Jan M. Adler are assigned to the case. (Hoos, Phillip)(lrc) (sjt).

193

CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD
SAN DIEGO REG ION
2375 Northside Drive, Suite 100, San Diego, CA 92108
619-516-1990 • Fax [phone]
http://www.waterboards.ca.gov/sandiego/

ORDER NO. R9-2014-0009
AS AMENDED BY ORDER NOS. R9-2014-0094 and R9-2017-0024
NP DES NO. CA0108928
WASTE DISCHARGE REQUIREMENTS
FOR THE UNITED STATES SECTION OF THE
INTERNATIONAL BOUNDARY AND WATER COMMISSION,
SOUTH BAY INTERNATIONAL WASTEWATER TREATMENT PLANT,
DISCHARGE TO THE PACIFIC OCEAN VIA THE SOUTH BAY OCEAN OUTFALL

The following Discharger is subject to waste discharge requirements (WDR's) set forth in this Order:
Table 1. Discharger Information
Discharger
Name of Facility

United States Section of the International Boundary and Water Commission (USIBWC)
South Bay International Wastewater Treatment Plant

Facility Address

San Diego, CA 92154

2995 Clearwater Way
San Diego County

Table 2. Discharge Location
Discharge
Point No.

Effluent Description

Discharge Point
Latitude (North)

001

Secondary treated wastewater

32° 32' 15" N

Discharge Point
Longitude (West)
117° 11' 00"

w

Receiving
Water
Pacific Ocean

Table 3. Administrative Information
June 26, 2014
August 1, 2014
Ju ly 31, 2019

This Order was adopted on:
This Order shall become effective on:
This Order shall expire on:
The Discharger shall file a Report of Waste Discharge as an application for reissuance
of WDR's in accordance with title 23, California Code of Regulations, and an application
for reissuance of a National Pollutant Discharge Elimination System (NPDES) permit no
later than :
The U.S. Environmental Protection Agency (USEPA) and the California Regional Water
Quality Control Board, San Diego Region have classified this discharge as follows:

180 days prior
to the Order
expiration date
Major

I, David W. Gibson, Executive Officer, do hereby certify that this Order with all attachments is a
full, true, and correct copy of the Order adopted by the California Reg ional Water Quality
Control Board, San Diego Region, on June 26, 2014, and amended on November 12, 2014 and
December 13, 2017.

David W. Gibson, Executive Officer

029

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Contents
Facility Information ............................................................................................................................ 3 
Findings ............................................................................................................................................. 3 
Discharge Prohibitions ...................................................................................................................... 4 
Effluent Limitations and Discharge Specifications ............................................................................ 4 
A.  Effluent Limitations and Performance Goals – Discharge Point No. 001 .................................. 4 
1.  Final Effluent Limitations – Discharge Point No. 001 ......................................................... 4 
2.  Performance Goals – Discharge Point No. 001 ................................................................. 6 
3.  Interim Effluent Limitations - Not Applicable .................................................................... 10 
B.  Land Discharge Specifications – Not Applicable ..................................................................... 10 
C.  Recycling Specifications – Not Applicable............................................................................... 10 
V.  Receiving Water Limitations ............................................................................................................ 11 
A.  Surface Water Limitation ......................................................................................................... 11 
B.  Groundwater Limitations – Not Applicable .............................................................................. 12 
VI.  Provisions ........................................................................................................................................ 12 
A.  Standard Provisions ................................................................................................................ 12 
B.  Monitoring and Reporting Program (MRP) Requirements ....................................................... 14 
C.  Special Provisions ................................................................................................................... 14 
1.  Reopener Provisions........................................................................................................ 14 
2.  Special Studies, Technical Reports and Additional Monitoring Requirements ................ 15 
3.  Best Management Practices and Pollution Prevention – Not Applicable ......................... 32 
4.  Construction, Operation and Maintenance Specifications – Not Applicable .................... 32 
5.  Special Provisions for Municipal Facilities (Wastewater Facilities Only) ......................... 32 
6.  Other Special Provisions - Responsibilities, Liabilities, Legal Action, Penalties – Not
Applicable ........................................................................................................................ 43 
7.  Compliance Schedules – Not Applicable ......................................................................... 43 
VII.  Compliance Determination .............................................................................................................. 43 
I. 
II. 
III. 
IV. 

Tables
Table 1. Discharger Information................................................................................................................ 1 
Table 2. Discharge Location ..................................................................................................................... 1 
Table 3. Administrative Information .......................................................................................................... 1 
Table 4. Effluent Limitations at EFF-0011 ................................................................................................. 5 
Table 5. Performance Goals1.................................................................................................................... 6 
Table 6. Sharing Transboundary Wastewater Information with Mexico.................................................. 25 
Table 7. Interim Influent Limitations ........................................................................................................ 34 
Table 8. Sharing Pretreatment Information with Mexico ......................................................................... 37 
Attachments
Attachment A – Abbreviations and Glossary ........................................................................................ A-1 
Attachment B – Map ............................................................................................................................. B-1 
Attachment C – Flow Schematic ........................................................................................................... C-1 
Attachment D – Standard Provisions .................................................................................................... D-1 
Attachment E – Monitoring and Reporting Program ............................................................................. E-1 
Attachment F – Fact Sheet ................................................................................................................... F-1 
Attachment G – Ocean Plan and Basin Plan Prohibitions .................................................................... G-1 
Attachment H – Dilution Model Information .......................................................................................... H-1 

ORDER

PAGE 2

030

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

I.

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

FACILITY INFORMATION
General information about the South Bay International Wastewater Treatment Plant (Facility) is
summarized in Table 1. More detailed information describing the Facility, five canyon collectors,
two pump stations, the South Bay Land Outfall (SBLO), the South Bay Ocean Outfall (SBOO), and
other associated infrastructure (collectively referred to as Facilities) is contained in sections I and II
of the Fact Sheet (Attachment F). Section I of the Fact Sheet also includes information regarding
the Discharger’s permit application.

II.

FINDINGS
The California Regional Water Quality Control Board, San Diego Region (San Diego Water
Board), finds:

A. Legal Authorities. This Order serves as WDR’s pursuant to article 4, chapter 4, division 7 of
the California Water Code (commencing with section 13260). This Order is also issued
pursuant to section 402 of the federal Clean Water Act (CWA) and implementing regulations
adopted by the USEPA and chapter 5.5, division 7 of the Water Code (commencing with
section 13370). It shall serve as an NPDES permit for point source discharges from this
Facility to surface waters.

B. Background and Rationale for Requirements. The San Diego Water Board developed the
requirements in this Order based on information submitted as part of the application, through
monitoring and reporting programs, and other available information. The Fact Sheet
(Attachment F), which contains background information and rationale for the requirements in
this Order, is hereby incorporated into and constitutes Findings for this Order. Attachments A
through E, G, and H are also incorporated into this Order.

C. Provisions and Requirements Implementing State Law. The provisions/requirements in
subsections IV.B, IV.C, V.B, VI.A.2, VI.C.1.b, and VI.C.1.c are included to implement state
law only. These provisions/requirements are not required or authorized under the federal
CWA; consequently, violations of these provisions/requirements are not subject to the
enforcement remedies that are available for NPDES violations.

D. Notification of Interested Parties. The San Diego Water Board has notified the Discharger
and interested agencies and persons of its intent to prescribe WDR’s for the discharge and
has provided them with an opportunity to submit their written comments and
recommendations. Details of the notification are provided in the Fact Sheet (Attachment F).

E. Consideration of Public Comment. The San Diego Water Board, in a public meeting, heard
and considered all comments pertaining to the discharge. Details of the Public Hearing are
provided in the Fact Sheet (Attachment F).

LIMITATIONS AND DISCHARGE REQUIREMENTS

PAGE 3

031

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

THEREFORE, IT IS HEREBY ORDERED, that this Order supersedes Order No. 96-50 except for
enforcement purposes, and, in order to meet the provisions contained in division 7 of the Water
Code (commencing with section 13000) and regulations adopted thereunder, and the provisions of
the CWA and regulations and guidelines adopted thereunder, the Discharger shall comply with the
requirements in this Order. If any part of this Order is subject to a temporary stay of enforcement,
unless otherwise specified in the order granting stay, the Discharger shall comply with the
analogous portions of the previous Order. This action in no way prevents the San Diego Water
Board from taking enforcement action for past violations of the previous Order.
III.

DISCHARGE PROHIBITIONS

A. The discharge of waste from the Facilities to a location other than Discharge Point No. 001,
unless specifically regulated by this Order or separate WDR’s, is prohibited.

B. The Discharger must comply with Discharge Prohibitions contained in the Water Quality
Control Plan for Ocean Waters of California, California Ocean Plan (Ocean Plan),
incorporated into this Order as if fully set forth herein and summarized in Attachment G, as a
condition of this Order.

C. The Discharger must comply with Discharge Prohibitions contained in chapter 4 of the Water
Quality Control Plan for the San Diego Basin (Basin Plan), incorporated into this Order as if
fully set forth herein and summarized in Attachment G, as a condition of this Order.
IV. EFFLUENT LIMITATIONS AND DISCHARGE SPECIFICATIONS
A.

Effluent Limitations and Performance Goals – Discharge Point No. 001
1.

Final Effluent Limitations – Discharge Point No. 001
a.

The Discharger shall maintain compliance with the following effluent limitations at
Discharge Point No. 001, with compliance measured at Monitoring Location EFF001 as described in the Monitoring and Reporting Program (Attachment E):

LIMITATIONS AND DISCHARGE REQUIREMENTS

PAGE 4

032

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Table 4. Effluent Limitations at EFF-0011
Parameter

Units1,2

Effluent Limitations1,3
Average
Instantaneous
Weekly
Minimum
--

Flow

MGD

Average
Monthly
25

Carbonaceous
Biochemical Oxygen
Demand (5-Day at
20°C) (CBOD5)

mg/L

25

40

--

lbs/day

5,213

8,340

--

mg/L
lbs/day

30
6,255

45
9,383

---

mg/L

25

40

75

Total Suspended Solids
(TSS)
Oil and Grease

Instantaneous
Maximum
--

lbs/day
5,213
8,340
15,012
mL/L
1.0
1.5
3.0
NTU
75
100
225
standard
pH
--6.0
9.0
units
BASED ON OCEAN PLAN OBJECTIVES FOR PROTECTION OF MARINE AQUATIC LIFE
6-Month
Maximum
Instantaneous Instantaneous
Median
Daily
Minimum
Maximum
µg/L
3.78E+00
1.52E+01
3.82E+01
Mercury, Total
Recoverable
lbs/day
7.87E-01
3.18E+00
7.96E+00
µg/L
1.16E+03
6.89E+03
-1.84E+04
Zinc, Total Recoverable
lbs/day
2.41E+02
1.44E+03
-3.83E+03
Chronic Toxicity
TUc
-95.6
--Acute Toxicity
TUa
-3.2
--BASED ON OCEAN PLAN OBJECTIVES FOR PROTECTION OF HUMAN HEALTH
30-Day Average
µg/L
1.91E+02
Thallium, Total
Recoverable
lbs/day
3.99E+01
µg/L
1.34E-01
Tributyltin
lbs/day
2.79E-02
µg/L
6.60E-03
Benzidine
lbs/day
1.38E-03
µg/L
2.20E-03
Chlordane1
lbs/day
4.58E-04
µg/L
8.22E+02
Chlorodibromomethane
(dibromochloromethane)
lbs/day
1.71E+02
µg/L
1.63E-02
DDT1
lbs/day
3.39E-03
µg/L
1.91E-03
Heptachlor Epoxide
lbs/day
3.99E-04
µg/L
2.01E-02
Hexachlorobenzene
lbs/day
4.19E-03
µg/L
1.82E-03
PCBs1
lbs/day
3.79E-04
µg/L
3.73E-07
1
TCDD Equivalents
lbs/day
7.77E-08
µg/L
2.01E-02
Toxaphene
lbs/day
4.19E-03
Settleable Solids
Turbidity

1

See Attachment A for definitions of abbreviations and a glossary of common terms used in this Order.

LIMITATIONS AND DISCHARGE REQUIREMENTS

PAGE 5

033

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant
2

3

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

The mass emission rate (MER) limit, in pounds per day, was calculated based on the following equation: MER
(lb/day) = 8.34 x Q x C, where Q is the maximum allowable flow rate (in MGD) and C is the concentration (in mg/L).
Scientific “E” notation is used to express certain values. In scientific “E” notation, the number following the “E”
indicates the position of the decimal point in the value. Negative numbers after the “E” indicate that the value is less
than 1, and positive numbers after the “E” indicate that the value is greater than 1. In this notation a value of 6.1E-02
represents 6.1 x 10-2 or 0.061, 6.1E+02 represents 6.1 x 102 or 610, and 6.1E+00 represents 6.1 x 100 or 6.1.

b.
2.

Percent Removal. The average monthly percent removal1 of CBOD5 and TSS shall
not be less than 85 percent.

Performance Goals – Discharge Point No. 001
Parameters that do not have reasonable potential to cause or contribute to an
exceedance of water quality objectives, or for which reasonable potential to cause or
contribute to an exceedance of water quality objectives cannot be determined, are
referred to as performance goal parameters and are assigned the performance goals
listed in the following table. Performance goal parameters shall be monitored at
Monitoring Location EFF-001 as described in the Monitoring and Reporting Program,
Attachment E. The San Diego Water Board will use the results for informational purposes
only, not compliance determinations.
Table 5. Performance Goals1
Parameter

Unit

1,2

6-Month
Median

Performance Goals1,3
Maximum Instantaneous
Daily
Maximum

30-Day
Average

BASED ON OCEAN PLAN OBJECTIVES FOR PROTECTION OF MARINE AQUATIC LIFE
Arsenic, Total
Recoverable
Cadmium, Total
Recoverable
Chromium VI, Total
Recoverable4
Copper, Total Recoverable
Lead, Total Recoverable
Nickel, Total Recoverable
Selenium, Total
Recoverable
Silver, Total Recoverable

1

7.36E+03

--

5.79E+02

1.54E+03

--

9.56E+01

3.82E+02

9.56E+02

--

lbs/day

1.99E+01

7.97E+01

1.99E+02

--

µg/L

1.91E+02

7.65E+02

1.91E+03

--

lbs/day

3.99E+01

1.59E+02

3.99E+02

--

µg/L

9.76E+01

9.58E+02

2.68E+03

--

lbs/day

2.03E+01

2.00E+02

5.59E+02

--

µg/L

1.91E+02

7.65E+02

1.91E+03

--

lbs/day

3.99E+01

1.59E+02

3.99E+02

--

µg/L

4.78E+02

1.91E+03

4.78E+03

--

lbs/day

9.97E+01

3.99E+02

9.97E+02

--

µg/L

1.43E+03

5.74E+03

1.43E+04

--

lbs/day

2.99E+02

1.20E+03

2.99E+03

--

µg/L

5.18E+01

2.53E+02

6.54E+02

--

lbs/day

1.08E+01

5.27E+01

1.36E+02

--

µg/L

4.81E+02

lbs/day

1.00E+02

µg/L

2.78E+03

See Attachment A for definitions of abbreviations and a glossary of common terms used in this Order.

LIMITATIONS AND DISCHARGE REQUIREMENTS

PAGE 6

034

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Parameter
Cyanide, Total
Recoverable5
Total Chlorine Residual6
Ammonia (expressed as
nitrogen)
Phenolic Compounds
(non-chlorinated)1
Chlorinated Phenolics1
Endosulfan1
Endrin
HCH1

Radioactivity

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

6-Month
Median

Performance Goals1,3
Maximum Instantaneous
Daily
Maximum

µg/L

9.56E+01

3.82E+02

9.56E+02

lbs/day

1.99E+01

7.97E+01

1.99E+02

--

µg/L

1.91E+02

7.65E+02

5.74E+03

--

lbs/day

3.99E+01

1.59E+02

1.20E+03

--

µg/L

5.74E+04

2.29E+05

5.74E+05

--

lbs/day

1.20E+04

4.78E+04

1.20E+05

--

µg/L

2.87E+03

1.15E+04

2.87E+04

--

lbs/day

5.98E+02

2.39E+03

5.98E+03

--

µg/L

9.56E+01

3.82E+02

9.56E+02

--

lbs/day

1.99E+01

7.97E+01

1.99E+02

--

µg/L

8.60E-01

1.72E+00

2.58E+00

--

lbs/day

1.79E-01

3.59E-01

5.38E-01

--

µg/L

1.91E-01

3.82E-01

5.74E-01

--

lbs/day

3.99E-02

7.97E-02

1.20E-01

--

µg/L

3.82E-01

7.65E-01

1.15E+00

--

lbs/day

7.97E-02

1.59E-01

2.39E-01

--

Unit

1,2

pCi/l

30-Day
Average
--

Not to exceed limits specified in title 17, division 1,
chapter 5, subchapter 4, group 3, article 3, section
30253 of the California Code of Regulations,
Reference to section 30253 is prospective, including
future changes to any incorporated provisions of
federal law, as the changes take effect.

BASED ON OCEAN PLAN OBJECTIVES FOR PROTECTION OF HUMAN HEALTH –
NONCARCINOGENS
Acrolein
Antimony, Total
Recoverable
Bis(2-chloroethoxy)
Methane
Bis(2-chloroisopropyl)
Ether
Chlorobenzene
Chromium (III) , Total
Recoverable4
Di-n-butyl Phthalate

-----

-----

2.10E+04
4.39E+03
1.15E+05

lbs/day

-----

µg/L

--

--

--

4.21E+02

lbs/day

--

--

--

8.77E+01

µg/L

--

--

--

1.15E+05

lbs/day

--

--

--

2.39E+04

µg/L

--

--

--

5.45E+04

lbs/day

--

--

--

µg/L
lbs/day
µg/L

2.39E+04

µg/L

--

--

--

1.14E+04
1.82E+07

lbs/day

--

--

--

3.79E+06

µg/L

--

--

--

3.35E+05

lbs/day

--

--

--

6.98E+04

LIMITATIONS AND DISCHARGE REQUIREMENTS

PAGE 7

035

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Dichlorobenzenes1
Diethyl Phthalate
Dimethyl Phthalate
4,6-dinitro-2-methylphenol
2,4-dinitrophenol
Ethylbenzene
Fluoranthene
Hexachlorocyclopentadien
e
Nitrobenzene
Toluene
1,1,1-trichloroethane

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

µg/L

--

--

--

4.88E+05

lbs/day

--

--

--

1.02E+05

µg/L

--

--

--

3.15E+06

lbs/day

--

--

--

6.58E+05

µg/L

--

--

--

7.84E+07

lbs/day

--

--

--

1.63E+07

µg/L

--

--

--

2.10E+04

lbs/day

--

--

--

4.39E+03

µg/L

--

--

--

3.82E+02

lbs/day

--

--

--

7.97E+01

µg/L

--

--

--

3.92E+05

lbs/day

--

--

--

8.17E+04

µg/L

--

--

--

1.43E+03

lbs/day

--

--

--

2.99E+02

µg/L

--

--

--

5.54E+03

lbs/day

--

--

--

1.16E+03

µg/L

--

--

--

4.68E+02

lbs/day

--

--

--

9.77E+01

µg/L

--

--

--

8.13E+06

lbs/day

--

--

--

1.69E+06

µg/L

--

--

--

5.16E+07

lbs/day

--

--

--

1.08E+07

BASED ON OCEAN PLAN OBJECTIVES FOR PROTECTION OF HUMAN HEALTH CARCINOGENS
Acrylonitrile
Aldrin
Benzene
Beryllium, Total
Recoverable
Bis(2-chloroethyl) Ether
Bis(2-ethlyhexyl) Phthalate
Carbon Tetrachloride
Chloroform

µg/L

--

--

--

9.56E+00

lbs/day

--

--

--

1.99E+00

µg/L

--

--

--

2.10E-03

lbs/day

--

--

--

4.39E-04

µg/L

--

--

--

5.64E+02

lbs/day

--

--

--

1.18E+02

µg/L

--

--

--

3.15E+00

lbs/day

--

--

--

6.58E-01

µg/L

--

--

--

4.30E+00

lbs/day

--

--

--

8.97E-01

µg/L

--

--

--

3.35E+02

lbs/day

--

--

--

6.98E+01

µg/L

--

--

--

8.60E+01

lbs/day

--

--

--

1.79E+01

µg/L

--

--

--

1.24E+04

lbs/day

--

--

--

2.59E+03

LIMITATIONS AND DISCHARGE REQUIREMENTS

PAGE 8

036

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

1,4-dichlorobenzene
3,3'-dichlorobenzidine
1,2-dichloroethane
1,1-dichloroethylene
Dichlorobromomethane

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

µg/L

--

--

--

1.72E+03

lbs/day

--

--

--

3.59E+02

µg/L

--

--

--

7.74E-01

lbs/day

--

--

--

1.61E-01

µg/L

--

--

--

2.68E+03

lbs/day

--

--

--

5.58E+02

µg/L

--

--

--

8.60E+01

lbs/day

--

--

--

1.79E+01

µg/L

--

--

--

5.93E+02

lbs/day

--

--

--

1.24E+02

Dichloromethane
(Methylene Chloride)

µg/L

--

--

--

4.30E+04

lbs/day

--

--

--

8.97E+03

1,3-dichloropropene
(1,3-Dichloropropylene)

µg/L

--

--

--

8.51E+02

lbs/day

--

--

--

1.77E+02

µg/L

--

--

--

3.82E-03

lbs/day

--

--

--

7.97E-04

µg/L

--

--

--

2.49E+02

lbs/day

--

--

--

5.18E+01

µg/L

--

--

--

1.53E+01

lbs/day

--

--

--

3.19E+00

µg/L

--

--

--

1.24E+04

lbs/day

--

--

--

µg/L

--

--

--

4.78E-03

lbs/day

--

--

--

9.97E-04

Dieldrin
2,4-dinitrotoluene
1,2-diphenylhydrazine

Halomethanes1

heptachlor
Hexachlorobutadiene
Hexachloroethane
Isophorone
N-nitrosodimethylamine
N-nitrosodi-N-propylamine
N-nitrosodiphenylamine
PAH1
1,1,2,2-tetrachloroethane

2.59E+03

µg/L

--

--

--

1.34E+03

lbs/day

--

--

--

2.79E+02

µg/L

--

--

--

2.39E+02

lbs/day

--

--

--

4.98E+01

µg/L

--

--

--

6.98E+04

lbs/day

--

--

--

1.46E+04

µg/L

--

--

--

6.98E+04

lbs/day

--

--

--

1.46E+04

µg/L

--

--

--

3.63E+01

lbs/day

--

--

--

7.57E+00

µg/L

--

--

--

2.39E+02

lbs/day

--

--

--

4.98E+01

µg/L

--

--

--

8.41E-01

lbs/day

--

--

--

1.75E-01

µg/L

--

--

--

2.20E+02

lbs/day

--

--

--

4.58E+01

LIMITATIONS AND DISCHARGE REQUIREMENTS

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037

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Tetrachloroethylene
(Tetrachloroethene)
Trichloroethylene
(Trichloroethene)
1,1,2-trichloroethane
2,4,6-trichlorophenol
Vinyl Chloride
1
2

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

µg/L

--

--

--

1.91E+02

lbs/day

--

--

--

3.99E+01

µg/L

--

--

--

2.58E+03

lbs/day

--

--

--

5.38E+02

µg/L

--

--

--

8.99E+02

lbs/day

--

--

--

1.87E+02

µg/L

--

--

--

2.77E+01

lbs/day

--

--

--

5.78E+00

µg/L

--

--

--

3.44E+03

lbs/day

--

--

--

7.18E+02

See Attachment A for definitions of abbreviations and a glossary of common terms used in this Order.
The mass emission rate (MER) limit, in pounds per day, was calculated based on the following equation: MER
(lb/day) = 8.34 x Q x C, where Q is the maximum allowable flow rate (in MGD) and C is the concentration (in mg/L).
Scientific “E” notation is used to express certain values. In scientific “E” notation, the number following the “E”
indicates that position of the decimal point in the value. Negative numbers after the “E” indicate that the value is less
than 1, and positive numbers after the “E” indicate that the value is greater than 1. In this notation a value of 6.1E-02
represents 6.1 x 10-2 or 0.061, 6.1E+02 represents 6.1 x 102 or 610, and 6.1E+00 represents 6.1 x 100 or 6.1.
The Discharger may, at their option, apply this performance goal as a total chromium performance goal.
If a Discharger can demonstrate to the satisfaction of the San Diego Water Board (subject to USEPA approval) that
an analytical method is available to reliably distinguish between strongly and weakly complexed cyanide, effluent
limitations for cyanide may be met by (or performance goals may be evaluated with) the combined measurement of
free cyanide, simple alkali metals cyanides, and weakly complexed organometallic cyanide complexes. In order for
the analytical method to be acceptable, the recovery of free cyanide from metal complexes must be comparable to
that achieved by the approved method in title 40 Code of Federal Regulations (CFR) part 136, as revised May 14,
1999.
The water quality objectives for total chlorine residual applicable to intermittent discharges not exceeding two hours,
shall be determined through the use of the following equation:
log y = -0.43 (log x) + 1.8,
where y = the water quality objective (in µg/l) to apply when chlorine is being discharged;
x = the duration of uninterrupted chlorine discharge in minutes.
Actual effluent limitations for total chlorine, when discharging intermittently, shall then be determined according to
Implementation Procedures for Table 1 from the Ocean Plan, using a minimum probable initial dilution factor of 94.6
and a flow rate of 25 MGD.

3

4
5

6

3.

Interim Effluent Limitations - Not Applicable

B.

Land Discharge Specifications – Not Applicable

C.

Recycling Specifications – Not Applicable

LIMITATIONS AND DISCHARGE REQUIREMENTS

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038

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

V.

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

RECEIVING WATER LIMITATIONS
A.

Surface Water Limitation
The receiving water limitations set forth below for ocean waters are based on water quality
objectives contained in the Basin Plan and Ocean Plan and are a required part of this Order.
The discharge of waste shall not cause or contribute to violation of these limitations in the
Pacific Ocean. Compliance with these limitations shall be determined from samples collected
at stations representative of the area within the waste field where initial dilution is completed.
1.

Bacterial Characteristics
a.

Within a zone bounded by the shoreline and a distance of three nautical miles from
the shoreline, including all kelp beds, the following bacterial objectives shall be
maintained throughout the water column. The zone of initial dilution for the ocean
outfall is excluded.
i.

30-day Geometric Mean – The following standards are based on the geometric
mean of the five most recent samples from each site:
a)

Total coliform density shall not exceed 1,000 per 100 mL;

b)

Fecal coliform density shall not exceed 200 per 100 mL; and

c)

Enterococcus density shall not exceed 35 per 100 mL.

ii. Single Sample Maximum:
a)

Total coliform density shall not exceed 10,000 per 100 mL;

b)

Fecal coliform density shall not exceed 400 per 100 mL;

c)

Enterococcus density shall not exceed 104 per 100 mL; and

d)

Total coliform density shall not exceed 1,000 per 100 mL when the fecal
coliform/total coliform ratio exceeds 0.1.

b.

c.

2.

The Initial Dilution Zone of wastewater outfall shall be excluded from designation as
kelp beds for purposes of bacterial standards. Adventitious assemblages of kelp
plants on waste discharge structures (e.g., outfall pipes and diffusers) do not
constitute kelp beds for purposes of bacterial standards.
At all areas where shellfish may be harvested for human consumption, as
determined by the San Diego Water Board, the median total coliform density shall
not exceed 70 per 100 mL throughout the water column, and not more than 10
percent of the samples shall exceed 230 per 100 mL.

Physical Characteristics
a.

Floating particulates and grease and oils shall not be visible.

b.

The discharge of waste shall not cause aesthetically undesirable discoloration of the
ocean surface.

c.

Natural light shall not be significantly reduced at any point outside the initial dilution
zone as a result of the discharge of waste.

LIMITATIONS AND DISCHARGE REQUIREMENTS

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039

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

d.
3.

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

The rate of deposition of inert solids and the characteristics of inert solids in the
ocean sediments shall not be changed such that benthic communities are degraded.

Chemical Characteristics
a.

b.

The pH shall not be changed at any time more than 0.2 units from that which occurs
naturally.

c.

The dissolved sulfide concentration of waters in and near sediments shall not be
significantly increased above that present under natural conditions.

d.

The concentration of substances set forth in Chapter II, Table 1 of the Ocean Plan,
shall not be increased in marine sediments to levels that would degrade indigenous
biota.

e.

The concentration of organic materials in marine sediments shall not be increased
to levels that would degrade marine life.

f.

Nutrient materials shall not cause objectionable aquatic growths or degrade
indigenous biota.

g.

4.

The dissolved oxygen concentration shall not at any time be depressed more than
10 percent from that which occurs naturally, as the result of the discharge of oxygen
demanding waste materials.

Numerical water quality objectives established in Chapter II, Table 1 of the Ocean
Plan apply to all discharges within the jurisdiction of the Ocean Plan. Unless
otherwise specified, all metal concentrations are expressed as total recoverable
concentrations.

Biological Characteristics
a.
b.

The natural taste, odor, color of fish, shellfish, or other marine resources used for
human consumption shall not be altered.

c.

5.

Marine communities, including vertebrate, invertebrate, and plant species, shall not
be degraded.

The concentration of organic materials in fish, shellfish, or other marine resources
used for human consumption shall not bioaccumulate to levels that are harmful to
human health.

Radioactivity
Discharge of radioactive waste shall not degrade marine life.

B.

Groundwater Limitations – Not Applicable

VI. PROVISIONS
A.

Standard Provisions
1.

The Discharger shall comply with all Standard Provisions included in Attachment D of
this Order.

2.

The Discharger shall comply with the following provisions. In the event that there is any
conflict, duplication, or overlap between provisions specified by this Order, the more
stringent provision shall apply.
a.

The Facility shall be supervised and operated by persons possessing certificates of
appropriate grade pursuant to title 23, division 3, chapter 26 of the California Code

LIMITATIONS AND DISCHARGE REQUIREMENTS

PAGE 12

040

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

of Regulations (CCR). The Facility shall be provided with a sufficient number of
qualified personnel to operate the Facility effectively so as to achieve the required
level of treatment at all times.
b.

All proposed new treatment facilities and expansions of existing treatment facilities
shall be completely constructed and operable prior to initiation of the discharge from
the new or expanded facilities. The Discharger shall submit a certification report for
each new canyon collector, treatment facility, expansion of an existing treatment
facility, and design capacity re-ratings. The certification report shall be prepared by
the design engineer. For design capacity re-ratings, the certification report shall be
prepared by the engineer who evaluated the treatment facility design capacity. The
signature and engineering license number of the engineer preparing the certification
report shall be affixed to the report. If reasonable, the certification report shall be
submitted prior to beginning construction.
i.

The certification report shall:
a)

Identify the design capacity of the treatment facility, including the daily and
30-day design capacity;

b)

Certify the adequacy of each component of the treatment facility; and

c)

Contain a requirement-by-requirement analysis, based on acceptable
engineering practices, of the process and physical design of the facility to
ensure compliance with this Order.

ii. The Discharger shall not initiate a discharge from an existing treatment facility at
a daily flow rate in excess of its previously approved design capacity until:
a)

The certification report is received by the San Diego Water Board;

b)

The San Diego Water Board has received written notification of completion
of construction (new treatment facilities and expansions only);

c)

An inspection of the facility has been made by the San Diego Water Board
or its designated representatives (new treatment facilities and expansions
only); and

d)

The San Diego Water Board has provided the Discharger with written
authorization to discharge at a daily flow rate in excess of its previously
approved design capacity.

c.

All waste treatment, containment, and disposal facilities shall be protected against
100-year peak stream flows as defined by the San Diego County flood control
agency.

d.

All waste treatment, containment, and disposal facilities shall be protected against
erosion, overland runoff, and other impacts resulting from a 100-year, 24-hour storm
event.

e.

This Order expires on July 31, 2019, after which, the terms and conditions of this
permit are automatically continued pending issuance of a new permit, provided that
all requirements of USEPA’s NPDES regulations at 40 CFR section 122.6 and the

LIMITATIONS AND DISCHARGE REQUIREMENTS

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041

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

State’s regulations at title 23, division 3, chapter 9, article 3, section 2235.4 of the
CCR regarding the continuation of expired permits and waste discharge
requirements are met.
f.
B.

A copy of this Order shall be posted at a prominent location at or near the treatment
and disposal facilities and shall be available to operating personnel at all times.

Monitoring and Reporting Program (MRP) Requirements
The Discharger shall comply with the MRP, and future revisions thereto, in Attachment E of
this Order.

C.

Special Provisions
1.

Reopener Provisions
a.

This Order may be reopened for modification to include an effluent limitation if
monitoring establishes that the discharge causes, has the reasonable potential to
cause, or contributes to an excursion above a performance goal(s) set forth in
section IV.A.2, Table 5, of this Order or as otherwise described in Ocean Plan Table
1. (40 CFR section 122.44(d)(1))

b.

This Order may be reopened for modification of the monitoring and reporting
requirements and/or special studies requirements, at the discretion of the San Diego
Water Board. Such modification(s) may include, but is (are) not limited to, revision(s)
(i) to implement recommendations from Southern California Coastal Water
Research Project (SCCWRP), (ii) to develop, refine, implement, and/or coordinate a
regional monitoring program, (iii) to develop and implement improved monitoring
and assessment programs in keeping with San Diego Water Board Resolution No.
R9-2012-0069, Resolution in Support of a Regional Monitoring Framework, and/or
(iv) to add provisions to require the Discharger to evaluate and provide information
on cost and values of the monitoring and reporting program.

c.

This Order may be modified, revoked and reissued, or terminated for cause
including, but not limited to, the following:
i.

Violation of any terms or conditions of this Order. (Water Code section 13381(a))

ii. Obtaining this Order by misrepresentation or failure to disclose fully all relevant
facts. (Water Code section 13381(b))
iii. A change in any condition that requires either a temporary or permanent
reduction or elimination of the permitted discharge. (Water Code section
13381(c))
d.

The filing of a request by the Discharger for modifications, revocation and
reissuance, or termination of this Order does not stay any condition of this Order.
Notification by the Discharger of planned operational or facility changes or
anticipated noncompliance with this Order does not stay any condition of this Order.
(40 CFR section 122.41(f))

e.

If any applicable toxic effluent standard or prohibition (including any schedule of
compliance specified in such effluent standard or prohibition) is promulgated under
section 307(a) of the CWA for a toxic pollutant and that standard or prohibition is
more stringent than any limitation on the pollutant in this Order, the San Diego
Water Board may institute proceedings under these regulations to modify or revoke

LIMITATIONS AND DISCHARGE REQUIREMENTS

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042

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

and reissue the Order to conform to the toxic effluent standard or prohibition. (40
CFR section 122.4(b)(1))
f.
g.

This Order may be reopened and modified to revise effluent limitations as a result of
future Basin Plan Amendments, or the adoption of a total maximum daily load
(TMDL) for the receiving water. (40 CFR section 122.62(a)(2))

h.

This Order may be reopened upon submission by the Discharger of adequate
information, as determined by the San Diego Water Board, to provide for dilution
credits or a mixing zone, as may be appropriate. (40 CFR section 122.62(a)(2))

i.

2.

This Order may be reopened and modified, in accordance with the provisions set
forth in 40 CFR parts 122 and 124.

This Order may also be reopened and modified, revoked and, reissued or
terminated in accordance with the provisions of 40 CFR sections 122.44, 122.62 to
122.64, and 125.62. Causes for taking such actions include, but are not limited to,
failure to comply with any condition of this Order and permit, and endangerment to
human health or the environment resulting from the permitted activity.

Special Studies, Technical Reports and Additional Monitoring Requirements
a.

Spill and Transboundary Wastewater Flow Event Prevention and Response
Plan.
i.

Spill and Transboundary Wastewater Flow Event Types. For purposes of
section VI.C.2, spill and transboundary wastewater flow event types are defined
and categorized as set forth below. Event types do not include waste discharges
to the Pacific Ocean at SBOO Discharge Point No. 001 or discharges of waste
from the Facilities specifically regulated by separate waste discharge
requirements or an NPDES permit.
a)

Spill from the Facilities (Facilities Spill Event). A discharge of treated or
untreated wastewater or other material to the environment that occurs from
the Discharger’s Facilities, including, but not limited to, the entire
wastewater conveyance, storage, treatment, and disposal system
(wastewater system) that is owned and operated by the Discharger. The
wastewater system includes all devices and system components used such
as pipes, pump stations, force mains, Junction Box 1, Junction Box 2, the
five canyon collector systems, the treatment works, SBLO, and SBOO.

b)

Transboundary Wastewater Flow Past the Canyon Collector System
(Flow Event Type A). A dry weather transboundary treated or untreated
wastewater or other flow through a conveyance structure owned and
operated by the United States Government into Smuggler Gulch, Goat
Canyon, Canyon del Sol, Stewart’s Drain, or Silva Drain and not diverted
into the canyon collector system for treatment at the Facility.

c)

Transboundary Wastewater Flow Event or Other Spill/Wastewater
Flow Event in Mexico (Flow Event Type B). A dry weather spill or dry
weather transboundary wastewater or other flow (not categorized in other
Event Types above) that creates, or threatens to create, pollution or
nuisance conditions in waters of the United States and/or State including
the Tijuana River (main channel), Yogurt Canyon drainage, other unnamed

LIMITATIONS AND DISCHARGE REQUIREMENTS

PAGE 15

043

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

drainages and nearby coastal marine waters. These spills or transboundary
flows include, but are not limited to the following:
1)

A dry weather transboundary treated or untreated wastewater flow in
waters of the Tijuana River (main channel) as described in
Commitment No. 16 of IBWC Minute No. 283 (Conceptual Plan for the
International Solution to the Border Sanitation Problem in San Diego,
California/Tijuana, Baja California, July 2, 1990).

2)

A dry weather transboundary treated or untreated wastewater flow
through a conveyance structure owned and operated by the United
States Government into Yogurt Canyon.

3)

Spills or wastewater flows occurring in Mexico that the Discharger has
knowledge of.

ii. Development and Submittal. The Discharger shall prepare and submit a Spill
and Transboundary Wastewater Flow Prevention and Response Plan
(Prevention/Response Plan) to the San Diego Water Board, via the State Water
Board’s California Integrated Water Quality System (CIWQS) Program Web site,
no later than 180 days after the adoption of this Order. The
Prevention/Response Plan shall be developed in consultation with the Comisión
Internacional de Limites y Aguas (CILA, the Mexican Section of the IBWC), the
San Diego Water Board, the County of San Diego Department of Environmental
Health (DEH), and other interested stakeholders. At a minimum, the
Prevention/Response Plan shall address the three types of events identified
above in section VI.C.2.a.i of this Order and shall include the following elements:
a)

Goal. The goal of the Prevention/Response Plan shall be described and
consistent with the following criteria:
1)
2)

Protect public health and safety; and

3)

b)

Reduce, eliminate and prevent the recurrence of spills and
transboundary wastewater flows;

Prevent adverse impacts to the environment from spills and
transboundary wastewater flows, including but not limited to, adverse
impacts to waters of the United States and/or State.

Desired Outcomes. The Prevention/Response Plan shall be consistent
with the following desired outcomes:
1)

Prompt notification and reporting of spills and transboundary
wastewater flows to appropriate regulatory agencies, municipalities,
and other potentially affected entities is ensured;

2)

Effective measures are identified, documented and implemented to
prevent, reduce, and eliminate spills and transboundary wastewater
flows;

LIMITATIONS AND DISCHARGE REQUIREMENTS

PAGE 16

044

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

3)
4)

Effective remedial measures are implemented to 1) control or limit the
spill and/or transboundary wastewater flow volume, 2) terminate the
spill and/or transboundary wastewater flow, and 3) recover as much of
the spill and/or transboundary wastewater flow volume as possible for
proper disposal, including any wash down water; and

5)

c)

Compliance with the requirements of this Order is achieved and
maintained;

A framework for binational actions and cooperation in achieving the
goals and desired outcomes of the Prevention/Response Plan is
established and followed by the Discharger and CILA and the following
agencies to the extent that these agencies are willing and able to
participate, Secretaría de Protección al Ambiente (SPA), Comisión
Estatal de Servicios Públicos de Tijuana (CESPT), Procuraduría
Federal de Protección al Ambiente (PROFEPA), Comisión Nacional
del Agua (CONAGUA), and the City of Tijuana’s Secretaría de
Desarrollo Urbano y Ecología (SDUE).

Roles and Responsibilities. The Prevention/Response
Prevention/Response Plan shall:
1)

Identify the duly authorized individual(s) or position(s) having overall
responsibility for the development and implementation of the
Prevention/Response Plan on behalf of the Discharger as described in
Attachment D of this Order, Special Provisions, section V.B;

2)

Identify the names of all key individuals, associated position titles, email addresses and telephone numbers, including management,
administrative, contractor and maintenance positions, responsible for
implementing specific measures described in the Prevention/Response
Plan, on behalf of the Discharger; and

3)

Provide a complete description of the roles and responsibilities, and
lines of authority for implementation of the Prevention/Response Plan
with respect to the Discharger, including organization chart(s) or similar
document(s).

4)

Provide a complete description of the roles and responsibilities, and
lines of authority for implementation of the Prevention/Response Plan
with respect to CILA, SPA, CESPT, PROFEPA, CONAGUA, and
SDUE, including organization chart(s) or similar document(s) to the
extent that they are available. The Discharger shall request in writing
this information to assist the Discharger in implementing the
Prevention/Response Plan. The Discharger shall include a copy of the
request and CILA’s response to the request in the
Prevention/Response Plan. If CILA refuses or does not confirm within
one month, the Discharger shall communicate the same to the San
Diego Water Board in writing in a timely manner.

LIMITATIONS AND DISCHARGE REQUIREMENTS

PAGE 17

045

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

d)

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Communication and Coordination with Mexico. The
Prevention/Response Plan shall document the framework and procedures
for coordination between the Discharger, CILA, SPA, CESPT, the San
Diego Water Board, and interested parties through regular meetings and
written or oral communication to:
1)

2)

Develop binational emergency response and notification procedures
for loss of wastewater infrastructure capacity on either side of the
international border;

3)

Review existing plans, specifications and reports of key wastewater
infrastructure on both sides of the international border;

4)

Assist CILA and local agencies in Mexico, as requested by these
entities through IBWC, in preventing, reducing, terminating, and
recovering transboundary wastewater flows;

5)

Provide a framework for binational actions and cooperation in
achieving the goals and desired outcomes of the Prevention/Response
Plan; and

6)

e)

Develop procedures for reducing, eliminating, and preventing
recurrence of transboundary wastewater flows resulting from an
emergency or unanticipated outages of wastewater infrastructure on
either side of the international border;

Optimize use of available wastewater infrastructure capacity on both
sides of the international border. This topic shall include, but is not
limited to, use of an emergency connection to the City of San Diego
sewage collection system, increases in available sewage collection
and treatment capacity in Tijuana, and increase in wastewater flow
diversion to the IWTP.

Inspection and Preventative Maintenance Program. The
Prevention/Response Plan shall provide a program for routine inspection
and preventative maintenance of the entire wastewater system that is
owned and operated by the Discharger including backup power and
electrical systems. The inspection and preventative maintenance program
shall include the following components:
1)

Map, Flow Diagrams, and Design Capacity Documentation. The
Prevention/Response Plan shall provide an accurate map and flow
diagram, and the design capacity for each key component of the entire
Discharger’s wastewater system as well as the main wastewater
conveyance and treatment system in Mexico. The information shall
address key pipes, force mains, pump stations, treatment plant
capacities, and all discharge point(s).

2)

Inspection and Preventative Maintenance Program. The
Prevention/Response Plan shall provide a description of the routine
inspection and preventative maintenance program for the Discharger’s

LIMITATIONS AND DISCHARGE REQUIREMENTS

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046

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

wastewater system. The description shall include schedules, protocols,
documentation procedures, and associated activities for inspection,
preventative maintenance, and cleaning. The documentation
procedures shall include the system used to document the inspection
and preventive maintenance activities, such as work orders. The
Prevention/Response Plan shall include exercising and testing of all
key systems and components to verify adequate operation of the
system and associated backup alarms.
Each canyon collector shall be inspected daily. The
Prevention/Response Plan shall also provide a description of the
specific circumstances, mechanisms, and frequency of occurrence
whereby the hydraulic capacity of the canyon collector systems is
reduced below its design capacity from stoppage, blockage, debris
obstructions, vandalism or other causes that impact or limit the flow of
wastewater into and through the canyon collector systems. The
Prevention/Response Plan shall identify the best practices and
procedures employed by the Discharger to reduce, prevent, or
eliminate the severity and impact of these mechanisms and to restore
the system’s functional capacity to handle transboundary wastewater
flows at the design capacity flow rate as quickly as possible. These
practices and procedures shall also address the steps taken or
planned to ensure adequate clearing and removal of accumulated
sand/silt and blockages and correction of all capacity deficiencies in
the canyon collector systems within 96 hours following a storm event of
0.1 inches or greater (i.e. 24 hours after wet weather, as defined in
Attachment A).
3)

4)

f)

Replacement Components. The Prevention/Response Plan shall also
describe practices for identifying key replacement components and
maintaining an adequate inventory of critical replacement components.
Log Maintenance and Retention of Records. The
Prevention/Response Plan shall provide for maintaining a log of all
pertinent inspection, cleaning, maintenance and repair records for at
least five (5) years for use in identifying and prioritizing system
deficiencies in order to devise a corrective action strategy to prevent
future spills.

Rehabilitation and Replacement. The Prevention/Response Plan shall
describe a rehabilitation and replacement program to detect, identify, and
address any structural deficiencies, or other system devices or components
that have caused or are likely to cause spills from the Discharger’s
wastewater system. Structural deficiencies include, but are not limited to,
major pipe breaks and cracks, inadequate pipe slopes, internal corrosion
areas, areas of significant root intrusion, and inadequate hydraulic capacity.
The rehabilitation and replacement program shall provide for identification,
ranking and prioritizing of system deficiencies and implementation of shortterm and long-term rehabilitation or replacement actions to address each
identified deficiency. Rehabilitation and replacement activities should focus
on infrastructure that is older and at risk or prone to more frequent blockage

LIMITATIONS AND DISCHARGE REQUIREMENTS

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047

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

due to sediment or debris. The Prevention/Response Plan shall also
describe a capital improvement program which manages and preserves
infrastructure assets, identifies and ranks infrastructure rehabilitation and
replacement capital projects, provides a planning and implementation
schedule, and identifies options for obtaining the funding needed to
implement the program.
g)

Training. The Prevention/Response Plan shall describe a program for
providing training to ensure that the Discharger’s employees, contractors,
and other representatives are adequately trained and possess adequate
knowledge, skills and abilities to implement the Prevention/Response Plan.

h)

Facilities Spill and Transboundary Wastewater Spill Containment and
Cleanup. This section of the Prevention/Response Plan shall apply to
Facilities Spill Event and Flow Event Type A.
The Prevention/Response Plan shall describe guidelines and procedures
for taking all feasible steps and necessary remedial actions to 1) control or
limit the spill and/or transboundary wastewater flow volume, 2) terminate
the spill and/or transboundary wastewater flow, and 3) recover as much of
the spill and/or transboundary wastewater flow volume as possible for
proper disposal, including any wash down water. The Prevention/Response
Plan shall incorporate the following components:
1)

Investigation and Assessment. The Prevention/Response Plan shall
describe procedures for spill and/or transboundary wastewater flow
investigation and assessment including volume estimation, adequate
monitoring to determine the nature and impact of the event,
identification of receiving waters impacted, calls for additional backup
support, and notification of appropriate agencies as required under
section VI.C.2.d of this Order.

2)

Containment. Procedures for containment of the spill and/or
transboundary wastewater flow volume including but not limited to the
following actions:
i)
ii)

Containment in downstream storm drains and plugging
downstream storm drain outlets to capture the spill and/or
transboundary wastewater flow if possible; and

iii)
3)

Use of sand bags or containment barriers;

Excavation as necessary to establish containment of spill and/or
transboundary wastewater flow.

Cleanup. Procedures for cleanup of the spill and/or transboundary
wastewater flow including but not limited to the following actions:
i)

Collection of solid and liquid material and other debris;

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048

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

ii)

Vacuum truck recovery of wastewater or polluted water and wash
down water;

iii)

Cleanup of debris within the affected area(s); and

iv) Clean-up of impacted storm drains in accordance with NPDES
storm water permit.
i)

Notifications and Reporting. This section of the Prevention/Response
Plan shall apply to Facilities Spill Event and Flow Event Type A. The
Prevention/Response Plan shall describe procedures for prompt notification
and reporting of these spills to appropriate parties as described in section
VI.C.2.d of this Order. The Prevention/Response Plan shall provide for
maintenance of a regularly updated notification and reporting contact list
(emails and phone numbers) and adequate public notification to protect the
public from exposure to spills and/or transboundary wastewater flows.
Written notifications and reports should be provided to appropriate
regulatory agencies, municipalities, and other potentially affected entities to
the extent required by this Order, other permits and licenses, state and
federal laws, local ordinances or as otherwise described in the
Prevention/Response Plan. These organizations shall include, but are not
be limited to:
1)

California Governor's Office of Emergency Services (Cal OES);

2)

DEH;

3)

San Diego Water Board;

4)

California Department of Fish and Wildlife;

5)

U.S. Fish and Wildlife Service;

6)

City of Imperial Beach;

7)

City of San Diego;

8)

USEPA

9)

Local water agencies if a water supply has been affected;

10) Interested non-governmental organizations (NGOs); and
11) Other interested parties.
j)

Documentation. The Prevention/Response Plan shall include procedures
for documentation of each event as required under section VI.C.2.d of this
Order including, but not limited to, a description of the spill event and its
cause; exact dates and times for when the event started, when the
Discharger responded, when the event stopped, when containment and
cleanup occurred, the volume recovered, the volume released to the

LIMITATIONS AND DISCHARGE REQUIREMENTS

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049

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

environment, notifications made, and the steps taken or planned to mitigate
and prevent recurrence of the event.
k)

Notifications and Reporting of Transboundary Wastewater Flows or
Other Spills within Mexico. This section of the Prevention/Response Plan
shall apply to Flow Event Type B. The Prevention/Response Plan shall
describe procedures for notification and reporting of Flow Event Type B.
These events should be reported within 24 hours of the time the Discharger
becomes aware of the event. The procedures shall provide for notification
and reporting of such events to governmental agencies, municipalities, and
other organizations as described in section VI.C.2.a.ii.i) above. (The
Discharger is not responsible for the investigation, assessment,
containment, cleanup, or documentation of such events, but only for the
reporting of such events for which the Discharger becomes aware.)

iii. Prevention/Response Plan Implementation. Upon receipt, the San Diego
Water Board will issue a public notice and release the Prevention/Response
Plan for public review and comment for a minimum of 30 days. The Discharger
must consider revisions to the Prevention/Response Plan based on written
comments received during the specified comment period. The Discharger must
submit a revised Prevention/Response Plan, with responses to written
comments received, to the San Diego Water Board no later than 60 days after
the close of the comment period. The Discharger shall commence with
implementation of the Prevention/Response Plan immediately upon submission
of the revised Prevention/Response Plan unless otherwise directed in writing by
the San Diego Water Board Executive Officer.
a) Prevention/Response Plan Amendment. The Discharger shall conduct
regular review and assessment of the Prevention/Response Plan to identify
improvements and modify it as necessary to reduce, eliminate, and prevent
the recurrence of spills and/or transboundary wastewater flows. The
Discharger shall keep the Prevention/Response Plan in an up-to-date
condition and shall amend the Prevention/Response Plan whenever there is
a change (e.g., in the design, construction, operation, or maintenance of the
Facilities) which materially affects the potential for spill and/or transboundary
wastewater flow events; or which materially affects the response required for
each event. The Discharger shall include any modifications as an
amendment to the Prevention/Response Plan submittal in CIWQS within 30
days of making the amendment.
b) Prevention/Response Plan Posting. A copy of the most current
Prevention/Response Plan shall be posted at a prominent location at or near
the Facility and shall be readily available to Discharger’s employees,
contractors, and other representatives at all times. The Discharger shall also
post a publically available internet accessible copy of the most current
Prevention/Response Plan on the Discharger’s website.

LIMITATIONS AND DISCHARGE REQUIREMENTS

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050

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

b.

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Sharing Transboundary Wastewater Flow Information with Mexico
i.

The Discharger shall meet with CILA to share the approved
Prevention/Response Plan and answer any questions about its content within
one year of the adoption of this Order. The Discharger shall request in writing
that CILA share the approved Prevention/Response Plan with SPA, CESPT,
PROFEPA, CONAGUA, and SDUE. If CILA refuses or does not confirm within
one month, the Discharger shall communicate the same to the San Diego Water
Board in writing in a timely manner. A copy of the written request to CILA and
written confirmation from CILA shall be included as an amendment to the
Prevention/Response Plan submittal in CIWQS.

ii. The Discharger shall conduct binational technical committee meetings, with
simultaneous translation services, if needed, on transboundary wastewater flow
prevention and response in the international border region periodically but no
less than two times per year. The Discharger shall invite CILA, the San Diego
Water Board, and USEPA to attend. In consultation with CILA, the Discharger
shall consider inviting additional stakeholders including, but not limited to, the
County of San Diego, the City of San Diego, the City of Imperial Beach,
California State Parks, U.S. Fish and Wildlife, California Department of Fish and
Wildlife, SPA, CESPT, PROFEPA, CONAGUA, SDUE, and NGOs, such as
Tijuana-based Tijuana Calidad de Vida and Proyecto Fronterizo de Educación
Ambiental, WILDCOAST, Surfrider Foundation San Diego, and San Diego
Coastkeeper. The Discharger shall prepare an agenda with input from invited
stakeholders and shall prepare a meeting summary after the meeting and
distribute it to all invited stakeholders. The binational technical committee
meetings for the transboundary wastewater flows can be combined with the
binational technical committee meetings for the pretreatment required in section
VI.C.5.b.i. The Discharger shall promote discussion of binational interests,
including but not limited to the following:
a)

Development and improvement of binational prevention, response, and
notification procedures of spills and/or transboundary wastewater flows due
to loss of wastewater infrastructure capacity on either side of the
international border or other problems;

b)

Review of existing and proposed plans, specifications, and reports for key
wastewater infrastructure on both sides of the international border;

c)

Assist CILA and local agencies in Mexico, as requested by these entities
through IBWC, in identifying, preventing, reducing, terminating, and
recovering spills and/or transboundary wastewater flows;

d)

Optimizing use of available wastewater infrastructure capacity on both
sides of the international border to reduce, eliminate, and prevent the
recurrence of spills and/or transboundary wastewater flows. This topic shall
include, but is not limited to, use of an emergency connection to the City of
San Diego sewage collection system, increases in available sewage
collection and treatment capacity in Tijuana, and increase in wastewater
flow diversion to the IWTP;

LIMITATIONS AND DISCHARGE REQUIREMENTS

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051

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

e)

Share and discuss the current version of the Prevention/Response Plan;

f)

Share and discuss Tijuana River, transboundary canyons, and coastal
water quality data, and discuss possible sources of contamination; and

g)

Development and improvement of binational actions and cooperation in
achieving the goals and desired outcomes of the Prevention/Response
Plan.

iii. In the event Mexico fails to prevent a discharge of treated or untreated
wastewaters into waters of the Tijuana River that cross the international
boundary as described in Commitment No. 16 of IBWC Minute No. 283, the
Discharger’s Commissioner or designee shall, within 24 hours of becoming
aware of the event, notify the Commissioner of CILA or designee in writing that
such a discharge has occurred and request that special measures be taken to
immediately stop such discharges and make any necessary repairs in
accordance with Commitment No. 16 of IBWC Minute No. 283. If CILA refuses
or does not confirm within one day, the Discharger will communicate the same in
writing to the San Diego Water Board in a timely manner.
iv. The Discharger shall share the monthly self-monitoring report (SMR) required in
Attachment E of this Order with CILA on or before the due date for submittal to
the San Diego Water Board. The monthly SMR shall include the monthly
transboundary wastewater flow report as required in section VII.B.4 of
Attachment E of this Order.
v. The Discharger shall prepare technical presentations which clearly summarize
transboundary wastewater flows and compares the flows with the flows
occurring during the previous year for the same time periods and year to date.
The presentations shall include the information listed in section VI.B.4 of
Attachment E of this Order, as well as any other information on the
circumstances and impacts of the transboundary wastewater flows and ways to
improve the prevention of, and response to, transboundary wastewater flows.
The presentation may be combined with the pretreatment technical presentation
required in section VI.C.5.b.iv of this Order.
a)

The Discharger shall meet with CILA each quarter to share the approved
presentations and answer any questions about its content. If no
transboundary flows occurred during any given quarter, the Discharger is
not required to prepare a technical presentation for that quarter. If there is
no technical presentation for that quarter, the Discharger is not required to
meet with CILA for that quarter.

b)

The Discharger shall request in writing that CILA share the approved
presentations at venues hosted by the regulated community at least once, if
appropriate venues are available. If CILA refuses or fails to confirm within
one month, the Discharger shall communicate the same to the San Diego
Water Board in a timely manner.

c)

The Discharger shall request in writing that CILA share the approved
presentations with SPA and CESPT. If CILA refuses or does not confirm

LIMITATIONS AND DISCHARGE REQUIREMENTS

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052

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

within one month, the Discharger will communicate the same to the San
Diego Water Board in a timely manner.
d)

The presentations shall be processed in accordance with the following
schedule unless the Discharger is otherwise directed in writing by the San
Diego Water Board:

Table 6. Sharing Transboundary Wastewater Information with Mexico
Quarterly
Presentation Period1

Discharger
Share
Presentations
with CILA

January 1 through
March 31
April 1 through June
30
July 1 through
September 30
October 1 through
December 31
1

Presentations Due to
the San Diego Water
Board for approval

May 15

June 1

Discharger
Request for CILA
to Share
Presentations
with CESPT and
SPA
June 15

August 15

September 1

September 15

November 15

December 1

December 15

February 15

March 1

March 15

If no transboundary flows occurred during any given quarter, the Discharger is not required to prepare a technical
presentation for that quarter. If there is no technical presentation for that quarter, the Discharger is not required to
meet with CILA for that quarter.

vi. The Discharger may, for reasons of international protocol, submit the agenda,
meeting summary, monthly SMR, technical presentation, and other documents
described in section VI.C.2.b to CILA in English. If the documents are submitted
in English, the Discharger shall request in writing that CILA translate the
documents into Spanish prior to distribution to the stakeholders in Mexico. If
CILA does not translate the documents as requested, the Discharger shall do
the translation.
c.

Other Transboundary Wastewater Flow Requirements
i.

The Discharger shall work through CILA to coordinate with SPA and/or CESPT
in preventing, reducing, terminating, and recovering transboundary wastewater
flows. Efforts to achieve this goal shall include, but are not limited to, improved
communication between the Discharger, CILA, SPA, and CESPT; and providing
training, available funding, and other assistance to SPA and CESPT.

ii. Annually, the Discharger shall request in writing from CILA the information listed
below for the previous calendar year. If CILA refuses or fails to provide this
information by March 1, the Discharger shall communicate the same to the San
Diego Water Board in writing in a timely manner.
a)

A brief description of any programs CILA and local agencies in Mexico
implements to prevent, reduce, terminate, and recover transboundary
wastewater flows;

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053

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

b)

c)

A summary of the annual transboundary wastewater flow prevention and
response budget, including the cost of program functions and equipment
purchases; and

d)

d.

A brief description of any significant changes in transboundary wastewater
flow prevention and response activities which differ from the previous year
including, but not limited to, changes concerning administrative structures,
monitoring programs or monitoring frequencies, legal authority,
enforcement policies, funding levels, or staffing levels;

A summary of all activities undertaken to educate the public on how to
prevent wastewater discharges (e.g. reducing discharges of fats, oils, and
grease into the sewage collection system).

Spill and Transboundary Wastewater Flow Event Notification and Reporting
Requirements
The Discharger shall report spills and transboundary wastewater flows in
accordance with the following procedures for Facilities Spill Events and Flow Events
Type A. The San Diego Water Board requests that the Discharger apply this section
of the Prevention/Response Plan to Flow Events Type B.
i.

Facilities Spill Events and Flow Events Types A and B, as defined in section
VI.C.2.a.i above, shall be categorized for notification and reporting purposes as
follows:
a)

Category 1 include discharges that contain wastewater of any volume that:
1) Reach surface water and/or reach a drainage channel tributary to a
surface water; or 2) Reach a Municipal Separate Storm Sewer System
(MS4), and are not fully captured and returned to the Facilities or not
otherwise captured and disposed of properly. Any volume not recovered
from the MS4 is considered to have reached surface water unless the MS4
discharges to a dedicated storm water or groundwater infiltration basin
(e.g., infiltration pit, percolation pond).

b)

Category 2 includes discharges that contain wastewater of 1,000 gallons or
greater that do not reach surface water, a drainage channel, or a MS4.

c)

Category 3 includes all other discharges that contain wastewater.

d)

Category 4 includes discharges of hazardous substances.

e)

Category 5 includes discharges of oil or petroleum products.

f)

Category 6 includes discharges of other materials related to the facilities
that may endanger health or the environment.

ii. Within two hours of becoming aware of any Category 1 Event greater than or
equal to 1,000 gallons discharged to surface water or a spill or flow to a location
where it probably will be discharged to surface water, the Discharger shall notify
the Cal OES and obtain a notification control number. The Discharger shall

LIMITATIONS AND DISCHARGE REQUIREMENTS

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054

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

provide the information requested by Cal OES before receiving a control
number. Spill/flow information requested by Cal OES may include:
a)

Name of person notifying Cal OES and direct return phone number.

b)

Estimated spill/flow volume (gallons).

c)

If ongoing, estimated spill/flow rate (gallons per minute).

d)

Spill/flow incident description including a brief narrative, on-scene point of
contact for additional information (name and cell phone number); date and
time Discharger became aware of the spill/flow; location of discharge;
cause of the spill/flow (if known).

e)

Indication of whether the spill/flow has been contained.

f)

Indication of whether surface water is impacted.

g)

Name of surface water impacted by the spill/flow, if applicable.

h)

Indication of whether a drinking water supply is or may be impacted by the
spill/flow.

i)

Any other known spill/flow impacts.

j)

Spill/flow incident location (address, city, state, and zip code).

Following the initial notification to Cal OES and until such time that the
Discharger submits a certified report, the Discharger shall provide updates to
Cal OES regarding substantial changes to the estimated volume of untreated or
partially treated wastewater discharged and any substantial change(s) to known
impact(s).
iii. For Category 1 and 2 Events, the Discharger shall submit a preliminary report
within three business days of becoming aware of the spill/flow by email to the
San Diego Water Board ([e-mail]), DEH, local
municipalities, and other interested parties. At a minimum, the following
mandatory information shall be included in the preliminary report:
a)

Spill/flow contact information. (Name and telephone number of the
Discharger contact person who can answer specific questions about the
spill/flow being reported).

b)

Spill/flow location name.

c)

Global Positioning System (GPS) coordinates for the spill/flow location. If a
single spill event results in multiple appearance points, provide GPS
coordinates for each appearance point.

d)

Whether or not the spill/flow reached surface water, a drainage channel, or
entered and was discharged from a drainage structure.

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055

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

e)

Whether or not the spill/flow reached a MS4. If known, provide the name of
the jurisdiction that owns or operates the MS4 and estimate the spill/flow
volume that may have entered the MS4.

f)

Whether or not the total spill/flow volume that reached a MS4 was fully
recovered. If not, estimate the volume that was recovered from the MS4 (if
applicable).

g)

Estimate of the spill/flow volume, inclusive of all discharge point(s).

h)

Estimate of the spill/flow volume that reached surface water, a drainage
channel, or was not recovered from an MS4. If known, provide the name of
the surface water body, drainage channel, or drainage structure.

i)

Estimate of the spill/flow volume recovered from all sources and media (if
applicable).

j)

Number of spill/flow appearance point(s).

k)

Description and location of spill/flow appearance point(s). If a single
sewage collection system failure results in multiple spill appearance points,
each appearance point must be described.

l)

Spill/flow start date and time.

m) Date and time the Discharger was notified of, or self-discovered, the
spill/flow.
n)

Estimated operator arrival time.

o)

Spill/flow end date and time or expected end date and time.

p)

Date and time when cleanup was completed (if applicable);

q)

Probable cause of the spill/flow (if known)

r)

For spills/flows greater than or equal to 1,000 gallons, the date and time Cal
OES was called.

s)

For spills/flows greater than or equal to 1,000 gallons, the Cal OES control
number.

iv. For Category 1 and 2 Events, the Discharger shall submit a certified report
within 15 calendar days of spill/flow end date by email to the San Diego Water
Board ([e-mail]), DEH, local municipalities, and
interested parties. The report shall be signed and certified as required in
Attachment D, section V.B At a minimum, the following mandatory information
shall be reported for the certified report, in addition to all fields in subsection iii
above :
a)

Description of spill/flow destination(s).

LIMITATIONS AND DISCHARGE REQUIREMENTS

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056

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

b)

Spill/flow end date and time.

c)

Spill/flow cause(s) (e.g. pipe blockage; fats, oil, and grease; root intrusion;
pipe break; pump station failure; power outage; component failure;
inadequate hydraulic capacity; inflow and infiltration; or vandalism).

d)

Spill/flow failure point (pump station, junction point, etc.).

e)

Whether or not the spill/flow was associated with a storm event.

f)

Description of spill/flow corrective actions, including steps planned or taken
to reduce, eliminate, and prevent reoccurrence of the spill/flow; and a
schedule of major milestones for those steps.

g)

Description of spill/flow response activities.

h)

Spill/flow response completion date.

i)

Whether or not there is an ongoing investigation, the reasons for the
investigation, and the expected date of completion.

j)

Whether or not health warnings were posted as a result of the spill/flow.

k)

Name of beach(es) closed and/or impacted.

l)

Name of surface water(s) impacted.

m) Location and number of water quality samples collected or reason why no
samples collected.
n)

Parameters for which the water quality samples (if any) were analyzed.

o)

Regulatory agencies that received sample results (if any).

p)

Description of methodology(ies) and data relied upon for estimations of the
spill/flow volume and amount recovered.

v. For Category 4 Events, as soon as (A) the Discharger has knowledge of the
discharge, (B) notification is possible, and (C) notification can be provided
without substantially impeding cleanup or other emergency measures, the
Discharger shall immediately notify the Cal OES of the discharge in accordance
with the spill reporting provision of the state toxic disaster contingency plan
adopted pursuant to article 3.7 (commencing with section 8574.16) of chapter 7
of division 1 of title 2 of the Government Code. (Water Code section 13271)
vi. For Category 5 Events, as soon as (1) the Discharger has knowledge of the
discharge, (2) notification is possible, and (3) notification can be provided
without substantially impeding cleanup or other emergency measures, the
Discharger shall immediately notify the Office of Emergency Services of the
discharge in accordance with the spill reporting provision of the California oil spill
contingency plan adopted pursuant to article 3.5 (commencing with section
8574.1) of chapter 7 of division 1 of title 2 of the Government Code. This section
LIMITATIONS AND DISCHARGE REQUIREMENTS

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057

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

shall not apply to spills of oil into marine waters as defined in Subdivision (f) of
section 8670.3 of the Government Code. (Water Code section 13272)
vii. For Category 6 Events, the Discharger shall notify the San Diego Water Board
([e-mail]), DEH, local municipalities, and
interested parties within 24 hours of becoming aware of the discharge.
viii. For all Facilities Spill Events, the Discharger shall include a detailed summary of
spills in the monthly self-monitoring report for the month in which the spill
occurred, as required in section VI.A of Attachment E of this Order.
ix. The spill/flow reporting requirements contained in this Order do not relieve the
Discharger of responsibilities to report spills/flows to other agencies, such as the
Cal OES and DEH.
e.

Toxicity Reduction Evaluation (TRE)
i.

TRE Workplan Development and Submittal. The Discharger shall develop
and submit a TRE workplan to the San Diego Water Board, via the State Water
Board’s CIWQS Program Web site, within 180 days of the adoption of this
Order. The TRE workplan shall incorporate TRE procedures established in
available USEPA guidance documents2, including, but not limited to, the
following information:
a)
b)

Roles and responsibilities of the team conducting the TRE;

c)

A description of reasonable anticipated actions to be undertaken by the
Discharger to investigate, identify and correct the causes of toxicity;

d)

Provisions and criteria for implementation of a Toxicity Identification
Evaluation (TIE), as necessary, based upon the magnitude and persistence
of toxicity effluent limitation exceedances;

e)

Provisions for data evaluation and interpretation;

f)

Provision for follow-up actions and communications, including
communications with CILA, SPA, PROFEPA, and CESPT, to reduce
toxicity in instances where the probable cause of the toxicity effluent
limitation exceedances is attributable to sources in Mexico; and

g)

2

Criteria for determining that the discharge consistently exceeds a toxicity
effluent limitation;

Provisions for development of a schedule for completion of all activities and
submission of a final report within 30 days of completion of the TRE.

See (a) TRE Guidance for Municipal Wastewater Treatment Plants (EPA 833-B-99-002, 1999); (b) Generalized
Methodology for Conducting Industrial Toxicity Reduction Evaluations (EPA/600/2-88/070); Toxicity
Identification Evaluation, Phase I (EPA/600/6-91/005F); (c) Methods for Aquatic Toxicity Identification
Evaluations, Phase II (EPA/600/R-92/080); (d) Methods for Aquatic Toxicity Identification Evaluations, Phase
III (EPA/600/R-92/081); and (e) Marine Toxicity Identification Evaluation (TIE): Phase I Guidance Document
(EPA/600/R-96-054,1996).

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058

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

ii. TRE Workplan Approval and Implementation. The Discharger shall
implement the TRE Workplan (60) days after submission unless otherwise
directed in writing to modify it by the San Diego Water Board. The Discharger
shall post and maintain an up-to-date copy of the TRE Workplan on the
Discharger’s website.
iii. Requirement to Conduct TRE. If the effluent limitation for acute or chronic
toxicity is exceeded in any one test, the Discharger shall conduct a TRE if the
toxicity is exceeded in any of the next six (6) succeeding tests performed at 14day intervals and notify the San Diego Water Board. After the acute or chronic
toxicity exceedance, the Discharger shall continue to conduct the routine weekly
monitoring for both acute and chronic toxicity as required in Attachment E of this
Order.
The TRE shall be conducted in accordance with the approved TRE workplan
and available USEPA guidance documents3. Within 30 days of completion of the
TRE, the Discharger shall submit a TRE Final Report on the results of the TRE
to the San Diego Water Board. The TRE Final Report shall include the following:
a)

A description of the probable source and cause of the toxicity effluent
limitation exceedances (if known);

b)

A summary of the findings including a tabulation, evaluation, and
interpretation of the data generated;

c)

Copies of any written request to CILA for assistance and any responses
received;

d)

A list of corrective actions taken or planned by the Discharger and/or CILA
to reduce toxicity so that the Discharger can achieve consistent compliance
with the toxicity effluent limitation of this Order and prevent recurrence of
exceedances of the limitation; and

e)

If the exceedances of the toxicity effluent limitation have not been
corrected, the anticipated time it is expected to continue and a time
schedule for the steps planned to reduce, eliminate, and prevent recurrence
of the exceedances.

The Discharger shall implement any planned corrective actions assigned to the
Discharger in the TRE Final Report in accordance with the specified time
schedule, unless otherwise directed in writing by the San Diego Water Board.
The corrective actions and time schedule shall be modified at the direction of the
San Diego Water Board.
iv. Sharing TRE Information with Mexico
a) TRE Workplan. Sixty days after submitting the TRE Workplan, or as
otherwise directed in writing by the San Diego Water Board, the Discharger
shall a) provide a copy of the approved TRE Workplan to CILA; and b) meet
3

Ibid

LIMITATIONS AND DISCHARGE REQUIREMENTS

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059

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

with CILA to answer any questions about its content. The Discharger shall
request in writing that CILA share the approved TRE Workplan with SPA
and CESPT and shall provide a copy of the request to the San Diego Water
Board. If CILA refuses or does not confirm within one month, the Discharger
shall communicate the same to the San Diego Water Board in writing in a
timely manner.
b) TRE Final Report. If the TRE Final Report, described in section VI.C.2.e.iii
of this Order, determines that the toxicity effluent limitation exceedances
were, or likely were, attributable to the introduction of pollutants into the
Facility from Mexico, then the Discharger shall provide a copy of the TRE
Final Report to CILA within 30 days after completion of the TRE Final
Report. The TRE Final Report shall be provided to CILA. The Discharger
also shall meet with CILA and answer any questions about the content of the
TRE Final Report. The Discharger shall request in writing that CILA share
the TRE Final Report with SPA and CESPT and request their assistance in
addressing the probable sources and causes of the toxicity effluent limitation
exceedances. The Discharger shall provide a copy of the request to the San
Diego Water Board. If CILA refuses or does not confirm within one month,
the Discharger shall communicate the same to the San Diego Water Board
in writing in a timely manner.
c) The Discharger may, for reasons of international protocol, submit the TRE
Workplan, TRE Final Report, and other documents described in section
VI.C.2.e.iv to CILA in English. If the documents are submitted in English, the
Discharger shall request in writing that CILA translate the documents into
Spanish prior to distribution to the stakeholders in Mexico. If CILA does not
translate the documents as requested, the Discharger shall do the
translation.
3.

Best Management Practices and Pollution Prevention – Not Applicable

4.

Construction, Operation and Maintenance Specifications – Not Applicable

5.

Special Provisions for Municipal Facilities (Wastewater Facilities Only)
a.

Influent Limitations
i.

In consultation with CILA the Discharger shall develop and comply with mass
emission rates and concentration limitations for the influent to the Facility
(influent limitations), or Maximum Allowable Headworks Allocations (MAHA), for
pollutants that may cause or contribute to interference, pass through, or the
other problems described at 40 CFR section 403.5. The influent limitations shall
prevent violations of the Ocean Plan and this Order. At a minimum, the following
information shall be considered in developing the influent limitations:
a)

Wastewater characteristics -- Monthly average plant operational data
from the Facility and other wastewater monitoring data after secondary
treatment was completed.

b)

Effluent limitations and discharge specifications -- The analysis shall
be conducted using the effluent limitations and discharge specifications
contained in this Order.

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060

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

c)

Inhibition/interference data -- Literature from USEPA guidance or other
sources. The analysis shall include, but is not be limited to,
inhibition/inference from litter, sand, and sediment.

d)

Process removal data -- If influent and effluent values are available, actual
removal rates from advanced primary and secondary treatment operating
data at the Facility shall be calculated. If sufficient data are not available,
literature values from the USEPA Water Engineering Research Laboratory
(WERL) Treatability Database may be used. A mass balance (input-output)
approach shall be conducted to convert criteria into allowable headworks
loadings. This includes tracing the routes of each pollutant through the
treatment process, taking into account pollutant removals in treatment units.

e)

Background data -- Values for domestic/background levels from USEPA
guidance or other sources.

f)

Safety factor – The Discharger, in consultation with CILA, shall
recommend and evaluate appropriate approaches regarding growth, slug
loadings, and data uncertainty.

The Discharger shall submit the report with the proposed influent limitations to
the San Diego Water Board via the State Water Board’s CIWQS Program Web
site, no later than one year after the adoption of this Order, for approval and
incorporation into this Order.
ii. Until the San Diego Water Board approves the influent limitations developed by
the Discharger pursuant to section VI.C.5.a.i of this Order, the Discharger shall
comply with the interim limitations for the influent to the Facility set forth in Table
6 below. Compliance with these interim influent limitations shall be measured at
Monitoring Location INF-001 as described in the Monitoring and Reporting
Program, Attachment E. The final influent limitations developed under section
VI.C.5.a.i of this Order and approved by the San Diego Water Board will be
incorporated into this Order and will supersede the interim limitations set forth in
Table 6 below.

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061

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Table 7. Interim Influent Limitations
Parameter

Units

Arsenic, Total
Recoverable
Beryllium, Total
Recoverable
Cadmium, Total
Recoverable
Chromium, Total
Recoverable
Copper, Total
Recoverable
Cyanide, Total
Recoverable
Lead, Total
Recoverable
Mercury, Total
Recoverable
Nickel, Total
Recoverable
Silver, Total
Recoverable
Zinc, Total
Recoverable
Total HCH
(Lindane)

ug/L
lbs/day
ug/L
lbs/day
ug/L
lbs/day
ug/L
lbs/day
ug/L
lbs/day
ug/L
lbs/day
ug/L
lbs/day
ug/L
lbs/day
ug/L
lbs/day
ug/L
lbs/day
ug/L
lbs/day
ug/L
lbs/day

Average
Monthly
24
5.0
2.5
0.52
61
13
1100
230

Influent Limitation
Instantaneous Six-Month
Maximum
Median

150
32
75
16
160
34
5.4
1.1
440
93
52
11
1100
220
0.42
0.88

iii. Any exceedance of an interim or final influent limitation, as applicable, is
inconsistent with IBWC Minute No. 283 of July 2, 1990. The Discharger shall
take all actions available under U.S. law and international treaty and agreement
to achieve compliance with those limitations. If the Discharger is unable to
achieve compliance with the influent limitations, the Discharger shall formally
elevate the matter in writing within the U.S. Department of State regarding the
reasons for lack of progress and offer strategies for addressing the difficulties.
The Discharger shall encourage elevated diplomatic attention by the U.S.
Department of State to issues that the Discharger has been unable to resolve.
Similarly, USEPA shall elevate discussion within the Office of Water and the
Office of International Activities. A copy of the written request to the U.S.
Department of State shall be submitted to the San Diego Water Board in a
timely manner.
b.

Sharing Pretreatment Information with Mexico
i.

The Discharger shall conduct binational technical committee meetings
periodically but no less than twice per year, with simultaneous translation
services, if needed. The Discharger shall invite CILA, the San Diego Water
Board, and USEPA to attend. In consultation with CILA, the Discharger shall
consider inviting additional stakeholders including, but not limited to, SPA,
CESPT, PROFEPA, and other local authorities in the United States and Mexico.
The Discharger shall prepare an agenda with input from invited stakeholders

LIMITATIONS AND DISCHARGE REQUIREMENTS

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062

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

and shall prepare a meeting summary after the meeting and distribute to all
invited stakeholders. The binational technical committee meetings for
pretreatment can be combined with the binational technical committee meetings
for transboundary wastewater flows required in section VI.C.2.b.ii. The
Discharger shall promote discussion of binational interests, including but not
limited to the following information:
(1) influent monitoring data;
(2) a comparison of influent monitoring data compared to the influent
limitations, including identification of any exceedances of influent limitations;
(3) an analysis of the influent monitoring data, including an evaluation and
interpretation of the influent data and a discussion of any actual or potential
adverse effect(s) attributable to the influent on the Facility treatment works,
including but not limited to interference as defined in 40 CFR section
403.3(k), pass through of pollutants as defined in 40 CFR section 403.3(p),
or acute worker health and safety problems or other problems as defined in
40 CFR section 403.5(b); and
(4) a description of the steps taken or planned by the Discharger and/or the
government of Mexico to reduce, eliminate, and prevent the reoccurrence of
noncompliance with influent limitations or any actual or potential adverse
effect(s) attributable to the influent on the Facility treatment works.
ii. In the event of an exceedance of an influent limitation, the Commissioner of the
Discharger or designee shall notify the Commissioner of CILA or designee in
writing within 24 hours of becoming aware of the exceedance.
iii. The Discharger shall share the monthly SMR required in Attachment E of this
Order with CILA on or before the due date for submittal to the San Diego Water
Board. The monthly SMR shall include at a minimum the following information:
(1) influent monitoring data;
(2) a comparison of influent monitoring data compared to the influent
limitations, including identification of any exceedances of influent limitations;
(3) an analysis of the influent monitoring data, including an evaluation and
interpretation of the influent data and a discussion of any actual or potential
adverse effect(s) attributable to the influent on the Facility treatment works,
including but not limited to interference as defined in 40 CFR section
403.3(k), pass through of pollutants as defined in 40 CFR section 403.3(p),
or acute worker health and safety problems or other problems as defined in
40 CFR section 403.5(b); and
(4) a description of the steps taken or planned by the Discharger and/or the
government of Mexico to reduce, eliminate, and prevent the reoccurrence of
noncompliance with influent limitations or any actual or potential adverse
effect(s) attributable to the influent on the Facility treatment works.
iv. Each quarter, the Discharger shall prepare technical presentations which clearly
do the following:
(1) summarizes influent monitoring data for the Facility;
LIMITATIONS AND DISCHARGE REQUIREMENTS

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063

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

(2) compares the influent monitoring data to the influent limitations, identifying
any exceedances of influent limitations
(3) compares the current influent monitoring data with the influent monitoring
data from the previous year for the same time periods;
(4) analyses the influent monitoring data, including an evaluation and
interpretation of the influent data and a discussion of any actual or potential
adverse effect(s) attributable to the influent on the Facility treatment works,
including but not limited to interference as defined in 40 CFR section
403.3(k), pass through of pollutants as defined in 40 CFR section 403.3(p),
or acute worker health and safety problems or other problems as defined in
40 CFR section 403.5(b); and
(5) describes of the steps taken or planned by the Discharger and/or the
government of Mexico to reduce, eliminate, and prevent the reoccurrence of
noncompliance with influent limitations or any actual or potential adverse
effect(s) attributable to the influent on the Facility treatment works.
The presentation may be combined with the technical presentation required in
section VI.C.2.b.v of this Order. With each presentation, the Discharger shall
also prepare a one-page information sheet which highlights any challenges
associated with the Facility influent.
a)

The Discharger shall meet with CILA each quarter to share the approved
presentations and one-page information sheets and answer any questions
about its content. If there are (1) no influent limitation exceedances; and (2)
no instances of any actual or potential adverse effect(s) attributable to the
influent on the Facility treatment works, including, but not limited to,
interference as defined in 40 CFR section 403.3(k), pass through of
pollutants as defined in 40 CFR section 403.3(p), or acute worker health
and safety problems or other problems as defined in 40 CFR section
403.5(b), during any given quarter, the Discharger is not required to
prepare a technical presentation or information sheet for that quarter. If
there is no technical presentation or information sheet for that quarter, the
Discharger is not required to meet with CILA for that quarter.

b)

The Discharger shall request in writing that CILA share the approved
presentations at venues hosted by the regulated community at least once, if
appropriate venues are available. If CILA refuses or fails to confirm within
one month, the Discharger shall communicate the same to the San Diego
Water Board in writing in a timely manner.

c)

The Discharger shall request in writing that CILA share the approved
presentations with SPA and CESPT. If CILA refuses or does not confirm
within one month, the Discharger shall communicate the same to the San
Diego Water Board in writing in a timely manner.

d)

The Discharger shall request in writing that CILA provide the approved onepage information sheets to SPA and CESPT for inclusion in billing for
industrial customers. If CILA refuses or does not confirm within one month,
the Discharger shall communicate the same to the San Diego Water Board
in writing in a timely manner.

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064

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

e)

If there is an exceedance of allocated loadings for a given constituent
during a quarter, the Discharger shall request in writing that CILA host a
pretreatment workshop focused on the associated contaminant(s) within 60
days following the calendar month in which the exceedance occurred. If
needed, a minimum of one workshop will be hosted per year. If CILA
refuses to cooperate or does not confirm, the Discharger shall
communicate the same to the San Diego Water Board in writing in a timely
manner.

f)

The presentations and one-page information sheets shall follow the
schedule below, unless the Discharger is otherwise directed in writing by
the San Diego Water Board:

Table 8. Sharing Pretreatment Information with Mexico
Quarterly
Presentation and
Information Sheet
Period1
January 1 through
March 31
April 1 through June
30
July 1 through
September 30
October 1 through
December 31
1

Presentations and
Information Sheets
Due to the San Diego
Water Board
May 15

Discharger
Share with
Presentations
and Information
Sheets with
CILA
June 1

Discharger
Request for CILA
to Share
Presentations
and Information
Sheets
June 15

August 15

September 1

September 15

November 15

December 1

December 15

February 15

March 1

March 15

If there are( 1) no influent limitation exceedances; and (2) no instances of any actual or potential adverse effect(s)
attributable to the influent on the Facility treatment works, including, but not limited to, interference as defined in 40
CFR section 403.3(k), pass through of pollutants as defined in 40 CFR section 403.3(p) , or acute worker health and
safety problems or other problems as defined in 40 CFR section 403.5(b), during any given quarter, the Discharger is
not required to prepare a technical presentation or information sheet for that quarter. If there is no technical
presentation or information sheet for that quarter, the Discharger is not required to meet with CILA for that quarter.

v. The Discharger may, for reasons of international protocol, submit the agenda,
meeting summary, monthly SMR, technical presentation, one-page information
sheet, and other documents described in section VI.C.5.b to CILA in English. If
the documents are submitted in English, the Discharger shall request in writing
that CILA translate the documents into Spanish prior to distribution to the
stakeholders in Mexico. If CILA does not translate the documents as requested,
the Discharger shall do the translation.
c.

Pretreatment Conditions for the Discharger
The Discharger shall take the following measures to achieve the influent limitations
contained in section VI.C.5.b and compliance with pretreatment program
requirements within the communities that contribute wastewater to the Facility.
i.

Consistent with the Treaty for the Utilization of Waters of the Colorado and
Tijuana Rivers and of the Rio Grande (Treaty of 1944) and IBWC Minute No.
283, the Discharger shall work with CILA to take all appropriate actions to

LIMITATIONS AND DISCHARGE REQUIREMENTS

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065

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

prevent the discharge of untreated industrial wastewater into the Tijuana
sewage collection system which would in turn discharge into the Facility. In
particular, the Discharger shall work with CILA to encourage and enhance the
ability of CILA, SPA, SDUE, and/or CESPT to prevent the introduction of
pollutants into the Tijuana sewage collection system that a) inhibit or disrupt the
Facility, its treatment processes or operations, or its sludge processes, use, or
disposal; or b) pass through the Facility in quantities or concentrations that
cause or contribute to an exceedance of an applicable water quality standard in
the receiving water.
ii. The Discharger shall monitor and limit the pollutants in the influent from Mexico
to the Facility and report the monitoring results as specified in Attachment E of
this Order.
iii. The Discharger shall work with CILA to
a)

Improve communication between CILA, SPA, SDUE and CESPT with
respect to influent quality and effluent quality at the Facility;

b)

Provide training to SPA, SDUE, and CESPT and the business community in
Tijuana, Mexico regarding pretreatment requirements and the impacts of
influent limitation exceedances;

c)

Provide funding, if available, and/or assistance to SPA, SDUE, and CESPT
to improve monitoring capabilities, to improve laboratory analytical
capabilities (including lab certification for the Tijuana water quality
laboratory), and to assist in providing educational programs to the regulated
community.

iv. Annually, the Discharger shall request in writing from CILA the information listed
below for the previous calendar year. If CILA refuses or fails to provide this
information by March 1, the Discharger shall communicate the same to the San
Diego Water Board in writing in a timely manner.
a)

A brief description of any programs CILA (and/or other agencies)
implements to reduce pollutants from non-domestic users that are not
classified as Significant Industrial Users (SIUs) (a non-domestic user would
be any commercial or industrial user);

b)

A brief description of the development and implementation of any local
limits and enforcement programs.

c)

A brief description of any significant changes in operating the pretreatment
program which differ from the previous year including, but not limited to,
changes concerning the program’s administrative structure, local limits,
monitoring program or monitoring frequencies, legal authority, enforcement
policy, funding levels, or staffing levels;

d)

A summary of the annual pretreatment budget, including the cost of
pretreatment program functions and equipment purchases;

LIMITATIONS AND DISCHARGE REQUIREMENTS

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066

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

e)

A summary of all activities undertaken to involve and inform the public of
the pretreatment program and pretreatment requirements including a copy
of any notices provided;

f)

A list of the industries that could discharge to the Facility including the
name, location, activity, type of waste, applicable local limits (if any), and
any enforcement activities (if any); and

g)

Industrial and/or wastewater collection system monitoring in Tijuana
conducted by CILA, CESPT, SPA, SDUE, and/or CESPT.

v. By March 31 of each year, the Discharger shall submit an annual report to
USEPA Region 9 and the San Diego Water Board for the previous calendar
year. The report shall contain the following:
a)

A discussion of upset, interference, or pass through incidents at the Facility,
if any, which the Discharger knows or suspects were caused by the influent
to the Facility;

b)

Influent limitation exceedances, if any;

c)

A discussion of any coordination with CILA to determine the reasons why
the incidents above occurred and any corrective actions (if applicable);

d)

A description of all activities undertaken during the previous calendar year
working with CILA and any other entities in Mexico to address any upset,
interference, or pass through incidents described in section VI.C.5.d.v.a), to
address any influent limitation exceedances, and to meet the requirements
in section VI.C.5.d.iii;

e)

A description of any changes in sludge disposal methods;

f)

A description of any significant changes in the influent limitations or
implementation plan;

g)

A discussion of any concerns not described elsewhere in this report.

h)

The annual report provided by CILA as per section VI.C.5.d.iv, if any; and

i)

A copy of the agenda and meeting summary required in section VI.C.5.c.i;
the notification required in section VI.C.5.c.ii (if any); and the written
requests to CILA required in sections VI.C.5.c.iii.b), VI.C.5.c.iii.c),
VI.C.5.c.iii.d), VI.C.5.c.iii.e), and VI.C.5.c.iv.

LIMITATIONS AND DISCHARGE REQUIREMENTS

PAGE 39

067

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

The Discharger shall submit this annual report to the USEPA Region 9 and San
Diego Water Board at the following addresses:
USEPA Region 9
Pretreatment Coordinator
75 Hawthorne Street
San Francisco, CA 94105

California Regional Water Quality
Control Board, San Diego Region
Pretreatment Coordinator
2375 Northside Drive
San Diego, CA 92108

If either agency relocates its offices, the annual report shall be submitted to the
new office address provided by the San Diego Water Board.
vi. If, after one year of the effective date of this permit, the requirements in this
Order are not sufficient to achieve the goals described in section VI.C.5.d.i, the
Discharger shall submit a proposal for additional action(s) that will be taken to
achieve these goals, and the permit may be amended to incorporate the
proposed actions. The proposal must be received by the San Diego Water
Board by 18 months after the effective date of this permit.
d.

Sludge (Biosolids) Requirements4
i.

The handling, treatment, use, management, and disposal of sludge and solids
derived from wastewater treatment must comply with applicable provisions of
section 405 of the CWA and USEPA regulations at 40 CFR parts 257, 258, 501,
and 503, including all monitoring, record keeping, and reporting requirements.

ii. The discharge of sludge from the Facility in the United States or at a location
where the sludge or sludge constituents could be conveyed to the United States
by surface or ground water is prohibited.
iii. All sludge generated at the Facility shall be removed from the Facility within 6
months of being generated. Any site in the United States where sludge
generated by the Discharger is stored for more than two years will be classified
by USEPA as a surface disposal site pursuant to 40 CFR part 503 Subpart C.
The Discharger must ensure that the USEPA receives from the operator of any
such surface disposal site, the notification required in 40 CFR section 122.21,
180 days before the site becomes a surface disposal site. The Discharger must
also ensure that the site operator begins complying fully with the requirements in
40 CFR part 503 Subpart C for surface disposal sites at the two-year start date.
If the Discharger wants to store sludge for over two years, or allow a contractor
to store sludge for over two years, the Discharger must submit the information in
40 CFR section 503.20(b) to USEPA in writing. The notification must be
received by the USEPA 180 days prior to the date at which the site becomes a
surface disposal site.
iv. All requirements of 40 CFR part 503 and title 23, division 3, chapter 15 of the
CCR are enforceable whether or not the requirements of those regulations are
stated in an NPDES permit or any other permit issued to the Discharger.

4

See Attachment A for definitions of abbreviations and a glossary of common terms used in this Order.

LIMITATIONS AND DISCHARGE REQUIREMENTS

PAGE 40

068

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

v. The Discharger shall take all reasonable steps to prevent and minimize any
solids and sludge treatment, storage, and transfer in violation of this Order that
has a likelihood of adversely affecting human health or the environment in the
United States.
vi. Solids and sludge treatment, storage, and transfer shall not create a nuisance,
such as objectionable odors or flies, and shall not result in groundwater
contamination in the United States. The Discharger shall use a tarp to cover the
sludge during any storage or during transportation to the international border.
vii. The solids and sludge treatment and storage site in the United States shall have
adequate facilities to divert surface water runoff from adjacent areas to protect
the boundaries of the site from erosion, and to prevent drainage from the
treatment and storage site. Adequate protection is defined as protection, at the
minimum, from a 100-year 24-hour storm event, 100-year peak stream flows as
defined by the San Diego County Flood Control Agency, and protection from the
highest possible tidal stage that may occur.
viii. The Discharger shall develop a Sludge Spill Prevention and Response Plan.
ix. In the event that the Government of Mexico is unable to truck the processed
sludge and solids to Mexico for disposal, the Discharger shall develop a Sludge
and Solids Contingency Plan to dispose of, or temporarily store, the processed
sludge and solids in the United States. Any disposal site or temporary storage
site identified in the Sludge and Solids Contingency Plan shall comply with
applicable provisions of section 405 of the CWA and USEPA regulations at 40
CFR parts 257, 258, 501, and 503, including all monitoring, record keeping, and
reporting requirements. The Discharger shall submit the Sludge and Solids
Contingency Plan to the San Diego Water Board and USEPA, no later than 180
days after the adoption of this Order.
x. Monitoring Requirements
a)

The sludge shall be tested for all priority pollutants as specified in 40 CFR
section 131.38 and for Total Threshold Limit Concentration/ Soluble
Threshold Limits Concentrations (TTLC/STLC) constituents. This testing
shall be done at a frequency dependent on the nature and effect of the
sludge storage or disposal practices and at a minimum shall be as required
by 40 CFR part 503.

b)

If the sludge is stored in the United States for more than 24 hours, the
sludge shall be sampled and tested for pH to ensure that the pH remains
between 12 and 12.5 for the first two hours and greater than 11.5 for an
additional 22 hours.

c)

The Discharger shall develop a sampling plan for collection of
representative samples for monitoring pollutants and constituents described
in subsection a) above. The plan should include number and location of
sampling points.

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U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

d)

Samples of sludge shall be collected according to the procedures for
compositing samples outlined in Test Methods for Evaluating Solid Waste
Physical/Chemical Methods (EPA Publication SW-846, Second Edition, as
updated). Samples shall be split, and a portion of the sample preserved, in
the event that the results show concentrations of waste constituents that
exceed 10 times the STLC listed in title 22 CCR.

e)

Results of analyses shall be reported in mg/kg, wet weight and 100 percent
dry weight. If the results indicate that the total concentration of any waste
constituent is greater than 10 times the STLC value for the constituent
listed in title 22 CCR, then the Discharger shall also perform a Waste
Extraction Test on the sludge sample pursuant to title 22 CCR
requirements.

xi. Reporting Requirements. The Discharger shall submit an annual report to
USEPA and the San Diego Water Board by March 30 of each year for the period
from January 1 through December 31 of the preceding year. The report shall
include:
a)
b)

Certification that all sludge was transferred to Mexico and no sludge was
stored for more than 6 months in the United States or permanently
disposed of in the United States;

c)

A description or certification of the ultimate destination of the sludge in
Mexico to the best of the Discharger's knowledge; and

d)
e.

Amount of sludge generated that year at the Facility, in dry metric tons, and
amount of sludge leaving the Facility;

Results of all monitoring required in Sludge (Biosolids) Requirements,
section VI.C.5.d.x of this Order.

Requirements for Receipt of Anaerobically Digestible Material
If the Discharger proposes to receive hauled-in anaerobically digestible material for
injection into an anaerobic digester, the Discharger shall notify the San Diego Water
Board and develop and implement standard operating procedures (SOPs) for this
activity. If hauled-in waste for digestion is already ongoing, the SOPs shall be
developed within 90 days. Otherwise, the SOPs shall be developed prior to initiation
of the hauling. The SOPs shall address material handling, including unloading,
screening, or other processing prior to anaerobic digestion; transportation; spill
prevention; and spill response. In addition, the SOPs shall address avoidance of the
introduction of materials that could cause interference, pass-through, or upset of the
treatment processes; avoidance of prohibited material; vector control; odor control;
operation and maintenance; and the disposition of any solid waste segregated from
introduction to the digester. The Discharger shall provide training to its staff on the
SOPs and shall maintain records for a minimum of three years for each load
received, describing the hauler, waste type, and quantity received. In addition, the
Discharger shall maintain records for a minimum of three years for the disposition,
location, and quantity of cumulative pre-digestion-segregated solid waste hauled offsite.

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070

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

6.

Other Special Provisions - Responsibilities, Liabilities, Legal Action, Penalties –
Not Applicable

7.

Compliance Schedules – Not Applicable

VII. COMPLIANCE DETERMINATION
Compliance with the effluent limitations contained in section IV of this Order will be determined as
specified below:

A. Compliance with Average Monthly Effluent Limitation
If the average of daily discharges over a calendar month exceeds the average monthly
effluent limitation (AMEL) for a given parameter, an alleged violation will be flagged and the
Discharger will be considered out of compliance for each day of that month for that parameter
(e.g., resulting in 31 days of noncompliance in a 31-day month). The average of daily
discharges over the calendar month that exceeds the AMEL for a parameter will be
considered out of compliance for the month only. If only a single sample is taken during the
calendar month and the analytical result for that sample exceeds the AMEL, the Discharger
will be considered out of compliance for that calendar month. For any one calendar month
during which no sample (daily discharge) is taken, no compliance determination can be made
for that calendar month.

B. Compliance with Average Weekly Effluent Limitation
If the average of daily discharges over a calendar week (Sunday through Saturday) exceeds
the average weekly effluent limitation (AWEL) for a given parameter, an alleged violation will
be flagged and the Discharger will be considered out of compliance for each day of that week
for that parameter, resulting in 7 days of noncompliance. The average of daily discharges
over the calendar week that exceeds the AWEL for a parameter will be considered out of
compliance for that week only. If only a single sample is taken during the calendar week and
the analytical result for that sample exceeds the AWEL, the Discharger will be considered out
of compliance for that calendar week. For any one calendar week during which no sample
(daily discharge) is taken, no compliance determination can be made for that calendar week.

C. Compliance with Maximum Daily Effluent Limitation
The maximum daily effluent limitation (MDEL) shall apply to flow weighted 24-hour composite
samples, or grab samples, as specified in the MRP (Attachment E). If a daily discharge
exceeds the MDEL for a given parameter, an alleged violation will be flagged and the
Discharger will be considered out of compliance for that parameter for that one day only
within the reporting period. For any one day during which no sample is taken, no compliance
determination can be made for that day.

D. Compliance with Instantaneous Minimum Effluent Limitation
The instantaneous minimum effluent concentration limitation shall apply to grab sample
analytical results. If the analytical result of a single grab sample is lower than the
instantaneous minimum effluent limitation for a parameter, a violation will be flagged and the
Discharger will be considered out of compliance for that parameter for that single sample.
Non-compliance for each sample will be considered separately (e.g., the results of two grab
samples taken within a calendar day that are both lower than the instantaneous minimum
effluent limitation would result in two instances of noncompliance with the instantaneous
minimum effluent limitation.)

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071

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

E. Compliance with Instantaneous Maximum Effluent Limitation
The instantaneous maximum effluent concentration limitation shall apply to grab sample
determinations. If the analytical result of a single grab sample is higher than the
instantaneous maximum effluent limitation for a parameter, a violation will be flagged and the
Discharger will be considered out of compliance for that parameter for that single sample.
Non-compliance for each sample will be considered separately (e.g., the results of two grab
samples taken within a calendar day that both exceed the instantaneous maximum effluent
limitation would result in two instances of noncompliance with the instantaneous maximum
effluent limitation).

F.

Compliance with 6-Month Median Effluent Limitation
If the median concentration of daily discharges over any 180-day period exceeds the 6-month
median effluent limitation for a given parameter, an alleged violation will be flagged and the
Discharger will be considered out of compliance for each day of that 180-day period for that
parameter. The next assessment of compliance will occur after the next sample is taken. If
only a single sample is taken during a given 180-day period and the analytical result for that
sample exceeds the 6-month median, the Discharger will be considered out of compliance for
the 180-day period. For any 180-day period during which no sample is taken, no compliance
determination can be made for the 6-month median limitation.

G. Compliance with 30-Day Average Effluent Limitation
If the arithmetic mean of daily discharges over any thirty consecutive day period exceeds the
30-day average effluent limitation, an alleged violation will be flagged and the Discharger will
be considered out of compliance for each day of that 30-day period for that parameter. The
next assessment of compliance will occur after the next sample is taken. If only a single
sample is taken during a given 30-day period and the analytical result for that sample
exceeds the 30-day average effluent limitation, the Discharger will be considered out of
compliance for the 30-day period. For any 30-day period during which no sample is taken, no
compliance determination can be made for the 30-day average effluent limitation.

H. Mass and Concentration Limitations
Compliance with mass and concentration effluent limitations for the same parameter shall be
determined separately with their respective limitations. When the concentration of a
constituent in an effluent sample is determined to be “Not Detected” (ND) or “Detectable but
not quantifiable” (DNQ), the corresponding mass emission rate (MER) determined from that
sample concentration shall also be reported as “ND” or “DNQ”.

I.

Percent Removal
Compliance with percent removal requirements for average monthly percent removal of
BOD5 and TSS shall be determined separately for each wastewater treatment facility
discharging through an outfall. For each wastewater treatment facility, the monthly average
percent removal is the average of the calculated daily discharge percent removals only for
days on which the constituent concentration is monitored in both the influent and effluent of
the wastewater treatment facility at the locations specified in the MRP (Attachment E) within a
calendar month.
The percent removal for each day shall be calculated according to the following equation:
Influent concentrat ion  Effluent concentrat ion
 100%
Influent concentrat ion
Daily discharge percent removal =

LIMITATIONS AND DISCHARGE REQUIREMENTS

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072

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

J.

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Ocean Plan Provisions for Table 1 Parameters
Sufficient sampling and analysis shall be required to determine compliance with the effluent
limitations.
1.

Compliance with Single-constituent Effluent Limitations
The Discharger shall be deemed out of compliance with an effluent limitation or
discharge specification if the concentration of the constituent in the monitoring sample is
greater than the effluent limitation or discharge specification and greater than or equal to
the Minimum Level (ML).

2.

Compliance with Effluent Limitations Expressed as a Sum of Several Parameters
The Discharger is out of compliance with an effluent limitation that applies to the sum of
a group of chemicals (e.g., PCBs) if the sum of the individual pollutant concentrations is
greater than the effluent limitation. Individual pollutants of the group will be considered to
have a concentration of zero if the constituent is reported as ND or DNQ.

3.

Multiple Sample Data Reduction
The concentration of the pollutant in the effluent may be estimated from the result of a
single sample analysis or by a measure of central tendency (arithmetic mean, geometric
mean, median, etc.) of multiple sample analyses when all sample results are quantifiable
(i.e., greater than or equal to the reported ML). When one or more sample results are
reported as ND or DNQ, the central tendency concentration of the pollutant shall be the
median (middle) value of the multiple samples. If, in an even number of samples, one or
both of the middle values is ND or DNQ, the median will be the lower of the two middle
values.

4.

Mass Emission Rate (MER)
The MER, in pounds per day, shall be obtained from the following calculation for any
calendar day:
Mass Emission Rate (lbs/day) = 8.34 x Q x C
In which Q and C are the flow rate in million gallons per day and the constituent
concentration in mg/L, respectively, and 8.34 is a conversion factor (lbs/gallon of water).
If a composite sample is taken, then C is the concentration measured in the composite
sample and Q is the average flow rate occurring during the period over which the
samples are composited.

K. Bacteriological Standards and Analysis
1.

The geometric mean used for determining compliance with bacteriological standards is
calculated with the following equation:
Geometric Mean = (C1 x C2 x … x Cn)1/n
Where n is the number of days samples were collected during the period and C is the
density of bacteria (colony forming units (CFU)/100 mL) found on each day of sampling.

2.

For all bacterial analyses, sample dilutions should be performed so the range of values
extends from 2 to 16,000 CFU. The detection methods used for each analysis shall be
reported with the results of the analysis. Detection methods used for coliforms (total and
fecal) shall be those listed in 40 CFR part 136 or any improved method determined by
the San Diego Water Board (and approved by USEPA) to be appropriate. Detection
methods used for enterococcus shall be those presented in USEPA publication USEPA

LIMITATIONS AND DISCHARGE REQUIREMENTS

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073

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

600/4-85/076, Test Methods for Escherichia coli and Enterococci in Water by Membrane
Filter Procedure, listed under 40 CFR part 136, and any other method approved by the
San Diego Water Board.

L.

Single Operational Upset
A single operational upset (SOU) that leads to simultaneous violations or more than one
pollutant parameter shall be treated as a single violation, and limits the Discharger’s liability in
accordance with the following conditions:
1.

A SOU is broadly defined as a single unusual event that temporarily disrupts the usually
satisfactory operation of a system in such a way that it results in violation of multiple
pollutant parameters.

2.

The Discharger may assert SOU to limit liability only for those violations which the
Discharger submitted notice of the upset as required in section I.H of Attachment D.

3.

For purposes outside of Water Code sections 13385(h) and (i), determination of
compliance and civil liability (including any more specific definition of SOU), the
requirements for the Discharger to assert the SOU limitation of liability, and the manner
of counting violations, shall be in accordance with the USEPA Memorandum “Issuance
of Guidance Interpreting Single Operational Upset” (September 27, 1989).

4.

For purposes of Water Code sections 13385(h) and (i), determination of compliance and
civil liability (including any more specific definition of SOU), the requirements for the
Discharger to assert the SOU limitation of liability, and the manner of counting violations
shall be in accordance with Water Code section 13385(f)(2).

M. Chronic Toxicity
Chronic toxicity is used to measure the acceptability of waters for supporting a healthy marine
biota until approved methods are developed to evaluate biological response. Compliance with
the chronic toxicity effluent limitation, established in section IV.A.1 of this Order for Discharge
Point No. 001, shall be determined using critical life stage toxicity tests in accordance with
procedures prescribed by the Ocean Plan and restated in the MRP (Attachment E). Chronic
toxicity shall be expressed as Toxic Units Chronic (TUc), where:
TUc = 100 / NOEL
NOEL is the No Observed Effect Level and is expressed as the maximum percent of effluent
that causes no observable effect on a test organism, as determined by the result of a critical
life stage toxicity test.

N. Acute Toxicity
Acute toxicity is used to measure the acceptability of waters for supporting a healthy marine
biota until approved methods are developed to evaluate biological response. Compliance with
the acute toxicity effluent limitation established in section IV.A.1 of this Order for Discharge
Point No. 001 shall be determined using the following formula:
TUa (Toxic Units Acute) = 100 / 96-hr LC 50
where LC 50 (percent waste giving 50 percent survival of test organisms) shall be determined
by static or continuous flow bioassay techniques using standard marine test species as
specified in Appendix III of the Ocean Plan. If specific identifiable substances in wastewater
can be demonstrated by the Discharger to be rapidly rendered harmless upon discharge to
the marine environment, but not as a result of dilution, the LC 50 may be determined after the
test samples are adjusted to remove the influence of those substances.
LIMITATIONS AND DISCHARGE REQUIREMENTS

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074

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

When the Discharger cannot measure the 96-hour LC 50 due to greater than 50 percent
survival of the test species in 100 percent waste, the toxicity concentration shall be calculated
by the expression:
TUa = (log[100 – S])/1.7
where S is the percent survival in 100 percent waste. If S is greater than 99, TUa shall be
reported as zero.

LIMITATIONS AND DISCHARGE REQUIREMENTS

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075

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

ATTACHMENT A – Abbreviations and Glossary
Part 1. – Abbreviations
Abbreviation
AMEL
ASBS
AWEL
Basin Plan
Cal OES
CBOD5
CCR
CESPT
CFR
CFU
CILA
CONAGUA
CWA
DEH
DDT
Dm
DNQ
GPS
HCH
IBWC
IWTP
μg
μg/L
lbs/day
LC
LC 50
mg/L
ml/L
MDEL
MDL
MGD
ML
MPN
MRP
MS4
ND
NR
NTU
NPDES
NOEL

Definition
Average Monthly Effluent Limitation
Areas of Special Biological Significance
Average Weekly Effluent Limitation
Water Quality Control Plan for the San Diego Basin
California Office of Emergency Services
Carbonaceous Biochemical Oxygen Demand (5-Day at 20oC)
California Code of Regulations
Comisión Estatal de Servicios Públicos de Tijuana
(or equivalent agency)
Code of Federal Regulations
Colony Forming Units
Comision Internacional de Límites y Aguas,
Mexican Section of the International Boundary and Water Commission
Comisión Nacional del Agua
(or equivalent agency)
Clean Water Act
County of San Diego Department of Environmental Health
Dichlorodiphenyltrichloroethane
Initial Dilution
Detected, but Not Quantified
Global Positioning System
Hexachlorocyclohexane
International Boundary and Water Commission
International Wastewater Treatment Plant
Microgram
Micrograms per Liter
Pounds per Day
Lethal Concentration
Percent Waste Giving 50 Percent Survival of Test Organisms
Milligrams per Liter
Milliliters per Liter
Maximum Daily Effluent Limitation
Method Detection Limit
Million Gallons per Day
Minimal Level
Most Probable Number
Monitoring and Reporting Program
Municipal Separate Storm Sewer System
Not Detected
Not Reported
Nephelometric Turbidity Unit
National Pollutant Discharge Elimination System
No Observed Effect Level

ATTACHMENT A – DEFINITIONS

076

A-1

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Abbreviation
Ocean Plan
PAH
PCB
PMP
Prevention/Response
Plan
PROFEPA
RL
RPA
SABWWTP
San Diego Water Board
SBLO
SBOO
SBWRP
SCCWRP
SDUE
SPA
State Water Board
STLC
TIE
TMDL
TRE
TSS
TTLC
TUa
TUc
USEPA
USIBWC
U.S.
WERL
WET
ZID

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Definition
California Ocean Plan, Water Quality Control Plan Ocean Waters Of
California
Polynuclear Aromatic Hydrocarbons
Polychlorinated Biphenyls
Pollutant Minimization Program
Spill and Transboundary Wastewater Flow Prevention and Response
Plan
Procuraduría Federal de Protección al Ambiente
(or equivalent agency)
Reporting Level
Reasonable Potential Analysis
San Antonio de los Buenos Wastewater Treatment Plant
California Regional Water Quality Control Board, San Diego Region
South Bay Land Outfall
South Bay Ocean Outfall
South Bay Water Reclamation Plant
Southern California Coastal Waters Research Project
City of Tijuana’s Secretaría de Desarrollo Urbano y Ecología
(or equivalent agency)
Secretaría de Protección al Ambiente
(or equivalent agency)
State Water Resources Control Board
Soluble Threshold Limit Concentration
Toxicity Identification Evaluation
Total Maximum Daily Load
Toxicity Reduction Evaluation
Total Suspended Solids
Total Threshold Limit Concentration
Toxic Units Acute
Toxic Units Chronic
United Stated Environmental Protection Agency
United States Section of the
International Boundary and Water Commission
United States
USEPA Water Engineering Research Laboratory
Whole Effluent Toxicity
Zone of Initial Dilution

ATTACHMENT A – DEFINITIONS

077

A-2

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Part 2. – Glossary of Common Terms
30-day average
The arithmetic mean of pollutant parameter values of samples collected in a period of 30 consecutive
days.
Acute Toxicity
The ability of a substance to cause severe biological harm or death soon after a single exposure or
dose. The term acute toxicity also encompasses any poisonous effect resulting from a single short-term
exposure to a toxic substance. The Ocean Plan determines acute toxicity through the use of the
following equations.
a. Acute Toxicity (TUa)
Expressed in Toxic Units Acute (TUa)
TUa =

100
96-hr LC 50

where:
LC 50 = Lethal Concentration 50% (see below)
When the 96-hour LC 50 cannot be measured due to greater than 50 percent survival of the test
species in 100 percent waste, the toxicity concentration shall be calculated by the expression:
TUa =

log (100 - S)
1.7

where:
S = percentage survival in 100 percent waste. If S > 99, TUa shall be reported as zero.
b. Lethal Concentration 50% (LC 50)
LC 50 (percent waste giving 50 percent survival of test organisms) shall be determined by static or
continuous flow bioassay techniques using standard marine test species as specified in Appendix III
of the Ocean Plan. If specific identifiable substances in wastewater can be demonstrated by the
discharger as being rapidly rendered harmless upon discharge to the marine environment, but not
as a result of dilution, the LC 50 may be determined after the test samples are adjusted to remove
the influence of those substances.
Anaerobically Digestible Material
Inedible kitchen grease as defined in section 19216 of the Food and Agricultural Code and food
material as defined in Title 14, CCR, Division 7, Chapter 3.1, Article 1, Section 17582(a)(20).
Areas of Special Biological Significance (ASBS)
Those areas designated by the State Water Resources Control Board (State Water Board) as ocean
areas requiring protection of species or biological communities to the extent that alteration of natural
water quality is undesirable. All ASBS are also classified as a subset of STATE WATER QUALITY
PROTECTION AREAS.

ATTACHMENT A – DEFINITIONS

078

A-3

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Average Monthly Effluent Limitation (AMEL)
The highest allowable average of daily discharges over a calendar month, calculated as the sum of all
daily discharges measured during a calendar month divided by the number of daily discharges
measured during that month.
Average Weekly Effluent Limitation (AWEL)
The highest allowable average of daily discharges over a calendar week (Sunday through Saturday),
calculated as the sum of all daily discharges measured during a calendar week divided by the number
of daily discharges measured during that week.
Biosolids
Nutrient-rich organic materials resulting from the treatment of sewage sludge. When treated and
processed, sewage sludge becomes biosolids which can be safely recycled and applied as fertilizer to
sustainably improve and maintain productive soils and stimulate plant growth.
Bypass
The intentional diversion of waste streams from any portion of a treatment facility. (40 CFR Part
122.41(m)(1)(i).)
Chlordane
The sum of chlordane-alpha, chlordane-gamma, chlordene-alpha, chlordene-gamma, nonachlor-alpha,
nonachlor-gamma, and oxychlordane.
Chronic Toxicity
The capacity of a substance to cause long-term poisonous health effects in humans, animals, fish, and
other organisms. This parameter shall be used to measure the acceptability of waters for supporting a
healthy marine biota until improved methods are developed to evaluate biological response. The Ocean
Plan determines chronic toxicity through the use of the following equations.
a. Chronic Toxicity (TUc)
Expressed as Toxic Units Chronic (TUc)
TUc =

100
NOEL

b. No Observed Effect Level (NOEL)
The NOEL is expressed as the maximum percent effluent or receiving water that causes no
observable effect on a test organism, as determined by the result of a critical life stage toxicity test
listed in Ocean Plan Appendix II.
Chlorinated phenolic compounds
The sum of 4-chloro-3-methylphenol, 2-chlorophenol, pentachlorophenol, 2,4,5-trichlorophenol, and
2,4,6-trichlorophenol.

ATTACHMENT A – DEFINITIONS

079

A-4

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Daily Discharge
Daily Discharge is defined as either: (1) the total mass of the constituent discharged over the calendar
day (12:00 am through 11:59 pm) or any 24-hour period that reasonably represents a calendar day for
purposes of sampling (as specified in the permit), for a constituent with limitations expressed in units of
mass or; (2) the unweighted arithmetic mean measurement of the constituent over the day for a
constituent with limitations expressed in other units of measurement (e.g., concentration).
The daily discharge may be determined by the analytical results of a composite sample taken over the
course of one day (a calendar day or other 24-hour period defined as a day) or by the arithmetic mean
of analytical results from one or more grab samples taken over the course of the day.
For composite sampling, if 1 day is defined as a 24-hour period other than a calendar day, the
analytical result for the 24-hour period will be considered as the result for the calendar day in which the
24-hour period ends.
DDT
The sum of 4,4’DDT, 2,4’DDT, 4,4’DDE, 2,4’DDE, 4,4’DDD, and 2,4’DDD.
Degrade
Degradation shall be determined by comparison of the waste field and reference site(s) for
characteristic species diversity, population density, contamination, growth anomalies, debility, or
supplanting of normal species by undesirable plant and animal species. Degradation occurs if there are
significant differences in any of three major biotic groups, namely, demersal fish, benthic invertebrates,
or attached algae. Other groups may be evaluated where benthic species are not affected, or are not
the only ones affected.
Detected, but Not Quantified (DNQ)
Sample results that are less than the reported Minimum Level, but greater than or equal to the
laboratory’s MDL. Sample results reported as DNQ are estimated concentrations.
Dichlorobenzenes
The sum of 1,2- and 1,3-dichlorobenzene.
Downstream Ocean Waters
Waters downstream with respect to ocean currents.
Dredged Material
Any material excavated or dredged from the navigable waters of the United States, including material
otherwise referred to as “spoil.”
Dry Weather
Weather is considered dry if the preceding 72 hours have been without precipitation greater than 0.1
inch (>0.1 inch), based on the Goat Canyon Pump Station rain gauge.
Enclosed Bays
Indentations along the coast that enclose an area of oceanic water within distinct headlands or harbor
works. Enclosed bays include all bays where the narrowest distance between headlands or outermost
harbor works is less than 75 percent of the greatest dimension of the enclosed portion of the bay. This
definition includes but is not limited to: Humboldt Bay, Bodega Harbor, Tomales Bay, Drakes Estero,
San Francisco Bay, Morro Bay, Los Angeles Harbor, Upper and Lower Newport Bay, Mission Bay, and
San Diego Bay.
ATTACHMENT A – DEFINITIONS

080

A-5

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Endosulfan
The sum of endosulfan-alpha and -beta and endosulfan sulfate.
Estuaries and Coastal Lagoons
Estuaries and Coastal Lagoons are waters at the mouths of streams that serve as mixing zones for
fresh and ocean waters during a major portion of the year. Mouths of streams that are temporarily
separated from the ocean by sandbars shall be considered as estuaries. Estuarine waters will generally
be considered to extend from a bay or the open ocean to the upstream limit of tidal action but may be
considered to extend seaward if significant mixing of fresh and salt water occurs in the open coastal
waters. The waters described by this definition include but are not limited to the Sacramento-San
Joaquin Delta as defined by of Water Code section 12220, Suisun Bay, Carquinez Strait downstream to
Carquinez Bridge, and appropriate areas of the Smith, Klamath, Mad, Eel, Noyo, and Russian Rivers.
Facility
South Bay International Wastewater Treatment Plant.
Facilities
South Bay International Wastewater Treatment Plant, five canyon collectors, two pump stations, the
South Bay Land Outfall (SBLO), the South Bay Ocean Outfall (SBOO), and other associated
infrastructure
Halomethanes
The sum of bromoform, bromomethane (methyl bromide) and chloromethane (methyl chloride).
HCH
The sum of the alpha, beta, gamma (lindane) and delta isomers of hexachlorocyclohexane.
Initial Dilution (Dm)
The process that results in the rapid and irreversible turbulent mixing of wastewater with ocean water
around the point of discharge.
For a submerged buoyant discharge, characteristic of most municipal and industrial wastes that are
released from the submarine outfalls, the momentum of the discharge and its initial buoyancy act
together to produce turbulent mixing. Initial dilution in this case is completed when the diluting
wastewater ceases to rise in the water column and first begins to spread horizontally.
For shallow water submerged discharges, surface discharges, and non-buoyant discharges,
characteristic of cooling water wastes and some individual discharges, turbulent mixing results primarily
from the momentum of discharge. Initial dilution, in these cases, is considered to be completed when
the momentum induced velocity of the discharge ceases to produce significant mixing of the waste, or
the diluting plume reaches a fixed distance from the discharge to be specified by the San Diego Water
Board, whichever results in the lower estimate for initial dilution.
Instantaneous Maximum Effluent Limitation
The highest allowable value for any single grab sample or aliquot (i.e., each grab sample or aliquot is
independently compared to the instantaneous maximum limitation).
Instantaneous Minimum Effluent Limitation
The lowest allowable value for any single grab sample or aliquot (i.e., each grab sample or aliquot is
independently compared to the instantaneous minimum limitation).

ATTACHMENT A – DEFINITIONS

081

A-6

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Interference
A discharge which, alone or in conjunction with a discharge or discharges from other sources, both:
(1) Inhibits or disrupts the POTW, its treatment processes or operations, or its sludge processes, use or
disposal; and
(2) Therefore is a cause of a violation of any requirement of the POTW's NPDES permit (including an
increase in the magnitude or duration of a violation) or of the prevention of sewage sludge use or
disposal in compliance with the following statutory provisions and regulations or permits issued
thereunder (or more stringent State or local regulations): Section 405 of the Clean Water Act, the Solid
Waste Disposal Act (SWDA) (including title II, more commonly referred to as the Resource
Conservation and Recovery Act (RCRA), and including State regulations contained in any State sludge
management plan prepared pursuant to subtitle D of the SWDA), the Clean Air Act, the Toxic
Substances Control Act, and the Marine Protection, Research and Sanctuaries Act.
Kelp Beds
For purposes of the bacteriological standards of the Ocean Plan, kelp beds are significant aggregations
of marine algae of the genera Macrocystis and Nereocystis. Kelp beds include the total foliage canopy
of Macrocystis and Nereocystis plants throughout the water column.
Litter
Encompasses all improperly discarded waste material, including, but not limited to convenience food,
beverage, and other product packages, or containers constructed of steel, aluminum, glass, paper,
plastic, and other natural and synthetic materials, thrown or deposited on the lands and waters of the
State.
Mariculture
The culture of plants and animals in marine waters independent of any pollution source.
Material
(a) In common usage: (1) the substance or substances of which a thing is made or composed (2)
substantial; (b) For purposes of the Ocean Plan relating to waste disposal, dredging and the disposal of
dredged material and fill, MATERIAL means matter of any kind or description which is subject to
regulation as waste, or any material dredged from the navigable waters of the United States. See also,
DREDGED MATERIAL.
Maximum Daily Effluent Limitation (MDEL)
The highest allowable daily discharge of a pollutant.
Method Detection Limit (MDL)
The minimum concentration of a substance that can be measured and reported with 99 percent
confidence that the analyte concentration is greater than zero, as defined in 40 CFR part 136,
Attachment B.
Minimum Level (ML)
The concentration at which the entire analytical system must give a recognizable signal and acceptable
calibration point. The ML is the concentration in a sample that is equivalent to the concentration of the
lowest calibration standard analyzed by a specific analytical procedure, assuming that all the method
specified sample weights, volumes, and processing steps have been followed.

ATTACHMENT A – DEFINITIONS

082

A-7

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Natural Light
Reduction of natural light may be determined by the San Diego Water Board by measurement of light
transmissivity or total irradiance, or both, according to the monitoring needs of the San Diego Water
Board.
Not Detected (ND)
Those sample results less than the laboratory’s MDL.
Ocean Waters
The territorial marine waters of the state as defined by California law to the extent these waters are
outside of enclosed bays, estuaries, and coastal lagoons. If a discharge outside the territorial waters of
the state could affect the quality of the waters of the state, the discharge may be regulated to assure no
violation of the Ocean Plan will occur in ocean waters.
Pass Through
A discharge which exits the POTW into waters of the United States in quantities or concentrations
which, alone or in conjunction with a discharge or discharges from other sources, is a cause of a
violation of any requirement of the POTW's NPDES permit (including an increase in the magnitude or
duration of a violation.
Percent Removal
A percentage expression of the removal efficiency across a treatment plant for a given pollutant
parameter, as determined from the average values of the raw wastewater influent pollutant
concentrations to the facility and the average values of the effluent pollutant concentrations for a given
time period.
Polynuclear Aromatic Hydrocarbons (PAHs)
The sum of acenaphthylene, anthracene, 1,2-benzanthracene, 3,4-benzofluoranthene,
benzo[k]fluoranthene, 1,12-benzoperylene, benzo[a]pyrene, chrysene, dibenzo[ah]anthracene,
fluorene, indeno[1,2,3-cd]pyrene, phenanthrene and pyrene.
Polychlorinated Biphenyls (PCBs)
The sum of chlorinated biphenyls whose analytical characteristics resemble those of Aroclor-1016,
Aroclor-1221, Aroclor-1232, Aroclor-1242, Aroclor-1248, Aroclor-1254 and Aroclor-1260.
Phenolic Compounds (non-chlorinated)
The sum of 2,4-dimethylphenol, 4,6-Dinitro-2-methylphenol, 2,3-dinitrophenol, 2-methylphenol, 4methylphenol, 2-nitropheneol, 4-nitrophenol, and phenol.
Pollutant Minimization Program (PMP)
PMP means waste minimization and pollution prevention actions that include, but are not limited to,
product substitution, waste stream recycling, alternative waste management methods, and education of
the public and businesses. The goal of the PMP shall be to reduce all potential sources of Ocean Plan
Table 1 pollutants through pollutant minimization (control) strategies, including pollution prevention
measures as appropriate, to maintain the effluent concentration at or below the water quality-based
effluent limitation. Pollution prevention measures may be particularly appropriate for persistent
bioaccumulative priority pollutants where there is evidence that beneficial uses are being impacted. The
San Diego Water Board may consider cost effectiveness when establishing the requirements of a PMP.
The completion and implementation of a Pollution Prevention Plan, if required pursuant to Water Code
section 13263.3(d), shall be considered to fulfill the PMP requirements.

ATTACHMENT A – DEFINITIONS

083

A-8

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Rehabilitation
Repair, renewal, and replacement of components to return the system to near-original condition and
performance
Reported Minimum Level (also known as the Reporting Level or RL)
The reported ML (also known as the Reporting Level or RL) is the ML (and its associated analytical
method) chosen by the Discharger for reporting and compliance determination from the MLs included in
this Order, including an additional factor if applicable as discussed herein. The MLs included in this
Order correspond to approved analytical methods for reporting a sample result that are selected by the
San Diego Water Board either from Appendix II of the Ocean Plan in accordance with section III.C.5.a
of the Ocean Plan, or established in accordance with section III.C.5.b of the Ocean Plan. The ML is
based on the proper application of method-based analytical procedures for sample preparation and the
absence of any matrix interferences. Other factors may be applied to the ML depending on the specific
sample preparation steps employed. For example, the treatment typically applied in cases where there
are matrix-effects is to dilute the sample or sample aliquot by a factor of ten. In such cases, thditional
factor must be applied to the ML in the computation of the reported ML.
Severe Property Damage
Substantial physical damage to property, damage to the treatment facilities, which causes them to
become inoperable, or substantial and permanent loss of natural resources that can reasonably be
expected to occur in the absence of a bypass. Severe property damage does not mean economic loss
caused by delays in production. (40 CFR Part 122.41(m)(1)(ii))
Shellfish
Organisms identified by the California Department of Health Services as shellfish for public health
purposes (i.e., mussels, clams, and oysters).
Significant Difference
A statistically significant difference in the means of two distributions of sampling results at the 95
percent confidence level.
Six-Month Median Effluent Limitation
The highest allowable moving median of all daily discharges for any 180-day period.
Sludge
Any solid, semisolid, or liquid waste generated from a municipal, commercial, or industrial wastewater
treatment plant, water supply treatment plant, or air pollution control facility or any other such waste
having similar characteristics and effect.
State Water Quality Protection Areas (SWQPAs)
Non-terrestrial marine or estuarine areas designated to protect marine species or biological
communities from an undesirable alteration in natural water quality. All AREAS OF SPECIAL
BIOLOGICAL SIGNIFICANCE (ASBS) that were previously designated by the State Water Board in
Resolution Nos. 74-28, 74-32, and 75-61 are now also classified as a subset of State Water Quality
Protection Areas and require special protections afforded by the Ocean Plan.

ATTACHMENT A – DEFINITIONS

084

A-9

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

TCDD Equivalents
The sum of the concentrations of chlorinated dibenzodioxins (2,3,7,8-CDDs) and chlorinated
dibenzofurans (2,3,7,8-CDFs) multiplied by their respective toxicity factors, as shown in the table below.
Isomer Group

Toxicity Equivalence
Factor
1.0

2,3,7,8-tetra CDD
2,3,7,8-penta CDD
2,3,7,8-hexa CDDs
2,3,7,8-hepta CDD
octa CDD

0.5
0.1
0.01
0.001

2,3,7,8 tetra CDF
1,2,3,7,8 penta CDF
2,3,4,7,8 penta CDF
2,3,7,8 hexa CDFs
2,3,7,8 hepta CDFs
octa CDF

0.1
0.05
0.5
0.1
0.01
0.001

Thirty-Day Average
See 30-day average above for definition of this term.
Toxicity Identification Evaluation (TIE)
A set of procedures conducted to identify the specific chemical(s) responsible for toxicity. These
procedures are performed in three phases (characterization, identification, and confirmation) using
aquatic organism toxicity tests.)
Toxicity Reduction Evaluation (TRE)
A study conducted in a step-wise process designed to identify the causative agents of effluent or
ambient toxicity, isolate the sources of toxicity, evaluate the effectiveness of toxicity control options, and
then confirm the reduction in toxicity. The first steps of the TRE consist of the collection of data relevant
to the toxicity, including additional toxicity testing, and an evaluation of facility operations and
maintenance practices, and best management practices. A Toxicity Identification Evaluation (TIE) may
be required as part of the TRE, if appropriate. (A TIE is a set of procedures to identify the specific
chemical(s) responsible for toxicity. These procedures are performed in three phases (characterization,
identification, and confirmation) using aquatic organism toxicity tests.)
Transboundary Flows
Wastewater and other flows that cross the international border from Mexico into the United States.
Waste
As used in the Ocean Plan, waste includes a Discharger’s total discharge, of whatever origin, i.e.,
gross, not net, discharge.

ATTACHMENT A – DEFINITIONS

A-10

085

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Water Recycling
The treatment of wastewater to render it suitable for reuse, the transportation of treated wastewater to
the place of use, and the actual use of treated wastewater for a direct beneficial use or controlled use
that would not otherwise occur.
Wet Weather
Wet weather is the period of time of a storm event of 0.1 inches or greater plus 72 hours after cessation
of precipitation, based on the Goat Canyon Pump Station rain gauge, unless otherwise defined by
another regulatory mechanism (e.g. a TMDL).

ATTACHMENT A – DEFINITIONS

A-11

086

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

A.
B.
ATTACHMENT B – MAP
Map of the South Bay International Wastewater Treatment Plant,
South Bay Ocean Outfall, Tijuana River, and Tributary Canyons

South Bay
Ocean Outfall

ATTACHMENT B –MAP

South Bay International
Wastewater Treatment Plant

087

B-1

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Map of Shoreline, Offshore, Trawl, and Rig Fishing Stations

ATTACHMENT B –MAP

088

B-2

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

C.

PERMITTEE NAME
FACILITY NAME
ORDER NO. R9-2014-0009
NPDES NO.CA0108928

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

ATTACHMENT C – FLOW SCHEMATIC

Version: 2005-1

ATTACHMENT C – WASTEWATER FLOW SCHEMATIC

C-1

089

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

PERMITTEE NAME
FACILITY NAME
ORDER NO. R9-2014-0009
NPDES NO.CA0108928

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Version: 2005-1

ATTACHMENT C – WASTEWATER FLOW SCHEMATIC

C-2

090

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

D.
ATTACHMENT D – STANDARD PROVISIONS
I.

STANDARD PROVISIONS – PERMIT COMPLIANCE
A.

Duty to Comply
1.

2.

B.

The Discharger must comply with all of the conditions of this Order. Any noncompliance
constitutes a violation of the Clean Water Act (CWA) and the California Water Code and
is grounds for enforcement action, for permit termination, revocation and reissuance, or
modification; or denial of a permit renewal application. (40 CFR section 122.41(a).)
The Discharger shall comply with effluent standards or prohibitions established under
section 307(a) of the CWA for toxic pollutants and with standards for sewage sludge use
or disposal established under section 405(d) of the CWA within the time provided in the
regulations that establish these standards or prohibitions, even if this Order has not yet
been modified to incorporate the requirement. (40 CFR section 122.41(a)(1).)

Need to Halt or Reduce Activity Not a Defense
The Discharger shall not use as a defense in an enforcement action that halting or reducing
the permitted activity would have been necessary in order to maintain compliance. (40 CFR
section 122.41(c).)

C.

Duty to Mitigate
The Discharger shall take all reasonable steps to minimize or prevent any discharge, or
sludge use or disposal in violation of this Order that has a reasonable likelihood of adversely
affecting human health or the environment. (40 CFR section 122.41(d).)

D.

Proper Operation and Maintenance
The Discharger shall at all times properly operate and maintain all facilities and systems of
treatment and control (and related appurtenances) which are installed or used by the
Discharger to achieve compliance with the conditions of this Order. Proper operation and
maintenance also includes adequate laboratory controls and appropriate quality assurance
procedures. This provision requires the operation of backup or auxiliary facilities or similar
systems that are installed by a Discharger only when necessary to achieve compliance with
the conditions of this Order. (40 CFR section 122.41(e).)

E.

Property Rights
1.
2.

F.

This Order does not convey any property rights of any sort, or any exclusive privileges.
(40 CFR section 122.41(g).)
The issuance of this Order does not authorize any injury to persons or property, or
invasion of other private rights, or any infringement of state or local law or regulations.
(40 CFR section 122.5(c).)

Inspection and Entry
The Discharger shall allow the San Diego Water Board, State Water Board, USEPA, and/or
their authorized representatives (including an authorized contractor acting as their
representative), upon the presentation of credentials and other documents, as may be
required by law, to (40 CFR section 122.41(i); Water Code section 13383):
1.

Enter upon the Discharger's premises where a regulated facility or activity is located or
conducted, or where records are kept under the conditions of this Order (40 CFR section
122.41(i)(1));

ATTACHMENT D – STANDARD PROVISIONS

091

D-1

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

2.
3.

Inspect and photograph, at reasonable times, any facilities, equipment (including
monitoring and control equipment), practices, or operations regulated or required under
this Order (40 CFR section 122.41(i)(3)); and

4.

G.

Have access to and copy, at reasonable times, any records that must be kept under the
conditions of this Order (40 CFR section 122.41(i)(2));

Sample or monitor, at reasonable times, for the purposes of assuring Order compliance
or as otherwise authorized by the CWA or the Water Code, any substances or
parameters at any location. (40 CFR section 122.41(i)(4).)

Bypass
1.

Definitions
a.

“Bypass” means the intentional diversion of waste streams from any portion of a
treatment facility. (40 CFR section 122.41(m)(1)(i).)

b.

“Severe property damage” means substantial physical damage to property, damage
to the treatment facilities, which causes them to become inoperable, or substantial
and permanent loss of natural resources that can reasonably be expected to occur
in the absence of a bypass. Severe property damage does not mean economic loss
caused by delays in production. (40 CFR section 122.41(m)(1)(ii).)

2.

Bypass not exceeding limitations. The Discharger may allow any bypass to occur which
does not cause exceedances of effluent limitations, but only if it is for essential
maintenance to assure efficient operation. These bypasses are not subject to the
provisions listed in Standard Provisions – Permit Compliance I.G.3, I.G.4, and I.G.5
below. (40 CFR section 122.41(m)(2).)

3.

Prohibition of bypass. Bypass is prohibited, and the San Diego Water Board may take
enforcement action against a Discharger for bypass, unless (40 CFR section
122.41(m)(4)(i)):
a.

Bypass was unavoidable to prevent loss of life, personal injury, or severe property
damage (40 CFR section 122.41(m)(4)(i)(A));

b.

There were no feasible alternatives to the bypass, such as the use of auxiliary
treatment facilities, retention of untreated wastes, or maintenance during normal
periods of equipment downtime. This condition is not satisfied if adequate back-up
equipment should have been installed in the exercise of reasonable engineering
judgment to prevent a bypass that occurred during normal periods of equipment
downtime or preventive maintenance (40 CFR section 122.41(m)(4)(i)(B)); and

c.

The Discharger submitted notice to the San Diego Water Board as required under
Standard Provisions – Permit Compliance I.G.5 below. (40 CFR section
122.41(m)(4)(i)(C).)

4.

The San Diego Water Board may approve an anticipated bypass, after considering its
adverse effects, if the San Diego Water Board determines that it will meet the three
conditions listed in Standard Provisions – Permit Compliance I.G.3 above. (40 CFR
section 122.41(m)(4)(ii).)

5.

Notice
a.

Anticipated bypass. If the Discharger knows in advance of the need for a bypass, it
shall submit a notice, if possible at least 10 days before the date of the bypass. (40
CFR section 122.41(m)(3)(i).)

ATTACHMENT D – STANDARD PROVISIONS

092

D-2

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

b.

H.

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Unanticipated bypass. The Discharger shall submit notice of an unanticipated
bypass as required in Standard Provisions - Reporting V.E below (24-hour notice).
(40 CFR section 122.41(m)(3)(ii).)

Upset
Upset means an exceptional incident in which there is unintentional and temporary
noncompliance with technology based permit effluent limitations because of factors beyond
the reasonable control of the Discharger. An upset does not include noncompliance to the
extent caused by operational error, improperly designed treatment facilities, inadequate
treatment facilities, lack of preventive maintenance, or careless or improper operation. (40
CFR section 122.41(n)(1).)
1.

Effect of an upset. An upset constitutes an affirmative defense to an action brought for
noncompliance with such technology based permit effluent limitations if the requirements
of Standard Provisions – Permit Compliance I.H.2 below are met. No determination
made during administrative review of claims that noncompliance was caused by upset,
and before an action for noncompliance, is final administrative action subject to judicial
review. (40 CFR section 122.41(n)(2).)

2.

Conditions necessary for a demonstration of upset. A Discharger who wishes to
establish the affirmative defense of upset shall demonstrate, through properly signed,
contemporaneous operating logs or other relevant evidence that (40 CFR section
122.41(n)(3)):
a.
b.

The permitted facility was, at the time, being properly operated (40 CFR section
122.41(n)(3)(ii));

c.

The Discharger submitted notice of the upset as required in Standard Provisions –
Reporting V.E.2.b below (24-hour notice) (40 CFR section 122.41(n)(3)(iii)); and

d.

3.

An upset occurred and that the Discharger can identify the cause(s) of the upset (40
CFR section 122.41(n)(3)(i));

The Discharger complied with any remedial measures required under
Standard Provisions – Permit Compliance I.C above. (40 CFR section
122.41(n)(3)(iv).)

Burden of proof. In any enforcement proceeding, the Discharger seeking to establish the
occurrence of an upset has the burden of proof. (40 CFR section 122.41(n)(4).)

ATTACHMENT D – STANDARD PROVISIONS

093

D-3

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

II.

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

STANDARD PROVISIONS – PERMIT ACTION
A.

General
This Order may be modified, revoked and reissued, or terminated for cause. The filing of a
request by the Discharger for modification, revocation and reissuance, or termination, or a
notification of planned changes or anticipated noncompliance does not stay any Order
condition. (40 CFR section 122.41(f).)

B.

Duty to Reapply
If the Discharger wishes to continue an activity regulated by this Order after the expiration
date of this Order, the Discharger must apply for and obtain a new permit. (40 CFR section
122.41(b).)

C.

Transfers
This Order is not transferable to any person except after notice to the San Diego Water
Board. The San Diego Water Board may require modification or revocation and reissuance of
the Order to change the name of the Discharger and incorporate such other requirements as
may be necessary under the CWA and the Water Code. (40 CFR sections 122.41(l)(3) and
122.61.)

III.

STANDARD PROVISIONS – MONITORING

A. Samples and measurements taken for the purpose of monitoring shall be representative of
the monitored activity. (40 CFR section 122.41(j)(1).)

B. Monitoring must be conducted according to test procedures under 40 CFR part 136 or, in the
case of sludge use or disposal, approved under 40 CFR part 136 unless otherwise specified
in 40 CFR part 503; or unless other test procedures have been specified in this Order. (40
CFR sections 122.41(j)(4) and 122.44(i)(1)(iv).)
IV. STANDARD PROVISIONS – RECORDS

A. Except for records of monitoring information required by this Order related to the Discharger's
sewage sludge use and disposal activities, which shall be retained for a period of at least five
years (or longer as required by 40 CFR part 503), the Discharger shall retain records of all
monitoring information, including all calibration and maintenance records and all original strip
chart recordings for continuous monitoring instrumentation, copies of all reports required by
this Order, and records of all data used to complete the application for this Order, for a period
of at least three (3) years from the date of the sample, measurement, report or application.
This period may be extended by request of the San Diego Water Board Executive Officer at
any time. (40 CFR section 122.41(j)(2).)

B. Records of monitoring information shall include:
1.

The date, exact place, and time of sampling or measurements (40 CFR section
122.41(j)(3)(i));

2.

The individual(s) who performed the sampling or measurements (40 CFR section
122.41(j)(3)(ii));

3.

The date(s) analyses were performed (40 CFR section 122.41(j)(3)(iii));

4.

The individual(s) who performed the analyses (40 CFR section 122.41(j)(3)(iv));

5.

The analytical techniques or methods used (40 CFR section 122.41(j)(3)(v)); and

6.

The results of such analyses. (40 CFR section 122.41(j)(3)(vi).)

ATTACHMENT D – STANDARD PROVISIONS

094

D-4

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

C. Claims of confidentiality for the following information will be denied (40 CFR section
122.7(b)):
1.
2.
V.

The name and address of any permit applicant or Discharger (40 CFR section
122.7(b)(1)); and
Permit applications and attachments, permits and effluent data. (40 CFR section
122.7(b)(2).)

STANDARD PROVISIONS – REPORTING
A.

Duty to Provide Information
The Discharger shall furnish to the San Diego Water Board, State Water Board, or USEPA
within a reasonable time, any information which the San Diego Water Board, State Water
Board, or USEPA may request to determine whether cause exists for modifying, revoking and
reissuing, or terminating this Order, or to determine compliance with this Order. Upon request,
the Discharger shall also furnish to the San Diego Water Board, State Water Board, or
USEPA copies of records required to be kept by this Order. (40 CFR section 122.41(h); Water
Code section 13267.)

B.

Signatory and Certification Requirements
1.

All applications, reports, or information submitted to the San Diego Water Board, State
Water Board, and/or USEPA shall be signed and certified in accordance with Standard
Provisions – Reporting V.B.2, V.B.3, V.B.4, and V.B.5 below. (40 CFR section
122.41(k).)

2.

All permit applications shall be signed by either a principal executive officer or ranking
elected official. For purposes of this provision, a principal executive officer of a federal
agency includes: (i) the chief executive officer of the agency, or (ii) a senior executive
officer having responsibility for the overall operations of a principal geographic unit of the
agency (e.g., Regional Administrators of USEPA). (40 CFR section 122.22(a)(3).).

3.

All reports required by this Order and other information requested by the San Diego
Water Board, State Water Board, or USEPA shall be signed by a person described in
Standard Provisions – Reporting V.B.2 above, or by a duly authorized representative of
that person. A person is a duly authorized representative only if:
a.
b.

The authorization specifies either an individual or a position having responsibility for
the overall operation of the regulated facility or activity such as the position of plant
manager, operator of a well or a well field, superintendent, position of equivalent
responsibility, or an individual or position having overall responsibility for
environmental matters for the company. (A duly authorized representative may thus
be either a named individual or any individual occupying a named position.) (40
CFR section 122.22(b)(2)); and

c.
4.

The authorization is made in writing by a person described in Standard Provisions –
Reporting V.B.2 above (40 CFR section 122.22(b)(1));

The written authorization is submitted to the San Diego Water Board and State
Water Board. (40 CFR section 122.22(b)(3).)

If an authorization under Standard Provisions – Reporting V.B.3 above is no longer
accurate because a different individual or position has responsibility for the overall
operation of the facility, a new authorization satisfying the requirements of Standard
Provisions – Reporting V.B.3 above must be submitted to the San Diego Water Board

ATTACHMENT D – STANDARD PROVISIONS

095

D-5

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

and State Water Board prior to or together with any reports, information, or applications,
to be signed by an authorized representative. (40 CFR section 122.22(c).)
5.

Any person signing a document under Standard Provisions – Reporting V.B.2 or V.B.3
above shall make the following certification:
“I certify under penalty of law that this document and all attachments were prepared
under my direction or supervision in accordance with a system designed to assure that
qualified personnel properly gather and evaluate the information submitted. Based on
my inquiry of the person or persons who manage the system or those persons directly
responsible for gathering the information, the information submitted is, to the best of my
knowledge and belief, true, accurate, and complete. I am aware that there are significant
penalties for submitting false information, including the possibility of fine and
imprisonment for knowing violations.” (40 CFR section 122.22(d).)

C.

Monitoring Reports
1.
2.

Monitoring results must be reported on a Discharge Monitoring Report (DMR) form or
forms provided or specified by the San Diego Water Board or State Water Board for
reporting results of monitoring of sludge use or disposal practices. (40 CFR section
122.41(l)(4)(i).)

3.

If the Discharger monitors any pollutant more frequently than required by this Order
using test procedures approved under 40 CFR part 136, or another method required for
an industry-specific waste stream under 40 CFR subchapters N or O, the results of such
monitoring shall be included in the calculation and reporting of the data submitted in the
DMR or sludge reporting form specified by the San Diego Water Board. (40 CFR section
122.41(l)(4)(ii).)

4.

D.

Monitoring results shall be reported at the intervals specified in the Monitoring and
Reporting Program (Attachment E) in this Order. (40 CFR section 122.41(l)(4).)

Calculations for all limitations, which require averaging of measurements, shall utilize an
arithmetic mean unless otherwise specified in this Order. (40 CFR section
122.41(l)(4)(iii).)

Compliance Schedules
Reports of compliance or noncompliance with, or any progress reports on, interim and final
requirements contained in any compliance schedule of this Order, shall be submitted no later
than 14 days following each schedule date. (40 CFR section 122.41(l)(5).)

E.

Twenty-Four Hour Reporting
1.

The Discharger shall report any noncompliance that may endanger health or the
environment. Any information shall be provided orally within 24 hours from the time the
Discharger becomes aware of the circumstances. A written submission shall also be
provided within five (5) days of the time the Discharger becomes aware of the
circumstances. The written submission shall contain a description of the noncompliance
and its cause; the period of noncompliance, including exact dates and times, and if the
noncompliance has not been corrected, the anticipated time it is expected to continue;
and steps taken or planned to reduce, eliminate, and prevent reoccurrence of the
noncompliance. (40 CFR section 122.41(l)(6)(i).)

2.

The following shall be included as information that must be reported within 24 hours
under this paragraph (40 CFR section 122.41(l)(6)(ii)):

ATTACHMENT D – STANDARD PROVISIONS

096

D-6

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

a.
b.
3.

F.

Any unanticipated bypass that exceeds any effluent limitation in this Order. (40 CFR
section 122.41(l)(6)(ii)(A).)
Any upset that exceeds any effluent limitation in this Order. (40 CFR section
122.41(l)(6)(ii)(B).)

The San Diego Water Board may waive the above-required written report under this
provision on a case-by-case basis if an oral report has been received within 24 hours.
(40 CFR section 122.41(l)(6)(iii).)

Planned Changes
The Discharger shall give notice to the San Diego Water Board as soon as possible of any
planned physical alterations or additions to the permitted facility. Notice is required under this
provision only when (40 CFR section 122.41(l)(1)):
1.

2.

The alteration or addition could significantly change the nature or increase the quantity
of pollutants discharged. This notification applies to pollutants that are not subject to
effluent limitations in this Order. (40 CFR section 122.41(l)(1)(ii).)

3.

G.

The alteration or addition to a permitted facility may meet one of the criteria for
determining whether a facility is a new source in part 122.29(b) (40 CFR section
122.41(l)(1)(i)); or

The alteration or addition results in a significant change in the Discharger's sludge use
or disposal practices, and such alteration, addition, or change may justify the application
of permit conditions that are different from or absent in the existing permit, including
notification of additional use or disposal sites not reported during the permit application
process or not reported pursuant to an approved land application plan. (40 CFR section
122.41(l)(1)(iii).)

Anticipated Noncompliance
The Discharger shall give advance notice to the San Diego Water Board or State Water
Board of any planned changes in the permitted facility or activity that may result in
noncompliance with this Order’s requirements. (40 CFR section 122.41(l)(2).)

H.

Other Noncompliance
The Discharger shall report all instances of noncompliance not reported under Standard
Provisions – Reporting V.C, V.D, and V.E above at the time monitoring reports are submitted.
The reports shall contain the information listed in Standard Provision – Reporting V.E above.
(40 CFR section 122.41(l)(7).)

I.

Other Information
When the Discharger becomes aware that it failed to submit any relevant facts in a permit
application, or submitted incorrect information in a permit application or in any report to the
San Diego Water Board, State Water Board, or USEPA, the Discharger shall promptly submit
such facts or information. (40 CFR section 122.41(l)(8).)

VI. STANDARD PROVISIONS – ENFORCEMENT
The San Diego Water Board is authorized to enforce the terms of this permit under several
provisions of the Water Code, including, but not limited to, sections 13385, 13386, and 13387.

ATTACHMENT D – STANDARD PROVISIONS

097

D-7

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

VII. ADDITIONAL PROVISIONS – NOTIFICATION LEVELS
All Publicly-Owned Treatment Works (POTWs) shall provide adequate notice to the San Diego
Water Board of the following (40 CFR section 122.42(b)):
1.

Any new introduction of pollutants into the POTW from an indirect discharger that would
be subject to sections 301 or 306 of the CWA if it were directly discharging those
pollutants (40 CFR section 122.42(b)(1)); and

2.

Any substantial change in the volume or character of pollutants being introduced into
that POTW by a source introducing pollutants into the POTW at the time of adoption of
the Order. (40 CFR section 122.42(b)(2).)

3.

Adequate notice shall include information on the quality and quantity of effluent
introduced into the POTW as well as any anticipated impact of the change on the
quantity or quality of effluent to be discharged from the POTW. (40 CFR section
122.42(b)(3).)

ATTACHMENT D – STANDARD PROVISIONS

098

D-8

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

E.
ATTACHMENT E – MONITORING AND REPORTING PROGRAM
Contents
I.  General Monitoring Provisions ...................................................................................................... E-3 
II.  Monitoring Locations ..................................................................................................................... E-4 
III.  Core Monitoring Requirements ..................................................................................................... E-6 
A.  Influent Monitoring Requirements.......................................................................................... E-6 
B.  Effluent Monitoring Requirements ......................................................................................... E-9 
C.  Whole Effluent Toxicity Testing Requirements .................................................................... E-13 
D.  Land Discharge Monitoring Requirements – Not Applicable ............................................... E-14 
E.  Recycling Monitoring Requirements – Not Applicable ......................................................... E-14 
IV.  Receiving Water Monitoring Requirements ................................................................................. E-14 
A.  Shoreline Water Quality Monitoring Requirements ............................................................. E-15 
B.  Offshore Water Quality Monitoring Requirements ............................................................... E-16 
C.  Benthic Monitoring Requirements ....................................................................................... E-18 
D.  Fish and Invertebrate Monitoring Requirements ................................................................. E-23 
E.  Receiving Water Monitoring Reports ................................................................................... E-26 
V.  Regional Monitoring Requirements ............................................................................................. E-28 
A.  Kelp Bed Canopy Monitoring Requirements ....................................................................... E-29 
B.  Southern California Bight Monitoring Program Participation Requirements ........................ E-30 
VI.  Special Studies Requirements .................................................................................................... E-30 
Compliance with Bacteriological Standards ................................................................................ E-30 
VII.  Other Monitoring Requirements .................................................................................................. E-31 
A.  Facilities Spills ..................................................................................................................... E-31 
B.  Transboundary Wastewater Flows ...................................................................................... E-31 
VIII.  Reporting Requirements ............................................................................................................. E-35 
A.  General Monitoring and Reporting Requirements ............................................................... E-35 
B.  Self-Monitoring Report (SMR) Submittal ............................................................................. E-35 
C.  Discharge Monitoring Reports (DMR’s) ............................................................................... E-37 
D.  Other Reports ...................................................................................................................... E-38 
Tables
Table E-1. Monitoring Station Locations ............................................................................................... E-4 
Table E-2. Influent Monitoring ............................................................................................................... E-7 
Table E-3. Effluent Monitoring ............................................................................................................ E-10 
Table E-4. Whole Effluent Toxicity Testing ......................................................................................... E-13 
Table E-5. Approved Test for Chronic Toxicity ................................................................................... E-14 
Table E-6. Shoreline Monitoring Requirements2 ................................................................................. E-15 
Table E-7. Offshore and Kelp/Nearshore Monitoring Requirements .................................................. E-16 
Table E-8. Sediment Monitoring Requirements .................................................................................. E-19 
Table E-9. Fish Tissue Monitoring Requirements ............................................................................... E-24 
Table E-10. Spills and Transboundary Wastewater Flow Monitoring ................................................. E-33 
Table E-11. Monitoring Periods and Reporting Schedule ................................................................... E-35 
Table E-12. Other Reports .................................................................................................................. E-39 

ATTACHMENT E – MRP

099

E-1

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

ATTACHMENT E – MONITORING AND REPORTING PROGRAM (MRP)
Section 308 of the federal Clean Water Act (CWA) and sections 122.41(h), (j)-(l), 122.44(i), and 122.48
of title 40 of the Code of Federal Regulations (40 CFR) require that all National Pollutant Discharge
Elimination System (NPDES) permits specify monitoring and reporting requirements. California Water
Code (Water Code or CWC) sections 13267 and 13383 also authorize the San Diego Water Board to
establish monitoring, inspection, entry, reporting, and recordkeeping requirements. Pursuant to this
authority this Monitoring and Reporting Program (MRP) establishes conditions for the Discharger to
conduct routine or episodic self-monitoring of the discharges regulated under this Order at specified
influent, internal operations, effluent, transboundary wastewater flow, and receiving water monitoring
locations. The MRP requires the Discharger to report the results to the San Diego Water Board with
information necessary to evaluate discharge characteristics and compliance status.
The purpose of the MRP is to determine and ensure compliance with effluent limitations and other
requirements established in this Order, assess treatment efficiency, characterize effluents, characterize
transboundary wastewater flows, and characterize the receiving water and the effects of the discharge
on the receiving water. The MRP also specifies requirements concerning the proper use, maintenance,
and installation of monitoring equipment and methods, and the monitoring type intervals and frequency
necessary to yield data that are representative of the activities and discharges regulated under this
Order.
Each monitoring section contains an introductory paragraph summarizing why the monitoring is needed
and the key management questions the monitoring is designed to answer. In developing the list of key
management questions the San Diego Water Board considered four basic types of information for each
question:
(1) Management Information Need – Why does the San Diego Water Board need to know the
answer?
(2) Monitoring Criteria – What monitoring will be conducted for deriving an answer to the question?
(3) Expected Product – How should the answer be expressed and reported?
(4) Possible Management Actions – What actions will be potentially influenced by the answer?
The framework for this monitoring program has three components that comprise a range of spatial and
temporal scales: 1. core monitoring, 2. regional monitoring, and 3. special studies.
1. Core monitoring consists of the basic site-specific monitoring necessary to measure compliance
with individual effluent limits and/or impacts to receiving water quality. Core monitoring is typically
conducted in the immediate vicinity of the discharge by examining local scale spatial effects.
2. Regional monitoring provides information necessary to make assessments over large areas and
serves to evaluate cumulative effects of all anthropogenic inputs. Regional monitoring data also
assists in the interpretation of core monitoring studies. In the event that a regional monitoring effort
takes place during the permit cycle in which the MRP does not specifically address regional
monitoring, the San Diego Water Board may allow relief from aspects of core monitoring
components in order to encourage participation pursuant to section V.B of this MRP.
3. Special studies are directed monitoring efforts designed in response to specific management or
research questions identified through either core or regional monitoring programs. Often they are
used to help understand core or regional monitoring results, where a specific environmental
process is not well understood, or to address unique issues of local importance.

ATTACHMENT E – MRP

100

E-2

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

I.

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

GENERAL MONITORING PROVISIONS
A.

Samples and measurements taken as required herein shall be representative of the volume
and nature of the monitoring discharge. All samples shall be taken at the monitoring points
specified in Section II Table E-1 below and, unless otherwise specified, before the monitored
flow joins or is diluted by any other waste stream, body of water, or substance. Monitoring
points shall not be changed without notification to and the approval of the San Diego Water
Board. Samples shall be collected at times representative of “worst case” conditions with
respect to compliance with the requirement of this Order.

B.

Appropriate flow measurement devices and methods consistent with accepted scientific
practices shall be selected and used to ensure the accuracy and reliability of measurements
of the volume of monitored discharges. The devices shall be installed, calibrated and
maintained to ensure that the accuracy of the measurement is consistent with the accepted
capability of that type of device. Devices selected shall be capable of measuring flows with a
maximum deviation of less than ±5 percent from true discharge rates throughout the range of
expected discharge volumes.

C.

Monitoring must be conducted according to United States Environmental Protection Agency
(USEPA) test procedures approved at 40 CFR part 136, Guidelines Establishing Test
Procedures for the Analysis of Pollutants Under the Clean Water Act as amended, or unless
other test procedures are specified in this Order and attachments thereof or otherwise
specified by the San Diego Water Board. Alternative test procedures not specified in this
order are also subject USEPA approval.

D.

All analyses shall be performed in a laboratory certified to perform such analyses by the
California Department of Public Health (CDPH) or a laboratory approved by the San Diego
Water Board. The laboratory must be accredited under the CDPH Environmental Laboratory
Accreditation Program (ELAP) to ensure the quality of analytical data used for regulatory
purposes to meet the requirements of this Order. Additional information on ELAP can be
accessed at http://www.cdph.ca.gov/certlic/labs/Pages/ELAP-CAInformation.aspx.

E.

Records of monitoring information shall include information required under Attachment D,
Standard Provisions, section IV.

F.

All monitoring instruments and devices used by the Discharger to fulfill the prescribed
monitoring program shall be properly maintained and calibrated as necessary to ensure their
continued accuracy. All flow measurement devices shall be calibrated at least once per year,
or more frequently, to ensure continued accuracy of the devices.

G. The Discharger shall have, and implement, an acceptable written quality assurance (QA)
plan for laboratory analyses. Duplicate chemical analyses must be conducted on a minimum
of 10 percent of the samples or at least one sample per month, whichever is greater. A
similar frequency shall be maintained for analyzing spiked samples. When requested by
USEPA or the San Diego Water Board, the Discharger shall participate in a NPDES
discharge monitoring report QA performance study. The Discharger shall have a success
rate equal to or greater than 80 percent.
H.

Analysis for toxic pollutants, with effluent limitations or performance goals based on water
quality objectives of the California Ocean Plan, shall be conducted in accordance with
procedures described in the California Ocean Plan and restated in this MRP.

ATTACHMENT E – MRP

101

E-3

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

II.

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

MONITORING LOCATIONS
The Discharger shall establish the following monitoring locations to demonstrate compliance with
the effluent limitations, discharge specifications, and other requirements in this Order:
Table E-1. Monitoring Station Locations
Discharge
Point No.

Monitoring
Location
Name

--

INF-001

001

EFF-001

C1

C2
C3
C4
C5

--

S-0

--

S-2

--

S-3

--

S-4

--

S-5

--

S-6

--

S-8

--

S-9

ATTACHMENT E – MRP

Monitoring Location Description
At a location where all influent wastestream flows to South Bay International
Wastewater Treatment Plant (IWTP or Facility) are accounted for in monitoring
events; upstream of any in-plant return flows; and where representative samples
of influent can be collected before any process or treatment that could alter the
properties of the influent.
Latitude: 32° 32’ 29.94’’N; Longitude:117°03’ 33.75”W
Downstream of any in-plant return flows at the Facility where representative
samples of effluent treated at the Facility can be collected, prior to commingling
with other discharges contributing to the South Bay Ocean Outfall (SBOO).
Latitude: 32° 32’ 37.68”N; Longitude:117° 03’ 54.83”W
TRANSBOUNDARY STATIONS
Goat Canyon Diversion Structure;
Approximate Location at Latitude: 32° 32' 13.1994"N; Longitude: 117° 5'
57.516"’W
Smugglers Gulch Diversion Structure;
Approximate Location at Latitude: 32° 32' 23.2794"N; Longitude: 117° 5'
12.8394"W
Silva Drain Canyon Collector;
Approximate Location at Latitude: 32° 32' 22.0554"N; Longitude: 117° 3'
55.4394"W
Canyon del Sol Collector;
Approximate Location at Latitude: 32° 32' 21.0114"N; Longitude: 117° 4'
7.1754"W
Stewart’s Drain Canyon Collector;
Approximate Location at Latitude: 32° 32' 25.6914"N; Longitude: 117° 3'
28.1874"W
SHORELINE STATIONS
Latitude: 32° 25.148’N; Longitude:117°05.837’W
Mexico (Southernmost location)
Latitude: 32° 29.922’N; Longitude:117°07.380’W
Mexico (Beach south of El Vigia Restaurant)
Latitude: 32° 31.542’N; Longitude:117°07.440’W
Mexico (Beach at end of existing road of Playas de Tijuana)
Latitude: 32° 32.118’N; Longitude:117°07.500’W
United States (Beach just north of the border fence)
Latitude: 32° 33.468’N; Longitude:117°07.860’W
United States (Beach north of mouth of estuary)
Latitude: 32° 33.978’N; Longitude:117°07.980’W
United States (Beach at end of Seacoast Drive)
Latitude: 32°38.208’N; Longitude:117°08.640’W
United States (Silver Strand State Beach, Area 4 West of Coronado Cays)
Latitude: 32°40.620’N; Longitude:117°10.680’W
United States
(Beach at end of Avenida Del Sol seaward of Hotel Del Coronado)

102

E-4

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Discharge
Point No.

Monitoring
Location
Name

--

S-10

--

S-11

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Monitoring Location Description

-------------------

I-1
I-2
I-3
I-4
I-5
I-6
I-7
I-8
I-9
I-10
I-11
I-12
I-13
I-14
I-15
I-16
I-17
I-18

Latitude: 32°32.598’N; Longitude:117°07.500’W
United States (Beach at the terminus of Monument Road)
Latitude: 32°33.678’N; Longitude:117°07.920’W
United States
(Beach approximately ¾ miles north of the mouth of the Tijuana River)
Latitude: 32°35.142’N; Longitude:117°07.980’W
United States (Beach at the end of Carnation Street)
OFFSHORE STATIONS1,2
Latitude: 32°28.400’N; Longitude:117°16.620’W; DEPTH 198 ft (60 m)
Latitude: 32°28.400’N; Longitude:117°11.940’W; DEPTH 106 ft (32 m)
Latitude: 32°28.020’N; Longitude:117°10.080’W; DEPTH 89 ft (27 m)3
Latitude: 32°28.300’N; Longitude:117°08.400’W; DEPTH 59 ft (18 m)
Latitude: 32°28.300’N; Longitude:117°07.800’W; DEPTH 46 ft (14 m)4
Latitude: 32°29.610’N; Longitude:117°09.780’W; DEPTH 86 ft (26 m)
Latitude: 32°31.000’N; Longitude:117°15.180’W; DEPTH 172 ft (52 m)5
Latitude: 32°31.000’N; Longitude:117°12.120’W; DEPTH 118 ft (36 m)6
Latitude: 32°30.700’N; Longitude:117°10.740’W; DEPTH 96 ft (29 m)3
Latitude: 32°31.000’N; Longitude:117°09.360’W; DEPTH 63 ft (19 m)7
Latitude: 32°30.800’N; Longitude:117°08.220’W; DEPTH 43 ft (13 m)4
Latitude: 32°31.970’N; Longitude:117°10.980’W; DEPTH 92 ft (28 m)3
Latitude: 32°32.250’N; Longitude:117°12.720’W; DEPTH 125 ft (38 m)6
Latitude: 32°32.580’N; Longitude:117°11.040’W; DEPTH 92 ft (28 m)3
Latitude: 32°32.270’N; Longitude:117°11.340’W; DEPTH 102 ft (31 m)
Latitude: 32°32.270’N; Longitude:117°10.980’W; DEPTH 92 ft (28 m)3
Latitude: 32°32.270’N; Longitude:117°10.680’W; DEPTH 83 ft (25 m)
Latitude: 32°32.170’N; Longitude:117°09.660’W; DEPTH 63 ft (19 m)7

-----

I-20
I-21
I-22
I-23

Latitude: 32°33.420’N; Longitude:117°15.420’W; DEPTH 182 ft (55 m)8
Latitude: 32°33.640’N; Longitude:117°13.620’W; DEPTH 135 ft (41 m)6
Latitude: 32°33.200’N; Longitude:117°11.100’W; DEPTH 92 ft (28 m)3
Latitude: 32°33.050’N; Longitude:117°09.900’W; DEPTH 69 ft (21 m)7

------

I-27
I-28
I-29
I-30
I-31

Latitude: 32°34.450’N; Longitude:117°11.460’W; DEPTH 92 ft (28 m)
Latitude: 32°35.630’N; Longitude:117°15.840’W; DEPTH 182 ft (55 m)
Latitude: 32°35.670’N; Longitude:117°13.380’W; DEPTH 125 ft (38 m)
Latitude: 32°35.720’N; Longitude:117°11.820’W; DEPTH 92 ft (28 m)3
Latitude: 32°35.730’N; Longitude:117°10.320’W; DEPTH 63 ft (19 m)

-------

I-33
I-34
I-35
I-36
I-37
I-38

Latitude: 32°37.430’N; Longitude:117°14.220’W; DEPTH 99 ft (30 m)3
Latitude: 32°37.800’N; Longitude:117°12.960’W; DEPTH 63 ft (19 m)
Latitude: 32°38.200’N; Longitude:117°10.920’W; DEPTH 63 ft (19 m)
Latitude: 32°38.350’N; Longitude:117°09.240’W; DEPTH 36 ft (11 m)4
Latitude: 32°38.880’N; Longitude:117°12.980’W; DEPTH 40 ft (12 m)4
Latitude: 32°40.130’N; Longitude:117°11.200’W; DEPTH 36 ft (11 m)4

--

I-19

KELP/NEARSHORE STATIONS
Latitude: 32°32.180’N; Longitude:117°07.740’W; DEPTH 33 ft (10 m)4

S-12

ATTACHMENT E – MRP

103

E-5

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Discharge
Point No.
---------------1.

2.

3.
4.
5.
6.
7.
8.
9.

Monitoring
Location
Name
I-24
I-25
I-26
I-32
I-39
I-40
SD-15
(Zone 9)
SD-16
(Zone 8)
SD-17
(Zone 5)
SD-18
(Zone 5)
SD-19
(Zone 6)
SD-20
(Zone 6)
SD-21
(Zone 7)
RF-3
RF-4

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Monitoring Location Description
Latitude: 32°33.400’N; Longitude:117°08.700’W; DEPTH 36 ft (11 m)4
Latitude: 32°33.670’N; Longitude:117°08.880’W; DEPTH 30 ft (9 m)9
Latitude: 32°34.470’N; Longitude:117°08.820’W; DEPTH 30 ft (9 m)9
Latitude: 32°35.680’N; Longitude:117°08.280’W; DEPTH 33 ft (10 m)9
Latitude: 32°34.340’N; Longitude:117°10.050’W; DEPTH 59 ft (18 m)7
Latitude: 32°33.230’N; Longitude:117°08.170’W; DEPTH 33 ft (10 m)9
TRAWL STATIONS
Latitude: 32°28.350’N; 117°10.500’W; DEPTH: 89 ft (27 m)
Latitude: 32°31.000’N; 117°10.720’W; DEPTH: 89 ft (27 m)
Latitude: 32°32.200’N; 117°11.430’W; DEPTH: 99 ft (30 m)
Latitude: 32°32.580’N; 117°11.350’W; DEPTH: 99 ft (30 m)
Latitude: 32°33.500’N; 117°11.080’W; DEPTH: 92 ft (28 m)
Latitude: 32°34.680’N; 117°11.450’W; DEPTH: 96 ft (29 m)
Latitude: 32°36.990’N; 117°12.690’W; DEPTH: 96 ft (29 m)
RIG FISHING STATIONS
Latitude: 32°32.270’N; 117°11.000’W; DEPTH: 89 ft (27 m)
Latitude: 32°25.910’N; 117°17.655’W; DEPTH: 89 ft (27 m)

All 40 offshore and kelp/nearshore stations designated I-1 to I-40 are monitored for visual observations, temperature,
depth, pH, salinity, dissolved oxygen, light transmittance, and chlorophyll-a as indicated in Table E-7.
A total of 28 of the above offshore and kelp/nearshore stations are also monitored for total coliforms, fecal coliforms, and
Enterococcus as indicated in Table E-7. These stations include I-3, I-5, I-7 to I-14, I-16, I-18 to I-26, I-30, I-32, I-33, and I36 to I-40.
Discrete depths for fecal indicator bacteria samples include: 2m, 18m, and 27m.
Discrete depths for fecal indicator bacteria samples include: 2m, 6m, and 11m.
Discrete depths for fecal indicator bacteria samples include: 2m, 18m, and 52m.
Discrete depths for fecal indicator bacteria samples include: 2m, 18m, and 37m.
Discrete depths for fecal indicator bacteria samples include: 2m, 12m, and 18m.
Discrete depths for fecal indicator bacteria samples include: 2m, 18m, and 55m.
Discrete depths for fecal indicator bacteria samples include: 2m, 6m, and 9m.

The North latitude and West longitude information in Table E-1 are approximate for administrative purposes.
A map of the shoreline stations, offshore stations, trawl stations, and rig fishing stations monitoring locations
is provided in Attachment B of this Order.

III.

CORE MONITORING REQUIREMENTS
A. Influent Monitoring Requirements
Influent monitoring is the collection and analysis of samples or measurements of wastewater
prior to the treatment processes. Influent monitoring of a wastewater stream prior to entering
the treatment plant is necessary to address the following questions:
(1) Is the pretreatment program effectively controlling pollutant loads from industrial facilities?

ATTACHMENT E – MRP

104

E-6

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

(2) What is the frequency of unexpected industrial discharges (or pollutants loads) which can
cause or contribute to an upset in the wastewater process?
(3) Is the influent inhibiting or disrupting the IWTP, its treatment processes or operations, or
its sludge processes, use, or disposal?
(4) Is the influent complying with influent limitations prescribed in the Order?
(5) Is the Facility complying with permit conditions, including but not limited to carbonaceous
biochemical oxygen demand (CBOD5) and total suspended solids (TSS) percent removal
limitations?
The Discharger shall monitor the influent at Monitoring Location Name INF-001 as follows:
Table E-2. Influent Monitoring
Sample Type

MGD

Recorder/Totalizer

Continuous

mg/L

24-hr Composite

1/Day3,4

2

mg/L

24-hr Composite

1/Day3,4

2

mg/L
mg/L
mg/L
°F
mg/L
mg/L
ml/L
NTU
pH
Units
μg/L
μg/L

24-hr Composite
24-hr Composite
24-hr Composite
Grab
24-hr Composite
Grab
Grab
24-hr Composite

1/Day3,4
1/Day3,4
1/Week4,5
1/Day3,4
1/Week5
1/Week4,5
1/Week5
1/Week5

2

Grab

1/Week5

2

24-hr Composite
24-hr Composite

1/Week4,5
1/Week4,5

2

μg/L

24-hr Composite

1/Week4,5

2

μg/L
μg/L
μg/L
μg/L
μg/L
μg/L
μg/L
μg/L
μg/L

24-hr Composite
24-hr Composite
24-hr Composite
24-hr Composite
24-hr Composite
24-hr Composite
24-hr Composite
24-hr Composite
24-hr Composite

1/Week4,5
1/Week4,5
1/Week4,5
1/Week4,5
1/Week4,5
1/Week4,5
1/Week4,5
1/Week4,5
1/Month4,5

2

μg/L

24-hr Composite

1/Month4,5

2

μg/L

24-hr Composite

1/Month4,5

2

μg/L
μg/L

24-hr Composite
24-hr Composite

1/Month4,5
1/Month4,5

2

Parameter

Units

Flow
Carbonaceous Biochemical
Oxygen Demand (5-Day at 20oC)
(CBOD5)
Biochemical Oxygen Demand (5day @ 20°C) (BOD5)
Total Suspended Solids (TSS)
Volatile Suspended Solids
Total Dissolved Solids (TDS)
Temperature
Floating Particulates
Grease and Oil
Settleable Solids
Turbidity
pH
Arsenic, Total Recoverable
Cadmium, Total Recoverable
Chromium (VI) , Total
Recoverable6
Copper, Total Recoverable
Lead, Total Recoverable
Mercury, Total Recoverable
Nickel, Total Recoverable
Selenium, Total Recoverable
Silver, Total Recoverable
Zinc, Total Recoverable
Cyanide, Total Recoverable
Ammonia (as N)
Phenolic Compounds
(nonchlorinated)1
Phenolic Compounds
(chlorinated)1
Endosulfan1
Endrin
ATTACHMENT E – MRP

Required
Analytical
Test
Method
--

Minimum
Sampling
Frequency

1

2
2
2
2
2
2
2

2

2
2
2
2
2
2
2
2

2

105

E-7

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Required
Analytical
Test
Method

Sample Type

Minimum
Sampling
Frequency

μg/L
μg/L
μg/L
μg/L
μg/L
μg/L
µg/L

24-hr Composite
24-hr Composite
Grab
24-hr Composite
24-hr Composite
Grab
Grab

1/Month4,5
1/Month4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5

2

µg/L

24-hr Composite

1/Quarter4,5

2

µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
μg/L
μg/L
μg/L
μg/L
μg/L
μg/L
μg/L
μg/L
μg/L

24-hr Composite
Grab
24-hr Composite
24-hr Composite
24-hr Composite
24-hr Composite
Grab
24-hr Composite
24-hr Composite
Grab
24-hr Composite
Grab
24-hr Composite
Grab
Grab
24-hr Composite
Grab
24-hr Composite
24-hr Composite
Grab
24-hr Composite
Grab
24-hr Composite

1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5

2

μg/L

Grab

1/Quarter4,5

2

μg/L
μg/L
μg/L
μg/L
μg/L
μg/L
μg/L

Grab
24-hr Composite
Grab
24-hr Composite
Grab
Grab
Grab

1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5

2

μg/L

Grab

1/Quarter4,5

2

μg/L

Grab

1/Quarter4,5

2

μg/L
μg/L
μg/L
μg/L

24-hr Composite
24-hr Composite
24-hr Composite
Grab

1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5

2

Parameter

Units

HCH1
Radioactivity
Acrolein
Antimony, Total Recoverable
Bis (2-chloroethoxy) Methane
Bis (2-chloroisopropyl) Ether
Chlorobenzene
Chromium (III), Total
Recoverable6
Di-n-butyl Phthalate
Dichlorobenzenes1
Diethyl Phthalate
Dimethyl Phthalate
4,6-dinitro-2-methylphenol
2,4-dinitrophenol
Ethylbenzene
Fluoranthene
Hexachlorocyclopentadiene
Nitrobenzene
Thallium, Total Recoverable
Toluene
Tributyltin
1,1,1-trichloroethane
Acrylonitrile
Aldrin
Benzene
Benzidine
Beryllium, Total Recoverable
Bis(2-chloroethyl) ether
Bis(2-ethylhexyl) phthalate
Carbon tetrachloride
Chlordane1
Chlorodibromomethane
(dibromochloromethane)
Chloroform
DDT1
1,4-Dichlorobenzene
3,3’-Dichlorobenzidine
1,2-Dichloroethane
1,1-Dichloroethylene
Dichlorobromomethane
Dichloromethane
(Methylene Chloride)
1,3-Dichloropropene
(1,3-Dichloropropylene)
Dieldrin
2,4-Dinitrotoluene
1,2-Diphenylhydrazine
Halomethanes1
ATTACHMENT E – MRP

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

1

2
2
2
2
2
2

2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2
2

2
2
2
2
2
2

2
2
2

106

E-8

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Sample Type

μg/L
μg/L
μg/L
μg/L
μg/L
μg/L
μg/L
μg/L
μg/L
μg/L
μg/L
μg/L
μg/L

24-hr Composite
24-hr Composite
24-hr Composite
24-hr Composite
24-hr Composite
24-hr Composite
24-hr Composite
24-hr Composite
24-hr Composite
24-hr Composite
24-hr Composite
24-hr Composite
Grab

1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5

2

μg/L

Grab

1/Quarter4,5

2

μg/L

24-hr Composite

1/Quarter4,5

2

μg/L

Grab

1/Quarter4,5

2

μg/L
μg/L
μg/L

Grab
Grab
Grab

1/Quarter4,5
1/Quarter4,5
1/Quarter4,5

2

Units

Heptachlor
Heptachlor Epoxide
Hexachlorobenzene
Hexachlorobutadiene
Hexachloroethane
Isophorone
N-nitrosodimethylamine
N-nitrosodi-N-propylamine
N-nitrosodiphenylamine
PAHs1
PCBs1
TCDD equivalents1
1,1,2,2-Tetrachoroethane
Tetrachloroethylene
(Tetrachloroethene)
Toxaphene
Trichloroethylene
(Trichloroethene)
1,1,2-Trichloroethane
2,4,6-Trichlorophenol
Vinyl Chloride
2.

Required
Analytical
Test
Method

Minimum
Sampling
Frequency

Parameter

1.

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

1

2
2
2
2
2
2
2
2
2
2
2
2

2
2

See Attachment A for definitions of abbreviations and a glossary of common terms used in this Order.
As required under 40 CFR part 136.

3.

Five days per week except seven days per week for at least one week during July or August of each
year.

4.

The Discharger shall calculate and report the mass emission rate (MER) of the constituent for each
sample taken. The MER shall be calculated in accordance with section VII.I.4 of this Order.

5.

The minimum frequency shall be increased from 1/Week to 5/Week, 1/Month to 1/Week, or 1/Quarter
to 1/Month, as appropriate, if any result for this parameter exceeds the applicable interim or final
influent limitation specified in this Order, as appropriate. The increased minimum frequency of
monitoring shall remain in effect until the results of a minimum of four consecutive analyses for this
parameter are below all applicable interim or final influent limitation specified in this Order, as
appropriate.

6.

The Discharger may, at their option, monitor for total recoverable chromium in lieu of total recoverable
chromium (III) or total recoverable chromium (VI).

B. Effluent Monitoring Requirements
Effluent monitoring is the collection and analysis of samples or measurements of effluents,
after all treatment processes, to determine and quantify contaminants and demonstrate
compliance with applicable effluent limitations, standards, and other requirements of this
Order.
Effluent monitoring is necessary to address the following questions:
(1) Does the effluent comply with permit effluent limitations, performance goals, and other
requirements of this Order, thereby ensuring that water quality standards are achieved in
the receiving water?
(2) What is the mass of constituents that are discharged daily, monthly or annually?

ATTACHMENT E – MRP

107

E-9

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

(3) Is the effluent concentration or mass changing over time?
(4) Is the Facility being properly operated and maintained to ensure compliance with the
conditions of the Order?
The Discharger shall monitor the effluent at Monitoring Location EFF-001 as follows:
Table E-3. Effluent Monitoring
Parameter

Units1

Sample Type

Minimum Sampling
Frequency

Required
Analytical
Test Method
--

MGD
Recorder/Totalizer
Continuous2
6
mg/L
24-hr Composite
1/Day3,4
3,4
6
mg/L
24-hr Composite
1/Day
3,4
6
mg/L
24-hr Composite
1/Day
3
6
mg/L
24-hr Composite
1/Day
3
6
mg/L
24-hr Composite
1/Day
3
6
°C
Grab
1/Day
5
mg/L
Grab
1/Week
6
mg/L
24-hr Composite
1/Day3
4,5
6
mg/L
Grab
1/Week
3
6
mL/L
Grab
1/Day
3
6
NTU
24-hr Composite
1/Day
pH
6
pH
Grab
1/Day3
Units
TABLE 1 PARAMETERS FOR PROTECTION OF MARINE AQUATIC LIFE
6
Arsenic, Total Recoverable
µg/L
24-hr Composite
1/Week4,5
Cadmium, Total
6
µg/L
24-hr Composite
1/ Week4,5
Recoverable
Chromium (VI), Total
6
µg/L
24-hr Composite
1/Week4,5
Recoverable7
6
Copper, Total Recoverable
µg/L
24-hr Composite
1/Week4,5
4,5
6
Lead, Total Recoverable
µg/L
24-hr Composite
1/Week
4,5
6
Mercury, Total Recoverable
µg/L
24-hr Composite
1/Week
4,5
6
Nickel, Total Recoverable
µg/L
24-hr Composite
1/Week
Selenium, Total
6
µg/L
24-hr Composite
1/Week4,5
Recoverable
6
Silver, Total Recoverable
µg/L
24-hr Composite
1/Week4,5
4,5
6
Zinc, Total Recoverable
µg/L
24-hr Composite
1/Week
4,5
6,8
Cyanide, Total Recoverable
µg/L
24-hr Composite
1/Week
6
Total Chlorine Residual9
µg/L
Grab
1/Day4
Ammonia Nitrogen, Total (as
6
mg/L
24-hr Composite
1/Month4,5
N)
Phenolic Compounds
6
µg/L
24-hr Composite
1/ Month4,5
(nonchlorinated)1
Phenolic Compounds
6
µg/L
24-hr Composite
1/Month4,5
(chlorinated)1
6
Endosulfan
µg/L
24-hr Composite
1/ Month4,5
4,5
6
Endrin
µg/L
24-hr Composite
1/ Month
1
4,5
6
HCH
µg/L
24-hr Composite
1/Month
6
4,5
Radioactivity
pCi/L
24-hr Composite
1/ Month
TABLE 1 PARAMETERS FOR PROTECTION OF HUMAN HEALTH – NONCARCINOGENS
6
Acrolein
µg/L
Grab
1/Quarter4,5
Flow
CBOD5
BOD5
TSS
Volatile Suspended Solids
Total Dissolved Solids
Temperature
Dissolved Oxygen
Floating Particulates
Grease and Oil
Settleable Solids
Turbidity

ATTACHMENT E – MRP

E-10

108

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Parameter

Units1

Sample Type

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928
Minimum Sampling
Frequency

Required
Analytical
Test Method

Antimony, Total
24-hr Composite
1/Quarter4,5
µg/L
Recoverable
Bis (2-chloroethoxy)
1/Quarter4,5
µg/L
24-hr Composite
Methane
Bis (2-chloroisopropyl) Ether
µg/L
Grab
1/Quarter4,5
Chlorobenzene
µg/L
Grab
1/Quarter4,5
1/Quarter4,5
Chromium (III), Total
µg/L
24-hr Composite
Recoverable7
Di-n-butyl Phthalate
µg/L
24-hr Composite
1/Quarter4,5
1
Dichlorobenzenes
µg/L
Grab
1/Quarter4,5
Diethyl Phthalate
µg/L
24-hr Composite
1/Quarter4,5
Dimethyl Phthalate
µg/L
24-hr Composite
1/Quarter4,5
4,6-dinitro-2-methylphenol
µg/L
24-hr Composite
1/Quarter4,5
2,4-dinitrophenol
µg/L
24-hr Composite
1/Quarter4,5
Ethylbenzene
µg/L
Grab
1/Quarter4,5
Fluoranthene
µg/L
24-hr Composite
1/Quarter4,5
Hexachlorocyclopentadiene
µg/L
24-hr Composite
1/Quarter4,5
Nitrobenzene
µg/L
Grab
1/Quarter4,5
Thallium, Total Recoverable
µg/L
24-hr Composite
1/Quarter4,5
Toluene
µg/L
Grab
1/Quarter4,5
Tributyltin
µg/L
24-hr Composite
1/Quarter4,5
1,1,1-trichloroethane
µg/L
Grab
1/Quarter4,5
TABLE 1 PARAMETERS FOR PROTECTION OF HUMAN HEALTH – CARCINOGENS
Acrylonitrile
µg/L
Grab
1/Quarter4,5
Aldrin
µg/L
24-hr Composite
1/Quarter4,5
Benzene
µg/L
Grab
1/Quarter4,5
Benzidine
µg/L
24-hr Composite
1/Quarter4,5
Beryllium, Total
24-hr composite
1/Quarter4,5
µg/L
Recoverable
Bis (2-chloroethyl) Ether
µg/L
Grab
1/Quarter4,5
Bis (2-ethlyhexyl) Phthalate
µg/L
24-hr Composite
1/Quarter4,5
Carbon Tetrachloride
µg/L
Grab
1/Quarter4,5
1
Chlordane
µg/L
24-hr Composite
1/Quarter4,5
Chlorodibromomethane
Grab
1/Quarter4,5
µg/L
(dibromochloromethane)
Chloroform
µg/L
Grab
1/Quarter4,5
1
DDT
µg/L
24-hr Composite
1/Quarter4,5
1,4-dichlorobenzene
µg/L
Grab
1/Quarter4,5
3,3'-dichlorobenzidine
µg/L
24-hr Composite
1/Quarter4,5
1,2-dichloroethane
µg/L
Grab
1/Quarter4,5
1,1-dichloroethylene
µg/L
Grab
1/Quarter4,5
Dichlorobromomethane
µg/L
Grab
1/Quarter4,5
Dichloromethane
Grab
1/Quarter4,5
µg/L
(Methylene Chloride)
1,3-dichloropropene
Grab
1/Quarter4,5
µg/L
(1,3-Dichloropropylene)
Dieldrin
µg/L
24-hr Composite
1/Quarter4,5
2,4-dinitrotoluene
µg/L
24-hr Composite
1/Quarter4,5
1,2-diphenylhydrazine
µg/L
24-hr Composite
1/Quarter4,5
1
Halomethanes
µg/L
Grab
1/Quarter4,5
ATTACHMENT E – MRP

6

6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6

6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6
6

6
6
6
6
6

E-11

109

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928
Required
Analytical
Test Method

Parameter

2
3
4
5

6

7
8

9

Sample Type

Minimum Sampling
Frequency

Heptachlor
Heptachlor Epoxide
Hexachlorobenzene
Hexachlorobutadiene
Hexachloroethane
Isophorone
N-nitrosodimethylamine
N-nitrosodi-N-propylamine
N-nitrosodiphenylamine
PAHs1
PCBs1
TCDD equivalents1
1,1,2,2-tetrachloroethane
Tetrachloroethylene
(Tetrachloroethene)
Toxaphene
Trichloroethylene
(Trichloroethene)
1,1,2-trichloroethane
2,4,6-trichlorophenol
Vinyl Chloride
1

Units1
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L

24-hr Composite
24-hr Composite
24-hr Composite
24-hr Composite
24-hr Composite
24-hr Composite
24-hr Composite
24-hr Composite
24-hr Composite
24-hr Composite
24-hr Composite
24-hr Composite
Grab
Grab

1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5
1/Quarter4,5

6

24-hr Composite
Grab

1/Quarter4,5
1/Quarter4,5

6

Grab
Grab
Grab

1/Quarter4,5
1/Quarter4,5
1/Quarter4,5

6

µg/L
µg/L
µg/L
µg/L
µg/L
µg/L

6
6
6
6
6
6
6
6
6
6
6
6
6

6

6
6

See Attachment A for definitions of abbreviations and a glossary of common terms used in this Order
Report the total daily effluent flow and the monthly average effluent flow.
The minimum sampling frequency shall be five days per week and shall increase to seven days per week for at
least one week during July or August of each year.
The Discharger shall calculate and report the mass emission rate (MER) of the constituent for each sample taken.
The MER shall be calculated in accordance with section VII.I.4 of this Order.
The minimum frequency shall be increased from 1/Week to 5/Week, 1/Month to 1/Week, or 1/Quarter to 1/Month,
as appropriate , if any result for this parameter exceeds the applicable effluent limitation or performance goal
specified in this Order. The increased minimum frequency of monitoring shall remain in effect until the results of a
minimum of four consecutive analyses for this parameter are below all applicable effluent limitations or performance
goals specified in this Order.
The analytical test methods for compliance determinations shall use minimum levels specified in Appendix II of the
Ocean Plan used as required under 40 CFR part 136. The Discharger shall select minimum levels that are below
the effluent limitation or performance goal. If no minimum level value is below the effluent limitation or performance
goal, the Discharger shall select the lowest minimum level value and its associated analytical method.
The Discharger may, at their option, apply this performance goal as a total chromium performance goal and monitor
for total recoverable chromium in lieu of total recoverable chromium (III) or total recoverable chromium (VI).
If a Discharger can demonstrate to the satisfaction of the USEPA and the State Water Board that an analytical
method is available to reliably distinguish between strongly and weakly complexed cyanide, effluent limitations for
cyanide may be met by the combined measurement of free cyanide, simple alkali metals cyanides, and weakly
complexed organometallic cyanide complexes. In order for the analytical method to be acceptable, the recovery of
free cyanide from metal complexes must be comparable to that achieved by the approved method in 40 CFR part
136.
Monitoring of total chlorine residual is required at the frequency specified when any of the treatment units that are
the subject of this Order use chlorine for disinfection. Monitoring of total chlorine residual is not required on days
when none of the treatment units that are subject to this Order use chlorine for disinfection. If only one sample is
collected for total chlorine residual analysis on a particular day, that sample must be collected at the time when the
concentration of total chlorine residual in the discharge would be expected to be greatest. The times of chlorine
discharges on the days that samples are collected, and the time at which samples are collected, shall be reported.

ATTACHMENT E – MRP

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U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

C. Whole Effluent Toxicity Testing Requirements
Whole effluent toxicity (WET) refers to the overall aggregate toxic effect of an effluent
measured directly by an aquatic toxicity test(s). The control of WET is one approach this
Order uses to control the discharge of toxic pollutants. WET tests evaluate the 1) aggregate
toxic effects of all chemicals in the effluent including additive, synergistic, or antagonistic
toxicity effects; 2) the toxicity effects of unmeasured chemicals in the effluent; and 3)
variability in bioavailability of the chemicals in the effluent.
Monitoring to assess the overall toxicity of the effluent is required to answer the following
questions:
(1) Does the effluent comply with permit effluent limitations for toxicity thereby ensuring that
water quality standards are achieved in the receiving water?
(2) If the effluent does not comply with permit effluent limitations for toxicity, are unmeasured
pollutants causing risk to aquatic life?
(3) If the effluent does not comply with permit effluent limitations for toxicity, are pollutants in
combinations causing risk to aquatic life?
The Discharger shall monitor the effluent at Monitoring Location EFF-001 as follows:
Table E-4. Whole Effluent Toxicity Testing
Monitoring
Location

Test

EFF-001

Screening
period for
chronic toxicity
Chronic Toxicity
Acute Toxicity

Unit

Sample Type

TUc

24-hr Composite

TUc
TUa

24-hr Composite
24-hr Composite

Minimum Test
Frequency
Every other year for 3
months, beginning with
the calendar year 2014
1/Week
1/Week

Acute toxicity testing shall be performed using either a marine fish or invertebrate species in
accordance with procedures established by the USEPA guidance manual, Methods for
Measuring the Acute Toxicity of Effluents and Receiving Waters to Freshwater and Marine
Organisms, 5th Edition, October 2002 (EPA-821-R-02-012).
Critical life stage toxicity tests shall be performed to measure chronic toxicity. Testing shall be
performed using methods outlined in Short-Term Methods for Estimating the Chronic Toxicity
of Effluent and Receiving Waters to West Coast Marine Estuarine Organisms (Chapman,
G.A., D.L. Denton, and J.M. Lazorchak, 1995) or Procedures Manual for Conducting Toxicity
Tests Developed by the Marine Bioassay Project (State Water Board, 1996).
A screening period for chronic toxicity shall be conducted every other year, beginning with the
calendar year 2014. Each screening period shall consist of 3 WET tests, conducted once per
month for three consecutive months, with each WET test using a minimum of three test
species with approved test protocols, from the following list (from the Ocean Plan). Repeat
screening periods may be terminated after the first month if the most sensitive species is the
same as the species previously found to be most sensitive. Other tests may be used, if they
have been approved for such testing by the State Water Board. The test species shall include
a fish, an invertebrate, and an aquatic plant. After the screening period, the most sensitive test
species shall be used for the weekly testing. The regular minimum test frequency for chronic
toxicity of once per week shall continue prior to, during, and after each screening period.
Control and dilution water should be receiving water or lab water as appropriate. If the dilution
water is different from the culture water, then culture water should be used in a second
control. The sensitivity of the test organisms to a reference toxicant shall be determined
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U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

concurrently with each bioassay test and reported with test results. The Discharger shall
follow the requirements under Special Provisions, section VI.C.2.e of this Order if any effluent
limitations for toxicity are exceeded.
Table E-5. Approved Test for Chronic Toxicity
Species
giant kelp, Macrocystis pyrifera
red abalone, Haliotis rufescens
oyster, Crassostrea gigas; mussels, Mytilus
spp.
urchin, Strongylocentrotus purpuratus; sand
dollar, Dendraster excentricus
urchin, Strongylocentrotus purpuratus; sand
dollar, Dendraster excentricus
Mysid shrimp, Holmesimysis costata
Mysid shrimp, Mysidopsis bahia

1
2

Test
percent germination; germ tube
length
abnormal shell development
abnormal shell development;
percent survival

Tier 1

Reference2

1

a, c

1

a, c

1

a, c

percent normal development

1

a, c

percent fertilization

1

a, c

percent survival; growth
1
a, c
percent survival; fecundity
2
b, d
larval growth rate; percent
topsmelt, Atherinops affinis
1
a, c
survival
larval growth rate; percent
Silversides, Menidia beryllina
2
b, d
survival
First tier methods are preferred for compliance monitoring. If first tier organisms are not available,
the Discharger can use a second tier test method following approval by the San Diego Water Board.
Protocol References:
a. Chapman, G.A., D.L. Denton, and J.M. Lazorchak. 1995. Short-term Methods for Estimating the
Chronic Toxicity of Effluents and Receiving Waters to West Coast Marine and Estuarine
Organisms. USEPA Report No. EPA/600/R-95/136.
b. Klemm, D.J., G.E. Morrison, T.J. Norberg-King, W.J. Peltier, and M.A. Heber. 1994. Short-term
Methods for Estimating the Chronic Toxicity of Effluents and Receiving Water to Marine and
Estuarine Organisms. USEPA Report No. EPA-600-4-91-003.
c. SWRCB 1996. Procedures Manual for Conducting Toxicity Tests Developed by the Marine
Bioassay Project. 96-1WQ.
d. Weber, C.I., W.B. Horning, I.I., D.J. Klemm, T.W. Nieheisel, P.A. Lewis, E.L. Robinson, J.
Menkedick and F. Kessler 9eds). 1998. Short-term Methods for Estimating the Chronic Toxicity
of Effluents and Receiving Waters to Marine and Estuarine Organisms. EPA/600/4-87/028.
National Information Service, Springfield, VA.

D. Land Discharge Monitoring Requirements – Not Applicable
E. Recycling Monitoring Requirements – Not Applicable
IV.

RECEIVING WATER MONITORING REQUIREMENTS
The receiving water and sediment monitoring requirements set forth below are designed to
measure the effects of the SBOO discharge on the receiving ocean waters. The overall receiving
water monitoring program is intended to answer the following questions:
(1) Does the receiving water meet water quality standards?
(2) Are the receiving water conditions getting better or worse over time?
(3) What is the relative contribution of the Facility discharge to pollution in the receiving water?
Receiving water and sediment monitoring in the vicinity of the SBOO shall be conducted as
specified below. This program is intended to document conditions within the waste field in the
vicinity of the zone of initial dilution (ZID) boundary, at reference stations, and at areas beyond

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U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

the ZID where discharge impacts might be reasonably expected. Station location, sampling,
sample preservation and analyses, when not specified, shall be by methods approved by the San
Diego Water Board. The monitoring program may be modified by the San Diego Water Board at
any time. The Discharger may also submit a list of proposed changes with supporting rationale to
these monitoring requirements that it considers to be appropriate to the San Diego Water Board
for approval.
The receiving water and sediment monitoring program for the SBOO may be conducted jointly
with other dischargers to the SBOO.
During monitoring events sample stations shall be located using a land-based microwave
positioning system or a satellite positioning system such as global positioning system (GPS). If an
alternate navigation system is proposed, its accuracy should be compared to that of microwave
and satellite based systems, and any compromises in accuracy shall be justified.
In the event that the Discharger is unable to obtain a sample from a monitoring station(s) located
in Mexico, due to safety, legal, or other reasons, collection of samples at such station(s) can be
omitted. In the event that a monitoring location is omitted, the Discharger shall submit a statement
to the San Diego Water Board containing, at a minimum, the following information:
1. The monitoring station(s) that was omitted;
2. The date the monitoring station was omitted; and
3. A description of the circumstances for omitting the collection of data at the monitoring station.
A. Shoreline Water Quality Monitoring Requirements
As ocean surface waves come closer to shore they break, forming the foamy, bubbly surface
called surf. The region of breaking waves defines the shoreline.
Monitoring of the shoreline is intended to answer the following questions:
(1) Does the effluent cause or contribute to an exceedance of the water quality standards in
the receiving water?
(2) Does the effluent reach water contact zones or commercial shellfish beds?
(3) Are densities of bacteria in water contact areas below levels protective of public health?
All shoreline stations shall be monitored as follows:
Table E-6. Shoreline Monitoring Requirements2
Parameter
Visual Observations
Temperature
Total and Fecal Coliforms;
Enterococcus3

Units
-°C

Stations
S0, S2-S6, S8-S12
S0, S2-S6, S8-S12

Sample Type
Visual
Grab

Sampling Frequency

colony
forming
units

S0, S2-S6, S8-S12

Grab

1/Week

1

1/Week

(CFU)/100
mL

1

2.
3.

Visual observations of the surface water conditions at the designated receiving water stations shall be conducted in
such a manner as to enable the observer to describe and report the presence, if any, of floatables of sewage origin.
Observations of wind (direction and speed), weather (cloudy, sunny, or rainy), direction of current, tidal conditions
(high or low), water color, discoloration, oil and grease, turbidity, and odor shall be recorded. These observations
shall be taken whenever a sample is collected. Visual observations shall also be conducted for repeat sampling.
See Attachment A for definitions of abbreviations and a glossary of common terms used in this Order.
If a single sample exceeds any of the single sample maximum (SSM) bacterial standards contained in section
V.A.1.a.ii of this Order, repeat sampling at that location shall be conducted to determine the extent and persistence of

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U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

the exceedance. Repeat sampling shall be conducted within 24 hours of receiving analytical results and continued
until the sample result is less than the SSM standard or until a sanitary survey is conducted to determine the source
of the high bacterial densities.

When repeat sampling is required because of an exceedance of any one single sample density, values
from all samples collected during that 30-day period will be used to calculate the geometric mean.
Repeat sampling is not required for the stations located in Mexico.

Sample Station Omission Due to Storm Condition (including required repeat sampling).
In the event of stormy weather which makes sampling hazardous at certain shoreline stations,
collection of samples at such stations can be omitted, provided that such omissions do not
occur more than 5 days in any calendar year or occur at consecutive sampling times, or
provided that a written request from the Discharger is approved by the Executive Officer in
writing. The visual observations listed in footnote no. 1 above shall still be recorded and
reported to the San Diego Water Board for these stations at the time the sample was
attempted to be collected. If practicable, an effort should be made to return to the sampling
station that was omitted and collect the sample during calmer conditions within the same
reporting period.
B. Offshore Water Quality Monitoring Requirements
Offshore monitoring extends from south of the international border to Point Loma. See
Attachment B for a map of the offshore monitoring stations.
Offshore monitoring is necessary to answer the following questions:
(1) Is natural light significantly reduced at any point outside the ZID as a result of the
discharge?
(2) Does the discharge cause a discoloration of the ocean surface?
(3) Does the discharge of oxygen demanding waste cause the dissolved oxygen
concentration to be depressed at any time more than 10 percent from that which occurs
naturally outside the ZID?
(4) Does the discharge of waste cause the pH to change at any time more than 0.2 units from
that which occurs naturally outside the ZID?
(5) Is the wastewater plume encroaching upon receiving water areas used for swimming,
surfing, diving and shellfish harvesting?
(6) What is the fate of the discharge plume?
1.

Offshore receiving water monitoring shall be conducted as follows:
Table E-7. Offshore and Kelp/Nearshore Monitoring Requirements

Parameter

Units

Visual Observations
Temperature and Depth4
pH4
Salinity4
Dissolved Oxygen4
Light Transmittance4
Chlorophyll a4
Total Coliforms
Fecal Coliforms
Enterococcus

-°C, feet
units
parts per thousand
mg/L
Percent
ug/L
CFU/100 mL
CFU/100 mL
CFU/100 mL

ATTACHMENT E – MRP

Sample
Type
Visual
Profile
Profile
Profile
Profile
Profile
Profile
Grab
Grab
Grab

Sampling Frequency1,2
Offshore
Kelp/Nearshore
3

3

1/Quarter
1/Quarter
1/Quarter
1/Quarter
1/Quarter
1/Quarter
1/Quarter
1/Quarter
1/Quarter

1/Week
1/Week
1/Week
1/Week
1/Week
1/Week
1/Week
1/Week
1/Week

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South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

1 Quarterly receiving water monitoring results shall be submitted within the monthly SMR for the month in which the monitoring
was conducted.
2 Shall be monitored at all applicable discrete depths specified for bacterial monitoring in Table E-1 of this MRP.
3 Visual observations of the surface water conditions at the designated receiving water stations shall be conducted in such a
manner as to enable the observer to describe and report the presence, if any, of floatables of sewage origin. Observations
of wind (direction and speed), weather (cloudy, sunny, or rainy), direction of current, tidal conditions (high or low), water
color, oil and grease, turbidity, and odor shall be recorded. These observations shall be taken whenever a sample is
collected.
4 Temperature, depth, pH, salinity, dissolved oxygen, light transmittance, and chlorophyll a profile data shall be measured
throughout the entire water column during the quarterly and weekly sampling events.

Sample Station Omission Due to Storm Condition. In the event of stormy weather which
makes sampling hazardous at certain offshore stations, collection of samples at such
stations can be omitted, provided that such omissions do not occur more than 5 days in
any calendar year or occur at consecutive sampling times, or provided that a written
request from the Discharger is approved by the Executive Officer in writing. The visual
observations listed in footnote no. 1 above shall still be recorded and reported to the San
Diego Water Board for these stations at the time the sample was attempted to be
collected. If practicable, an effort should be made to return to the sampling station that
was omitted and collect the sample during calmer conditions within the same reporting
period.
2.

Plume Tracking
a.

Plume Tracking Monitoring Plan (PTMP). By March 30, 2018, the Discharger shall,
in consultation with the San Diego Water Board, prepare and submit a PTMP to
implement an ongoing program designed to map dispersion and fate of the
wastewater plume discharged from the SBOO. The PTMP shall include, but is not
limited to, the following elements.
i.

ii.

Development of a work plan or pilot study (special study) for implementation of
the SBOO real-time mooring system, including data acquisition and processing.

iii.

Networking the SBOO system to be compatible with a similar system being
deployed by the Discharger near the Point Loma Ocean Outfall (PLOO)
discharge site, as well as a third system operated by the University of California
San Diego, Scripps Institution of Oceanography in the coastal waters off the
City of Del Mar.

iv.

b.

Installation and operation by the Discharger of a permanent, real-time
oceanographic mooring system located near the terminal diffuser wye structure
of the SBOO. The mooring system shall be designed to measure, at minimum,
direction and velocity of subsurface currents, and ocean stratification.

Development of a work plan or pilot study (special study) for utilizing advanced
oceanographic sampling technologies such as an autonomous underwater
vehicle (AUV) or remotely operated towed vehicle (ROTV) in conjunction with
the SBOO real-time mooring system to enhance collection of water quality data
in real-time and provide higher resolution maps of plume location and
movement.

Plume Tracking Implementation. The Discharger shall implement the PTMP within
sixty (60) days after submission in accordance with the scheduled contained in the
PTMP unless otherwise directed by the San Diego Water Board.

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U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

c.

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Plume Tracking Reporting. The Discharger shall submit reports to the San Diego
Water Board on the SBOO real-time mooring system and associated pilot studies
(e.g., AUV/ROTV surveys) biennially in accordance with the due dates specified in
Table E-11 for the Biennial Receiving Waters Monitoring and Assessment Report.
These reports shall include in-depth discussion, evaluation, interpretation, and
tabulation of the real-time mooring and other project data. Report interpretations
and conclusions shall include the state of the receiving waters into which the SBOO
discharges and the estimated location of the SBOO plume throughout the reporting
period, Additional project progress reports may also be required per approved work
plan schedules.

C. Benthic Monitoring Requirements
Seafloor sediments integrate constituents that are discharged to the ocean. Most particles that
come from the SBOO discharge, and any associated contaminants, will eventually settle to
the seafloor where they are incorporated into the existing sediments. Sediments can
accumulate these particles over the years until the point where sediment quality is degraded
and beneficial uses are impaired.
Benthic organisms are strongly affected by sediment contaminant exposure because these
organisms often live in continual direct contact with sediment/pore water, and many species
ingest significant quantities of sediment as a source of nutrition. Because the benthos are
dependent on their surroundings, they serve as a biological indicator that reflects the overall
conditions of the aquatic environment.
The assessment of sediment quality with respect to sediment chemistry, sediment toxicity and
benthic community condition is necessary to answer the following questions:
(1) Is the dissolved sulfide concentration of waters in sediments significantly increased
above that present under natural conditions?
(2) Is the concentration of substances, set forth in Table 1 of the Ocean Plan for
protection of marine aquatic life, in marine sediments at levels which would degrade
the benthic community?
(3) Is the concentration of organic pollutants in marine sediments at levels that would
degrade the benthic community?
(4) Are benthic communities degraded as a result of the discharge?
(5) Is the sediment quality changing over time?
The assessment of sediment quality to evaluate potential effects of the SBOO discharge and
compliance with narrative water quality standards specified in the Ocean Plan consist of the
measurement and integration of three lines of evidence: 1) physical and chemical properties
of seafloor sediments, 2) seafloor sediment toxicity to assess bioavailability and toxicity of
sediment contaminants, and 3) ecological status of the biological communities (benthos) that
live in or on the seafloor sediments.
1.

Sediment Assessment for Physical and Chemical Properties
a. Sediment Sampling Stations and Monitoring Frequency. The core sediment
monitoring program is designed to assess spatial and temporal trends at 27 of the
offshore stations listed in Table E-1, including 12 primary stations located along the
outfall discharge depth contour (i.e., stations I2, I3, I6, I9, I12, I14, I15, I16, I22, I27,
I30, I33) and 15 secondary stations located at other depths (i.e., stations I1, I4, I7, I8,
I10, I13, I18, I20, I21, I23, I28, I29, I31, I34, I35). At the discretion of the San Diego

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U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Water Board, the requirement for sampling the secondary stations may be relaxed to
allow Discharger participation in Southern California Bight Regional Monitoring
efforts, or to reallocate resources to accommodate approved Strategic Process
Studies. Sediment samples shall be collected twice per year during the Winter (e.g.,
January) and Summer (e.g., July) at each of the 27 offshore stations described
above and in Table E-1 in order to assess benthic habitat condition in terms of
physical and chemical composition (e.g., grain-size distribution, sediment chemistry).
b. Sediment Sample Collection Methods. Sediment samples shall be taken using a
0.1-square meter modified Van Veen grab sampler. Samples for grain-size and
chemical analyses shall be collected from within the upper two centimeters of the
surface sediment. Bulk sediment chemical analysis shall include at a minimum the
set of constituents listed in Table E-8 below.
c. Sediment Chemistry. Sediment chemistry is the measurement of the concentration
of chemicals of concern in sediments. The chemistry line of evidence is used to
assess the potential overall exposure risk to benthic organisms from pollutants in
surficial sediments. Chemical analysis of sediment shall be conducted using USEPA
approved methods, methods developed by the National Oceanic and Atmospheric
Administration’s (NOAA’s) National Status and Trends for Marine Environmental
Quality, or methods developed in conjunction with the Southern California Bight
Regional Monitoring Program. For chemical analysis of sediment, samples shall be
reported on a dry weight basis.
Sediment monitoring for physical and chemical properties shall be conducted at the 27
offshore benthic stations listed above in Section IV.C.1.a of this MRP as follows:
Table E-8. Sediment Monitoring Requirements
Determination
Sediment grain size
Total Organic Carbon
Total Nitrogen
Acid Volatile Sulfides
Aluminum
Antimony
Arsenic
Cadmium
Chromium
Copper
Iron
Lead
Manganese
Mercury
Nickel
Selenium
Silver
Tin
Zinc
PCBs
2,4-DDD
4,4-DDD
2,4-DDE
4,4-DDE
2,4-DDT
ATTACHMENT E – MRP

Units
μm
Percent
Percent
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
ng/kg
ng/kg
ng/kg
ng/kg
ng/kg
ng/kg

Type of Sample
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab

Minimum Frequency
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
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U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant
Determination
4,4-DDT
Aldrin
Alpha-Chlordane
Dieldrin
Endosulfan
Endrin
Gamma-BHC
Heptachlor
Heptachlor Epoxide
Hexachlorobenzene
Mirex
Trans-Nonachlor
Acenapthene
Acenaphthylene
Anthracene
Benzo(a)anthracene
Benzo(o)fluoranthene
Benzo(k)fluoranthene
Benzo(ghi)pyrelene
Benzo(a)pyrene
Benzo(e)pyrene
Biphenyl
Chrysene
Dibenz(ah)anthraces
Fluoranthene
Fluorene
Ideno(123cd)pyrene
Naphthalene
1-Methylnaphthalene
2-Methylnaphthalene
2,6Dimethylnaphthalene
2,3,5Trimethylnaphthale
Perylene
Phenanthrene
1-Methylphenanthene
Pyrene

2.

Units
ng/kg
ng/kg
ng/kg
ng/kg
ng/kg
ng/kg
ng/kg
ng/kg
ng/kg
ng/kg
ng/kg
ng/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Type of Sample
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab

Minimum Frequency
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year
2/Year

Sediment Toxicity
a. Sediment Toxicity Monitoring Plan. Sediment toxicity is a measure of the
response of invertebrates exposed to surficial sediments under controlled laboratory
conditions. The sediment toxicity line of evidence is used to assess both pollutant
related biological effects and exposure. Within 180 days of the effective date of this
permit, the Discharger shall, in consultation with the City of San Diego, the San
Diego Water Board, and the State Water Board, prepare and submit a Sediment
Toxicity Monitoring Plan to implement an on-going acute sediment toxicity monitoring
program in conformance with the requirements of Ocean Plan Appendix III, Standard
Monitoring Procedures, Aquatic Life Toxicity. The Monitoring Plan shall include the
following elements:

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U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

i.

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Quality Assurance Project Plan. An ELAP approved Quality Assurance Project
Plan (QAPP) describing the project objectives and organization, functional
activities, and quality assurance/quality control protocols for the sediment
monitoring.

ii. Toxicity Testing Protocols. The Ocean Plan requires that acute toxicity testing be
conducted utilizing alternative amphipod species (Eohaustorius estuarius,
Leptocheirus plumulosus, Rhepoxynius abronius).
iii. Spatial Representation. The Sediment Toxicity Monitoring Plan shall be
designed to ensure that the sample stations are spatially representative of the
sediment within the region of interest. The locations, type, and number of
samples shall be identified and shown on a map
iv. Existing Data and Information. The Sediment Toxicity Monitoring Plan design
shall take into consideration existing data and information of appropriate quality.
v. Monitoring Frequency. The Sediment Toxicity Monitoring Plan shall include a
schedule for all sample collection and analysis and reporting of results to the San
Diego Water Board.
vi. Analysis. The Sediment Toxicity Monitoring Plan shall provide for evaluation,
interpretation and tabulation of the sediment monitoring data including
interpretations and conclusions as to whether applicable Receiving Water
Limitations in this Order have been attained at each sample station.
b. Sediment Toxicity Monitoring Plan Implementation. The Discharger shall
implement the Sediment Toxicity Monitoring Plan sixty (60) days after submission in
accordance with the schedule contained in the Sediment Toxicity Monitoring Plan
unless otherwise directed in writing by the San Diego Water Board. Before
beginning sample collection activities, the Discharger shall comply with any
conditions set by the San Diego Water Board.
3.

Benthic Community Condition
a. Benthic Community Sampling Stations and Frequency. Sediment samples for
assessment of benthic community structure shall be collected twice per year during
Winter (e.g., January) and Summer (e.g., July) at each of the 27 offshore stations
described above for sediments. One sample per station shall be collected for
analysis of benthic community structure.
b. Benthic Community Sample Collection Methods. Benthic community samples
shall be collected using the guidance specified in the most recent field manual
developed for the Southern California Bight Regional Monitoring Program. The
benthic samples shall be collected using a 0.1-square meter modified Van Veen grab
sampler. These grab samples shall be separate from (but adjacent to as much as
possible) samples collected for sediment grain-size and chemistry analyses. The
samples shall be sieved using a 1.0-millimeter mesh screen. The benthic organisms
retained on the sieve shall be fixed in 10 percent buffered formalin, and transferred
to at least 70 percent ethanol within two to seven days of storage. Benthic
organisms, obtained during benthic monitoring shall be counted and identified to as
low a taxon as possible.
c. Benthic Community Analysis. Analysis of benthic community structure shall
include determination of the number of species, number of individuals per species,

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Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

and total numerical abundance present. The following parameters or metrics shall be
calculated for each 0.1-square meter grab sample and summarized by station as
appropriate.
i.

Number of species

ii.

Total numerical abundance

iii.

Benthic Response Index (BRI)

iv.

Swartz’s 75 percent dominance index

v.

Shannon-Weiner’s diversity index (H)

vi.

Pielou eveness index (J)

In addition to summarizing the above community structure parameters at each
station, a more rigorous assessment shall be performed as detailed in this MRP,
section IV.E.
d. Benthic Random Sampling. This MRP, the MRP for the PLOO, and the MRP for
the South Bay Water Reclamation Plant (SBWRP)1 require the City of San Diego
and the Discharger to sample and analyze annually for sediment chemistry and
benthic community conditions at an additional array of 40 randomly selected stations.
The same sampling and processing procedures must be followed as outlined above
for core benthic sediment and benthic community condition monitoring. These
stations shall be reselected each year by USEPA or their designee to meet the
requirements for this MRP, the MRP for the PLOO, and the MRP for the SBWRP
using the USEPA probability-based Environmental Monitoring and Assessment
Program (EMAP) design. The area of coverage shall extend from the mouth of the
San Dieguito River south to the USA/Mexico border.
The random benthic sampling requirement may be suspended as part of a resource
exchange agreement to allow for participation in the Southern California Bight
Regional Monitoring Surveys at the discretion of the Executive Officer as specified in
section II.R of this Order.

1

Order No. R9-2017-0007, NPDES No. CA0107409, Waste Discharge Requirements and National Pollutant
Discharge Elimination System Permit for the City of San Diego E.W. Blom Point Loma Wastewater Treatment
Plant Discharge to the Pacific Ocean through the Point Loma Ocean Outfall, Monitoring and Reporting
Program (Attachment E)
Order No. R9-2013-0006 as amended by Order Nos. R9-2014-0071 and R9-2017-0023, NPDES Permit No.
CA0109045, Waste Discharge Requirements for the City of San Diego South Bay Water Reclamation Plant,
Discharge to the Pacific Ocean via the South Bay Ocean Outfall, Monitoring and Reporting Program
(Attachment E)

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D.

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Fish and Invertebrate Monitoring Requirements
Many pollutants discharged into receiving waters have the potential to bioaccumulate and
persist in tissues of aquatic organisms, including marine fishes. Chemical pollutants that
bioaccumulate tend to magnify in concentration as they pass through the aquatic food chain.
Therefore, fish monitoring data is required to assess the human health risks for individuals
who may consume fish and to assess trends of contaminants levels in the receiving water
over time.
Aquatic invertebrates are excellent indicators of ecosystem health because they are
ubiquitous, abundant, diverse, and typically sedentary. The growth, survival, and reproduction
of many species of aquatic invertebrates are all sensitive to changes in environmental health,
making analysis of assemblage structure a good ecosystem monitoring tool.
Fish and invertebrate monitoring is necessary to answer the following questions:
(1) Does the concentration of pollutants in fish, shellfish, or other marine organisms used
for human consumption bioaccumulate to levels that are harmful to human health?
(2) Does the concentration of pollutants in marine life bioaccumulate to levels that
degrade marine communities?
(3) Are the concentrations of pollutants in fish and other marine organisms changing over
time?
(4) Is the health of fish changing over time?
(5) Are the populations of selected species of fish and invertebrates changing over time?
1.

Fish and Invertebrate Trawls
a.

Fish and Invertebrate Trawl Frequency and Monitoring Stations. Epibenthic
trawls shall be conducted to assess the structure of demersal fish and megabenthic
invertebrate communities, while the presence of priority pollutants in fish will be
analyzed from species captured using both trawling and rig fishing techniques (see
section IV.D.2 for more information). Single community trawls for fish and
invertebrates shall be conducted semi-annually in the winter (e.g., January) and
summer (e.g., July) at seven trawl stations designated SD15–SD21 at the locations
specified in Table E-1. These stations represent two areas near Discharge Point No.
001 (stations SD-17 and SD-18), two areas up coast of Discharge Point No. 001
(stations SD-19, SD-20, and SD-21), and two areas down coast of Discharge Point
No. 001 (stations SD 15 and SD-16). Trawls shall be conducted using a Marinovich
7.62 m (25 ft) head rope otter trawl, using the guidance specified in the most recent
field manual developed for the Southern California Bight Regional Monitoring
Program. All trawl-captured fishes and megabenthic invertebrates shall be identified
at each station.
In order to minimize negative impacts that may occur due to unsuccessful trawling
efforts associated with unusual environmental conditions, the requirement to
conduct trawls during any given period may be postponed or waived at the
discretion of the Executive Officer of the San Diego Water Board, in concurrence
with USEPA, upon receipt of written justification provided by the Discharger.
Examples of such unusual events include the presence of large populations of
pelagic red crabs (Pleuroncodes planipes) associated with El Niño and the
occurrence of large squid egg masses that prevent hauling in the trawl nets.

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Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

b.

Fish and Invertebrate Community Structure Analysis. All fish and megabenthic
invertebrates collected by trawls should be identified to species if possible. For fish,
community structure analysis shall consist of determining the standard length and
total wet weight, total number of individuals per species, the total numerical
abundance of all fish, species richness, species diversity (H'), and multivariate
pattern analyses (e.g., ordination and classification analyses). The presence of any
physical abnormalities or disease symptoms (e.g., fin erosion, external lesions,
tumors) or external parasites shall also be recorded. For invertebrates, community
structure shall be summarized as the total number of individuals per species, the
total numerical abundance of all invertebrates, species richness, and species
diversity (H').

c.

Fish Tissue Chemical Analysis. Chemical analyses of fish tissues shall be
performed annually (e.g., during October) on target species collected at or near the
trawl stations. The seven stations are classified into five zones for the purpose of
collecting sufficient numbers of fish for tissue analyses. Trawl Zone 5 represents the
nearfield zone, defined as the area within a 1-km radius of stations SD-17 and/or
SD-18; Trawl Zone 6 represents the north farfield zone, defined as the area within a
1-km radius of stations SD-19 and/or SD-20; Trawl Zone 7 represents the far-north
farfield zone, defined as the area within a 1-km radius of station SD-21; Trawl Zone
8 represents the south farfield zone, defined as the area within a 1-km radius of
station SD-16; Trawl Zone 9 represents the far-south farfield zone, defined as the
area within a 1-km radius of station SD-15. There are no depth requirements for
these five zones with regards to the collection of fishes for tissue analysis.
Liver tissues shall be analyzed during each survey from fishes collected in each of
the above five trawl zones. No more than a maximum of five 10-minute (bottom
time) trawls shall be required per zone in order to acquire sufficient numbers of fish
for composite samples; these trawls may occur anywhere within a defined zone. If
sufficient numbers of trawl zone target species cannot be, or are unlikely to be,
captured by trawling, fish for tissue analysis from these areas may be collected
using alternative methods such as those described below under Rig Fishing in
section IV.D.2.b of this MRP (e.g., hook and line, baited lines). Three replicate
composite samples shall be prepared from each trawl zone, with each composite
consisting of tissues from at least three individual fish of the same species. These
liver tissues shall be analyzed for the constituents listed in Table E-9 below.
Table E-9. Fish Tissue Monitoring Requirements

Determination
Total Lipids
Aluminum
Antimony
Arsenic
Cadmium
Chromium
Copper
Iron
Lead
Manganese
Mercury
Nickel
Selenium
ATTACHMENT E – MRP

Units
µg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg
mg/kg

Type of Sample
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Composite

Minimum Frequency
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
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Determination
Silver
Tin
Zinc
PCBs
2,4-DDD
4,4-DDD
2,4-DDE
4,4-DDE
2,4-DDT
4,4-DDT
Aldrin
Alpha-Chlordane
Dieldrin
Endosulfan
Endrin
Gamma-BHC
Heptachlor
Heptachlor Epoxide
Hexachlorobenzene
Mirex
Trans-Nonachlor
Acenapthene
Acenaphthylene
Anthracene
Benzo(a)anthracene
Benzo(o)fluoranthene
Benzo(k)fluoranthene
Benzo(ghi)pyrelene
Benzo(a)pyrene
Benzo(e)pyrene
Biphenyl
Chrysene
Dibenz(ah)anthraces
Fluoranthene
Fluorene
Ideno(123cd)pyrene
Naphthalene
1-Methylnaphthalene
2-Methylnaphthalene
2,6Dimethylnaphthalene
2,3,5Trimethylnaphthale
Perylene
Phenanthrene
1-Methylphenanthene
Pyrene

d.

Units
mg/kg
mg/kg
mg/kg
µg/kg
µg/kg
µg/kg
µg/kg
µg/kg
µg/kg
µg/kg
µg/kg
µg/kg
µg/kg
µg/kg
µg/kg
µg/kg
µg/kg
µg/kg
µg/kg
µg/kg
µg/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg
μg/kg

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Type of Sample
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Composite
Composite

Minimum Frequency
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual
Annual

Composite

Annual

Composite
Composite
Composite
Composite

Annual
Annual
Annual
Annual

Fish Targeted for Analysis. The species of fish targeted for tissue analysis from
the trawl sites shall be primarily flatfish, including, but not limited to, Pacific sanddab
(Citharichthys sordidus), longfin sanddab (Citharichthys xanthostigma), bigmouth

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Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

sole (Hippoglossina stomata), and hornyhead turbot (Pleuronichthys verticalis). If
sufficient numbers of these primary flatfish species are not present in a zone,
secondary candidate species such as the California scorpionfish (Scorpaena
guttata) and halfbanded rockfish (Sebastes semicinctus) may be collected as
necessary.
2.

Rig Fishing
a.

Rig Fishing Frequency. Muscle tissues shall be analyzed annually (e.g., during
October) from fishes collected in each of the two rig fishing zones described below
in order to monitor the uptake of pollutants in species and tissues that are
consumed by humans.

b.

Rig Fishing Method and Location. The fish shall be collected by hook and line or
by setting baited lines from within zones surrounding rig fishing stations RF-3 and
RF-4 listed in Table E-1. Rig Fishing Zone 3 is the nearfield (near ZID) area
centered within a 1-km radius of station RF-3; Rig Fishing Zone 4 is considered the
farfield area centered within a 1-km radius of station RF-4. There are no depth
requirements for these two zones with regards to the collection of fishes for tissue
analysis. The species targeted for muscle tissue analysis in the rig fishing stations
shall be representative of those caught by recreational and/or commercial fishery
activities in the region. The species targeted for muscle tissue analysis shall be
primarily rockfish, which may include, but are not limited to, the vermilion rockfish
(Sebastes miniatus) and the copper rockfish (Sebastes caurinus). If sufficient
numbers of these primary species are not present or cannot be caught in a
particular zone, secondary target species (e.g., other rockfish, scorpionfish) may be
collected and analyzed as necessary. Fish samples shall be identified to species,
with number of individuals per species, standard length and wet weight recorded.
Physical abnormalities and disease symptoms shall be recorded and itemized (e.g.,
fin rot, lesions, and tumors).

c.

Rig Fishing Collection. Three replicate composite samples of the target species
shall be obtained from each zone, with each composite consisting of a minimum of
three individual fish. Muscle tissue shall be chemically analyzed for the same set of
constituents as trawl-caught fish specified in Table E-9 above.

E. Receiving Water Monitoring Reports
1.

The Discharger shall submit Interim and Biennial Receiving Water Monitoring Reports to
the San Diego Water Board. The Interim Receiving Water Monitoring Reports will cover
only one year of receiving water monitoring (e.g., separate reports for calendar years 2016,
2018, and 2020), will only cover even numbered years, and shall be submitted every other
year. The Biennial Receiving Water Monitoring Reports will provide a more thorough
discussion, evaluation (e.g., detailed statistical analyses), and interpretation than the
Interim Receiving Water Monitoring Reports, will cover two years of receiving water
monitoring (e.g., biennial reports for calendar years 2016-2017, 2018-2019, and 20202021), and shall be submitted the opposite years as the Interim Receiving Water Monitoring
Reports. These reports are described below under sections VIII.E.2 and VIII.E.3 and cover
the following monitoring requirements:
a.

Shoreline, offshore, and kelp monitoring (sections IV.A and IV.B.1 of this MRP);

b.

Sediment chemistry (section IV.C.1 of this MRP);

c.

Sediment toxicity (section IV.C.2 of this MRP);

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Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

d.
e.

Fish and invertebrate trawls (section IV.D.1 of this MRP);

f.

Rig fishing (section IV.D.2 of this MRP); and

g.
2.

Benthic community (section IV.C.3 of this MRP);

Plume tracking (section IV.B.2 of this MRP).

The Discharger shall submit Interim Receiving Water Monitoring Reports (Interim Reports,
executive summary) as specified in Table E-11, section IV.B of this MRP. The Interim
Reports will cover the first “even” year in each biennial reporting cycle as described below
in section IV.E.3 (e.g., separate reports for calendar years 2016, 2018, and 2020). The
Interim Reports may be submitted as an integrated report covering both the receiving water
monitoring required in this MRP, the MRP for the PLOO, and the MRP for the SBWRP (as
required under separate waste discharge requirements (WDRs)). The Interim Reports shall
include, as a minimum, the following information:
a.

b.

A description of sampling stations, including, if such information is available,
differences unique to each station (e.g., station location, sediment grain size,
distribution of bottom sediments, rocks, shell litter, calcareous worm tubes, etc.);

c.

A description of the sample collection and preservation procedures used in the survey;

d.

A description of the specific method used for laboratory analysis;

e.

A tabulation of the data; and

f.
3.

A description of climatic and receiving water characteristics at the time of sampling
(weather observations, floating debris, discoloration, wind speed and direction, swell or
wave action, time of sampling, tide height, etc.);

A narrative summary of general observations, including any abnormal conditions.

The Discharger shall submit Biennial Receiving Water Monitoring and Assessment Reports
(Biennial Reports, full assessment) as specified in Table E-11, section VIII.B of this MRP.
These Biennial Reports will each cover a full 2-year monitoring cycle beginning with evennumbered years (e.g., biennial reports for calendar years 2016-2017, 2018-2019, 20202021). The Biennial Reports may be submitted as an integrated report covering both the
receiving water monitoring required in this MRP, the MRP for the PLOO, and the MRP for
the SBWRP (as required under separate WDRs). The Biennial Reports shall include, as a
minimum, the following information:
a.

b.

A description of sampling stations, including, if such information is available,
differences unique to each station (e.g., station location, sediment grain size,
distribution of bottom sediments, rocks, shell litter, calcareous worm tubes, etc.);

c.

A description of the sample collection and preservation procedures used in the survey;

d.

A description of the specific method used for laboratory analysis; and

e.

4.

A description of climatic and receiving water characteristics at the time of sampling
(weather observations, floating debris, discoloration, wind speed and direction, swell or
wave action, time of sampling, tide height, etc.);

An in-depth discussion, evaluation (e.g., detailed statistical analyses), interpretation
and tabulation of the data including interpretations and conclusions as to whether
applicable receiving water limitations in this Order have been attained at each station.

During the same year that the Biennial Reports are submitted, the Discharger shall provide
a Biennial State of the Ocean Report (an oral report) to the San Diego Water Board

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Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

summarizing the conclusions of the Biennial Report over the 2-year monitoring period. If an
oral report cannot be scheduled for a San Diego Water Board meeting, the San Diego
Water Board may approve submission of a written Biennial State of the Ocean Report
instead. The Biennial State of the Ocean Report shall include, as a minimum, a description
of the monitoring effort completed during the past two years, the status and trends of
receiving waters quality conditions, and plans for future monitoring efforts.
V.

REGIONAL MONITORING REQUIREMENTS
Regional ocean water monitoring provides information about the sources, fates, and effects of
anthropogenic contaminants in the coastal marine environment necessary to make assessments
over large areas. The large scale assessments provided by regional monitoring describe and
evaluate cumulative effects of all anthropogenic inputs and enable better decision making
regarding protection of beneficial uses of ocean waters. Regional monitoring data assists in the
interpretation of core monitoring studies by providing a more accurate and complete
characterization of reference conditions and natural variability. Regional monitoring also leads to
methods standardization and improved quality control through intercalibration exercise. The
coalitions implementing regional monitoring enable sharing of technical resources, trained
personnel and associated costs. Focusing these resources on regional issues and developing a
broader understanding of pollutants effects in ocean waters enables the development of more
rapid and effective response strategies. Based on all of these considerations the San Diego Water
Board supports regional approaches to monitoring ocean waters.
The Discharger shall, as directed by the San Diego Water Board, participate with other regulated
entities, other interested parties, and the San Diego Water Board in development and
implementation of new and improved monitoring and assessment programs for ocean waters in
the San Diego Region and discharges to those waters. These programs shall be developed and
implemented so as to:
(1) Determine the status and trends of conditions in ocean waters in the San Diego
Region with regard to beneficial uses, e.g.,
i.

Are fish and shellfish safe to eat?

ii. Is water quality safe for swimming?
iii. Are ecosystems healthy?
(2) Identify the primary stressors causing or contributing to conditions of concern;
(3) Identify the major sources of the stressors causing or contributing to conditions of
concern; and
(4) Evaluate the effectiveness (i.e., environmental outcomes) of actions taken to address
such stressors and sources.
Development and implementation of new and improved monitoring and assessment programs for
ocean waters will be guided by the following:
1.

Water Quality Control Plan Ocean Waters of California (Ocean Plan);

2.

San Diego Water Board Resolution No. R9-2012-0069, “Resolution in Support of A
Regional Monitoring Framework;”

3.

San Diego Water Board staff report entitled “A Framework for Monitoring and
Assessment in the San Diego Region;” and

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4.
A.

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Other guidance materials, as appropriate.

Kelp Bed Canopy Monitoring Requirements
Kelp consists of a number of species of brown algae. Along the central and southern
California coast, giant kelp (Macrocystis pyrifera) is the largest species colonizing rocky, and
in some cases sandy, subtidal habitats. Giant kelp is an important component of coastal and
island communities in southern California, providing food and habitat for numerous animals.
Monitoring of the kelp beds is necessary to answer the following questions:
(1) What is the maximum areal extent of the coastal kelp bed canopies each year?
(2) What is the variability of the coastal kelp bed canopy over time?
(3) Are coastal kelp beds disappearing? If yes, what are factors that could contribute to
the disappearance?
(4) Are new coastal kelp beds forming?
The Discharger shall participate with other southern California ocean dischargers in an
ongoing regional survey of coastal kelp beds in the Southern California Bight. The intent of
these surveys is to provide an indication of the health of these kelp beds, recognizing that the
extent of kelp bed canopies may change due to variety of influences.
Kelp beds shall be monitored by means of vertical aerial infrared photography to determine
the maximum areal extent of the canopies of coastal kelp beds each year. Surveys shall be
conducted as close as possible to when kelp bed canopies are at their greatest extent during
the year. The entire San Diego Region coastline, from the international boundary to the San
Diego Region/Santa Ana Region boundary shall be photographed on the same day.
The maximum areal extent of kelp bed canopies each year shall be compared to that
observed in previous years. Any significant losses that persist for more than one year shall be
investigated by divers to document benthic and understory conditions.
The data, analyses, assessment, and images produced by the surveys shall be made
available in a user-friendly format on a website that is readily available to the public. In
addition to the kelp bed canopies, the images shall show onshore reference points, locations
of all ocean outfalls and diffusers, artificial reefs, areas of known hard-bottom substrate (i.e.,
rocky reefs), and depth contours at intervals of 30-feet mean lower low water (MLLW).
The surveys shall be conducted on a “continuous improvement” basis, i.e., each year
improvements shall be made in monitoring, analysis, assessment, and/or documentation. For
example, these could include:
1.

More sophisticated analysis of patterns, correlations, and cycles that may be related to
the extent of kelp bed canopies; or

2.

Projects to improve understanding of influences on kelp beds or of how the extent of the
canopies of various kelp beds has changed since the early 20th century.

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B.

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Southern California Bight Monitoring Program Participation Requirements
The Discharger is required to participate in the, Southern California Bight Regional Monitoring
Program coordinated by the Southern California Coastal Water Research Project (SCCWRP),
or any other coordinator named by the Executive Officer, pursuant to CWC 13267, 13383,
and 40 CFR 122.48. The intent of the Southern California Bight Regional Monitoring Program
is to maximize the efforts of all monitoring partners using a more cost-effective monitoring
design and to best utilize the pooled scientific resources of the Southern California Bight.
During these coordinated sampling efforts, the Discharger’s receiving water sampling and
analytical effort, as defined in section IV of this MRP, may be reallocated to provide a regional
assessment of the impact of the discharge of municipal wastewater to the Southern California
Bight. In that event, the Executive Officer shall notify the Discharger in writing that the
requirement to perform the receiving water sampling and analytical effort defined in section IV
of this MRP is suspended for the duration of the reallocation. Anticipated modifications to the
monitoring program will be coordinated so as to provide a more comprehensive picture of the
ecological and statistical significance of monitoring results and to determine cumulative
impacts of various pollution sources. The level of resources in terms of sampling and
analytical effort redirected from the receiving water monitoring program required under
section IV this MRP shall approximately equal the level of resources provided to implement
the regional monitoring and assessment program, unless the Executive Officer, the
Discharger and City of San Diego agree otherwise. The specific scope and duration of the
receiving water monitoring program reallocation and redirection shall be determined in writing
by the Executive Officer in consultation with the Discharger and City of San Diego.

VI. SPECIAL STUDIES REQUIREMENTS
Compliance with Bacteriological Standards
By letter dated January 10, 2013, the City of San Diego provided a tabulation and
interpretation of the SBOO receiving water monitoring data for the past 17 years. From 1999
to 2010, the Discharger (USIBWC) discharged advanced primary treated wastewater from the
Facility into the Pacific Ocean through the SBOO. During this same time period, sample
results at the three offshore receiving water stations closest to the SBOO ranged from 72 to
94 percent in compliance with bacterial water quality objectives and samples at all the
offshore receiving water stations for SBOO ranged from 90 to 95 percent in compliance with
bacterial water quality objectives. After USIBWC commenced discharging secondary treated
effluent from the Facility to meet secondary treatment requirements in January, 2011, sample
results at the three offshore stations closest to the SBOO were 99 percent in compliance and
sample results at all the offshore stations for SBOO were also 99 percent in compliance.
A new analysis of the receiving water bacterial data is necessary to demonstrate if the SBOO
discharge is attaining full compliance with bacteriological receiving water limitations described
in section V.A.1 of this Order at all times. The data set used for this analysis must be
sufficient to provide statistically defensible conclusions and shall include all receiving water
bacterial data collected after July 31, 2012, when the Facility discharge attained substantial
compliance with secondary treatment standards, through December 31, 2015. Primary
questions to be addressed include the following:
(1) Does the Facility effluent cause or contribute to an exceedance of bacteriological
receiving water limitations described in section V.A.1 of this Order in ocean waters
outside the zone of initial dilution?
(2) What is the extent and magnitude of any identified exceedance of bacteriological
receiving water limitations described in section V.A.1 of this Order?
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South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

(3) Do any identified exceedances impact any marine water contact recreation zones?
(4) If noncompliance with bacteriological receiving water limitations is identified, and if the
noncompliance has not been corrected, what is the anticipated time it is expected to
continue; and what are the steps taken or planned to reduce, eliminate, and prevent
reoccurrence of the noncompliance?
Bacteriological Standards Compliance Assessment Report. The Discharger shall prepare
and submit a technical report, no later than July 1, 2016, based on a study design consistent
with the criteria described above. The technical report shall include an evaluation,
interpretation and tabulation of the bacterial data used in the analysis. The report shall include
interpretations and conclusions as to whether compliance with bacteriological receiving water
limitations described in section V.A.1 of this Order has been attained at each sample station.
If noncompliance with bacteriological receiving water limitations is identified, and if the
noncompliance has not been corrected, the report shall also indicate the anticipated time it is
expected to continue; and describe the steps taken or planned to reduce, eliminate, and
prevent reoccurrence of the noncompliance.
VII. OTHER MONITORING REQUIREMENTS
A.

Facilities Spills
For all Facilities Spill Events, as defined in section VI.C.2.a.i, the Discharger shall include a
detailed summary of spills in the monthly self-monitoring report for the month in which the spill
occurred. All Facilities Spill Events shall be tabulated on a monthly basis and summarized in
the monthly self-monitoring report. If no spills occurred during the calendar month, the
Discharger shall report no Facilities Spill Events in the monthly self-monitoring report for that
calendar month. The following information shall be included for each event:
1. A description of the event and its cause (if known);
2. The location(s) where the event occurred, including the location;
3. The duration of the event (i.e., flow start and stop time, or expected stop time if ongoing
due to repairs and maintenance);
4. The volume of the event including a description of any methodology, standardized
templates, tables, or pictures used to provide the volume estimate (or flow rate if ongoing);
5. The results of any sampling conducted;
6. The amount of precipitation that occurred in the 72 hours prior to the event start time or
during the event (if applicable);
7. Corrective actions taken or planned (if applicable); and
8. A description of any modifications made or planned to the Spill and Transboundary
Wastewater Flow Prevention and Response Plan (if applicable).

B.

Transboundary Wastewater Flows
The term transboundary wastewater flow is used in this Order to refer to a variety of flows
containing pollutants from Tijuana, Mexico that have historically flowed into the United States
via the north-draining canyons and ravines identified in this Order as Goat Canyon,
Smugglers Gulch, Silva Drain, Canyon del Sol, and Stewart’s Drain that empty into the
Tijuana River Valley and Estuary. These wastewater flows from Tijuana are attributed to a
variety of sources and causes including, but not limited to, treated wastewater effluent
discharges, potable water leaks, sewer line leaks and spills, discharges from unsewered
areas, and other failures and breakdowns of the wastewater collection infrastructure in

ATTACHMENT E – MRP

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U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Mexico. The transboundary wastewater flows consist of treated and untreated municipal and
industrial wastewater, potable water, and other miscellaneous flows depending on the source
of the flow. These transboundary wastewater flows have adversely impacted the Tijuana
River Valley and Estuary as well as adjacent coastal marine waters and beaches.
Monitoring of dry-weather transboundary wastewater flows that pass any one of the five
Discharger’s canyon collector systems is necessary to answer the following questions:
(1) What is the frequency and volume of dry weather transboundary wastewater flows?
(2) What are the sources of dry weather transboundary wastewater flows?
(3) What pollutants are present in dry weather transboundary wastewater flows and what
is their concentration?
(4) Do pollutants in dry weather transboundary wastewater flows affect beneficial uses of
the Tijuana River and Estuary?
(5) What is the mass loading of pollutants on the Tijuana River and Estuary from dry
weather transboundary wastewater flows over time?
(6) Are the canyon collector systems being properly operated and maintained to ensure
compliance with the conditions of the Order?
1.

Scope of Monitoring. The Discharger shall conduct the monitoring and reporting
program set forth below for the following event type:
a.

Transboundary Wastewater Flow Past the Canyon Collector System (Flow Event
Type A) A dry weather transboundary treated or untreated wastewater or other flow
through a conveyance structure owned and operated by the United States
Government into Smuggler Gulch, Goat Canyon, Canyon del Sol, Stewart’s Drain,
or Silva Drain and not diverted into the canyon collector system for treatment at the
Facility.

b.

Transboundary Wastewater Flow Event or Other Spill/Wastewater Flow Event in
Mexico (Flow Event Type B). A dry weather spill or dry weather transboundary
wastewater or other flow (not categorized in other Event Types) that creates, or
threatens to create, pollution or nuisance conditions in waters of the United States
and/or State including the Tijuana River (main channel), Yogurt Canyon drainage,
other unnamed drainages and nearby coastal marine waters. These spills or
transboundary flows include, but are not limited to the following:
i.

A dry weather transboundary treated or untreated wastewater flow in waters of
the Tijuana River (main channel) as described in Commitment No. 16 of IBWC
Minute No. 283 (Conceptual Plan for the International Solution to the Border
Sanitation Problem in San Diego, California/Tijuana, Baja California, July 2,
1990).

ii. A dry weather transboundary treated or untreated wastewater flow through a
conveyance structure owned and operated by the United States Government
into Yogurt Canyon.
iii. Spills or wastewater flows occurring in Mexico that the Discharger has
knowledge of.
2.

Inspections. The Discharger shall conduct daily inspections of the international border
areas at Smugglers Gulch, Goat Canyon, Canyon del Sol, Stewart's Drain, and Silva

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South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Drain for the transboundary wastewater flows described in section VI.B.1.b above (see
Table E-1 for Transboundary Station Locations). The inspections shall be documented,
recorded, and contain the following information:
a.

The monitoring location name and/or GPS coordinates, date, and time of inspection;

b.

The weather conditions at the time of inspection;

c.

The operational condition of the canyon collector system; and

d.

If a flow is observed passing the Discharger’s canyon collector system, the
approximate date/time and amount of the last precipitation event, the estimated total
volume diverted into the Discharger’s canyon collector system, the estimated total
volume that passes the Discharger’s canyon collector system, and a description of
the flow estimate methodology, including any standardized templates, tables, or
pictures used to provide the estimates.

e.

If no flow is observed that observation shall be recorded.

In the event that the Discharger is unable to inspect a location due to safety, legal, or
other reasons, the inspection can be omitted. The Discharger shall record the
circumstances for omitting the inspection.
3.

Monitoring. If there is a transboundary flow that passes the Discharger’s canyon
collector system observed at the time of inspection, the Discharger shall monitor the flow
for the parameters set forth below:
Table E-10. Spills and Transboundary Wastewater Flow Monitoring
Parameter

Monitoring Location
Name and/or
GPS coordinates
Flow
BOD5
TSS
TDS
Turbidity
pH
Total Nitrogen
Total Phosphorus
Enterococcus
Fecal Coliform
Total Coliform
Dissolved Oxygen
Pesticides4
Surfactants (MBAS)
Priority Pollutants5
Chronic Toxicity
1
2
3.
4

Units

Sample Type

Minimum
Sampling
Frequency

Required
Analytical
Test Method

--

--

--

--

MGD
mg/L
mg/L
mg/L
NTU
pH Units
mg/L
mg/L
number/100mL
number/100mL
number/100mL
mg/L
ug/L
ug/L
ug/L
TUc

Estimate1
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab
Grab

1/day

--

2

3

2

3

2

3

2

3

2

3

2

3

2

3

2

3

2

3

2

3

2

3

2

3

2

3

2

3

2

3

A description of any methodology, standardized templates, tables or pictures used to provide the flow estimate
shall be included in the report.
For transboundary wastewater flows that occur during dry weather (as defined in Attachment A of this Order),
monitoring for these parameters is required once per Dry Weather flow event.
As required under 40 CFR part 136.
CWA section 301(h) pesticides listed at 40 CFR section 125.58(p).

ATTACHMENT E – MRP

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U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant
5

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

California Toxics Rule; Priority pollutants as specified in 40 CFR section 131.38.

The reported results shall also include daily mass loading for BOD, TSS, TDS, total
nitrogen, total phosphorus, pesticides, surfactants, and priority pollutants.
4.

Monthly Report. All transboundary wastewater flow events shall be tabulated on a
monthly basis and summarized in the monthly self-monitoring report. For Flow Event
Type A, as defined in section VI.C.2.a.i of this Order, the monthly report shall include all
the information set forth below. For Flow Event Type B, as defined in section VI.C.2.a.i
of this Order, the monthly report shall include at a minimum the information set forth in
items a-d, g, h, l, and m below to the extent such information is available. If no
transboundary wastewater flows occurred within the calendar month, the Discharger
shall report “no transboundary wastewater flows” for that calendar month in the monthly
self-monitoring report. Each monthly report shall also include the rain gauge data from
the Goat Canyon ALERT station and any other applicable rain gauge station, regardless
of whether there was a transboundary flow event or not.
a.

A description of the event and its cause (if known);

b.

The location(s) where the event occurred, including the Transboundary Station
location name (if applicable);

c.

The duration of the event (i.e., flow start and stop time, or expected stop time if
ongoing due to repairs and maintenance);

d.

The volume of the event including a description of any methodology, standardized
templates, tables, or pictures used to provide the volume estimate (or flow rate if
ongoing);

e.

The results of any sampling conducted pursuant to section VI.A.3 of Attachment E,
Table E-10 above;

f.

The reported results, if any, shall also include daily mass loading for BOD, TSS,
TDS, total nitrogen, total phosphorus, pesticides, surfactants, and priority pollutants;

g.

The amount of precipitation that occurred in the 72 hours prior to the event start time
or during the event at the Goat Canyon ALERT station and any other applicable rain
gauge station (if applicable);

h.

The location and approximate volume of any related sewage spills that occurred in
Tijuana, Mexico that may be contained in the reported transboundary wastewater
flow (if known);

i.

If applicable, the reason why the canyon collector(s) did not capture the flow, or the
date and time the canyon collector(s) were closed (if the transboundary wastewater
flow ran past one or more of the canyon collectors);

j.

The most recent inspection, operation, and maintenance records for the applicable
canyon collector(s) (if the transboundary wastewater flow ran past one or more of
the canyon collectors);

k.

Corrective actions taken or planned (if applicable) (if the transboundary wastewater
flow ran past one or more of the canyon collectors); and

l.

A description of any modifications made or planned to the Spill and Transboundary
Wastewater Flow Prevention and Response Plan (if applicable); and

ATTACHMENT E – MRP

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U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

m.

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Any coordination with CILA to determine the reasons why the event occurred and
any corrective actions planned or taken.

VIII. REPORTING REQUIREMENTS
A.

General Monitoring and Reporting Requirements
1.
2.

B.

The Discharger shall comply with all Standard Provisions (Attachment D of this Order)
related to monitoring, reporting, and recordkeeping.
The Discharger shall report all instances of noncompliance not reported under
Attachment D, Sections V.E, V.G, and V.H, of this Order at the time monitoring reports
are submitted.

Self-Monitoring Report (SMR) Submittal
1.

The Discharger shall electronically submit SMRs using the State Water Board’s
California Integrated Water Quality System (CIWQS) Program website
(http://www.waterboards.ca.gov/ciwqs/index.html). SMRs must be signed and certified as
required by the Standard Provisions (Attachment D). The CIWQS website will provide
additional information for SMR submittal in the event of a planned or unplanned service
interruption for electronic submittal. The Discharger shall maintain sufficient staffing and
resources to ensure it submits SMRs that are complete and timely. This includes
provision for training and supervision of individuals on how to prepare and submit SMRs.

2.

The Discharger shall report in the SMR the results for all monitoring specified in this
MRP under sections III through X. The Discharger shall submit SMRs including the
results of all required monitoring using USEPA-approved test methods or other test
methods specified in this Order. If the Discharger monitors any pollutant more frequently
than required by this Order, the results of this monitoring shall be included in the
calculations and reporting of the data submitted in the SMR. When CIWQS does not
provide for entry into a tabular format within the system, the Discharger shall
electronically submit the data in a tabular format as an attachment.

3.

Unless otherwise noted in the MRP, monitoring periods and reporting for all required
monitoring shall be completed according to the following schedule:
Table E-11. Monitoring Periods and Reporting Schedule

Sampling
Frequency/
Report Type
Continuous

1/Day

1/Week

Monitoring Period Begins

Monitoring Period

First day of the calendar
month following the permit
effective date or on permit
All
effective date if that date is
first day of the month.
First day of the calendar
month following the permit
(Midnight through 11:59 PM) or any 24effective date or on permit hour period that reasonably represents a
effective date if that date is
calendar day for purposes of sampling.
first day of the month.
First Sunday of the calendar
month following the permit
effective date or on permit
Sunday through Saturday
effective date if that date is
on the first Sunday of the
calendar month.

ATTACHMENT E – MRP

SMR Due Date
First day of second
calendar month
following month of
sampling.
First day of second
calendar month
following month of
sampling.
First day of second
calendar month
following month of
sampling.

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U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant
Sampling
Frequency/
Report Type

Monitoring Period Begins
First day of calendar month
following permit effective
date or on permit effective
date if that date is first day
of the month.
Closest of January 1,
April 1, July 1, or October 1
following (or on) permit
effective date.

1,2

1/Monthly

1/Quarter

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Monitoring Period

SMR Due Date

First day of calendar month through last
day of calendar month

First day of second
calendar month
following month of
sampling.

January 1 through March 31
April 1 through June 30
July 1 through September 30
October 1 through December 31

Interim
Receiving Water
Monitoring
Report
(executive
summary)3

January 1 following (or on)
the Order effective date.

One calendar year

Biennial
Receiving Water
Monitoring and
Assessment
Report (full
assessment) 4

January 1 following (or on)
the Order effective date.

Two calendar years

Oral/Written
Biennial State of
the Ocean
Report5

January 1 following (or on)
the Order effective date.

Two calendar years

1
2
3
4
5

May 1
August 1
November 1
February 1
July 1 of the year
following the even
years (e.g., separate
reports for calendar
years 2016 (due
7/1/2017), 2018 (due
7/1/2019), and 2020
(due 7/1/2021))
July 1 of the year
following the odd
years (e.g., biennial
reports for calendar
years 2016-2017
(due 7/1/2018),
2018-2019 (due
7/1/2020), and 20202021(due 7/1/2022))
By December 31 of
the year following the
odd years (e.g.,
biennial reports for
calendar years 20162017 (due 12/2018),
2018-2019 (due
12/2020), and 20202021(due 12/2022))

Include the Monthly Report as required by sections VI.A and VI.B.4 of this Attachment E of Order No. R9-2014-0009.
Include monitoring results for offshore stations (section IV.B of this MRP) in the monthly SMRs
As specified in sections IV.E.1 and IV.E.2 of this MRP.
As specified in sections IV.B.2.c, IV.E.1, and IV.E.3 of this MRP.
As specified in section IV.E.4 of this MRP.

4.

Reporting Protocols. The Discharger shall report with each sample result the applicable
reported Minimum Level (reported ML, also known as the Reporting Level, or RL) and
the current Method Detection Limit (MDL), as determined by the procedure in 40 CFR
Part 136. For each numeric effluent limitation or performance goal for a parameter
identified in Table 1 of the Ocean Plan, the Discharger shall not use a ML greater than
that specified in Appendix II of the Ocean Plan.
The Discharger shall report the results of analytical determinations for the presence of
chemical constituents in a sample using the following reporting protocols:

ATTACHMENT E – MRP

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U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

a.

Sample results greater than or equal to the reported ML shall be reported as
measured by the laboratory (i.e., the measured chemical concentration in the
sample).Sample results less than the reported ML, but greater than or equal to the
laboratory’s MDL, shall be reported as “Detected, but Not Quantified,” or DNQ. The
estimated chemical concentration of the sample shall also be reported.

b.

For the purposes of data collection, the laboratory shall write the estimated chemical
concentration next to DNQ. The laboratory may, if such information is available,
include numerical estimates of the data quality for the reported result. Numerical
estimates of data quality may be percent accuracy (± a percentage of the reported
value), numerical ranges (low to high), or any other means considered appropriate
by the laboratory.

c.

Sample results less than the laboratory’s MDL shall be reported as “Not Detected,”
or ND.

d.

Dischargers are to instruct laboratories to establish calibration standards so that the
ML value (or its equivalent if there is differential treatment of samples relative to
calibration standards) is the lowest calibration standard. At no time is the Discharger
to use analytical data derived from extrapolation beyond the lowest point of the
calibration curve.

5.

Compliance Determination. Compliance with effluent limitations for reportable
pollutants shall be determined using sample reporting protocols defined above and
Attachment A of this Order. For purposes of reporting and administrative enforcement by
the San Diego Water Board and State Water Board, the Discharger shall be deemed out
of compliance with effluent limitations if the concentration of the reportable pollutant in
the monitoring sample is greater than the effluent limitation and greater than or equal to
the reported Minimum Level (ML).

6.

Multiple Sample Data. When determining compliance with a measure of central
tendency (arithmetic mean, geometric mean, median, etc.) of multiple sample analyses
and the data set contains one or more reported determinations of “Detected, but Not
Quantified” (DNQ) or “Not Detected” (ND), the Discharger shall compute the median in
place of the arithmetic mean in accordance with the following procedure:
a.

b.

7.

C.

The data set shall be ranked from low to high, ranking the reported ND
determinations lowest, DNQ determinations next, followed by quantified values (if
any). The order of the individual ND or DNQ determinations is unimportant.
The median value of the data set shall be determined. If the data set has an odd
number of data points, then the median is the middle value. If the data set has an
even number of data points, then the median is the average of the two values
around the middle unless one or both of the points are ND or DNQ, in which case
the median value shall be the lower of the two data points where DNQ is lower than
a value and ND is lower than DNQ.

Violations. The SMRs shall clearly identify violations of the WDR’s; discuss corrective
actions taken or planned; and the proposed time schedule for corrective actions.
Identified violations must include a description of the requirement that was violated and a
description of the violation.

Discharge Monitoring Reports (DMR’s)
1.

At any time during the term of this permit, the State or San Diego Water Board may
notify the Discharger to electronically submit DMR’s. Until such notification is given

ATTACHMENT E – MRP

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U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

specifically for the submittal of DMR’s, the Discharger shall submit DMR’s in accordance
with the requirements described below.
2.

DMR’s must be signed and certified as required by the standard provisions
(Attachment D). The Discharger shall submit the original DMR and one copy of the DMR
to the address listed below:
STANDARD MAIL

State Water Resources Control Board
Division of Water Quality
c/o DMR Processing Center
PO Box 100
Sacramento, CA 95812-1000

FEDEX/UPS/
OTHER PRIVATE CARRIERS
State Water Resources Control Board
Division of Water Quality
c/o DMR Processing Center
1001 I Street, 15th Floor
Sacramento, CA 95814

3.

4.
D.

All discharge monitoring results must be reported on the official USEPA pre-printed DMR
forms (EPA Form 3320-1) or on self-generated forms that follow the exact same format
of EPA Form 3320-1.
If either agency relocates its offices, the reports shall be submitted to the new office
address provided by the San Diego Water Board.

Other Reports
The following reports are required under Special Provisions (section VI.C), Attachment E
section IX, and the California Code of Regulations and shall be submitted to the San Diego
Water Board, signed and certified as required by the Standard Provisions (Attachment D):

ATTACHMENT E – MRP

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U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Table E-12. Other Reports
Report
Prevention/Response Plan
Prevention/Response Plan
Amendment
Request to CILA to share
Prevention/Response Plan and
written confirmation from CILA

Location of
requirement
Section VI.C.2.a.ii
Section
VI.C.2.a.iii.a)
Section VI.C.2.b.i

Due Date
180 days after adoption of this Order
As Needed
1 year after adoption of this Order


Agenda and Meeting Summary for
binational technical committee
meetings on transboundary
wastewater flow prevention and
response
Presentation on transboundary
wastewater flows
Preliminary Spill and
Transboundary Wastewater Flow
Report
Certified Spill and Transboundary
Wastewater Flow Report
Toxicity Reduction Evaluation
Workplan
Results of any Toxicity Reduction
Evaluation (TRE) Evaluation
Bacteriological Standards
Compliance Assessment Report.


Section VI.C.2.b.ii


Section VI.C.2.b.v

See Table 6 of this Order

Section VI.C.2.d.iii

As Needed

Section VI.C.2.d.iv

As Needed

Section VI.C.2.e.i

180 days after adoption of this Order

Section VI.C.2.e.iii

Within 30 days of completion of the TRE

Section VI of
Attachment E

July 1, 2016

Influent Limitations

Section VI.C.5.a.i

Agenda and Meeting Summary for
binational technical committee
meetings on transboundary
wastewater flow prevention and
response

Section VI.C.5.b.i

Presentation and one-page
summary information sheet on
pretreatment information
Annual Pretreatment Report
Annual Sludge Report
Plume Tracking Monitoring Plan
(PTMP)
Report of Waste Discharge (for
reissuance)

ATTACHMENT E – MRP



January 1 through March 31 Report
Due May 1
April 1 through June 30 Report
Due August 1
July 1 through September 30 Report
Due November 1
October 1 through December 31 Report
Due February 1

Within one year of the adoption of this
Order
 January 1 through March 31 Report
Due May 1
 April 1 through June 30 Report
Due August 1
 July 1 through September 30 Report
Due November 1
 October 1 through December 31 Report
Due February 1

Section VI.C.5.b.iv

See Table 8 of this Order

Section VI.C.5.c.v
Section VI.C.5.d.xi
Section IV.B.2 of
this MRP
Title 23, California
Code of Regulations

March 31
March 30
March 30, 2018
180 days before the Order expiration date

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South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

F.
ATTACHMENT F – FACT SHEET
Contents
I. 
II. 

III. 

IV. 

V. 
VI. 

VII. 

Permit Information ......................................................................................................................... F-3 
Facility Description ........................................................................................................................ F-4 
A.  Description of Wastewater Collections .................................................................................. F-5 
B.  Description of Wastewater and Solids Treatment and Controls ............................................ F-6 
C.  Discharge Points and Receiving Waters ............................................................................... F-6 
D.  Summary of Existing Requirements and Self-Monitoring Report (SMR) Data ...................... F-7 
E.  Compliance Summary ......................................................................................................... F-12 
F.  Planned Changes ................................................................................................................ F-13 
Applicable Plans, Policies, and Regulations ............................................................................... F-13 
A.  Legal Authorities .................................................................................................................. F-13 
B.  California Environmental Quality Act ................................................................................... F-13 
C.  State and Federal Laws, Regulations, Policies, and Plans ................................................. F-13 
D.  Impaired Water Bodies on CWA 303(d) List ........................................................................ F-15 
E.  Other Plans, Polices and Regulations ................................................................................. F-16 
Rationale for Effluent Limitations and Discharge Specifications ................................................. F-16 
A.  Discharge Prohibitions......................................................................................................... F-16 
B.  Technology-Based Effluent Limitations ............................................................................... F-17 
1.  Scope and Authority..................................................................................................... F-17 
2.  Applicable Technology-Based Effluent Limitations ...................................................... F-17 
C.  Water Quality-Based Effluent Limitations (WQBELs) .......................................................... F-18 
1.  Scope and Authority..................................................................................................... F-18 
2.  Applicable Beneficial Uses and Water Quality Criteria and Objectives ....................... F-19 
3.  Determining the Need for WQBELs ............................................................................. F-19 
4.  WQBEL Calculations ................................................................................................... F-23 
5.  Whole Effluent Toxicity (WET) ..................................................................................... F-31 
D.  Final Effluent Limitation Considerations .............................................................................. F-31 
1.  Anti-Backsliding Requirements .................................................................................... F-31 
2.  Antidegradation Policies .............................................................................................. F-33 
3.  Stringency of Requirements for Individual Pollutants .................................................. F-33 
E.  Interim Effluent Limitations – Not Applicable ....................................................................... F-33 
F.  Land Discharge Specifications – Not Applicable ................................................................. F-33 
G.  Recycling Specifications – Not Applicable........................................................................... F-34 
Rationale for Receiving Water Limitations .................................................................................. F-34 
Rationale for Provisions .............................................................................................................. F-34 
A.  Standard Provisions ............................................................................................................ F-34 
B.  Special Provisions ............................................................................................................... F-34 
1.  Reopener Provisions.................................................................................................... F-34 
2.  Special Studies and Additional Monitoring Requirements ........................................... F-34 
3.  Best Management Practices and Pollution Prevention – Not Applicable ..................... F-38 
4.  Construction, Operation, and Maintenance Specifications – Not Applicable ............... F-38 
5.  Special Provisions for Municipal Facilities (Wastewater Facilities Only) ..................... F-38 
6.  Other Special Provisions.............................................................................................. F-40 
7.  Compliance Schedules – Not Applicable ..................................................................... F-40 
Rationale for Monitoring and Reporting Requirements ............................................................... F-40 
A.  Core Monitoring Requirements............................................................................................ F-40 
B.  Receiving Water Monitoring Requirements ......................................................................... F-42 

ATTACHMENT F – FACT SHEET

138

F-1

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

1.  Shoreline Water Quality Monitoring Requirements ...................................................... F-42 
2.  Offshore Water Quality Monitoring Requirements ....................................................... F-43 
3.  Benthic Community Protection Monitoring Requirements ........................................... F-43 
4.  Fish and Invertebrate Monitoring Requirements .......................................................... F-44 
5.  Receiving Water Monitoring Reports ........................................................................... F-44 
6.  Groundwater – Not Applicable ..................................................................................... F-45 
C.  Regional Monitoring Requirements ..................................................................................... F-45 
1.  Kelp Bed Canopy Monitoring Requirements ................................................................ F-46 
2.  Southern California Bight Monitoring Program Participation Requirements ................ F-46 
D.  Special Studies Requirements ............................................................................................ F-47 
E.  Other Monitoring Requirements .......................................................................................... F-48 
VIII.  Public Participation ...................................................................................................................... F-49 
A.  Notification of Interested Parties.......................................................................................... F-49 
B.  Written Comments ............................................................................................................... F-49 
C.  Public Hearing ..................................................................................................................... F-49 
D.  Appeal of Waste Discharge Requirements .......................................................................... F-49 
E.  Information and Copying ..................................................................................................... F-50 
F.  Register of Interested Persons ............................................................................................ F-50 
G.  Additional Information .......................................................................................................... F-50 
Tables
Table F-1. Facility Information .............................................................................................................. F-3 
Table F-2. Historic Influent Limitations and Monitoring Data ................................................................ F-7 
Table F-3. Historic Effluent Limitations and Monitoring Data (Major Constituents and Properties of
Wastewater) .......................................................................................................................................... F-8 
Table F-4. Historic Effluent Limitations and Monitoring Data (Protection of Marine Aquatic Life) ........ F-8 
Table F-5. Historic Effluent Limitations and Monitoring Data (protection of Human Health) ................. F-9 
Table F-6. Basin Plan Beneficial Uses................................................................................................ F-14 
Table F-7. Ocean Plan Beneficial Uses .............................................................................................. F-14 
Table F-8. Summary of Technology-Based Effluent Limitations Based on Secondary Treatment
Standards ........................................................................................................................................... F-18 
Table F-9. Summary of Technology-Based Effluent Limitations Based on Table 2 of the Ocean Plan .. F18 
Table F-10. RPA Results Summary .................................................................................................... F-21 
Table F-11. Pollutants Having Background Concentrations ............................................................... F-24 
Table F-12. Water Quality Objectives from the Ocean Plan for Zinc .................................................. F-25 
Table F-13. Summary of Water Quality-based Effluent Limitations, Discharge Point No. 001 ........... F-25 
Table F-14. Summary of Performance Goals ..................................................................................... F-27 

ATTACHMENT F – FACT SHEET

139

F-2

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

ATTACHMENT F – FACT SHEET
As described in section I, the San Diego Water Board incorporates this Fact Sheet as findings of the
San Diego Water Board supporting the issuance of this Order. This Fact Sheet includes the legal
requirements and technical rationale that serve as the basis for the requirements of this Order.
This Order has been prepared under a standardized format to accommodate a broad range of
discharge requirements for Dischargers in California. Only those sections or subsections of this Order
that are specifically identified as “Not Applicable” have been determined not to apply to this Discharger.
Sections or subsections of this Order not specifically identified as “Not Applicable” are fully applicable to
this Discharger.
I.

PERMIT INFORMATION
The following table summarizes administrative information related to the facility.
Table F-1. Facility Information
WDID
Discharger
Name of Facility
Facility Address
Facility Contact, Title and
Phone
Authorized Person to Sign
and Submit Reports
Mailing Address
Billing Address
Type of Facility
Major or Minor Facility
Threat to Water Quality
Complexity
Pretreatment Program
Recycling Requirements
Facility Permitted Flow
Facility Design Flow
Watershed
Receiving Water
Receiving Water Type

9 000000732
International Boundary and Water Commission, United States Section
South Bay International Wastewater Treatment Plant
2995 Clearwater Way
San Diego, CA 92154
San Diego County
Steven J. Smullen, Area Operations Manager, 619-662-7600
Dawi Dakhil, Civil Engineer, 619-662-7600
4171 N. Mesa, C-100, El Paso, TX 79902
Same as mailing address
Federally Owned Treatment Works (FOTW)
Major
1
A
Pretreatment Program administered by the Government of Mexico
No
25 million gallons per day (MGD)
25 MGD
Pacific Ocean
Pacific Ocean
Ocean

A. The United States section of the International Boundary and Water Commission (hereinafter
Discharger or USIBWC) is the owner of the South Bay International Wastewater Treatment
Plant (Facility or IWTP), five canyon collectors, two pump stations, the South Bay Land Outfall
(SBLO) , South Bay Ocean Outfall (SBOO), and other associated infrastructure (collectively
referred to as Facilities). The Discharger contracts with an entity to operate and maintain the
Facilities. The SBLO is jointly owned by the Discharger and City of San Diego and operated
and maintained by the Discharger. The SBOO is jointly owned and operated by the
Discharger and City of San Diego. The City of San Diego discharges secondary effluent from
ATTACHMENT F – FACT SHEET

140

F-3

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

its South Bay Water Reclamation Plant (SBWRP) to the SBOO via the SBLO under separate
waste discharger requirements (Order No. R9-2013-0006, NPDES Permit No. CA0109045).
For the purposes of this Order, references to the “discharger” or “permittee” in applicable
federal and state laws, regulations, plans, or policy are held to be equivalent to references to
the Discharger herein.

B. The Facility discharges wastewater to the Pacific Ocean, a water of the United States. The
discharge was previously regulated by Order No. 96-50 and National Pollutant Discharge
Elimination System (NPDES) Permit No. CA0108928 adopted on November 14, 1996 and
expired on October 10, 2001. In accordance with Title 40, Code of Federal Regulations (CFR)
section 122.6 and the State’s regulations at title 23, division 3, chapter 9, article 3, section
2235.4 of the California Code of Regulations (CCR), the terms of the existing Order were
administratively extended and continued in effect after the permit expiration date until the
adoption of Order No. R9-2014-0009. Attachment B provides a map of the area around the
Facilities. Attachment C provides a flow schematic of the Facilities.

C. The Discharger filed a Report of Waste Discharge (ROWD) and submitted an application of
renewal for its Waste Discharge Requirements (WDR’s) and NPDES permit in 2001. Because
of ongoing litigation, finally concluded in 2013, the NPDES permit was not reissued at that
time. The Discharger filed an updated ROWD and application for renewal of WDR’s and
NPDES permit in June 3, 2010.
II.

FACILITY DESCRIPTION
After periods of tremendous population growth and a long history of inadequate sewerage facilities
in Tijuana, Mexico and associated transboundary raw sewage flows, the governments of the
United States and Mexico in 1990 agreed to build the Facility on the United States side of the
border as part of a bilateral program to address environmental pollution in the international border
region (IBWC Minute No. 283 between the United States and Mexican sections of the International
Boundary and Water Commission). The Facility was built on a 75-acre site in San Ysidro, a
community of the City of San Diego, near the international border in the U.S. immediately north of
Tijuana's main wastewater pumping station. The Facility treats sewage flows exceeding the
capacity of Tijuana’s sewage treatment and conveyance facilities and also treats some
transboundary flows in canyons and gullies that empty from Tijuana into the Tijuana River Estuary
on the United States side of the international border. The Facility was originally planned as a
secondary treatment facility; however, due to financial constraints, the plant was initially
constructed as an advanced primary treatment facility in 1996.
In February 2001, the San Diego Water Board filed a complaint in U.S. District Court, Southern
District of California (Court) against the Discharger, alleging violations of the federal Clean Water
Act and the California Porter-Cologne Water Quality Control Act at the Facility. The complaint
alleged the Discharger violated the terms of its NPDES Permit (San Diego Water Board Order No.
96-50/ NPDES Permit CA0108928) by failing to treat the Facility effluent to secondary treatment
standards and by violating other effluent limitations.
On December 6, 2004, the Court issued a final judgment setting a compliance schedule for the
Discharger to meet federal and state requirements for secondary treatment standards through
construction of an activated sludge secondary treatment process at the Facility to improve effluent
quality. Construction of the Facility upgrade was completed in late 2010; however, the Facility had
an adjustment period of about one and a half years and did not start to consistently achieve
substantial compliance with the NPDES Permit secondary treatment effluent limitations until mid2012. On June 20, 2013, after about a year of substantial compliance with the secondary

ATTACHMENT F – FACT SHEET

141

F-4

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

treatment effluent limitations, the San Diego Water Board informed the Court of its opinion that the
Discharger had complied with the Court’s 2004 judgment.
A.

Description of Wastewater Collections
The Facility receives flow from the City of Tijuana’s municipal collection system which
includes domestic and industrial sources, and receives flow from five canyon collectors used
to capture transboundary dry weather flows. Approximately 25 MGD of sewage from Tijuana’s
72-inch diameter line, at a location upstream of Tijuana’s Pumping Plant (Pump Station 1/1A),
is conveyed to Junction Box 1 in the U.S. by gravity flow. Then the sewage flows from
Junction Box 1 to Junction Box 2 in the U.S. via gravity.
All dry weather flow in the Tijuana River that would otherwise flow into the United States is
currently diverted from the river bed at the international border using the River Diversion
Structure located on the Mexican side of the border. During low flow/ dry weather conditions,
the Tijuana River water is conveyed by the CILA Pump Station, through a line parallel to the
72-inch diameter sewage line, to Tijuana’s Pumping Plant (Pump Station 1/1A). From
Tijuana’s Pumping Plant (Pump Station 1/1A), Tijuana River water is sent south and
discharged directly to the Pacific Ocean at Punta Bandera, located approximately 5.6 miles
south of the international border. No Tijuana River water is currently diverted to the Facility.
During high flow/ wet weather conditions (greater than 1000 liters per second of flow in the
Tijuana River), the River Diversion Structure screens cannot be cleaned; the flow in the
Tijuana River is not diverted and continues across the international border into the United
States.
Canyon collectors are concrete channels and basins designed to capture transboundary dry
weather flows from Mexico in canyons and ravines draining north across the international
border into the United States. There are five canyon collector systems: Goat Canyon
Diversion Structure, Smugglers Gulch Diversion Structure, Silva Drain Canyon Collector,
Canyon del Sol Collector, and Stewarts Drain Canyon Collector. Captured dry weather flows
from these collectors are diverted to the Facility for treatment and disposal through the
SBOO. Any quantity of flows in the canyons exceeding the maximum design capacity of the
canyon collectors overflows the structure and continues flowing north, potentially polluting the
Tijuana River, the Tijuana River Valley and Estuary, and Pacific Ocean waters at south San
Diego beaches. The canyon collector at Goat Canyon Diversion Structure conveys diverted
flow to Goat Canyon Pump Station via gravity. From Goat Canyon Pump Station, flow is
pumped to Hollister Street Pump Station. The canyon collector at Smugglers Gulch Diversion
Structure conveys diverted flow to Hollister Street Pump Station via gravity. From the Hollister
Street Pump Station, the diverted flow is pumped to Junction Box 2. The remaining three
canyon collectors (Silva Drain Canyon Collector, Canyon del Sol Collector, and Stewarts
Drain Canyon Collector) convey flow to Junction Box 2 by gravity flow.
Combined flows gathered at Junction Box 2 are conveyed via gravity to the Facility’s
headworks. Junction Box 1 contains valves to control the amount of Tijuana sewage flowing
into the Facility. The Discharger has the capacity to increase influent flows in the event that
an interruption of service were to occur in Tijuana’s sewage treatment system.
The City of Tijuana operates several wastewater treatment plants in Mexico, including the
San Antonio de los Buenos Treatment Plant. The San Antonio de los Buenos Treatment Plant
operates in parallel to the Facility, possesses a design capacity of 25 MGD, and receives
influent flows from the City of Tijuana conveyance system. Pumping Station 1 consists of a
42-inch force main and a conveyance canal possessing an operational capacity of 36 MGD.
A schematic illustrating the described wastewater collections is included in Attachment C to
this Order

ATTACHMENT F – FACT SHEET

142

F-5

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

B.

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Description of Wastewater and Solids Treatment and Controls
Wastewater treatment unit operations and processes at the Facility consist of three
mechanical bar screens, one grit removal unit, six primary sedimentation tanks with ferric
chloride injection capabilities, polymer injections, seven aeration basins, and 10 secondary
clarifiers. During the winter when the discharge (or outfall) plume is most likely to surface, the
Discharger also chlorinates the effluent with sodium hypochlorite. Treated wastewater is
discharged to the Pacific Ocean through the SBOO, via the SBLO. Attachment C provides a
flow schematic of the Facility.
The advanced primary treatment facility has a peak hydraulic capacity of 100 MGD, a peak
design flow rate of 75 MGD, and an average design flow rate of 25 MGD. The secondary
treatment design capacity is 25 MGD with a peaking factor of approximately 2. If flow from the
primary treatment units to the secondary treatment units exceeds 49.85 MGD, primary
effluent flows exceeding 49.85 MGD bypass the polymer addition and activated sludge
processes and discharge directly to the SBOO. Bypasses are prohibited unless they meet the
requirements contained in Attachment D of this Order, section I.G The annual average daily
discharge flow between the years 2008 through 2012 are summarized below:
Year

Annual Average Daily Flow

2008

23.92 MGD

2009

22.76 MGD

2010

22.95 MGD

2011

24.50 MGD

2012

23.98 MGD

2013

24.44 MGD

Solids from secondary sedimentation tanks are conveyed to three dissolved air flotation units
for thickening. Thickened sludge from the dissolved air flotation units and solids collected
from the primary sedimentation tanks are sent to an on-site solids handling facility for
dewatering using belt-filter presses and lime stabilization. Processed solids are collected onsite and trucked to Mexico for disposal.
C.

Discharge Points and Receiving Waters
The SBLO was completed in March 1994. The SBLO is 12,300 feet long. The SBLO starts at
the Facility and ends at the mouth of Goat Canyon, where it connects to the SBOO. The
diameter of the SBLO is 144 inches. The SBLO and SBOO were constructed for use by the
Discharger and the City of San Diego’s SBWRP. The SBOO extends westward approximately
23,600 feet from SBLO and the mouth of the Tijuana River. The outfall terminates in a wye
diffuser with two 1,980-foot diffusers. The terminus of the ocean outfall and diffusors was
placed within the territorial marine waters of the State as defined by California law.
Each diffuser leg contains 82 diffuser riser assemblies, and one at the wye structure for a total
of 165 diffuser riser assemblies. The SBOO was constructed with a total average design
capacity of 174 MGD and a peak hydraulic capacity of 233 MGD. The Facility is permitted to
discharge up to 25 MGD of secondary treated wastewater to the outfall and the SBWRP is
permitted to discharge up to 15 MGD. The effluent from the SBWRP is combined with the
effluent from the Facility within the SBOO prior to discharge to the Pacific Ocean. To achieve
proper effluent velocity and dilution levels, 18 diffuser risers (72 open ports) are in use on the

ATTACHMENT F – FACT SHEET

143

F-6

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

South leg of the diffuser. The North leg of the diffuser is closed with no open ports. The
terminus of the diffuser is located at Latitude 32° 32' 15" North, Longitude 117° 11' 00" West.
The San Diego Water Board, with assistance from the State Water Board, determined the
minimum initial dilution factor to be 94.6 for the discharge of up to 40 MGD of combined
effluent through the SBOO using the U.S. Environmental Protection Agency (USEPA)approved computer modeling package Visual Plumes with the UM3 model. The computer
modeling was performed based on characteristics of the SBOO, the effluent, and the
receiving water, subject to the input limitations of Visual Plumes. Monthly profiles for the
receiving water were developed using receiving water data provided by the Discharger for the
time period between June 2002 and April 2005. Initial dilution factors were determined for
each monthly profile; the most conservative and minimum initial dilution factor was
determined using the May profile. Section IV.C.3 of this Fact Sheet includes additional
discussion of initial dilution. Additional details of the initial dilution computer modeling
performed are provided in Attachment H and in the San Diego Water Board records.
D.

Summary of Existing Requirements and Self-Monitoring Report (SMR) Data
Influent limitations, effluent limitations, and discharge specifications contained in Order No.
96-50 for discharges from the Facility and representative monitoring data from July 2012 –
October 2013 are as follows:
Table F-2. Historic Influent Limitations and Monitoring Data
Monitoring Data2

Influent Limitation

Average
Monthly

6Month
Median

Maximum
At
Anytime

Highest
Average
Monthly

Highest
Average
6-Month
Median

Highest
Maximum
At
Anytime

mg/L

0.024

--

--

0.153

--

--

lbs/day

5.0

--

--

37,093.9

--

--

mg/L
lbs/day
mg/L

0.0025
0.52
0.061

----

----

<0.0018
<544.9
0.0121

----

----

lbs/day

13

--

--

3,016.3

--

--

mg/L

1.1

--

--

0.0227

--

--

lbs/day

230

--

--

5,556.5

--

--

mg/L

--

0.15

--

--

0.955

--

lbs/day

--

32

--

--

214.7

--

mg/L
lbs/day
mg/L
lbs/day
mg/L
lbs/day
mg/L
lbs/day
mg/L
lbs/day

--0.16
34
-------

0.075
16
----0.44
93
0.052
11

----0.0054
1.1
-----

--0.027
6.4
-------

<0.02
<6.055
----0.236
53.06
0.012
2.698

----0.0167
4.027
-----

Parameter

Units1

Arsenic,
Total
Recoverable
Beryllium
Cadmium,
Total
Recoverable
Chromium,
Total
Recoverable
Copper,
Total
Recoverable
Cyanide
Lead, Total
Recoverable
Mercury
Nickel, Total
Recoverable
Silver, Total
Recoverable

(July 2012 – October 2013)

ATTACHMENT F – FACT SHEET

144

F-7

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928
Monitoring Data2

Influent Limitation
Parameter

Units1

Zinc, Total
Recoverable

1
2

Average
Monthly

6Month
Median

Maximum
At
Anytime

Highest
Average
Monthly

Highest
Average
6-Month
Median

Highest
Maximum
At
Anytime

-----

1.1
220
0.00042
0.088

-----

-----

49.8
2,296.43
<0.000014
<0.00151

-----

mg/L
lbs/day
mg/L
lbs/day

HCH1

(July 2012 – October 2013)

See Attachment A for definitions of abbreviations and a glossary of common terms used in this Order.
ND = Not Detected and NR = Not Reported

Table F-3. Historic Effluent Limitations and Monitoring Data (Major Constituents and Properties
of Wastewater)
Effluent Limitation
Parameter

Units1

Flow
Carbonaceous
Biochemical Oxygen
Demand (5-Day at 20oC)
(CBOD5)
CBOD5 percent removal
Total Suspended Solids
(TSS)
TSS percent removal
Oil & Grease
Settleable Solids
Turbidity
pH
Acute Toxicity
1
2
3

Average
Monthly

Average
Weekly

Maximum
At Anytime

MGD
mg/L

-25

-40

25
45

lbs/day

5,200

8,300

9,400

%
mg/L
lbs/day
%
mg/L
lbs/day
mL/L
NTU
S.U.
TUa

85
--30
45
50
6,300
9,400
10,000
85
--25
40
75
5,200
8,300
16,000
1.0
1.5
3.0
75
100
225
Within limits of 6.0 - 9.0 at all times.
1.5
2.0
2.5

Monitoring Data2
(July 2012 – October 2013)
Highest
Highest
Highest
Average
Average
Maximum
Monthly
Weekly
At Anytime
Discharge
Discharge
3
--18.8
33.1
140
3896.6

7093.6

31,724

NR
26.2
5570
NR
0.1
493.5
NR
8
-3.1

-61.7
13,573.9
-0.1
1,454.4
NR
24.9
-NR

-339
76,817
-39.6
8,973.3
6.2
155
6.2-7.63
8

See Attachment A for definitions of abbreviations and a glossary of common terms used in this Order.
ND = Not Detected and NR = Not Reported
Represents range of monitoring results

Table F-4. Historic Effluent Limitations and Monitoring Data (Protection of Marine Aquatic Life)
Monitoring Data3
(July 2012 – October 2013)

Effluent Limitation2
Parameter

Units1
6-Month
Median

Arsenic, Total
Recoverable
Cadmium, Total
Recoverable
Chromium (VI)

mg/L
lbs/day
mg/L
lbs/day
mg/L
lbs/day

ATTACHMENT F – FACT SHEET

Maximum
Daily

Instantaneous
Maximum

0.51
110
0.10
21
0.20
42

2.9
600
0.40
83
0.81
170

7.8
1,600
1.0
210
2.0
420

Highest
6-month
Median
NR
NR
NR
NR
NR
NR

Highest
Maximum
Daily
NR
NR
NR
NR
NR
NR

Highest
Instantaneous
Maximum
0.216
50.15
0.0124
2.7
0.158
32.46

145

F-8

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Effluent Limitation2
Units1

Parameter

6-Month
Median
Copper, Total
Recoverable
Lead, Total Recoverable
Mercury
Nickel, Total
Recoverable
Selenium
Silver, Total
Recoverable
Zinc, Total Recoverable
Cyanide
Total Chlorine Residual
Ammonia (as N)
Chronic Toxicity
Phenolic Compounds1
(Non-Chlorinated)
Chlorinated Phenolics1
Endosulfan1
Endrin
HCH1
Radioactivity
1
2

3

Maximum
Daily

Instantaneous
Maximum

mg/L
0.10
1.0
2.8
lbs/day
21
210
580
mg/L
0.20
0.81
2.0
lbs/day
42
170
420
mg/L
4.0
16
40
lbs/day
0.83
3.3
8.3
mg/L
0.51
2.0
5.1
lbs/day
100
420
1,000
mg/L
1.5
6.1
15
lbs/day
310
1,300
3,100
mg/L
0.055
0.27
0.69
lbs/day
11
56
140
mg/L
1.2
7.3
19
lbs/day
250
1,500
4,000
mg/L
0.10
0.40
1.0
lbs/day
21
83
210
mg/L
0.20
0.81
6.1
lbs/day
42
170
1,300
mg/L
61
240
610
lbs/day
13,000
50,000
130,000
TUc
--100
mg/L
3.0
12
30
lbs/day
630
2,500
6,300
mg/L
0.10
0.40
1.0
lbs/day
21
83
210
μg/L
0.91
1.8
2.7
lbs/day
0.19
0.38
0.56
μg/L
0.20
0.40
0.61
lbs/day
0.042
0.083
0.13
μg/L
0.40
0.81
1.2
lbs/day
0.083
0.17
0.25
Not to exceed limits specified in title 17, division 1,
chapter 5, subchapter 4, group 3, article 3, section
30253 of the California Code of Regulations.

Monitoring Data3
(July 2012 – October 2013)
Highest
6-month
Median
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
-NR
NR
NR
NR
NR
NR
NR
NR
NR
NR

Highest
Maximum
Daily
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR
400
NR
NR
NR
NR
NR
NR
NR
NR
NR
NR

Highest
Instantaneous
Maximum
0.0517
12.94
0.12
25.31
0.0133
3.01
0.0295
6.1
0.0546
11.97
<0.0007
0.2119
1.4
344.79
<0.00002
6.054
0.0002
45.3
0.0394
8927.95
200
<0.0249
5.15
<0.011
2.185
<0.034
NR
<0.002
0.00052
<0.014
0.0031

See Attachment A for definitions of abbreviations and a glossary of common terms used in this Order.
Effluent limits determined using the 2012 California Ocean Plan, an initial dilution factor of 94.6, and a flow rate of 25
MGD.
ND = Not Detected and NR = Not Reported

Table F-5. Historic Effluent Limitations and Monitoring Data (protection of Human Health)
Parameter

Units1

Effluent
Limitation2
30-day Average

Acrolein
Antimony
Bis(2chloroethoxy)methane

ATTACHMENT F – FACT SHEET

mg/L
lbs/day
mg/L
lbs/day
mg/L
lbs/day

22
4,600
120
25,000
0.44
92

Monitoring Data3
(July 2012 –
October 2013)
Highest
30-day Average
< 0.020
NR
<0.023
NR
<0.001
NR

146

F-9

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Parameter

Units1

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Effluent
Limitation2
30-day Average

Bis(2chloroisopropyl)ether
Chlorobenzene
Chromium (III)
Di-n-butyl Phthalate
Dichlorobenzenes1
Diethyl Phthalate
Dimethyl Phthalate
4,6-dinitro-2methylphenol
2,4-dinitrophenol
Ethylbenzene
Fluoranthene
Hexachlorocyclopentadiene
Nitrobenzene
Thallium
Toluene
Tributyltin
1,1,1-trichloroethane
Acrylonitrile
Aldrin
Benzene
Benzidine
Beryllium
Bis(2-chloroethyl)ether
Bis(2-ethylhexyl)
phthalate
Carbon Tetrachloride
Chlordane1
Chlorodibromomethane
(dibromochloromethane)

ATTACHMENT F – FACT SHEET

mg/L
lbs/day
mg/L
lbs/day
g/L
lbs/day
mg/L
lbs/day
g/L
lbs/day
g/L
lbs/day
g/L
lbs/day
mg/L
lbs/day
μg/L
lbs/day
mg/L
lbs/day
mg/L
lbs/day
mg/L
lbs/day
mg/L
lbs/day
mg/L
lbs/day
g/L
lbs/day
μg/L
lbs/day
g/L
lbs/day
μg/L
lbs/day
ng/L
lbs/day
mg/L
lbs/day
ng/L
lbs/day
μg/L
lbs/day
μg/L
lbs/day
μg/L
lbs/day
μg/L
lbs/day
ng/L
lbs/day
NA
NA

120
25,000
58
12,000
19,000
4,000,000
350
73,000
0.52
110,000
3.3
690,000
83
17,000,000
22
4,600
0.40
83
400
83,000
1.5
310
5.9
1,200
0.49
100
1.4
290
8.6
1,800,000
0.14
0.029
54
11,000,000
10
2.1
2.2
0.00046
0.60
120
7.0
0.0015
3.3
0.69
4.5
0.94
350
73
0.91
19
2.3
0.00048
NA
NA

Monitoring Data3
(July 2012 –
October 2013)
Highest
30-day Average
<0.001
NR
<0.001
NR
0.026
NR
0.0069
NR
2.0x10-12
NR
19x10-6
NR
<0.001
NR
<0.001
NR
22.75
NR
0.0087
NR
<0.001
NR
<0.001
NR
<0.001
NR
<0.011
NR
0.11
NR
0.003
NR
<1x10-6
NR
<20
NR
<75
NR
<0.001
NR
<1
NR
<0.009
NR
<1
NR
61
NR
<1
NR
<50
NR

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147

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Parameter

Units1

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Effluent
Limitation2
30-day Average

Chloroform
DDT1
1,4-dichlorobenzene
3,3-dichlorobenzidine
1,2-dichlorothane
1,1-dichloroethylene
Dichlorobromomethane
Dichloromethane
(Methylene Chloride)
1,3-dichloropropene
(1,3-Dichloropropylene)
Dieldrin
2,4-dinitrotoluene
1,2-diphenylhydrazine
Halomethanes1
Heptachlor
Heptachlor Epoxide
Hexachlorobenzene
Hexachlorobutadiene
Hexachloroethane
Isophorone
N-nitrosodimethylamine
N-nitrosodi-Npropylamine
N-nitrosodiphenylamine
PAHs1
PCBs1
TCDD Equivalents1
1,1,2,2-tetrachlorothane
Tetrachloroethylene
(Tetrachloroethene)

ATTACHMENT F – FACT SHEET

mg/L
lbs/day
ng/L
lbs/day
mg/L
lbs/day
μg/L
lbs/day
mg/L
lbs/day
g/L
lbs/day
NA
NA
mg/L
lbs/day
mg/L
lbs/day
ng/L
lbs/day
μg/L
lbs/day
μg/L
lbs/day
mg/L
lbs/day
ng/L
lbs/day
NA
NA
ng/L
lbs/day
mg/L
lbs/day
μg/L
lbs/day
g/L
lbs/day
mg/L
lbs/day
NA
NA
μg/L
lbs/day
μg/L
lbs/day
ng/L
lbs/day
pg/L
lbs/day
mg/L
lbs/day
mg/L
lbs/day

13
2,700
17
0.0035
1.8
380
0.82
0.17
13
2,700
72
150,000
NA
NA
45
9,400
0.90
190
4.0
0.00083
260
54
16
3.3
13
2,700
73
0.015
NA
NA
21
0.0044
1.4
290
250
52
15
3,100,000
0.74
150
NA
NA
250
52
0.89
0.19
1.9
0.00040
0.39
8.1x10-8
120
25,000
1.0
210

Monitoring Data3
(July 2012 –
October 2013)
Highest
30-day Average
0.015
NR
<10
NR
<0.001
NR
1
NR
<0.001
NR
<1x10-6
NR
<0.001
NR
<0.001
NR
<20
NR
<1
NR
<5
NR
0.0363
NR
<0.01
NR
<1
NR
<0.001
NR
<1
NR
<0.001
NR
0.003
NR
<1
NR
<1
NR
<500
NR
<5
NR
<0.001
NR
0.005
NR

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U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Parameter

Units1

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Effluent
Limitation2
30-day Average

Toxaphene
Trichloroethylene
(Trichloroethene)
1,1,2-trichloroethane
2,4,6-Trichlorophenol
Vinyl Chloride
1

ng/L
lbs/day
mg/L
lbs/day
g/L
lbs/day
μg/L
lbs/day
mg/L
lbs/day

21
0.0044
2.7
560
4.3
900,000
29
6.0
3.6
750

Monitoring Data3
(July 2012 –
October 2013)
Highest
30-day Average
<1,000
NR
0.012
NR
<1x10-6
NR
0.4
NR
<0.005
NR

See Attachment A for definitions of abbreviations and a glossary of common terms used in this Order.
Effluent limits determined using the 2012 California Ocean Plan, an initial dilution factor of 94.6, and a flow rate of 25
MGD.
ND = Not Detected and NR = Not Reported

2

3

E.

Compliance Summary
The Facility first started to discharge advanced primary-treated effluent to the SBOO in
January 1999, under Order No. 96-50. As explained in section II of this Fact Sheet, the
Facility was initially planned as a secondary treatment facility; however, due to financial
constraints, the plant was instead constructed as an advanced primary treatment facility in
1996. The primary-treated effluent could not comply with the secondary treatment effluent
limitations contained in Order No. 96-50 and there were numerous exceedances of other
effluent limitations as well. The effluent exceedances included acute toxicity, ammonia,
CBOD5, chronic toxicity, mercury, TCDD equivalents, TSS, 2,4,6-trichlorophenol, chlordane,
copper, DDT, nickel, PAH, PCB, tributyltin, zinc, turbidity, and flow. From 1996 to 2001, the
Facility was regulated under Cease and Desist Order No. 96-52, which contained a time
schedule for achieving compliance with the secondary treatment effluent limitations contained
in Order No. 96-50. The Cease and Desist Order also contained interim effluent limitations
which would remain in effect until compliance with secondary treatment effluent limitations
was achieved. From 2001 to approximately June 20, 2013, the Facility was subject to a
federal court’s judgment setting a compliance schedule for meeting federal and state
secondary treatment requirements through construction of an activated sludge secondary
treatment process at the Facility to improve effluent quality.
The Facility upgrade to secondary treatment became operational in November 2010;
however, due to various operational problems the facility was unable to consistently achieve
substantial compliance with secondary treatment effluent limitations until mid-2012. Since
June 2013, the Discharger has reported the following influent and effluent limitation
exceedances:


Arsenic (two violations of the monthly average influent concentration limitation (mg/L)
and two violations of the monthly average influent mass emission limitation (lb/day)
on July 27, 2013 and October 20, 2013).



Mercury (one violation of the monthly average influent concentration limitation (mg/L)
and one violation of the monthly average influent mass emission limitation (lb/day) on
August 6, 2013).

ATTACHMENT F – FACT SHEET

F-12

149

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928



CBOD5 (two violations of the instantaneous maximum effluent concentration
limitation (mg/L) and two violations of the instantaneous maximum effluent mass
emission limitation (lb/day) on March 10 and 16, 2014).



TSS (two violations of the instantaneous maximum effluent concentration limitation
(mg/L) and two violations of the instantaneous maximum effluent mass emission
limitation (lb/day) on March 10 and 16, 2014).



Acute Toxicity (one violation of the instantaneous maximum effluent limitation and
nine violations of the 30-day average effluent limitation on July 25 and 31, 2013;
August 5, 8, 13, 15, and 19, 2013;, and March 26 and 27, 2014).



TCDD (four violations of the 30-day average effluent concentration limitation (mg/L)
on July 1, 2013; August 1, 2013; September 1, 2013; and October 1, 2013).

Under the Tentative Order, since June 2013, the Discharger would have only had the
following violations:




Mercury (one violation of the monthly average influent concentration limitation (mg/L)
and one violation of the monthly average influent mass emission limitation (lb/day) on
August 6, 2013).



Acute Toxicity (one violation of the instantaneous maximum limitation on March 26,
2014).


F.

Arsenic (two violations of the monthly average influent concentration limitation (mg/L)
and two violations of the monthly average influent mass emission limitation (lb/day)
on July 27, 2013 and October 20, 2013).

TCDD (four violations of the 30-day average concentration limitation (mg/L) on July
1, 2013; August 1, 2013; September 1, 2013; and October 1, 2013).

Planned Changes
The Discharger completed an upgrade to secondary treatment in November, 2010 and has
not indicated that any plans exist to make additional upgrades or alterations to its system.

III.

APPLICABLE PLANS, POLICIES, AND REGULATIONS
The requirements contained in this Order are based on the requirements and authorities described
in this section.
A.

Legal Authorities
This Order serves as WDR’s pursuant to article 4, chapter 4, division 7 of the Water Code
(commencing with section 13260). This Order is also issued pursuant to section 402 of the
federal Clean Water Act (CWA) and implementing regulations adopted by the USEPA and
chapter 5.5, division 7 of the Water Code (commencing with section 13370). It shall serve as
an NPDES permit for point source discharges from this facility to surface waters.

B.

California Environmental Quality Act
Under Water Code section 13389, this action to adopt an NPDES permit is exempt from the
provisions of chapter 3 of the California Environmental Quality Act (CEQA), (commencing with
section 21100) of division 13 of the Public Resources Code.

C.

State and Federal Laws, Regulations, Policies, and Plans
1.

Water Quality Control Plan. The Water Quality Control Plan for the San Diego Basin
(Basin Plan) designates beneficial uses, establishes water quality objectives, and

ATTACHMENT F – FACT SHEET

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150

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

contains implementation programs and policies to achieve those objectives for all waters
addressed through the plan. The San Diego Water Board adopted, and the State Water
Board approved the Basin Plan in 1975. A subsequent revision to the Basin Plan was
adopted by the San Diego Water Board and approved by the State Water Board in
1994. Beneficial uses applicable to the Pacific Ocean specified in the Basin Plan are as
follows:
Table F-6. Basin Plan Beneficial Uses
Discharge
Point No.

Receiving Water
Name

Pacific Ocean

001

Beneficial Use(s)
Industrial service supply; navigation; contact water recreation;
non-contact water recreation; commercial and sport fishing;
preservation of biological habitats of special significance; wildlife
habitat; rare, threatened, or endangered species; marine habitat;
aquaculture; migration of aquatic organisms; spawning,
reproduction, and/or early development; and shellfish harvesting.

In order to protect the beneficial uses, the Basin Plan establishes water quality objectives
and a program of implementation. Requirements of this Order implement the Basin Plan.
2.

California Ocean Plan. The State Water Board adopted the Water Quality Control Plan
for Ocean Waters of California, California Ocean Plan (Ocean Plan) in 1972 and
amended it in 1978, 1983, 1988, 1990, 1997, 2000, 2005, 2009, and 2012. The State
Water Board adopted the latest amendment on October 16, 2012, and it became
effective on August 19, 2013. The Ocean Plan is applicable, in its entirety, to point
source discharges to the ocean. The Ocean Plan identifies beneficial uses of ocean
waters of the state to be protected as summarized below:
Table F-7. Ocean Plan Beneficial Uses

Discharge
Point No.
001

Receiving
Water

Beneficial Uses

Pacific Ocean

Industrial water supply; water contact and non-contact recreation,
including aesthetic enjoyment; navigation; commercial and sport
fishing; mariculture; preservation and enhancement of designated
Areas of Special Biological Significance (ASBS); rare and endangered
species; marine habitat; fish spawning and shellfish harvesting

In order to protect the beneficial uses, the Ocean Plan establishes water quality
objectives and a program of implementation. Requirements of this Order implement the
Ocean Plan.
3.

Alaska Rule. On March 30, 2000, USEPA revised its regulation that specifies when new
and revised state and tribal water quality standards (WQS) become effective for CWA
purposes (40 CFR section 131.21, 65 Fed. Reg. 24641 (April 27, 2000)). Under the
revised regulation (also known as the Alaska Rule), new and revised standards
submitted to USEPA after May 30, 2000, must be approved by USEPA before being
used for CWA purposes. The final rule also provides that standards already in effect
and submitted to USEPA by May 30, 2000, may be used for CWA purposes, whether or
not approved by USEPA.

4.

Antidegradation Policy. 40 CFR section 131.12 requires that the State water quality
standards include an antidegradation policy consistent with the federal policy. The State
Water Board established California’s antidegradation policy in Resolution No. 68-16

ATTACHMENT F – FACT SHEET

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151

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

(“Statement of Policy with Respect to Maintaining High Quality of Waters in California”).
Resolution No. 68-16 incorporates the federal antidegradation policy where the federal
policy applies under federal law. Resolution No. 68-16 requires that existing water
quality be maintained unless degradation is justified based on specific findings. The
Basin Plan implements, and incorporates by reference, both the State and federal
antidegradation policies. The permitted discharge must be consistent with the
antidegradation provision of 40 CFR section 131.12 and Resolution No. 68-16.
5.

6.

D.

Anti-Backsliding Requirements. Sections 402(o)(2) and 303(d)(4) of the CWA and 40
CFR section 122.44(l) prohibit backsliding in NPDES permits. These anti-backsliding
provisions require that effluent limitations in a reissued permit must be as stringent as
those in the previous permit, with some exceptions in which limitations may be relaxed.
Endangered Species Act Requirements. This Order does not authorize any act that
results in the taking of a threatened or endangered species or any act that is now
prohibited, or becomes prohibited in the future, under either the California Endangered
Species Act (Fish and Game Code sections 2050 to 2097) or the Federal Endangered
Species Act (16 USCA sections 1531 to 1544). This Order requires compliance with
effluent limitations, receiving water limitations, and other requirements to protect the
beneficial uses of waters of the State. The Discharger is responsible for meeting all
requirements of the applicable Endangered Species Act.

Impaired Water Bodies on CWA 303(d) List
On November 12, 2010, USEPA approved the list of impaired water bodies, prepared by the
State Water Board pursuant to section 303(d) of the CWA, which are not expected to meet
applicable water quality standards after implementation of technology-based effluent
limitations for point sources. The 303(d) list for waters in the vicinity of the Tijuana River,
Tijuana River Estuary, and SBOO include:
1.

Pacific Ocean Shoreline, Otay Valley HA, at Carnation Ave and Camp Surf Jetty for total
coliform

2.

Pacific Ocean Shoreline, Imperial Beach Pier for fecal coliform, total coliform, and PCBs
(fish tissue)

3.

Pacific Ocean Shoreline, Tijuana HU, at end of Seacoast Drive for enterococcus, fecal
coliform, and total coliform

4.

Pacific Ocean Shoreline, Tijuana HU, at 3/4 mile North of Tijuana River for
enterococcus, fecal coliform, and total coliform

5.

Pacific Ocean Shoreline, Tijuana HU, at Tijuana River mouth for enterococcus, fecal
coliform, and total coliform

6.

Pacific Ocean Shoreline, Tijuana HU, at Monument Road for fecal coliform and total
coliform

7.

Pacific Ocean Shoreline, Tijuana HU, at the U.S. Border for enterococcus, fecal coliform,
and total coliform

8.

Tijuana River, Tijuana HU, eutrophic, indicator bacteria, low dissolved oxygen,
pesticides, phosphorus, sedimentation/ siltation, selenium, solids, surfactants (MBAS),
synthetic organics, total nitrogen as N, toxicity, trace elements, and trash.

9.

Tijuana River Estuary, Tijuana HU, eutrophic, indicator bacteria, lead, nickel, pesticides,
thallium, trash, and turbidity.

ATTACHMENT F – FACT SHEET

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152

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Currently, there is no effective total maximum daily load (TMDL) for the Pacific Ocean near
the SBOO. A draft TMDL is under development for the Tijuana River for solids, turbidity, and
trash.
E.

Other Plans, Polices and Regulations
1.

Secondary Treatment Regulations. 40 CFR part 133 establishes the minimum levels
of effluent quality to be achieved by secondary treatment. These limitations, established
by the USEPA, are incorporated into this Order, except where more stringent limitations
are required by other applicable plans, policies, or regulations.

2.

Storm Water. Sewage treatment works with a design flow of 1.0 MGD or greater are
required to comply with Water Quality Order No. 97-03-DWQ (NPDES General Permit
No. CAS000001), Waste Discharge Requirements for Dischargers of Storm Water
Associated with Industrial Activities, Excluding Construction Activities.

IV. RATIONALE FOR EFFLUENT LIMITATIONS AND DISCHARGE SPECIFICATIONS
The CWA requires point source dischargers to control the amount of conventional, nonconventional, and toxic pollutants that are discharged into the waters of the United States. The
control of pollutants discharged is established through effluent limitations and other requirements
in NPDES permits. There are two principal bases for effluent limitations in the Code of Federal
Regulations: 40 CFR section 122.44(a) requires that permits include applicable technology-based
limitations and standards; and 40 CFR section 122.44(d) requires that permits include water
quality-based effluent limitations to attain and maintain applicable numeric and narrative water
quality criteria to protect the beneficial uses of the receiving water.
A.

Discharge Prohibitions
This Order retains the discharge prohibitions from Order No. 96-50, as described below.
Compliance determination language is included in section VII of this Order to accurately
describe how violations of these prohibitions are determined. Discharges from the Facilities to
surface waters of the United States in violation of prohibitions contained in this Order are
violations of the CWA and therefore are subject to third party lawsuits. Discharges from the
Facilities to land that are not discharges to waters of the United States are violations
governed by the Water Code and are not subject to third party lawsuits under the CWA
because the Water Code does not contain provisions allowing third party lawsuits.
Discharge Prohibitions III.A through III.C have been carried over from Order No. 96-50.
Prohibition III.A clearly defines what types of discharges are prohibited. This prohibition is
based on 40 CFR section 122.21(a), duty to apply, and CWC section 13260, which requires
filing a ROWD before discharges can occur. Discharges not described in the ROWD, and
subsequently in this Order, are prohibited. Prohibition III.B and III.C include discharge
prohibitions of the Ocean Plan and the Basin Plan.
Order No. 96-50 prohibited bypassing of untreated wastes, except as provided for in 40 CFR
section 122.41(m). Because this prohibition is expressly included in Attachment D of this
Order, this requirement is not retained in section III of this Order.
Order No. 96-50 prohibited discharges to the Pacific Ocean through the SBOO in excess of a
25.0 MGD flow rate at any time unless the discharger obtains revised waste discharge
requirements authorizing an increased flow rate. Because this prohibition is now included as
an effluent limitation, this requirement is not retained in section III of this Order.
Order No. 96-50 prohibited discharges of waste to Areas of Special Biological Significance
and the discharge of sludge to the ocean. Because these prohibitions are expressly included
in the Ocean Plan prohibitions, which are included in this Order as Prohibition III.B and

ATTACHMENT F – FACT SHEET

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153

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

incorporated in Attachment G of this Order, these specific requirements are not retained in
section III of this Order.
B.

Technology-Based Effluent Limitations
1.

Scope and Authority
Section 301(b) of the CWA and implementing USEPA permit regulations at 40 CFR
section 122.44(a)(1) require that permits include conditions meeting applicable
technology-based requirements at a minimum, and any more stringent effluent limitations
necessary to meet applicable water quality standards.
Regulations promulgated in 40 CFR section 125.3 require technology-based effluent
limitations to be placed in NPDES permits.
The Federal Water Pollution Control Act Amendments of 1972 (PL 92-500) established
the minimum performance requirements attainable through the application of secondary
treatment [defined in 40 CFR section 304(d)(1)].
Based on this statutory requirement, USEPA developed secondary treatment
regulations, which are specified in 40 CFR part 133. These technology-based regulations
apply to all wastewater treatment plants and identify the minimum level of effluent quality
attainable by secondary treatment in terms of Biochemical Oxygen Demand (5-day)
(BOD5), TSS, and pH. In lieu of effluent limitations for BOD5 where BOD5 may not
provide a reliable measure of the oxygen demand of the effluent, 40 CFR section
133.102(a)(4) allows for effluent limitations for CBOD5 to be applied.
The Ocean Plan is applicable, in its entirety, to point source discharges to the ocean.
Therefore, the discharge of wastewater to the Pacific Ocean at Discharge Point No. 001
is subject to the Ocean Plan. The Ocean Plan establishes water quality objectives,
general requirements for management of waste discharged to the ocean, effluent quality
requirements for waste discharges, discharge prohibitions, and general provisions.
Further, Table 2 of the Ocean Plan establishes technology-based effluent limitations for
publicly-owned treatment works (POTW) and industrial discharges for which Effluent
Limitation Guidelines have not been established pursuant to sections 301, 302, or 306 of
the CWA (summarized in Table F-6 below). Although this Facility does not meet the
definition of a POTW, the Facility is a federally-owned treatment works that serves the
same functions. Thus, this Order established numeric effluent limitations based on Table
2 of the Ocean Plan.
The discharge authorized by this Order must meet minimum federal technology-based
requirements based on Secondary Treatment Standards at 40 CFR part 133 and
technology-based requirements contained in Table 2 of the Ocean Plan.

2.

Applicable Technology-Based Effluent Limitations
This Order does not retain the “Maximum at Any Time” (instantaneous maximum)
effluent limitations for CBOD5 and TSS contained in Order No. 96-50 which were
established using best professional judgment. Recent attempts to derive instantaneous
maximum effluent limitations based on the secondary treatment standards at 40 CFR
part 133 using appropriate statistical approaches did not yield results similar to the
previous instantaneous maximum effluent limitations; therefore, based on this new
information, retaining the previous instantaneous maximum effluent limitations for CBOD5
and TSS in this Order is not supported.
Technology-based regulations, specified in 40 CFR part 133, are summarized in the
table below.

ATTACHMENT F – FACT SHEET

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154

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Table F-8. Summary of Technology-Based Effluent Limitations Based on Secondary Treatment Standards
Parameter Monthly Average Weekly Average 30-day Percent Removal
CBOD5
25 mg/L
40 mg/L
85%
TSS
30 mg/L
45 mg/L
85%
pH
Effluent values shall remain within the limits of 6.0 to 9.0 at all times
Percent
The 30-day average percent removal of CBOD5 and TSS shall not
Removal
be less than 85 percent.

Technology-based regulations, specified in Table 2 of the Ocean Plan, are summarized
below:
Table F-9. Summary of Technology-Based Effluent Limitations Based on Table 2 of the Ocean Plan
Average
Average Instantaneous Instantaneous
Parameter
Unit
Monthly
Weekly
Minimum
Maximum
Grease and Oil
mg/L
25
40
75
TSS
mg/L
601
--Settleable Solids
mL/L
1.0
1.5
3.0
Turbidity
NTU
75
100
225
pH
standard units
--6.0
9.0
Dischargers shall, as a 30-day average, remove 75 percent of suspended
solids from the influent stream before discharging wastewaters to the
Percent Removal
ocean, except that the effluent limitation to be met shall not be lower than
60 mg/L.

Because secondary treatment standards contain effluent limitations for TSS that are
more stringent than Table 2 of the Ocean Plan, the more stringent effluent limitations for
TSS will be applied to discharges from the Facility.
The current permitted flow is an instantaneous maximum of 25 MGD based on the
Facility’s design capacity. As discussed in section II of this Fact Sheet, the Facility was
upgraded to provide secondary treatment. The advanced primary treatment facility has a
peak hydraulic capacity of 100 MGD, peak design flow rate of 75 MGD, and an average
design flow rate of 25 MGD. The secondary treatment design capacity is 25 MGD with a
peaking factor of approximately 2. Therefore, the effluent limitation for flow is being
modified to an average monthly flow rate of 25 MGD.
C.

Water Quality-Based Effluent Limitations (WQBELs)
1.

Scope and Authority
Section 301(b) of the CWA and 40 CFR section 122.44(d) require that permits include
limitations more stringent than applicable federal technology-based requirements where
necessary to achieve applicable water quality standards.
Section 122.44(d)(1)(i) of 40 CFR requires that permits include effluent limitations for all
pollutants that are or may be discharged at levels that have the reasonable potential to
cause or contribute to an exceedance of a water quality standard, including numeric and
narrative objectives within a standard. Where reasonable potential has been established
for a pollutant, but there is no numeric criterion or objective for the pollutant, water
quality-based effluent limitations (WQBELs) must be established using: (1) USEPA
criteria guidance under section 304(a) of the CWA, supplemented where necessary by
other relevant information; (2) an indicator parameter for the pollutant of concern; or (3) a
calculated numeric water quality criterion, such as a proposed state criterion or policy
interpreting the state’s narrative criterion, supplemented with other relevant information,
as provided in 40 CFR section 122.44(d)(1)(vi).

ATTACHMENT F – FACT SHEET

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U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

The process for determining reasonable potential and calculating WQBELs when
necessary is intended to protect the designated uses of the receiving water as specified
in the Basin Plan and Ocean Plan, and achieve applicable water quality objectives and
criteria that are contained in the Ocean Plan.
2.

Applicable Beneficial Uses and Water Quality Criteria and Objectives
The Basin Plan and Ocean Plan designate beneficial uses, establish water quality
objectives, and contain implementation programs and policies to achieve those
objectives for all waters.
a.

Basin Plan. The beneficial uses specified in the Basin Plan applicable to the Pacific
Ocean are summarized in section III.C.1 of this Fact Sheet.
The Basin Plan water quality objective for dissolved oxygen applicable to ocean
waters is stated as follows: “The dissolved oxygen concentration in ocean waters
shall not at any time be depressed more than 10 percent from that which occurs
naturally, as the result of the discharge of oxygen demanding waste materials”.
The Basin Plan includes water quality objectives for pH applicable to the receiving
water.
The Basin Plan states, “The pH value shall not be changed at any time more than
0.2 pH units from that which occurs naturally.”

b.

Ocean Plan. The beneficial uses specified in the Ocean Plan for the Pacific Ocean
are summarized in section III.C.2 of this Fact Sheet. The Ocean Plan also includes
water quality objectives for the ocean receiving water for bacterial characteristics,
physical characteristics, chemical characteristics, biological characteristics, and
radioactivity.
Table 1 of the Ocean Plan includes the following water quality objectives for toxic
pollutants and whole effluent toxicity:
i.

6-month median, daily maximum, and instantaneous maximum objectives for 21
chemicals and chemical characteristics, including total chlorine residual and
chronic toxicity, for the protection of marine aquatic life.

ii. 30-day average objectives for 20 non-carcinogenic chemicals for the protection
of human health.
iii. 30-day average objectives for 42 carcinogenic chemicals for the protection of
human health.
iv. Daily maximum objectives for acute and chronic toxicity.
3.

Determining the Need for WQBELs
Order No. 96-50 contained effluent limitations for non-conventional and toxic pollutant
parameters in Table B of the 1990 California Ocean Plan. For this Order, the need for
effluent limitations based on water quality objectives in Table 1 of the 2012 Ocean Plan
was re-evaluated in accordance with 40 CFR section 122.44(d) and guidance for
statistically determining the “reasonable potential” for a discharged pollutant to exceed
an objective, as outlined in the revised Technical Support Document for Water Quality-

ATTACHMENT F – FACT SHEET

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156

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Based Toxics Control (TSD; EPA/505/2-90-001, 1991) and the Ocean Plan Reasonable
Potential Analysis (RPA) Amendment that was adopted by the State Water Board on
April 21, 2005. The statistical approach combines knowledge of effluent variability (as
estimated by a coefficient of variation) with the uncertainty due to a limited amount of
effluent data to estimate a maximum effluent value at a high level of confidence. This
estimated maximum effluent value is based on a lognormal distribution of daily effluent
values. Projected receiving water values (based on the estimated maximum effluent
value or the reported maximum effluent value and minimum probable initial dilution) can
then be compared to the appropriate objective to determine the potential for an
exceedance of that objective and the need for an effluent limitation. According to the
Ocean Plan amendment, the RPA can yield three endpoints: 1) Endpoint 1, an effluent
limitation is required and monitoring is required; 2) Endpoint 2, an effluent limitation is not
required and the San Diego Water Board may require monitoring; 3) Endpoint 3, the RPA
is inconclusive, monitoring is required, and an existing effluent limitation may be retained
or a permit reopener clause may be included to allow inclusion of an effluent limitation if
future monitoring warrants the inclusion. Endpoint 3 is typically the result when there are
fewer than 16 data points and all are censored data (i.e., below quantitation or method
detection levels for an analytical procedure). If no data was provided for a parameter,
and an RPA could not be conducted for that parameter, reasonable potential for that
parameter was carried over to this Order based on the requirements of federal and State
anti-backsliding regulations. Data for all parameters was available to conduct an RPA.
The implementation provisions for Table 1 in section III.C of the Ocean Plan specify that
the minimum initial dilution is the lowest average initial dilution within any single month of
the year. Dilution estimates are to be based on observed waste flow characteristics,
observed receiving water density structure, and the assumption that no currents of
sufficient strength to influence the initial dilution process flow across the discharge
structure.
Prior to issuance of Order No. 96-50, the State Water Board had determined the
minimum initial dilution factor (Dm), expressed as parts seawater per part wastewater,
for the SBOO to be 100. This determination was based on 660 diffuser ports being open
and an average daily flow rate of 174 MGD, although, at the time, the total permitted flow
rate through the SBOO was only 25 MGD. Prior to issuance of Order No. R9-2006-0067,
NPDES Permit No. CA0109045, Waste Discharge Requirements for the City of San
Diego South Bay Water Reclamation Plant Discharge to the Pacific Ocean via the South
Bay Ocean Outfall, the Dm was recalculated in order to account for the maximum
permitted effluent flow through the SBOO (25 MGD from the Facility and 15 MGD from
SBWRP) and the current configuration of the diffuser (72 open ports). The new
recalculated Dm was determined as 94.6 using the USEPA approved computer modeling
application Visual Plumes with the UM3 model. There is insufficient data for the SBOO’s
effluent at this time to reevaluate Dm. Further, the Facility’s upgrade to secondary
treatment is expected to result in lower conductivity and thus more dilution. Therefore,
the current Dm of 94.6 will be applied to WQBELs established herein.
Conventional pollutants were not considered as part of the RPA. Technology-based
effluent limitations for these pollutants are included in this Order as described in section
IV.B of this Fact Sheet.
Using the RPcalc 2.0 software tool developed by the State Water Board for conducting
reasonable potential analyses, the San Diego Water Board has conducted the RPA for
the parameters listed in Table F-10. For parameters that do not display reasonable
potential, this Order includes desirable maximum effluent concentrations which were
ATTACHMENT F – FACT SHEET

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157

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

derived using effluent limitation determination procedures described below and are
referred to in this Order as “performance goals.” A narrative limit statement to comply
with all Ocean Plan objectives requirements is provided for those parameters not
displaying reasonable potential. The Discharger is required to monitor for these
parameters pursuant to the Monitoring and Reporting Program (MRP, Attachment E) in
order to gather data for use in reasonable potential analyses for future permit
reissuances.
Effluent data provided in the Discharger’s monitoring reports for the Facility from July
20121 to October 2013 were used in the RPA. A minimum probable initial dilution of 94.6
was considered in this evaluation.
A summary of the RPA results is provided below:
Table F-10. RPA Results Summary
Parameter

n1

MEC2,4

Arsenic
Cadmium
Chromium, Total Recoverable
Copper
Lead
Mercury
Nickel
Selenium
Silver
Zinc
Cyanide
Total Chlorine Residual
Ammonia
Acute Toxicity
Chronic Toxicity
Phenolic Compounds10
Chlorinated Phenolics10
Endosulfan10
Endrin
HCH10
Radioactivity
Acrolein
Antimony
Bis(2-chloroethoxyl)methane
Bis(2-chloroisopropyl)ether
Chlorobenzene
Chromium (III)
Di-n-butyl phthalate
Dichlorobenzenes10
Diethyl phthalate
Dimethyl phthalate
4,6-Dinitro-2-methylphenol
2,4-Dinitrophenol
1

Units10
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
TUa
TUc
µg/L
µg/L
µg/L
µg/L
µg/L
pCi/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L

61
61
61
61
61
61
59
60
57
61
57
423
61
57
50
65
65
56
57
57
-16
61
30
16
16
61
16
16
16
32
16
16

216
7.5
158
42.8
120
13.3
29.5
54.6
<0.7
1400
<0.02
0.2
39.4
8
200
<1.26
<2
<0.02
<0.002
<0.005
-<2.6
278
<0.27
<0.38
<0.31
158
<0.25
<0.55
<1
<0.22
<1
<1

Most
Stringent
Criteria
85
15
25
35
25
0.045
55
155
0.75
205
15
25
6005
0.37
17
305
15
0.0095
0.0025
0.0045
8

2209
1,2009
4.49
1,2009
5709
190,0009
3,5009
5,1009
33,0009
820,0009
2209
4.09

Background

RPA
Endpoint3

36
0
0
26
0
0.00056
0
0
0.166
86
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

2
2
2
2
2
1
2
2
2
1
2
2
2
1
1
2
2
2
2
2
-2
2
2
2
2
2
2
2
2
2
2
2

This time frame corresponds to the dates that the Discharger started to come into substantial compliance with
NPDES Permit effluent limitations, as explained in section II of this Fact Sheet.

ATTACHMENT F – FACT SHEET

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U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Parameter
Ethylbenzene
Fluoranthene
Hexachlorocyclopentadiene
Nitrobenzene
Thallium
Toluene
Tributyltin
1,1,1-Trichloroethane
Acrylonitrile
Aldrin
Benzene
Benzidine
Beryllium
Bis(2-chloroethyl) ether
Bis(2-ethylhexyl) phthalate
Carbon tetrachloride
Chlordane10
Chlorodibromomethane
(dibromochloromethane)
Chloroform
DDT10
1,4-Dichlorobenzene
3,3-Dichlorobenzidine
1,2-Dichloroethane
1,1-Dichloroethylene
Dichlorobromomethane
Dichloromethane
(Methylene Chloride)
1,3-dichloropropene
(1,3-Dichloropropylene)

Dieldrin
2,4-Dinitrotoluene
1,2-Diphenylhydrazine
Halomethanes10
Heptachlor
Heptachlor Epoxide
Hexachlorobenzene
Hexachlorobutadiene
Hexachloroethane
Isophorone
N-nitrosodimethylamine
N-nitrosodi-N-propylamine
N-nitrosodiphenylamine
PAHs10
PCBs10
TCDD equivalents10
1,1,2,2-Tetrachoroethane
Tetrachloroethylene
(Tetrachloroethene)
Toxaphene

ATTACHMENT F – FACT SHEET

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Units10

n1

MEC2,4

µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L

16
16
16
16
61
16
16
16
16
53
16
16
69
16
16
16
138

<0.38
<0.13
<1
<0.23
565
1.4
<0.004
<0.23
<1.5
<0.002
<0.47
<1
<1.8
<0.42
9
<0.38
<10

Most
Stringent
Criteria
4,1009
159
589
4.99
29
85,0009
0.00149
540,0009
0.109
0.0000229
5.99
0.0000699
0.0339
0.0459
3.59
0.909
0.0000239

16

<0.36

Background

RPA
Endpoint3

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

2
2
2
2
1
2
3
2
2
2
2
3
2
2
2
2
3

8.69

0

3

9

µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L

16
69
16
16
16
16
16

6.9
<3.007
<0.26
<0.0062
<0.25
<0.07
4.1

130
0.000179
189
0.00819
289
0.99
6.29

0
0
0
0
0
0
0

2
3
2
2
2
2
2

16

<0.43

4509

0

2

µg/L

16

<0.32

8.99

0

2

9

µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
µg/L
pg/L
µg/L
µg/L

69
16
16
16
69
69
16
16
16
16
69
69
69
60
65
14
16

<0.002
<0.45
<1
<2.43
<0.002
<0.003
<0.35
<0.56
<0.25
<0.64
<1
<0.58
<0.12
<0.34
<2.8
0.0001736
<0.42

0.00004
2.69
0.169
1309
0.000059
0.000029
0.000219
149
2.59
7309
7.39
0.389
2.59
0.00889
0.0000199
0.00000399
2.39

0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0

2
2
2
2
2
3
3
2
2
2
2
2
2
2
3
1
2

16

<0.31

2.09

0

2

µg/L

69

<0.5

0.000219

0

3

F-22

159

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Units10

Parameter
Trichloroethylene
(Trichloroethene)
1,1,2-Trichloroethane
2,4,6-Trichlorophenol
Vinyl Chloride
1
2
3

4
5
6
7
8

9

10

µg/L
µg/L
µg/L
µg/L

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

n1

MEC2,4

Most
Stringent
Criteria

Background

RPA
Endpoint3

16

<0.23

279

0

2

<0.34
<1
<0.47

9

0
0
0

2
2
2

16
69
16

9.4
0.299
369

Number of data points available for the RPA.
If there is a detected value, the highest reported value is summarized in the table. If there are no detected values, the
lowest MDL is summarized in the table.
End Point 1 – Reasonable Potential (RP) determined, limit required, monitoring required.
End Point 2 – Discharge determined not to have RP, monitoring may be established.
End Point 3 – RPA was inconclusive, carry over previous limitations if applicable, and establish monitoring.
Note that the reported MEC does not account for dilution. The RPA does account for dilution; therefore it is possible for
a parameter with an MEC in exceedance of the most stringent criteria not to present a RP (i.e. Endpoint 2).
Based on the 6-Month Median in the Table 1 of the Ocean Plan.
Background concentrations contained in Table 3 of the Ocean Plan.
Based on the Daily Maximum in Table 1 of the Ocean Plan.
Not to exceed limits specified in title 17, division 1, chapter 5, subchapter 4, group 3, article 3, section 30253 of the
California Code of Regulations. Levels of radioactivity that exceed the applicable criteria are not expected in the
discharge.
Based on 30-Day Average in Table 1 of the Ocean Plan.
See Attachment A for definitions of abbreviations and a glossary of common terms used in this Order.

Reasonable potential to cause or contribute to an exceedance of water quality objectives
contained within the Ocean Plan (i.e. Endpoint 1) was determined for zinc, mercury,
acute toxicity, chronic toxicity, TCDD equivalents, and thallium. Thus effluent limitations
for these parameters have been retained.
For parameters for which the RPA was inconclusive (Endpoint 3), reasonable potential
was not determined and effluent limitations are retained. Endpoint 3 applied to tributyltin,
benzidine, chlordane, chlorodibromomethane, DDT, heptachlor epoxide,
hexachlorobenzene, PCBs, and toxaphene. Thus effluent limitations for these
parameters were retained.
Consistent with 40 CFR section 122.44(I)(2)(i)(B), effluent limitations from Order No. 9650 were not retained for parameters for which there was no RP (Endpoint 2). Instead,
performance goals have been assigned for these parameters.
The monitoring requirements in Attachment E of this Order are designed to obtain
additional information for these constituents to determine if reasonable potential exists
for these parameters in future permit renewals and/or updates.
4.

WQBEL Calculations
a.

From the Table 1 water quality objectives of the Ocean Plan, effluent limitations and
performance goals are calculated according to the following equations:
For all pollutants, except for acute toxicity (if applicable) and radioactivity:
Ce = Co + Dm (Co – Cs) where,
Ce = the effluent limitation (μg/L)
Co = the water quality objective to be met at the completion of initial dilution
(μg/L)

ATTACHMENT F – FACT SHEET

F-23

160

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Cs =
Plan

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

background seawater concentration (μg/L), from Table 3 of the Ocean

Dm = minimum probable initial dilution expressed as parts seawater per part
wastewater
For acute toxicity (if applicable):
Ce = Ca + (0.1) Dm (Ca) where,
Ce = the effluent limitation
Ca = the concentration (water quality objective) to be met at the edge of the
acute mixing zone
Dm = minimum probable initial dilution expressed as parts seawater per part
wastewater (This equation applies only when Dm > 24)
b.

As discussed in section IV.C.3 above, the Dm has been determined to be 94.6 by
the San Diego Water Board through the application of USEPA’s dilution model,
Visual Plumes.

c.

Table 3 of the Ocean Plan establishes background concentrations for some
pollutants to be used when determining reasonable potential (represented as “Cs”).
In accordance with Table 1 implementing procedures, Cs equals zero for all
pollutants not established in Table 3. The background concentrations provided in
Table 3 are summarized below:
Table F-11. Pollutants Having Background Concentrations
Pollutant
Arsenic
Copper
Mercury
Silver
Zinc

d.

Background Seawater Concentration
3 µg/L
2 µg/L
0.0005 µg/L
0.16 µg/L
8 µg/L

Section 122.45(f)(1) of 40 CFR requires effluent limitations be expressed in terms of
mass, with some exceptions, and 40 CFR section 122.45(f)(2) allows pollutants that
are limited in terms of mass to additionally be limited in terms of other units of
measurement. Section III.C.4.j of the Ocean Plan requires that mass emission rate
limitations be established in addition to the effluent concentration limitations for all
Table 1 parameters. This Order includes effluent limitations expressed in terms of
mass and concentration. In addition, pursuant to the exceptions to mass limitations
provided in 40 CFR section 122.45(f)(1), some effluent limitations are not expressed
in terms of mass, such as pH and temperature. Exceptions to mass limitations are
also allowable where effluent limitations are based on applicable standards
expressed in terms of concentration (e.g., CTR criteria and MCLs) and mass
limitations are not necessary to protect the beneficial uses of the receiving water.
Mass-based effluent limitations were calculated using the following equation:
lb/day = Permitted Flow (MGD) x Pollutant Concentration (mg/L) x 8.34

ATTACHMENT F – FACT SHEET

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161

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

e.

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

The calculations for the effluent limitations for zinc are shown below as an example
of how effluent limitations and performance goals have been calculated.
Table F-12. Water Quality Objectives from the Ocean Plan for Zinc
Parameter

Units

zinc

µg/L

6-Month
Median
20

Daily
Maximum
80

Instantaneous
Maximum
200

Using the equations in sections IV.C.4.a and d above, effluent limitations are calculated
for zinc as follows.
Ce = Co + Dm (Co – Cs)
Ce = 2 + 94.6 (20 – 0) = 1,155.2 µg/L (6-Month Median)
Ce = 8 + 94.6 (80 – 0) = 6,891.2 µg/L (Daily Maximum)
Ce = 60 + 94.6 (200 – 0) = 18,363.2 µg/L (Instantaneous Maximum)

lb/day = Permitted Flow (MGD) x Pollutant Concentration (mg/L) x 8.34
lb/day = 25 MGD x 1.1552 mg/L x 8.34 = 241 lb/day
lb/day = 25 MGD x 6.8912 mg/L x 8.34 = 1437 lb/day
lb/day = 25 MGD x 1.83632 mg/L x 8.34 = 3829 lb/day
Due to a decrease in the minimum probable initial dilution (explained in section
IV.C.3 above), the calculated effluent limitations for zinc are less than those in the
previous Order.
Based on the implementing procedures described above, effluent limitations and
performance goals have been calculated for all pollutants in Table 1 of the Ocean
Plan and incorporated into this Order.
f.

A summary of the WQBELs established in this Order is provided below:

Table F-13. Summary of Water Quality-based Effluent Limitations, Discharge Point No. 001
Water Quality-Based Effluent Limitations2
Parameter
Unit
6-Month
Maximum
Instantaneous
30-Day
Median
Daily
Maximum
Average
BASED ON OCEAN PLAN OBJECTIVES FOR PROTECTION OF MARINE AQUATIC LIFE
1

Mercury, Total
Recoverable
Zinc

µg/L

3.78E+00

1.52E+01

3.82E+01

lbs/day
µg/L

7.87E-01
1.16E+03

3.18E+00
6.89E+03

7.96E+00
1.84E+04

---

lbs/day

2.41E+02

1.44E+03

3.83E+03

Acute Toxicity

TUa

--

3.2

--

--

Chronic Toxicity

TUc

--

95.6

--

--

ATTACHMENT F – FACT SHEET

F-25

162

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

BASED ON OCEAN OBJECTIVES FOR PROTECTION OF HUMAN HEALTH – CARCINOGENS
--

1.91E+02

lbs/day

--

--

--

--

--

--

3.99E+01
1.34E-01

--

--

--

2.79E-02

--

--

--

6.60E-03

lbs/day

--

--

--

1.38E-03

µg/L

Chlorodibromomethane
(dibromochloromethane)

--

--

--

2.20E-03

lbs/day

Chlordane1

--

--

--

4.58E-04

µg/L

--

--

--

8.22E+02

lbs/day

--

--

--

1.71E+02

µg/L

Heptachlor Epoxide
Hexachlorobenzene

1.63E-02

lbs/day

DDT1

3.39E-03

µg/L

--

--

--

1.91E-03

lbs/day

--

--

--

3.99E-04

--

µg/L

--

--

2.01E-02

--

--

4.19E-03

--

--

--

1.82E-03

--

--

--

3.79E-04

µg/L

--

--

--

3.73E-07

lbs/day

--

--

--

7.77E-08

µg/L

--

--

--

2.01E-02

lbs/day

Toxaphene

--

lbs/day

TCDD equivalents1

lbs/day
µg/L

PCBs1

1
2

--

µg/L

Benzidine

--

lbs/day

Tributyltin

µg/L
µg/L

Thallium, Total
Recoverable

--

--

--

4.19E-03

See Attachment A for definitions of abbreviations and a glossary of common terms used in this Order.
Scientific “E” notation is used to express certain values. In scientific “E” notation, the number following the “E”
indicates that position of the decimal point in the value. Negative numbers after the “E” indicate that the value is less
than 1, and positive numbers after the “E” indicate that the value is greater than 1. In this notation a value of 6.1E-02
represents 6.1 x 10-2 or 0.061, 6.1E+02 represents 6.1 x 102 or 610, and 6.1E+00 represents 6.1 x 100 or 6.1.

g.

Parameters that do not have reasonable potential (as determined in section IV.C.3
of this Fact Sheet) are listed as performance goals in this Order. Performance goals
serve to ensure existing treatment levels and effluent quality is sufficient to support
State and federal antidegradation policies. Additionally, performance goals provide
all interested parties with information regarding the expected levels of pollutants in
the discharge that should not be exceeded in order to maintain the water quality
objectives established in the Ocean Plan. Performance goals are not limitations or
standards for the regulation of the discharge. Effluent concentrations above the
performance goals will not be considered as violations of the permit, but serve as
red flags that indicate water quality concerns. Repeated red flags may prompt the
San Diego Water Board to reopen and amend the permit to replace performance
goals for parameters of concern with effluent limitations, or the San Diego Water
Board may coordinate such actions with the next permit renewal.

ATTACHMENT F – FACT SHEET

F-26

163

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

The following table lists the performance goals established by this Order. A
minimum probable initial dilution factor of 94.6:1 was used in establishing the
performance goals.
Table F-14. Summary of Performance Goals
Performance Goals2
Parameter
Unit
6-Month
Maximum
Instantaneous
30-Day
Median
Daily
Maximum
Average
BASED ON OCEAN PLAN OBJECTIVES FOR PROTECTION OF MARINE AQUATIC LIFE
1

Arsenic, Total Recoverable
Cadmium, Total
Recoverable
Chromium VI, Total
Recoverable 3
Copper, Total Recoverable
Lead, Total Recoverable
Nickel, Total Recoverable
Selenium, Total
Recoverable
Silver, Total Recoverable
Cyanide, Total
Recoverable 4
Total Chlorine Residual5

µg/L

4.81E+02

2.78E+03

7.36E+03

--

lbs/day

1.00E+02

5.79E+02

1.54E+03

--

µg/L

9.56E+01

3.82E+02

9.56E+02

--

lbs/day

1.99E+01

7.97E+01

1.99E+02

--

µg/L

1.91E+02

7.65E+02

1.91E+03

--

lbs/day

3.99E+01

1.59E+02

3.99E+02

--

µg/L

9.76E+01

9.58E+02

2.68E+03

lbs/day

2.03E+01

2.00E+02

5.59E+02

µg/L

1.91E+02

7.65E+02

1.91E+03

--

lbs/day

3.99E+01

1.59E+02

3.99E+02

--

µg/L

4.78E+02

1.91E+03

4.78E+03

--

lbs/day

9.97E+01

3.99E+02

9.97E+02

--

µg/L

1.43E+03

5.74E+03

1.43E+04

--

lbs/day

2.99E+02

1.20E+03

2.99E+03

--

µg/L

5.18E+01

2.53E+02

6.54E+02

--

lbs/day

1.08E+01

5.27E+01

1.36E+02

--

µg/L

9.56E+01

3.82E+02

9.56E+02

--

lbs/day

1.99E+01

7.97E+01

1.99E+02

--

µg/L

1.91E+02

7.65E+02

5.74E+03

lbs/day

3.99E+01

1.59E+02

1.20E+03

Ammonia (expressed as
nitrogen)

µg/L

5.74E+04

2.29E+05

5.74E+05

--

lbs/day

1.20E+04

4.78E+04

1.20E+05

--

Phenolic Compounds
(non-chlorinated)1

µg/L

2.87E+03

1.15E+04

2.87E+04

--

lbs/day

5.98E+02

2.39E+03

5.98E+03

--

µg/L

9.56E+01

3.82E+02

9.56E+02

--

lbs/day

1.99E+01

7.97E+01

1.99E+02

--

µg/L

8.60E-01

1.72E+00

2.58E+00

--

lbs/day

1.79E-01

3.59E-01

5.38E-01

--

µg/L

1.91E-01

3.82E-01

5.74E-01

lbs/day

3.99E-02

7.97E-02

1.20E-01

µg/L

3.82E-01

7.65E-01

1.15E+00

lbs/day

7.97E-02

1.59E-01

2.39E-01

Chlorinated Phenolics1
Endosulfan1
Endrin
HCH1

ATTACHMENT F – FACT SHEET

F-27

164

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Parameter

Radioactivity

Unit

1

pCi/l

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Performance Goals2
6-Month
Maximum
Instantaneous
30-Day
Median
Daily
Maximum
Average
Not to exceed limits specified in title 17, division 1, chapter 5,
subchapter 4, group 3, article 3, section 30253 of the California
Code of Regulations, Reference to section 30253 is prospective,
including future changes to any incorporated provisions of federal
law, as the changes take effect.

BASED ON OCEAN PLAN OBJECTIVES FOR PROTECTION OF HUMAN HEALTH – NONCARCINOGENS
Acrolein
Antimony
Bis(2-chloroethoxy)
Methane
Bis(2-chloroisopropyl)
Ether
Chlorobenzene
Chromium (III), Total
Recoverable3
Di-n-butyl Phthalate
Dichlorobenzenes1
Diethyl Phthalate
Dimethyl Phthalate
4,6-dinitro-2-methylphenol
2,4-dinitrophenol
Ethylbenzene

µg/L

--

--

--

2.10E+04

lbs/day

--

--

--

4.39E+03

µg/L

--

--

--

1.15E+05

lbs/day

--

--

--

2.39E+04

µg/L

--

--

--

4.21E+02

lbs/day

--

--

--

8.77E+01

µg/L

--

--

--

1.15E+05

lbs/day

--

--

--

2.39E+04

µg/L

--

--

--

5.45E+04

lbs/day

--

--

--

µg/L

1.14E+04
1.82E+07

lbs/day

3.79E+06

µg/L

--

--

--

3.35E+05

lbs/day

--

--

--

6.98E+04

µg/L

--

--

--

4.88E+05

lbs/day

--

--

--

1.02E+05

µg/L

--

--

--

3.15E+06

lbs/day

--

--

--

6.58E+05

µg/L

--

--

--

7.84E+07

lbs/day

--

--

--

1.63E+07

µg/L

--

--

--

2.10E+04

lbs/day

--

--

--

4.39E+03

µg/L

--

--

--

3.82E+02

lbs/day

--

--

--

7.97E+01

µg/L

--

--

--

3.92E+05

lbs/day

--

--

--

8.17E+04

ATTACHMENT F – FACT SHEET

F-28

165

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Parameter

Fluoranthene
Hexachlorocyclopentadien
e
Nitrobenzene
Toluene
1,1,1-trichloroethane

Unit

1

µg/L

6-Month
Median
--

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Performance Goals2
Maximum
Instantaneous
Daily
Maximum
---

30-Day
Average
1.43E+03

lbs/day

--

--

--

2.99E+02

µg/L

--

--

--

5.54E+03

lbs/day

--

--

--

1.16E+03

µg/L

--

--

--

4.68E+02

lbs/day

--

--

--

9.77E+01

µg/L

--

--

--

8.13E+06

lbs/day

--

--

--

1.69E+06

µg/L

--

--

--

5.16E+07

lbs/day

--

--

--

1.08E+07

BASED ON OCEAN PLAN OBJECTIVES FOR PROTECTION OF HUMAN HEALTH - CARCINOGENS
Acrylonitrile
Aldrin
Benzene
Beryllium
Bis(2-chloroethyl) Ether
Bis(2-ethlyhexyl) Phthalate
Carbon Tetrachloride
Chloroform
1,4-dichlorobenzene
3,3'-dichlorobenzidine
1,2-dichloroethane
1,1-dichloroethylene
Dichlorobromomethane

µg/L

--

--

--

9.56E+00

lbs/day

--

--

--

1.99E+00

µg/L

--

--

--

2.10E-03

lbs/day

--

--

--

4.39E-04

µg/L

--

--

--

5.64E+02

lbs/day

--

--

--

1.18E+02

µg/L

--

--

--

3.15E+00

lbs/day

--

--

--

6.58E-01

µg/L

--

--

--

4.30E+00

lbs/day

--

--

--

8.97E-01

µg/L

--

--

--

3.35E+02

lbs/day

--

--

--

6.98E+01

µg/L

--

--

--

8.60E+01

lbs/day

--

--

--

1.79E+01

µg/L

--

--

--

1.24E+04

lbs/day

--

--

--

2.59E+03

µg/L

--

--

--

1.72E+03

lbs/day

--

--

--

3.59E+02

µg/L

--

--

--

7.74E-01

lbs/day

--

--

--

1.61E-01

µg/L

--

--

--

2.68E+03

lbs/day

--

--

--

5.58E+02

µg/L

--

--

--

8.60E+01

lbs/day

--

--

--

1.79E+01

µg/L

--

--

--

5.93E+02

lbs/day

--

--

--

1.24E+02

ATTACHMENT F – FACT SHEET

F-29

166

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Parameter
Dichloromethane
(Methylene Chloride)

Unit

1

µg/L

6-Month
Median
--

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Performance Goals2
Maximum
Instantaneous
Daily
Maximum
---

30-Day
Average
4.30E+04

Dieldrin
2,4-dinitrotoluene
1,2-diphenylhydrazine
Halomethanes1
heptachlor
Hexachlorobutadiene
Hexachloroethane
Isophorone
N-nitrosodimethylamine
N-nitrosodi-N-propylamine
N-nitrosodiphenylamine
PAH1
1,1,2,2-tetrachloroethane
Tetrachloroethylene
(Tetrachloroethene)
Trichloroethylene
(Trichloroethene)
1,1,2-trichloroethane
2,4,6-trichlorophenol

--

--

--

8.97E+03

µg/L

--

--

--

8.51E+02

lbs/day

--

--

--

1.77E+02

µg/L

--

--

--

3.82E-03

lbs/day

--

--

--

7.97E-04

µg/L

--

--

--

2.49E+02

lbs/day

--

--

--

5.18E+01

µg/L

--

--

--

1.53E+01

lbs/day

--

--

--

3.19E+00

µg/L

1,3-dichloropropene
(1,3-Dichloropropylene)

lbs/day

--

--

--

1.24E+04

lbs/day

--

--

--

µg/L

--

--

--

4.78E-03

2.59E+03

lbs/day

--

--

--

9.97E-04

µg/L

--

--

--

1.34E+03

lbs/day

--

--

--

2.79E+02

µg/L

--

--

--

2.39E+02

lbs/day

--

--

--

4.98E+01

µg/L

--

--

--

6.98E+04

lbs/day

--

--

--

1.46E+04

µg/L

--

--

--

6.98E+04

lbs/day

--

--

--

1.46E+04

µg/L

--

--

--

3.63E+01

lbs/day

--

--

--

7.57E+00

µg/L

--

--

--

2.39E+02

lbs/day

--

--

--

4.98E+01

µg/L

--

--

--

8.41E-01

lbs/day

--

--

--

1.75E-01

µg/L

--

--

--

2.20E+02

lbs/day

--

--

--

4.58E+01

µg/L

--

--

--

1.91E+02

lbs/day

--

--

--

3.99E+01

µg/L

--

--

--

2.58E+03

lbs/day

---

---

---

5.38E+02
8.99E+02

--

--

--

1.87E+02

µg/L

--

--

--

2.77E+01

lbs/day

--

--

--

5.78E+00

µg/L
lbs/day

ATTACHMENT F – FACT SHEET

F-30

167

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Parameter

µg/L

Vinyl Chloride
1
2

Unit

1

lbs/day

6-Month
Median
---

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Performance Goals2
Maximum
Instantaneous
Daily
Maximum
----

--

30-Day
Average
3.44E+03
7.18E+02

See Attachment A for definitions of abbreviations and a glossary of common terms used in this Order.
Scientific “E” notation is used to express certain values. In scientific “E” notation, the number following the “E”
indicates that position of the decimal point in the value. Negative numbers after the “E” indicate that the value is less
than 1, and positive numbers after the “E” indicate that the value is greater than 1. In this notation a value of 6.1E-02
represents 6.1 x 10-2 or 0.061, 6.1E+02 represents 6.1 x 102 or 610, and 6.1E+00 represents 6.1 x 100 or 6.1.
The Discharger may, at their option, apply this performance goal as a total chromium performance goal.
If a Discharger can demonstrate to the satisfaction of the San Diego Water Board (subject to USEPA approval) that
an analytical method is available to reliably distinguish between strongly and weakly complexed cyanide, effluent
limitations for cyanide may be met by (or performance goals may be evaluated with) the combined measurement of
free cyanide, simple alkali metals cyanides, and weakly complexed organometallic cyanide complexes. In order for
the analytical method to be acceptable, the recovery of free cyanide from metal complexes must be comparable to
that achieved by the approved method in 40 CFR part 136, as revised May 14, 1999.
The water quality objectives for total chlorine residual applicable to intermittent discharges not exceeding two hours,
shall be determined through the use of the following equation:
log y =-0.43 (log x) + 1.8,
where y =the water quality objective (in µg/l) to apply when chlorine is being discharged;
x =the duration of uninterrupted chlorine discharge in minutes.
Actual effluent limitations for total chlorine, when discharging intermittently, shall then be determined according to
Implementation Procedures for Table 1from the Ocean Plan, using a minimum probable initial dilution factor of 94.6
and a flow rate of 25 MGD.

3
4

5

5.

Whole Effluent Toxicity (WET)
a.

b.

D.

Implementing provisions at section III.C.4.c.(4) of the Ocean Plan state that the
Discharger shall conduct chronic toxicity monitoring for ocean waste discharges with
minimum initial dilution factors that fall below 100:1. In addition, the RPA for chronic
toxicity resulted in Endpoint 1 and the effluent limitation was carried over from Order
No. 96-50. Thus monitoring is required to determine compliance with the effluent
limitation. Based on methods of the Ocean Plan, a maximum daily effluent limitation
of 95.6 TUc is established in the Order and weekly monitoring is carried over from
Order No. 96-50.
Order No. 96-50 required acute toxicity monitoring in addition to chronic toxicity
monitoring. The Ocean Plan does not require acute toxicity monitoring for
dischargers with a minimum initial dilution factor less than 100:1.The RPA, however,
resulted in Endpoint 1 for acute toxicity and monitoring is required to determine
compliance with the effluent limitation. Thus, the effluent limitation and weekly
monitoring for acute toxicity from Order No. 96-50 has been carried over to this
Order.

Final Effluent Limitation Considerations
1.

Anti-Backsliding Requirements
Sections 402(o) and 303(d)(4) of the CWA and federal regulations at 40 CFR section
122.44(l) prohibit backsliding in NPDES permits (see section III.C.5 of this Fact Sheet).
These anti-backsliding provisions require effluent limitations in a reissued permit to be as
stringent as those in the previous permit, with some exceptions where limitations may be
relaxed. The effluent limitations in this Order are at least as stringent as the effluent

ATTACHMENT F – FACT SHEET

F-31

168

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

limitations in the previous Order (Order No. 96-50), with the exception of a) “Maximum at
Any Time”(instantaneous maximum) effluent limitations for CBOD5 and TSS and b) other
effluent limitations that were not retained for parameters for which there was no RP
(Endpoint 2). The removal of these effluent limitations from this Order is consistent with
the federal anti-backsliding requirements for the reasons set forth below.
As explained in section IV.B.2 of this Fact Sheet, the instantaneous maximum effluent
limitations for CBOD5 and TSS of 45 mg/L and 50 mg\L respectively were not carried
over to this Order. These limitations were established by the San Diego Water Board
based on best professional judgment (BPJ). Recent attempts to derive instantaneous
maximum effluent limitations based on USEPA secondary treatment standards at 40
CFR part 133 using appropriate statistical approaches demonstrated that retaining the
previous instantaneous maximum effluent limitations for CBOD5 and TSS in this Order
was not supported. This Order does retain average monthly and average weekly effluent
limitations (AMEL and AWEL) for CBOD5 and TSS which are based on USEPA
secondary treatment standards for POTWs practicing a combination of physical and
biological treatment to remove biodegradable organic matter and suspended solids. The
AMEL and AWEL for CBOD5 and TSS are expected to ensure the Discharger maintains
the same level of treatment required in the previous Order and no degradation of the
effluent quality is expected. Anti-backsliding regulations found at 40 CFR 122.44(l)
prohibit reissuing or modifying an NPDES permit to include effluent limitations less
stringent than in the previous permit, unless one of the exceptions described in 40 CFR
122.44(l) are met. In this instance, the San Diego Water Board has determined that
removal of the instantaneous maximum effluent limitations for CBOD5 and TSS effluent
limitations is appropriate under the exception described in 40 CFR 122.44(l)(2)(i)(B)(2)
because these effluent limitations were based on a technical mistake.
As discussed in section IV.C.3 of this Fact Sheet, effluent limitations from Order No. 9650 are not retained for parameters for which RPA results indicated Endpoint 2; instead
performance goals have been assigned for these parameters. Parameters for which
Endpoint 2 was indicated are determined not to have reasonable potential, thus it is
inappropriate to establish effluent limitations for these parameters. Effluent limitations
have been removed for parameters for which new data is available, and a reasonable
potential analysis determined that reasonable potential does not exist, as allowed under
40 CFR section 122(l)(2)(i)(B). Performance goals have been established in their place.
The monitoring requirements in Attachment E of this Order are designed to obtain
additional information for these parameters to determine if reasonable potential exists for
these parameters in future permit renewals and/or updates. The removal of the effluent
limitations for parameters where Endpoint 2 is appropriate under the exceptions
described in 40 CFR 122.44(I)(2)(i)(A) and (B)(1),.which specify that permits may include
a less stringent effluent limitation than the previous permit, if 1) Material and substantial
alterations or additions to the permitted facility occurred after permit issuance which
justify the application of a less stringent effluent limitation; or 2) Information is available
which was not available at the time of permit issuance (other than revised regulations,
guidance, or test methods) and which would have justified the application of a less
stringent effluent limitation at the time of permit issuance.
Based on all of these considerations, this permit (Order) complies with all applicable
federal and State anti-backsliding regulations.

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2.

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Antidegradation Policies
WDRs for the Discharger must conform with antidegradation requirements discussed in
section III.C.4 of this Fact Sheet.
As explained in section IV.B.2 of this Fact Sheet, this Order does not retain the
instantaneous maximum effluent limitations for CBOD5 and TSS contained in Order No.
96-50. The AMEL and AWEL for CBOD5 and TSS, however, have been retained in this
Order. The AMEL and AWEL are expected to ensure the Discharger maintains the same
level of treatment and no degradation of the receiving water is expected. Thus, the
removal of the instantaneous maximum effluent limitations for CBOD5 and TSS is
consistent with State and federal antidegradation policy.
This Order has been modified from Order No. 96-50, to replace WQBELs for some
parameters with performance goals based on an RPA. The procedures for conducting
the RPA are explained in section IV.C.3 of this Fact Sheet. Performance goals were
included in the Order for parameters determined not to have reasonable potential to
exceed the water quality objectives, and thus, for which WQBELs were not included.
Performance goals will indicate the level of discharge at which possible water quality
impacts may be significant. The removal of WQBELs by itself is not expected to cause a
change in the physical nature of the effluent discharged and is not expected to impact
beneficial uses nor cause a reduction of the water quality of the receiving water. Coupled
with the inclusion of performance goals and retention of the monitoring program for
parameters without WQBELs, the existing water quality is expected to be maintained.
For these reasons, an antidegradation analysis is not required to consider the possible
impacts resulting from the removal of WQBELs following an RPA.
This permit complies with the antidegradation provision of 40 CFR section 131.12 and
State Water Board Resolution No. 68-16.

3.

Stringency of Requirements for Individual Pollutants
This Order contains both technology-based effluent limitations and WQBELs for
individual pollutants. The technology-based effluent limitations consist of restrictions on
CBOD5, TSS, oil and grease, settleable solids, turbidity, and pH, which are discussed in
section IV.B of this Fact Sheet. This Order’s technology-based pollutant restrictions
implement the minimum, applicable federal technology-based requirements. These
limitations are not more stringent than required by the CWA.
WQBELs have been derived to implement water quality objectives that protect beneficial
uses. Both the beneficial uses and the water quality objectives have been approved
pursuant to federal law and are the applicable federal water quality standards. The
procedures for calculating the individual WQBELs are based on the Ocean Plan, which
was approved by USEPA on August 19, 2013. All beneficial uses and water quality
objectives contained in the Basin Plan were approved under state law and submitted to
and approved by USEPA prior to May 30, 2000. Any water quality objectives and
beneficial uses submitted to USEPA prior to May 30, 2000, but not approved by USEPA
before that date, are nonetheless “applicable water quality standards for purposes of the
CWA” pursuant to 40 CFR section 131.21(c)(1). Collectively, this Order’s restrictions on
individual pollutants are no more stringent than required to implement the requirements
of the CWA.

E.

Interim Effluent Limitations – Not Applicable

F.

Land Discharge Specifications – Not Applicable

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U.S. Section of the International Boundary And Water Commission
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G.
V.

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Recycling Specifications – Not Applicable

RATIONALE FOR RECEIVING WATER LIMITATIONS
Receiving water limitations of this Order are derived from the water quality objectives for ocean
waters established by the Basin Plan and the Ocean Plan.
Prior to 2009, the San Diego Water Board interpreted the Bacterial Characteristics Water-contact
Standards of the Ocean Plan (Receiving Water Limitations section V.A.1) to apply only in the zone
bounded by the shoreline and a distance 1,000 feet from the shoreline or the 30-foot depth
contour, whichever is further from the shoreline, and within kelp beds. The Ocean Plan provides
that these Bacteriological Standards also apply in designated areas outside this zone used for
water contact sports, as determined by the Regional Water Boards (i.e., all waters designated with
the REC-1 beneficial use). These designated areas must be specifically defined in the Basin Plan.
Because the San Diego Water Board has designated the ocean waters with the REC-1 beneficial
use in the Basin Plan, the Ocean Plan Bacterial Standards apply throughout State of California
territorial marine waters in the San Diego Region, which extend from surface to bottom, out to
three nautical miles from the shoreline. This interpretation has been confirmed by the USEPA.

VI. RATIONALE FOR PROVISIONS
A.

Standard Provisions
Standard Provisions, which apply to all NPDES permits in accordance with 40 CFR section
122.41, and additional conditions applicable to specified categories of permits in accordance
with 40 CFR section 122.42, are provided in Attachment D of this Order.
Sections 122.41(a)(1) and (b) through (n) of 40 CFR establish conditions that apply to all
State-issued NPDES permits. These conditions must be incorporated into the permits either
expressly or by reference. If incorporated by reference, a specific citation to the regulations
must be included in the Order. Section 123.25(a)(12) of 40 CFR allows the state to omit or
modify conditions to impose more stringent requirements. In accordance with 40 CFR section
123.25, this Order omits federal conditions that address enforcement authority specified in 40
CFR sections 122.41(j)(5) and (k)(2) because the enforcement authority under the Water
Code is more stringent. In lieu of these conditions, this Order incorporates by reference Water
Code section 13387(e).

B.

Special Provisions
1.

Reopener Provisions
This Order may be reopened and modified, revoked and reissued, or terminated in
accordance with the provisions of 40 CFR parts 122, 123, 124, and 125. The San Diego
Water Board may reopen the permit to modify permit conditions and requirements.
Causes for modifications include, but are not limited to, increased/ modified receiving
water requirements and participation in the Southern California Coastal Water Research
Project (SCCWRP) model monitoring program; the promulgation of new regulations;
modification in sludge use or disposal practices; or adoption of new regulations by the
State Water Board or the San Diego Water Board, including revisions to the Basin Plan.

2.

Special Studies and Additional Monitoring Requirements
a.

Spill and Transboundary Wastewater Flow Prevention and Response Plan
i.

Discharges of Wastewater and Other Materials
The CWA largely prohibits any discharge of pollutants from point sources to
waters of the United States except as authorized under an NPDES permit. In

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Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

general, any point source discharge of sewage effluent to waters of the United
States must comply with technology-based, secondary treatment standards, at a
minimum, and any more stringent requirements necessary to meet applicable
water quality standards and other requirements. The unpermitted discharge of
wastewater to waters of the United States is illegal under the CWA. Further, the
Basin Plan prohibits discharges of waste to land, except as authorized by
WDR’s or the terms described in Water Code section 13264. The Basin Plan
also prohibits the unauthorized discharge of treated or untreated sewage to
waters of the State or to a storm water conveyance system. Further, Discharge
Prohibition III.A of the Order prohibits the discharge of waste from the Facilities
to a location other than Discharge Point No. 001.
Sanitary collection and treatment systems experience periodic failures resulting
in discharges that may affect waters of the State and the environment. There are
many factors which may affect the likelihood of a spill. To ensure appropriate
funding, management, and planning to reduce the likelihood of a spill, and
increase the spill preparedness, this Order requires the Discharger to maintain
and implement a Spill and Transboundary Wastewater Flow Prevention and
Response Plan (Prevention/Response Plan).
ii. Transboundary Flows Containing Wastewater
IBWC Minute No. 283 states, “[t]he Government of Mexico will assure that there
are no discharges of treated or untreated domestic or industrial wastewaters into
waters of the Tijuana River that cross the international boundary, and that in the
event of a breakdown in collection or other detention facilities designed to
prevent such discharges, the Government of Mexico will take special measures
to immediately stop such discharges and make repairs. Should Mexico request it
through the Commission, the United States Section will attempt to assist with
equipment and other resources in the containment of such discharges and
temporary repairs under the supervision of the Commission.”
The 1944 Water Treaty (Treaty for the Utilization of Waters of the Colorado and
Tijuana Rivers and of the Rio Grande), states that the government of the U.S.
and Mexico shall share the responsibility of border sanitation problems.
This Order requires the Prevention/Response Plan to contain provisions to
maximize treatment capacity utilization on both sides of the international border
and minimize transboundary wastewater flows to fulfill the agreements
contained in the 1944 Water Treaty and IBWC Minute No. 283. These
requirements shall serve as an indicator to the San Diego Water Board of the
Discharger’s ability to adequately coordinate flows between the facilities on both
sides of the international border and to better respond to emergencies on either
sides of the international border. Emergencies include, but are not limited to,
reduction or catastrophic loss of service, which could cause or contribute to a
degradation of water quality in the Tijuana River and its tributaries or present an
elevated risk to public health and safety in the South Bay region.

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U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

iii. Canyon Collectors
On July 2, 1990, the United States and Mexican sections of the IBWC signed
IBWC Minute No. 283 titled Conceptual Plan for the International Solution to the
Border Sanitation Problem in San Diego, California/Tijuana, Baja California.
IBWC Minute No. 283 states the following: “Should Mexico request [help]
through the Commission, the United States Section will attempt to assist with
equipment and other resources in the containment of [discharges of treated or
untreated domestic or industrial wastewaters into waters of the Tijuana River
that cross the international boundary] and temporary repairs under the
supervision of the Commission.” Mexico has the primary responsibility for
preventing the discharge of wastewater to receiving waters in the Tijuana River
Valley; but, per IBWC Minute No. 283, the U.S. also has a role assisting with
equipment, maintenance, and resources in the containment of wastewater
discharges through utilization of the canyon collectors, which collect and divert
untreated sewage and other dry weather transboundary flows to the Facility for
treatment. These flows have great potential to cause or contribute to
degradation of water quality in the receiving water and, therefore, must be
contained.
As defined by section 212 of the CWA, a treatment works includes any devices
and systems used in the storage, treatment, recycling and reclamation of
municipal sewage or industrial wastes of a liquid nature. Treatment works also
includes any other method or system for preventing, abating, reducing, storing,
treating, separating, or disposing of municipal waste, including storm water
runoff, or industrial waste, including waste in combined storm water and sanitary
sewer systems. Consistent with this definition, the canyon collectors are
considered part of the treatment works of the Facility regulated by this Order.
The CWA largely prohibits any discharge of pollutants from point sources to
waters of the United States except as authorized under an NPDES permit. In
general, any point source discharge of sewage effluent to waters of the United
States must comply with technology-based, secondary treatment standards, at a
minimum, and any more stringent requirements necessary to meet applicable
water quality standards and other requirements. The unpermitted discharge of
wastewater to waters of the United States is unlawful.
The Basin Plan prohibits discharges of waste to land, except as authorized by
WDR’s or the terms prescribed in Water Code section 13264. The Basin Plan
also prohibits the unauthorized discharge of treated or untreated sewage to
waters of the State or to a storm water conveyance system.
Discharge Prohibition III.A of the Order prohibits the discharge of waste from the
Facilities to a location other than Discharge Point No. 001, unless specifically
regulated by this Order or separate WDR’s. This prohibition also applies to any
dry weather discharge of waste overflowing the canyon collectors.

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U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

This Order requires the Prevention/Response Plan to mandate that the
Discharger operate and maintain the canyon collectors as part of the treatment
works and in a manner consistent with the IBWC Minutes between Mexico and
the U.S., to prevent violations of the CWA, Basin Plan, and Prohibition III.A of
this Order.
b.

Spill and Transboundary Wastewater Flow Reporting Requirements
To determine compliance with Discharge Prohibition III.A and provide appropriate
notification to the governmental agencies and general public for the protection of
public health and the environment, spill and transboundary wastewater flow
reporting requirements have been established in section VI.C.2.d of this Order.

c.

Toxicity Reduction Evaluation (TRE)
Implementing provisions at section III.C.4.c.(4) of the Ocean Plan require chronic
toxicity monitoring for ocean waste discharges with minimum initial dilution factors
less than 100:1 for the protection of beneficial uses of ocean waters. Based on
methods of the Ocean Plan, an acute effluent limitation of 3.2 TUa and a chronic
toxicity effluent limitation of 95.6 TUc are established in this Order. The weekly
monitoring for acute and chronic toxicity from Order No. 96-50 has been carried
over to this Order.
Section III.C.10. of the Ocean Plan requires a Toxicity Reduction Evaluation (TRE) if
a discharge consistently exceeds an effluent limitation based on a toxicity objective
in Table 1 of the Ocean Plan.
In compliance with the Ocean Plan, this Order requires the Discharger to develop a
TRE workplan, submit the TRE workplan within 180 days of the effective date of this
Order, and share the TRE workplan with CILA. The workplan must describe steps
the Discharger intends to follow if the effluent limitation for acute toxicity (3.2 TUa) is
exceeded or if the effluent limitation for chronic toxicity (95.6 TUc) is exceeded.
If the effluent limitation for acute or chronic toxicity is exceeded in any one test, the
Discharger must conduct a TRE if the toxicity is exceeded in any of the next six (6)
succeeding tests performed at 14-day intervals and notify the San Diego Water
Board. The requirement for a minimum of six (6) succeeding tests performed at 14day intervals is based on the probability of encountering at least one toxicity
exceedance assuming a true, but unknown level of occurrence. After the acute or
chronic toxicity exceedance, the Discharger must continue to conduct the routine
weekly monitoring for both acute and chronic toxicity as required in Attachment E of
this Order. The TRE shall be conducted in accordance with the approved TRE
workplan and available USEPA guidance documents2. The Discharger must also
implement a Toxicity Identification Evaluation (TIE), as necessary, based upon the
magnitude and persistence of toxicity effluent limitation exceedances. Once the
source of toxicity is identified, the Discharger must take all reasonable steps to

2

See (a) TRE Guidance for Municipal Wastewater Treatment Plants (EPA 833-B-99-002, 1999); (b) Generalized
Methodology for Conducting Industrial Toxicity Reduction Evaluations (EPA/600/2-88/070); Toxicity
Identification Evaluation, Phase I (EPA/600/6-91/005F); (c) Methods for Aquatic Toxicity Identification
Evaluations, Phase II (EPA/600/R-92/080); (d) Methods for Aquatic Toxicity Identification Evaluations, Phase
III (EPA/600/R-92/081); and (e) Marine Toxicity Identification Evaluation (TIE): Phase I Guidance Document
(EPA/600/R-96-054,1996)

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U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

reduce the toxicity to meet the acute and/or chronic toxicity effluent limitation
identified in section IV.A of this Order, including working with the Government of
Mexico as described further in section VI.C.2.e.
Within 30 days of completion of the TRE, the Discharger must submit the results of
the TRE, including a summary of the findings, data generated, a list of corrective
actions taken or planned to achieve consistent compliance with all the toxicity
limitations of this Order and prevent recurrence of exceedances of those limitations,
and a time schedule for implementation of any planned corrective actions. The
Discharger must implement any planned corrective actions assigned to the
Discharger in the TRE Final Report in accordance with the specified time schedule,
unless otherwise directed in writing by the San Diego Water Board. The corrective
actions and time schedule must be modified at the direction of the San Diego Water
Board.
3.

Best Management Practices and Pollution Prevention – Not Applicable

4.

Construction, Operation, and Maintenance Specifications – Not Applicable

5.

Special Provisions for Municipal Facilities (Wastewater Facilities Only)
a.

Influent Limitations and Pretreatment
IBWC Minute No. 283 states "[t]he Government of Mexico in accordance with laws
in force in that country, in order to assure efficient treatment of Tijuana sewage in
the international plant, will require all industries to provide appropriate pretreatment
of wastewater that those industries may discharge into the Tijuana sewage
collection system which would in turn discharge into the international sewage
treatment plant."
Requirement G. 1 of Order No. 96-50 states "[i]n consultation with the Government
of Mexico, the discharger shall develop and implement mass emission rate and
concentration limitations for the influent to the Facility (influent limitations) for
pollutants that may cause or contribute to interference, pass through or other
problems described at 40 CFR section 403.5. The influent limits shall prevent
violations of the Ocean Plan and this Order."
Requirement G.4 of Order No. 96-50 requires the Discharger to submit a project
report to include influent limitations, the basis for the influent limitations, a
comparison of the influent limitations with the Facility influent and with any Mexican
wastewater quality standards, a sensitivity analysis, and an achievability analysis by
June 18, 1997.
On June 4, 1997, the San Diego Water Board received a report titled “Development
of Headworks Allocations for the South Bay International Wastewater Treatment
Plant - Final Report”. The Final Report identified 16 primary pollutants of concern,
including arsenic, beryllium, cadmium, chromium, copper, cyanide, lead, mercury,
nickel, silver, zinc, total HCH (Lindane), Aldrin, DDTs, PAHs, and carbon disulfide.
On September 17, 1997, the San Diego Water Board adopted Addendum No. 1 to
Order No. 96-50 which established advanced primary treatment influent limitations
for 12 of the 16 primary pollutants of concern which were identified in the June 1997
Final Report (including arsenic, beryllium, cadmium, chromium, copper, cyanide,

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U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

lead, mercury, nickel, silver, zinc, total HCH (Lindane)). Influent limitations could not
be developed for Aldrin, DDTs, PAHs, and carbon disulfide, but these parameters
were monitored according to Monitoring and Reporting Program No. 96-50.
Influent limitations are necessary to prevent the introduction of pollutants into the
Facility that a) inhibit or disrupt the Facility, its treatment processes or operations, or
its sludge processes, use or disposal; b) pass through the Facility in quantities or
concentrations that cause or contribute to an exceedance of an applicable water
quality standard in the receiving water or otherwise be incompatible with the
treatment works; or c) cause other problems as described at 40 CFR section 403.5.
Influent limitations are based on the specific treatment and operational capacity of
the Facility and are therefore essential to ensure that all aspects of the treatment
works are protected from pass through or interference in accordance with the Clean
Water Act and NPDES pretreatment regulations at 40 CFR part 403. Influent
limitations impose conditions on the quality of influent discharged into the sewage
treatment plant located in the United States. They do not establish water quality or
discharge requirements that must be attained in Mexico.
The influent limitations in this Order have been carried over from Order No. 96-50.
Section VI.C.5.a.i of this Order requires the Discharger to develop and implement
updated influent limitations no later than one year after the adoption of this Order,
for approval and incorporation into this Order. In consultation with the San Diego
Water Board and the government of Mexico, the Discharger must review and update
influent limitations, as necessary, to take into account (1) the Facility’s recent
treatment upgrade from advanced primary treatment capabilities to secondary
treatment capabilities; and (2) any changes that may have occurred in the make-up
or quantity of industrial users contributing loadings to the Facility via the City of
Tijuana’s wastewater conveyance system.
This Order contains provisions to address exceedances of influent limitations,
including a requirement to formally communicate with Mexico about the quality of
the influent to the Facility and any issues regarding the influent quality. These
requirements are consistent with and further efforts to attain the goals of IBWC
Minute No. 283 to prevent pollutants from entering the Facility that may cause or
contribute to interference, pass through or other problems described at 40 CFR
section 403.5 and to prevent violations of effluent limitations.
b.

Sludge (Biosolids) Requirements
The use and disposal of biosolids within the United States is regulated under federal
and State laws and regulations, including permitting requirements and technical
standards included in 40 CFR part 503. The Discharger is required to comply with
the standards and time schedules contained in 40 CFR part 503 for biosolids used
or disposed of within the United States.
Title 27, CCR, division 2, subdivision 1, section 20005 establishes approved
methods for the disposal of collected screenings, residual sludge, biosolids, and
other solids removed from liquid wastes. Requirements to ensure the Discharger
disposes of solids in compliance with State and federal regulations have been
included in this Order.

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U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

In its NPDES application, the Discharger indicates that all biosolids produced at the
Facility are trucked to Mexico for disposal. The use and disposal of any biosolids
occurring within the United States shall be regulated under this Order.
Monitoring and reporting requirements have been included in this Order in the event
of a sludge spill, to ensure proper handling and storage of sludge, and to certify the
disposal of the sludge in Mexico.
In the event that the Government of Mexico is unable to truck the processed sludge
and solids to Mexico for disposal, this Order requires the Discharger to develop a
Sludge and Solids Contingency Plan to temporarily store or dispose of the
processed sludge and solids in the United States.
c.

Requirements for Receipt of Anaerobically Digestible Material
This provision implements an agreement between State Water Board; California
Department of Resources Recycling and Recovery; the California Department of
Food and Agriculture; and the California Association of Sanitation Agencies
regarding the regulation of hauled-in anaerobically digestible material for injection
into an anaerobic digester. With the addition of a standard provision in NPDES
permits that requires the treatment works to develop and implement standard
operating procedures from anaerobically digestible material acceptance and
digestion operations, CalRecycle would exempt the operation from regulation under
its requirements.

6.

Other Special Provisions

7.

Compliance Schedules – Not Applicable

VII. RATIONALE FOR MONITORING AND REPORTING REQUIREMENTS
Section 122.48 of 40 CFR requires that all NPDES permits specify requirements for recording and
reporting monitoring results. Water Code sections 13267 and 13383 authorize the San Diego
Water Board to require technical and monitoring reports. The Monitoring and Reporting Program
(MRP), Attachment E, establishes monitoring and reporting requirements that implement federal
and state requirements. The following provides the rationale for the monitoring and reporting
requirements contained in the MRP for this facility.
A.

Core Monitoring Requirements
1.

Influent Monitoring Requirements
Influent monitoring is required to determine the compliance with influent limitations, to
assist with pretreatment investigations in Mexico, to evaluate compliance with effluent
limitations, and to assess the performance of treatment facilities.
The influent monitoring for CBOD5, TSS, volatile suspended solids, and temperature has
been increased from weekly to daily to match the effluent monitoring and thus to better
evaluate compliance with effluent limitations and assess the performance of the new
treatment facilities. Biochemical oxygen demand (5-day @ 20°C) (BOD5) has been
added with a sampling frequency to match the effluent monitoring for the same reason.
The influent monitoring frequency for the other conventional pollutants ( total dissolved
solids, floating particulates, grease and oil, settleable solids, turbidity, and pH) have been
carried over from Order No. 96-50. The influent monitoring frequency for parameters for
protection of marine aquatic life has been reduced from weekly to monthly, with the

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U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

exception of Table B metals and radioactivity. Weekly monitoring for table B metals has
been carried over from Order No. 96-50. Radioactivity was already monthly in Order No.
96-50. The influent monitoring frequency for parameters for human health has been
reduced from weekly/monthly to quarterly.
The monitoring frequency for the influent set forth in this Order is sufficient to evaluate
the highly variable wastewater from Tijuana, Mexico. If, however, any result for this
parameter exceeds the applicable interim or final influent limitation specified in this
Order, as appropriate, the minimum frequency shall be increased from 1/Week to
5/Week, 1/Month to 1/Week, or 1/Quarter to 1/Month, as appropriate. The increase
monitoring along with consultation with Mexico may help determine the cause.
Refer to section III.A of Attachment E of this Order for a summary of influent monitoring
requirements.
2.

Effluent Monitoring Requirements
Effluent monitoring is required to determine compliance with the permit conditions, to
identify operational problems, to improve plant performance, and to conduct reasonable
potential analyses for subsequent Orders. Effluent monitoring also provides information
on wastewater characteristics for use in interpreting water quality and biological data.
Effluent monitoring for soluble BOD has been removed since monitoring of BOD and
CBOD5 is sufficient for evaluating the secondary-treated effluent.
The sampling frequencies for the other conventional pollutants (CBOD5, BOD5, volatile
suspended solids, total dissolved solids, temperature, floating particulates, total
suspended solids, settleable solids, turbidity, and pH) have been carried over from Order
No. 96-50, with the exception of grease and oil, which has been reduced from daily to
weekly. Weekly sampling frequency for oil and grease is more common for secondarytreated effluent and the oil and grease has not been detected in the effluent from August
2012 to October 2013.
The effluent monitoring frequency for parameters for protection of marine aquatic life has
been reduced from weekly to monthly, with the exception Table B metals, radioactivity
and total chlorine residual. Monthly monitoring for radioactivity has been carried over
from Order No. 96-50. The Facility currently monitors total chlorine residual on a daily
basis. Daily monitoring for total chlorine residual has been included in this Order. Weekly
monitoring for table B metals has been carried over from Order No. 96-50. Radioactivity
was already monthly in Order No. 96-50. The effluent monitoring frequency for
parameters for human health has been reduced from weekly/monthly to quarterly.
The Ocean Plan requires discharges greater than 10 MGD to monitor at least
semiannually for Table 1 parameters. The monitoring frequency for the effluent set forth
in this Order is greater than the Ocean Plan requirement to account for the highly
variable wastewater from Tijuana, Mexico, but is reasonable for secondary-treated
effluent.
For this Order, as amended by Order No. R9-2017-0024, the Discharger may apply the
performance goal for both chromium (VI) and chromium (III) as a total chromium
performance goal. The Ocean Plan allows dischargers to meet the objective for
chromium (VI) as a total chromium objective (footnote a of Table 1 of the Ocean Plan).
Total chromium includes both chromium (VI) and chromium (III) and the Clean Water Act

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U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

has no analytical method for chromium (III)3. Thus, this Order allows the Discharger to
also meet the objective for chromium (III) as a total chromium objective. If the Discharger
monitors for total chromium to meet the objective for both chromium (VI) and chromium
(III), the total chromium data will be used to determine if reasonable potential exists for
both chromium (VI) and chromium (III) in future permit reissuances and/or updates.
Refer to section III.B of Attachment E of this Order for a summary of effluent monitoring
requirements.
3.

Whole Effluent Toxicity Testing Requirements
This order contains both acute and chronic toxicity effluent limitation as described in
section IV.C.3. Toxicity monitoring has been carried over from Order No. 96-50 to
determine compliance with these toxicity effluent limitations.

4.
5.
B.

Land Discharge Monitoring Requirements – Not Applicable
Recycling Monitoring Requirements – Not Applicable

Receiving Water Monitoring Requirements
The receiving water and sediment monitoring requirements set forth below are designed to
measure the effects of the SBOO discharge on the receiving ocean waters. These monitoring
requirements will remain in effect on an interim basis, pending development of a new and
updated monitoring and assessment programs. The overall receiving water monitoring
program is intended to answer the following questions:
(1) Does the receiving water meet water quality standards?
(2) Are the receiving water conditions getting better or worse over time?
(3) What is the relative contribution of the Facility discharge to pollution in the receiving
water?
1.

Shoreline Water Quality Monitoring Requirements
As ocean surface waves come closer to shore they break, forming the foamy, bubbly
surface called surf. The region of breaking waves defines the shoreline.
Monitoring of the shoreline is intended to answer the following questions:
(1) Does the effluent cause or contribute to an exceedance of the water quality
standards in the receiving water?
(2) Does the effluent reach water contact zones or commercial shellfish beds?
(3) Are densities of bacteria in water contact areas below levels protective of
public health?
Shoreline Station S-1 (located in Mexico near Punta Bandera) was abandoned after
August 6, 2002 as a result of legal restrictions that prevented access to this station
beginning in July 2002. Consequently, shoreline Station S-0 was established to replace
S-1 as the southernmost shoreline sampling site for SBOO. Sampling began at S-0 on
August 13, 2002. This change was documented in the August 2002 monthly selfmonitoring report.

3

In order to obtain a value for chromium (III), two separate methods must be used: one for total chromium
determination and one for chromium (VI) determination. The value for chromium (III) is obtained by
subtracting the chromium (VI) value from the total chromium value.

ATTACHMENT F – FACT SHEET

F-42

179

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Refer to section IV.A of Attachment E of this Order for a summary of shoreline water
quality monitoring requirements.
2.

Offshore Water Quality Monitoring Requirements
Offshore monitoring extends from south of international border to Point Loma. See
Attachment B for a map of the offshore monitoring stations.
Offshore monitoring is necessary to answer the following questions:
(1) Is natural light significantly reduced at any point outside the zone of initial
dilution as a result of the discharge?
(2) Does the discharge cause a discoloration of the ocean surface?
(3) Does the discharge of oxygen demanding waste cause the dissolved
oxygen concentration to be depressed at any time more than 10 percent
from that which occurs naturally?
(4) Does the discharge of waste cause the pH to change at any time more than
0.2 units from that which occurs naturally?
(5) Is the wastewater plume encroaching upon receiving water areas used for
swimming, surfing, diving and shellfish harvesting?
(6) What is the fate of the discharge plume?
As commissioned by the USIBWC, staff at the University of California San Diego,
Scripps Institution of Oceanography conducted a study to determine the characteristic
fates of the wastewater plume from the SBOO. The results of the study were
summarized in the Final Report Coastal Observations Monitoring in South Bay San
Diego, dated February 25, 2009 (Plume Study). Recommendations from the Plume
Study have been included in this Order.
Refer to section IV.B of Attachment E of this Order for a summary of off shore water
quality monitoring requirements.

3.

Benthic Community Protection Monitoring Requirements
Sediments integrate constituents that are discharged to the ocean. Most particles that
come from the SBOO discharge, and any associated contaminants, will eventually settle
to the seafloor where they are incorporated into the existing sediments. Sediments can
accumulate these particles over the years until the point where sediment quality has
degraded and beneficial uses are impaired.
The MRP requires periodic assessment of sediment quality to evaluate potential effects
of the SBOO discharge and compliance with narrative water quality standards specified
in the Ocean Plan. The required assessment consists of the measurement and
integration of three lines of evidence: 1) physical and chemical properties of seafloor
sediments, 2) seafloor sediment toxicity to assess bioavailability and toxicity of sediment
contaminants and 3) ecological status of the biological communities (benthos) that live in
or on the seafloor sediments.
The benthic community is strongly affected by sediment composition (e.g., sand, silt, and
clay distributions), sediment quality (e.g., chemistry, toxicity), and water quality. Because
benthic macroinvertebrates (e.g., infauna) are dependent on their surroundings, they
often serve as important biological indicators that reflect the overall conditions of the
marine environment.

ATTACHMENT F – FACT SHEET

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U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Sediment and benthic community monitoring are necessary to answer the following
question:
(1) Is the dissolved sulfide concentration of waters in sediments significantly
increased above that present under natural conditions?
(2) Is the concentration of substances, set forth in Table 1 of the Ocean Plan
for protection of marine aquatic life, in marine sediments at levels which
would degrade the benthic community?
(1) Is the concentration of organic pollutants in marine sediments at levels that
would degrade the benthic community?
(2) Are benthic communities degraded as a result of the discharge?
(3) Is the sediment quality changing over time?
Refer to section IV.C of Attachment E of this Order for a summary of sediment and
benthic monitoring requirements.
4.

Fish and Invertebrate Monitoring Requirements
Many pollutants discharged into receiving waters have the potential to bioaccumulate
and persist in tissue of aquatic organisms, including fish. Chemical pollutants that
bioaccumulate tend to magnify in concentration as they pass through the aquatic food
chain. Fish monitoring data is required to assess the human health risks for individuals
who may consume fish and to assess trends of contaminants levels in the receiving
water over time.
Marine aquatic invertebrates are excellent indicators of ecosystem health because they
are ubiquitous, abundant, diverse, and typically sedentary. The growth, survival, and
reproduction of aquatic invertebrates are all sensitive to declines in environmental health,
making analysis of assemblage structure a good ecosystem monitoring tool.
Fish and invertebrate monitoring is necessary to answer the following questions:
(1) Does the concentration of pollutants in fish, shellfish, or other marine
organisms used for human consumption bioaccumulate to levels that are
harmful to human health?
(2) Does the concentration of pollutants in marine life bioaccumulate to levels
that degrade marine communities?
(3) Are the concentrations of pollutants in fish and other marine organisms
changing over time?
(4) Is the health of fish changing over time?
(5) Is the population of selected species changing over time?
Refer to section IV.D of Attachment E of this Order for a summary of fish monitoring
requirements.

5.

Receiving Water Monitoring Reports
In a letter dated November 5, 2015, the City of San Diego requested modifications to the
reporting requirements for the receiving water monitoring for the Point Loma Ocean
Outfall (PLOO) and SBOO. Order No. R9-2009-0001 for the PLOO discharge from the
E.W. Blom Point Loma Wastewater Treatment Plant and Order No. R9-2013-0006 as
amended by Order No. R9-2014-0071 for SBOO discharge from the South Bay Water

ATTACHMENT F – FACT SHEET

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181

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Reclamation Plant4 required the City of San Diego to submit annual full assessment
reports, one annual report for PLOO and one annual report for SBOO. The City of San
Diego also prepared a separate annual full assessment report for the Facility discharge
to the SBOO as required by Order No. R9-2014-0009 as amended by Order No. R92014-0094. The recently adopted new MRP for the PLOO (Order No. R9-2017-0007)5
authorizes the City of San Diego to replace the above three annual reports with Interim
Receiving Water Monitoring Reports (Interim Reports, executive summary) and Biennial
Receiving Water Monitoring Reports (Biennial Reports, full assessment) submitted in
alternating years. The Interim Reports will cover a single monitoring calendar year (e.g.,
2018, 2020), will only cover even numbered years, and shall be submitted every other
year. The Biennial Receiving Water Monitoring Reports will provide a more thorough
discussion, evaluation (e.g., detailed statistical analyses), and interpretation than the
Interim Receiving Water Monitoring Reports; will cover two years of receiving water
monitoring (e.g., biennial reports for calendar years 2016-2017, 2018-2019, and 20202021), and shall be submitted in the opposite years as the Interim Receiving Water
Monitoring Reports. Under this approach, every two years, one integrated Interim Report
and one integrated Biennial Report covering the receiving water monitoring requirements
for both the SBOO and PLOO may be submitted to comply with NPDES Permit reporting
requirements. The Discharger must collaborate with the City of San Diego in the
submittal of the Interim Reports and the Biennial Reports required under this Order. The
Discharger shall also collaborate with the City of San Diego in providing a Biennial State
of the Ocean Report (an oral report) to the San Diego Water Board following each
submittal of the Biennial Report. The oral report should focus on the effort completed
during the past two years of monitoring, the status of the receiving waters, and plans for
future monitoring efforts. If the oral report is not feasible (e.g., board meetings are
cancelled or have too many items), a written Biennial State of the Ocean Report may be
provided in lieu of an oral report.
Refer to section IV.E of Attachment E of this Order for a summary of fish monitoring
requirements.
6.
C.

Groundwater – Not Applicable

Regional Monitoring Requirements
Regional ocean water monitoring provides information about the sources, fates, and effects of
anthropogenic contaminants in the coastal marine environment necessary to make
assessments over large areas. The large scale assessments provided by regional monitoring
describe and evaluate cumulative effects of all anthropogenic inputs and enable better
decision making regarding protection of beneficial uses of ocean waters. Regional monitoring
data assists in the interpretation of core monitoring studies by providing a more accurate and
complete characterization of reference conditions and natural variability. Regional monitoring
also leads to methods standardization and improved quality control through intercalibration
exercise. The coalitions implementing regional monitoring enable sharing of technical

4

Order No. R9-2013-0006 as amended by Order Nos. R9-2014-0071 and R9-2017-0023, NPDES Permit No.
CA0109045, Waste Discharge Requirements for the City of San Diego South Bay Water Reclamation Plant
Discharge to the Pacific Ocean via the South Bay Ocean Outfall, Monitoring and Reporting Program
(Attachment E)
5
Order No. R9-2017-0007, NPDES Permit No. CA0107409, Waste Discharge Requirements and National
Pollutant Discharge Elimination System Permit for the City of San Diego E.W. Blom Point Loma Wastewater
Treatment Plant Discharge to the Pacific Ocean Through the Point Loma Ocean Outfall, Monitoring and
Reporting Program (Attachment E)
ATTACHMENT F – FACT SHEET

F-45

182

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

resources, trained personnel and associated costs. Focusing these resources on regional
issues and developing a broader understanding of pollutants effects in ocean waters enables
the development of more rapid and effective response strategies. Based on all of these
considerations the San Diego Water Board supports regional approaches to monitoring ocean
waters.
The Discharger shall, as directed by the San Diego Water Board, participate with other
regulated entities, other interested parties, and the San Diego Water Board in development
and implementation of new and improved monitoring and assessment programs for ocean
waters in the San Diego Region and discharges to those waters. These programs shall be
developed and implemented so as to:
(1) Determine the status and trends of conditions in ocean waters in the San Diego
Region with regard to beneficial uses, e.g.,
i.

Are fish and shellfish safe to eat?

ii. Is water quality safe for swimming?
iii. Are ecosystems healthy?
(2) Identify the primary stressors causing or contributing to conditions of concern;
(3) Identify the major sources of the stressors causing or contributing to conditions of
concern; and
(4) Evaluate the effectiveness (i.e., environmental outcomes) of actions taken to address
such stressors and sources.
1.

Kelp Bed Canopy Monitoring Requirements
Kelp consists of a number of species of brown algae. Along the central and southern
California coast, giant kelp (Macrocystis pyrifera) is the largest species colonizing rocky,
and in some cases sandy, subtidal habitats. Giant kelp is an important component of
coastal and island communities in southern California, providing food and habitat for
numerous animals. Monitoring of the kelp beds is necessary to answer the following
questions:
(1) What is the maximum areal extent of the coastal kelp bed canopies each year?
(2) What is the variability of the coastal kelp bed canopy over time?
(3) Are coastal kelp beds disappearing? If yes, what are factors that could contribute to
the disappearance?
(4) Are new coastal kelp beds forming?
Refer to section V.A of Attachment E of this Order for a summary of kelp bed canopy
monitoring requirements.

2.

Southern California Bight Monitoring Program Participation Requirements
The Discharger is required to participate in the Southern California Coastal Water
Research Project (SCCWRP), Southern California Bight Regional Monitoring Program),
or any other coordinator named by the Executive Officer, pursuant to CWC 13267,
13383, and 40 CFR 122.48. The intent of the Southern California Bight Regional
Monitoring Program is to maximize the efforts of all monitoring partners using a more

ATTACHMENT F – FACT SHEET

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U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

cost-effective monitoring design and to best utilize the pooled scientific resources of the
Southern California Bight.
During these coordinated sampling efforts, the Discharger’s receiving water sampling
and analytical effort, as defined in section IV of the MRP, may be reallocated to provide a
regional assessment of the impact of the discharge of municipal wastewater to the
Southern California Bight. In that event, the receiving water sampling and analytical effort
defined in section IV of the MRP will not be required for the duration of the reallocation.
Anticipated modifications to the monitoring program will be coordinated so as to provide
a more comprehensive picture of the ecological and statistical significance of monitoring
results and to determine cumulative impacts of various pollution sources. The level of
resources in terms of sampling and analytical effort redirected from the receiving water
monitoring program required under section IV the MRP shall equal the level of resources
provided to implement the regional monitoring and assessment program, unless the
Executive Officer, the Discharger and City of San Diego agree otherwise. The specific
scope and duration of the receiving water monitoring program reallocation and
redirection shall be determined and set by the Executive Officer in consultation with the
Discharger and City of San Diego.
D.

Special Studies Requirements
Compliance with Bacteriological Standards
By letter dated January 10, 2013, the City of San Diego provided a tabulation and
interpretation of the SBOO receiving water monitoring data for the past 17 years. From
1999 to 2010, the Discharger (USIBWC) discharged advanced primary treated
wastewater from the Facility into the Pacific Ocean through the SBOO. During this same
time period, sample results at the three offshore receiving water stations closest to the
SBOO ranged from 72 to 94 percent in compliance with bacterial water quality objectives
and samples at all the offshore receiving water stations for SBOO ranged from 90 to 95
percent in compliance with bacterial water quality objectives. After USIBWC commenced
discharging secondary treated effluent from the Facility to meet secondary treatment
requirements in January, 2011, sample results at the three offshore stations closest to
the SBOO were 99 percent in compliance and sample results at all the offshore stations
for SBOO were also 99 percent in compliance.
A new analysis of the receiving water bacterial data is necessary to demonstrate if the
SBOO discharge is attaining full compliance with bacteriological receiving water
limitations described in section V.A.1 of this Order at all times. The data set used for this
analysis must be sufficient to provide statistically defensible conclusions and shall
include all receiving water bacterial data collected after July 31, 2012 when the Facility
discharge attained substantial compliance with secondary treatment standards through
December 31, 2015. Primary questions to be addressed include the following:
(1) Does the Facility effluent cause or contribute to an exceedance of
bacteriological receiving water limitations described in section V.A.1 of this
Order in ocean waters outside the zone of initial dilution?
(2) What is the extent and magnitude of any identified exceedance of
bacteriological receiving water limitations described in section V.A.1 of this
Order?
(3) Do any identified exceedances impact any marine water contact recreation
zones?

ATTACHMENT F – FACT SHEET

F-47

184

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

(4) If noncompliance with bacteriological receiving water limitations is identified,
and if the noncompliance has not been corrected, what is the anticipated
time it is expected to continue; and what are the steps taken or planned to
reduce, eliminate, and prevent reoccurrence of the noncompliance?
E.

Other Monitoring Requirements
Transboundary Wastewater Flows
Consistent with Water Code sections 13267 and 13383, this Order requires monitoring
and reporting to evaluate international border sanitation problems and impacts to the
beneficial uses of the Tijuana watershed and the coastal waters where the San Diego
Water Board has legal authority to do so. In this Order, the San Diego Water Board has
the legal authority to require the Discharger to monitor and assess dry-weather
transboundary wastewater flows in Goat Canyon, Smugglers Gulch, Silva Drain, Canyon
del Sol, and Stewart’s Drain that pass the Discharger’s canyon collector systems. The
provision of the 1944 Water Treaty, article 3, expresses commitments by the
governments of the United States and Mexico to give preferential attention to the solution
of all international border sanitation problems. In addition, the 1944 Water Treaty article
2, 3, and 24, give the Discharger the authority to meet this obligation. Pollutant
parameters required to be monitored were selected on the basis of their threat to impact
REC-1 and other beneficial uses, the 303(d) list for waters in the vicinity of the Tijuana
Watershed, and the probability that they may be present in the transboundary flows. This
Order also requires the Discharger to provide appropriate notification of transboundary
flows to the San Diego Water Board, other local, state, and federal authorities, and the
general public for the protection of public health and the environment in the border
region.
The term transboundary wastewater flow is used in this Order to refer to a variety of
flows containing pollutants from Tijuana, Mexico that have historically flowed into the
United States via the north-draining canyons and ravines identified in this Order as Goat
Canyon, Smugglers Gulch, Silva Drain, Canyon del Sol, and Stewart’s Drain, that empty
into the Tijuana River Valley and Estuary. These wastewater flows from Tijuana are
attributed to a variety of sources and causes including, but not limited to, treated
wastewater effluent discharges, potable water leaks, sewer line leaks and spills,
discharges from unsewered areas, and other failures and breakdowns of the wastewater
collection infrastructure in Mexico. The transboundary wastewater flows consist of
treated and untreated sewage and industrial wastewater, potable water, and other
miscellaneous flows depending on the source of the flow. These transboundary
wastewater flows have adversely impacted the Tijuana River Valley and Estuary as well
as adjacent coastal marine waters and beaches.
Monitoring of dry-weather transboundary wastewater flows that pass any one of the five
Discharger’s canyon collector systems is necessary to answer the following questions:
(1) What is the frequency and volume of dry weather transboundary
wastewater flows?
(2) What are the sources of dry weather transboundary wastewater flows?
(3) What pollutants are present in dry weather transboundary wastewater flows
and what is their concentration?
(4) Do pollutants in dry weather transboundary wastewater flows affect
beneficial uses of the Tijuana River and Estuary?

ATTACHMENT F – FACT SHEET

F-48

185

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

(5) What is the mass loading of pollutants on the Tijuana River and Estuary
from dry weather transboundary wastewater flows over time?
(6) Are the canyon collector systems being properly operated and maintained
to ensure compliance with the conditions of the Order?
VIII. PUBLIC PARTICIPATION
The San Diego Water Board has considered the issuance of WDR’s that will serve as an NPDES
permit for the South Bay International Wastewater Treatment Plant. As a step in the WDR
adoption process, the San Diego Water Board staff developed tentative WDR’s and has
encouraged public participation in the WDR adoption process and provided an opportunity for
public review and comment on the tentative WDRs in accordance with title 40 CFR section 124.10
and Water Code section 13167.5.
A.

Notification of Interested Parties
The San Diego Water Board notified the Discharger and interested agencies and persons of
its intent to prescribe WDR’s for the discharge and provided an opportunity to submit written
comments and recommendations. Notification was provided through the San Diego Union
Tribune and San Diego Water Board’s web site.
The public had access to the agenda and any changes in dates and locations through the
San Diego Water Board’s web site at:
http://www.waterboards.ca.gov/sandiego/

B.

Written Comments
Interested persons were invited to submit written comments concerning tentative WDR’s as
provided through the notification process. Comments were due either in person or by mail to
the Executive Office at the San Diego Water Board at 2375 Northside Drive, Suite 100, San
Diego, CA 92108.
To be fully responded to by staff and considered by the San Diego Water Board, the written
comments were due at the San Diego Water Board office by 12:00 noon on May 27, 2014.

C.

Public Hearing
The San Diego Water Board held a public hearing on the tentative WDR’s during its regular
Board meeting on the following date and time and at the following location:
Date:
Time:
Location:

Wednesday, June 26, 2014
9:00 AM
Regional Water Quality Control Board
Regional Board Meeting Room
2375 Northside Drive, Suite 100
San Diego, CA 92108

Interested persons were invited to attend. At the public hearing, the San Diego Water Board
heard testimony, pertinent to the discharge, WDR’s, and permit. For accuracy of the record,
important testimony was requested in writing.
D.

Appeal of Waste Discharge Requirements
Any person aggrieved by this action of the San Diego Water Board may petition the State
Water Board to review the action in accordance with CWC section 13320 and California Code
of Regulations, title 23, sections 2050. The State Water Board must receive the petition by

ATTACHMENT F – FACT SHEET

F-49

186

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

5:00 p.m. 30 days after the San Diego Water Board’s action at the following address:State
Water Resources Control Board
Office of Chief Counsel
P.O. Box 100, 1001 I Street
Sacramento, CA 95812-0100
Copies of the law and regulations applicable to filing petitions may be found on the lnternet at: ·
http://www.waterboards.ca.gov/public_notices/petitions/water_quality or will be provided upon
request.
E.

Information and Copying
The Report of Waste Discharge, other supporting documents, and comments received are on
file and may be inspected at the address above at any time between 8:30 a.m. and 4:45 p.m.,
Monday through Friday. Copying of documents may be arranged through the San Diego
Water Board by calling 619-516-1990.

F.

Register of Interested Persons
Any person interested in being placed on the mailing list for information regarding the WDR’s
and NPDES permit should contact the San Diego Water Board, reference this facility, and
provide a name, address, and phone number or should sign up for the email subscription list
for the “South Bay International Wastewater Treatment Plant – NPDES” at
http://www.waterboards.ca.gov/resources/email_subscriptions/reg9_subscribe.shtml.

G.

Additional Information
Requests for additional information or questions regarding this order should be directed to
Joann Lim at 619-521-3362.

ATTACHMENT F – FACT SHEET

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187

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

G.
ATTACHMENT G – OCEAN PLAN AND BASIN PLAN PROHIBITIONS
Ocean Plan Discharge Prohibitions

I.

1. The Discharge of any radiological chemical, or biological warfare agent or high-level radioactive
waste into the ocean is prohibited.
2. Waste shall not be discharged to designated Areas of Special Biological Significance except as
provided in chapter III.E of the Ocean Plan.
3. Pipeline discharge of sludge to the ocean is prohibited by federal law; the discharge of
municipal and industrial waste sludge directly to the ocean, or into a waste stream that
discharges to the ocean, is prohibited. The discharge of sludge digester supernatant directly to
the ocean, or to a waste stream that discharges to the ocean without further treatment, is
prohibited.
4. The by-passing of untreated wastes containing concentrations of pollutants in excess of those of
Table 2 or Table 1 of the Ocean Plan is prohibited.
Basin Plan Discharge Prohibitions1

II.

1. The discharge of waste to waters of the State in a manner causing, or threatening to cause a
condition of pollution, contamination or nuisance as defined in Water Code section 13050, is
prohibited.
2. The discharge of waste to land, except as authorized by WDR’s or the terms described in Water
Code section 13264 is prohibited.
3. The discharge of pollutants or dredged or fill material to waters of the United States except as
authorized by an NPDES permit or a dredged or fill material permit (subject to the exemption
described in Water Code section 13376) is prohibited.
4. Discharges of recycled water to lakes or reservoirs used for municipal water supply or to inland
surface water tributaries thereto are prohibited, unless this San Diego Water Board issues an
NPDES permit authorizing such a discharge; the proposed discharge has been approved by the
State of California Department of Public Health and the operating agency of the impacted
reservoir; and the discharger has an approved fail-safe long-term disposal alternative.
5. The discharge of waste to inland surface waters, except in cases where the quality of the
discharge complies with applicable receiving water quality objectives, is prohibited. Allowances
for dilution may be made at the discretion of the San Diego Water Board. Consideration would
include streamflow data, the degree of treatment provided and safety measures to ensure
reliability of facility performance. As an example, discharge of secondary effluent would
probably be permitted if streamflow provided 100:1 dilution capability.
6. The discharge of waste in a manner causing flow, ponding, or surfacing on lands not owned or
under the control of the discharger is prohibited, unless the discharge is authorized by the San
Diego Water Board.

1

Where the Basin Plan prohibitions refer specifically to discharges to waters of the state, the prohibitions.

ATTACHMENT G – OCEAN PLAN AND BASIN PLAN PROHIBITIONS

188

G-1

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

7. The dumping, deposition, or discharge of waste directly into waters of the State, or adjacent to
such waters in any manner which may permit its being transported into the waters, is prohibited
unless authorized by the San Diego Water Board.
8. Any discharge to a storm water conveyance system that is not composed entirely of storm water
is prohibited unless authorized by the San Diego Water Board. [The federal regulations, 40
CFR section 122.26(b)(13), define storm water as storm water runoff, snow melt runoff, and
surface runoff and drainage. 40 CFR section 122.26(b)(2) defines an illicit discharge as any
discharge to a storm water conveyance system that is not composed entirely of storm water
except discharges pursuant to an NPDES permit and discharges resulting from firefighting
activities.] [section 122.26 amended at 56 FR 56553, November 5, 1991; 57 FR 11412, April 2,
1992].
9. The unauthorized discharge of treated or untreated sewage to waters of the State or to a storm
water conveyance system is prohibited.
10. The discharge of industrial wastes to conventional septic tank/ subsurface disposal systems,
except as authorized by the terms described in Water Code section 13264, is prohibited.
11. The discharge of radioactive wastes amenable to alternative methods of disposal into the
waters of the State is prohibited.
12. The discharge of any radiological, chemical, or biological warfare agent into waters of the State
is prohibited.
13. The discharge of waste into a natural or excavated site below historic water levels is prohibited
unless the discharge is authorized by the San Diego Water Board.
14. The discharge of sand, silt, clay, or other earthen materials from any activity, including land
grading and construction, in quantities which cause deleterious bottom deposits, turbidity or
discoloration in waters of the State or which unreasonably affect, or threaten to affect, beneficial
uses of such waters is prohibited.

ATTACHMENT G – OCEAN PLAN AND BASIN PLAN PROHIBITIONS

189

G-2

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

H.
ATTACHMENT H – DILUTION MODEL INFORMATION
The dilution model used to determine the dilution factor of the South Bay Ocean Outfall (SBOO) was
the USEPA-approved computer modeling application Visual Plumes (UM3 Model). The USEPA Visual
Plumes website is located at <http://www.epa.gov/ceampubl/swater/vplume/index.htm>. The dilution
model results are summarized in Table G.1 below.
Table 1: Summary of Visual Plumes dilution model results.

Ambient Profile1

Effluent Temperature
(oC)

Dilution Factor
at last Trap level

Dilution Factor
at Surface

January

17.52

159.0

159.0

159.0

159.0

123.2

142.9

108.2

No result

94.6

No result

110.1

No result

109.1

No result

108.0

No result

108.6

No result

114.3

130.9

124.1

142.7

No result

155.4

2

February

17.5

March

17.52
17.5

2

May

17.5

2

June

17.52

April

July
August
September
October
November
December
1
2

17.5

2

17.5

2

17.5

2

17.5

2

17.5

2

17.5

2

Ambient profiles developed from receiving water sampling location (I16) with data from June 2002 through
December 2004.
17.5 oC is the most conservative effluent temperature within the effluent profile from June 2002 through
December 2004.

Information about the SBOO and the outfall diffuser were obtained from the South Bay Water
Reclamation Plant Report of Waste Discharge and correspondence with Facility representatives. The
following description of the diffuser configuration was submitted by the Discharger and was used in
making assumptions for the input into the model:
There are 82 diffuser riser assemblies (potential of four ports per riser assembly) per leg, and one at
the wye structure for a total of 165 riser assemblies. The facility has three potential configurations per
diffuser riser assembly: blind flanged with no ports (and no heads); heads (and no blind flanges) with
four ports, which are temporarily closed; and heads (no blind flanges) with four open ports.
The naming convention of the assemblies is as follows: the wye is designated “W” and the south and
north legs have either a “S” prefix or a “N” prefix, respectively. The numbering starts near the wye
structure, with S82 and N82 located near the termini. There are 18 diffuser risers with open ports (72
open ports); they are W, S26, S52, and S68 through S82.

ATTACHMENT H – DILUTION MODEL INFORMATION

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H-1

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

There are three different sizes of ports; with diameters of 2-3/8”, 2-1/2”, and 2-5/8”. The smaller
diameter ports are closer to the wye and including the wye. The larger diameter ports are located closer
to the termini and the 2-1/2” are in between. There are 53 ports with a diameters of 2-3/8”, 52 at 2-1/2”,
and 60 at 2-5/8”.
Port diameter – 2.6 inches - Average diameter of the 72 open ports.
Port elevation – 0.0 meters – Ports are located on the ocean floor.
Vertical angle – 0 degrees.
Horizontal angle – 0 degrees – The diffuser ports alternated facing 0 degrees, 90 degrees, 180
degrees, and 270 degrees. This model does not have input abilities for a diffuser with ports facing
various directions. A single direction for all ports was assigned. This will result in a conservative
dilution factor.
Number of ports – 72 ports.
Port spacing – 6 feet – The dilution model does not have the ability to input the actual riser/port
configuration of the diffuser. The 72 ports were evenly distributed along a length of diffuser
representative of the length of diffuser of the south leg in which the majority of the open ports are
concentrated (S68 through S82), with additional length included to account for ports located on risers
W, S26, and S52.
Acute mix zone – Not relevant, value does not affect dilution factor as defined by the State Water
Board.
Chronic mix zone – Not relevant, value does not affect dilution factor as defined by the State Water
Board.
Port depth – 94 feet.
Effluent flow – 40 MGD – The total of permitted discharge flows through the SBOO. The actual
operating capacity of the outfall is 174 MGD with all ports open.
Effluent salinity – 2.24 mmho/cm – This value was the most conservative salinity value within the
effluent profile.
Effluent temp – 17.5 °C – This value was the most conservative temperature value within the effluent
profile.
Pollutant concentration – Not relevant, input does not affect dilution factor.
Ambient data – Monthly ambient data for June 2002 through December 2004 obtained from the
receiving water monitoring data (sample station I16) made available by SBWRP. Monthly salinity and
temperature data taken at offshore monitoring station I16 were averaged at each depth to establish an
ambient water profile for each month. The monthly profiles were used in Visual Plumes. For each
month and for each Visual Plumes run, initial dilution was interpreted to occur either when the plume
first reaches the surface, or at the last trapping level when the plume does not surface. The minimum
initial dilution was the lowest dilution factor attained using the May 2004 ambient profile.

ATTACHMENT H – DILUTION MODEL INFORMATION

191

H-2

U.S. Section of the International Boundary And Water Commission
South Bay International Wastewater Treatment Plant

Order No. R9-2014-0009
As Amended by Order Nos. R9-2014-0094
and R9-2017-0024, NPDES No. CA0108928

Far-field diffusion coefficient – 0.0003 m0.67/s2 - recommended in the Visual Plumes manual as a
conservative value.
Special Settings Tab, Farfield Diffusivity Option - 4/3 Power Diffusivity was chosen based on the
fact that the discharge is occurring in open water.
Special Settings Tab, Diffuser Port Contraction Coefficient - 0.61 - based on the use of cylindrical
ports in the diffuser.
Special Settings Tab, Standard Light Adsorption Coefficient - 0.16 - recommended in the manual
as a conservative value.

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