Attch. 04 NPDES Permit Order R9-2023-0009.pdf

CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD

SAN DIEGO REGION

2375 Northside Drive. Suite 100, San Diego, CA 92108

(619) 516-1990 - Fax (619) 516-1994 https://www.waterboards.ca.gov/sandiego/

ORDER NO. R9-2021-0001

AS AMENDED BY ORDER NO. R9-2023-0009

NPDES 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

THROUGH THE SOUTH BAY OCEAN OUTFALL

The following Discharger is subject to waste discharge requirements (WDRs) set forth in this Order:

Discharger United States Section of the International Boundary and Water Commission (USIBWC)

Name of Facility South Bay International Wastewater Treatment Plant South Bay Ocean Outfall Facility Address 2995 Clearwater Way

San Diego, CA 92154 San Diego County

Table 1. Discharge Location Discharge

Point Effluent Description

Discharge Point Latitude (North)

Discharge Point Longitude (West)

Receiving Water

Secondary-treated wastewater 32º 32’ 16” N 117º 11’ 00” W

Pacific Ocean

This Order was adopted on: May 12, 2021 This Order originally became effective on: July 1, 2021 This Order as amended by Order No. R9-2023-0009 became effective on: March 8, 2023 This Order shall expire on: June 30, 2026

U.S. International Boundary and Order No. R9-2021-0001 Water Commission As Amended by Order No R9-2023-0009 South Bay International Wastewater NPDES No. CA0108928 Treatment Plant

The Discharger shall file a Report of Waste Discharge (ROWD) as an application for reissuance of WDRs in accordance with title 23, California Code of Regulations (CCRs), and an application for reissuance of a National Pollutant Discharge Elimination System (NPDES) permit no later than 180 days prior to the Order expiration date. The United States Environmental Protection Agency (USEPA), and the California Regional Water Quality Control Board, San Diego Region (San Diego Water Board) have classified the discharge as a Major Discharge.

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 San Diego Water Board on the date indicated above and amended on March 8, 2023.

David W. Gibson, Executive Officer

South Bay International Wastewater NPDES No. CA0108928 Treatment Plant

TABLE OF CONTENTS

1. Facility Information

2. Findings

2.1. Legal Authorities

2.2. Background and Rationale for Requirements

2.3. Provisions and Requirements Implementing State Law

2.4. Executive Officer Delegation of Authority

2.5. Notification of Interested Parties

2.6. Consideration of Public Comment

3. Discharge Prohibitions

4. Effluent Limitations and Discharge Specifications

4.1. Effluent Limitations and Performance Goals – Discharge Point No. 001 .. 8

4.2. Land Discharge Specifications – Not Applicable

4.3. Recycling Specifications – Not Applicable

5. Receiving Water Limitations

5.1. Surface Water Limitation

5.2. Groundwater Limitations – Not Applicable

6. Provisions

6.1. Standard Provisions

6.2. Monitoring and Reporting Program (MRP) Requirements

6.3. Special Provisions

6.3.1. Reopener Provisions

6.3.2. Special Studies, Technical Reports, and Additional Monitoring Requirements

6.3.2.2. Sharing Transboundary Flow Information

with Interested Stakeholders

6.3.2.3. Spill and Transboundary Flow Event Notification

and Reporting Requirements

6.3.2.4. Spill Event Responsiveness and Remedial Actions

6.3.3. Best Management Practices and Pollution Prevention

6.3.4. Construction, Operation and Maintenance Specifications

6.3.5. Special Provisions for Wastewater Facility

6.3.5.1. South Bay Ocean Outfall Capacity Report

6.3.5.2 Treatment Plant Capacity

Exceedance Action Plan

6.3.5.3. Influent Action Levels

and Source Control Requirements

6.3.5.3.1. Influent Action Levels

6.3.5.3.2. Sharing Influent and Source Control Information

with Interested Stakeholders

6.3.5.3.3. Source Control Requirements for the Discharger

6.3.5.4. Sludge (Biosolids) Disposal Requirements

South Bay International Wastewater NPDES No. CA0108928 Treatment Plant

6.3.5.5. Resource Recovery from Anaerobically Digestible Material

6.3.6. Other Special Provisions – Not Applicable

6.3.7. Compliance Schedules – Not Applicable

7. Compliance Determination

7.1. Compliance with Average Monthly Effluent Limitation (AMEL)

7.2. Compliance with Average Weekly Effluent Limitation (AWEL)

7.3. Compliance with Maximum Daily Effluent Limitation (MDEL)

7.4. Compliance with Instantaneous Minimum Effluent Limitation

7.5. Compliance with Instantaneous Maximum Effluent Limitation

7.6. Compliance with Six-Month Median Effluent Limitation

7.7. Mass and Concentration Limitations

7.8. Percent Removal

7.9. Compliance with Single-constituent Effluent Limitations

7.10. Compliance with Effluent Limitations Expressed

as a Sum of Several Constituents

7.11. Multiple Sample Data Reduction

7.12. Mass Emission Rate (MER)

7.13. Bacterial Standards and Analysis

7.14. Single Operational Upset (SOU)

7.15. Chronic Toxicity

South Bay International Wastewater NPDES No. CA0108928 Treatment Plant

LIST OF TABLES

Table 1. Discharge Location Table 2. Effluent Limitations at Monitoring Location E-001 Table 3. Performance Goals at Monitoring Location E-001 Table 4. Influent Action Levels at Monitoring Location INF-001

LIST OF ATTACHMENTS

Attachment A – Abbreviations and Definitions ............................................................. A-1 Attachment B – Maps ................................................................................................... B-1 Attachment C – Flow Schematics ............................................................................... C-1 Attachment D – Standard Provisions........................................................................... D-1 Attachment E – Monitoring and Reporting Program (MRP) .......................................... E-1 Attachment F – Fact Sheet ........................................................................................... F-1 Attachment G – Discharge Prohibitions contained in the Ocean Plan and Basin Plan ..................................................................................... G-1

South Bay International Wastewater NPDES No. CA0108928

1. Facility Information

Information describing the South Bay International Wastewater Treatment Plant (SBIWTP), the South Bay Ocean Outfall (SBOO), and other related infrastructure, collectively referred to as the Facility, is summarized in Table 1 and in sections 1 and 2 of the Fact Sheet (Attachment F). Section 1 of the Fact Sheet also includes information regarding the USIBWC’s (Discharger’s) permit application.

2. Findings

The San Diego Water Board finds:

2.1. Legal Authorities

This Order serves as WDRs pursuant to article 4, chapter 4, division 7 of the California Water Code (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). This Order shall serve as an NPDES permit authorizing the Discharger to discharge into waters of the United States (U.S.) at the discharge location described in Table 1 subject to the WDRs in this Order.

2.2. 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 and G are also incorporated into this Order.

2.3. Provisions and Requirements Implementing State Law

The provisions/requirements in subsections 4.2, 4.3, and 5.2 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.

2.4. Executive Officer Delegation of Authority.

The San Diego Water Board by prior resolution has delegated all matters that may legally be delegated to its Executive Officer to act on its behalf pursuant to Water Code section 13223. Therefore, the Executive Officer is authorized to act on the San Diego Water Board’s behalf on any matter within this Order unless such delegation is unlawful under Water Code section 13223 or this Order explicitly states otherwise.

2.5. Notification of Interested Parties.

The San Diego Water Board has notified the Discharger and interested agencies and persons of its intent to prescribe WDRs for the discharge and has provided them with an opportunity to submit their written comments and recommendations. The San Diego Water Board has also provided an opportunity for the Discharger and interested agencies and persons to submit oral comments and recommendations at a public hearing. Details of the notification are provided in the Fact Sheet (Attachment F).

2.6. 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).

THEREFORE, IT IS HEREBY ORDERED, that this Order supersedes Order No. R9- 2014- 0009, as amended by Order Nos. R9-2014-0094, R9-2017-0024, and R9-2019-0012, 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. This action in no way prevents the San Diego Water Board from taking enforcement action for past violations of Order No. R9- 2014-0009.

3. Discharge Prohibitions

3.1. The discharge of waste from the Facility not treated by a secondary treatment process and not in compliance with the effluent limitations specified in section 4.1 of this Order, or to a location other than Discharge Point No. 001, unless specifically regulated by this Order or separate WDRs, is prohibited.

3.1.1. The Discharger shall be deemed in compliance with Discharge Prohibition 3.1 with respect to dry weather canyon collector Spill Events (as described in section

6.3.2.1.1.2 of this Order) if the Discharger implements its Spill and Transboundary Flow Event Prevention and Response Plan, as required by sections 6.3.2.1.2 and

6.3.2.1.3 of this Order, consistent with the actions and schedules therein. The Discharger may establish that it has implemented its Spill and Transboundary Flow Event Prevention and Response Plan by providing documentation that it complied with the plan in the 72 hours before and after the dry weather canyon collector Spill Event.

3.2. 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.

3.3. 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.

4. Effluent Limitations and Discharge Specifications

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

4.1.1. Effluent Limitations – Discharge Point No. 001

4.1.1.1. The Discharger shall maintain compliance with the following effluent limitations for the Facility, with compliance measured at Monitoring Location E-001, as described in the Monitoring and Reporting Program (MRP, Attachment E).

Table 2. Effluent Limitations at Monitoring Location E-001

P ar am et er [1

2]

U n it s

[3

S ix

-M o n th

M ed ia

A ve ra g e M o n th ly ra g e W ee kl y

M ax im u m D ai

In st an ta n eo u s

M in im u m an ta n eo u s

M ax im

Flow million gallons per day (MGD)

-- 25.0 -- -- -- --

Carbonaceous Biochemical Oxygen Demand 5-day @ 20°C

(CBOD5)

milligram per liter (mg/L)

-- 25 40 -- -- --

CBOD5

pounds per day (lbs/day)

-- 5,213 8,340 -- -- --

CBOD5 % Removal -- ≥85 -- -- -- --

Total Suspended Solids (TSS) mg/L -- 30 45 -- -- --

P ar am et er [1 it s

[3

S ix

-M o n th

M ed ra g e M o n ra g e W ee kl y

M ax im u m D an ta n eo u s

M in im an ta n eo u s

M ax im

TSS lbs/day -- 6,255 9,383 -- -- --

TSS % Removal -- ≥85 -- -- -- --pH standard units -- -- -- -- 6.0 9.0

Oil and Grease mg/L -- 25 40 -- -- 75

Oil and Grease lbs/day -- 5,213 8,340 -- -- 15,638

Settleable Solids milliliter per liter (ml/L)

-- 1.0 1.5 -- -- 3.0

Turbidity nephelometr ic turbidity unit (NTU)

-- 75 100 -- -- 225

Total Residual Chlorine microgram per liter (µg/L)

1.90E+02 -- -- 7.6E+02 -- 5.70E+03

Total Residual Chlorine lbs/day 3.96E+01 -- -- 1.58E+02 -- 1.19E+03

Chronic Toxicity [4][5]

“Pass/Fail” -- -- -- “Pass” -- --

Copper, Total Recoverable µg/L 9.76E+01 -- -- 9.58E+02 -- 2.68E+03

Copper, Total Recoverable lbs/day 2.03E+01 -- -- 2.00E+02 -- 5.59E+02 ar am et er [1 it s

[3

S ix

-M o n th

M ed ra g e M o n ra g e W ee kl y

M ax im u m D an ta n eo u s

M in im an ta n eo u s

M ax im

Mercury, Total Recoverable µg/L 3.78E+00 -- -- 1.52E+01 -- 3.82E+01

Mercury, Total Recoverable lbs/day 7.88E-01 -- -- 3.16E+00 -- 7.96E+00

Benzidine µg/L -- 6.60E-03 -- -- -- -- Benzidine lbs/day -- 1.38E-03 -- -- -- -- Chlordane µg/L -- 2.20E-03 -- -- -- -- Chlordane lbs/day -- 4.58E-04 -- -- -- -- Dichlorodiphen yltrichloroethan e (DDT) µg/L -- 1.60E-02 -- -- -- --

Dichlorodiphen yltrichloroethan e (DDT) lbs/day -- 3.39E-03 -- -- -- --

Heptachlor Epoxide µg/L -- 1.90E-03 -- -- -- --

Heptachlor Epoxide lbs/day -- 3.99E-04 -- -- -- --

Hexachloroben zene µg/L -- 2.00E-02 -- -- -- --

Hexachloroben zene lbs/day -- 4.19E-03 -- -- -- --

PCBs µg/L -- 1.80E-03 -- -- -- -- PCBs lbs/day -- 3.79E-04 -- -- -- --

TCDD

Equivalents µg/L -- 3.70E-07 -- -- -- --

TCDD

Equivalents lbs/day -- 7.77E-08 -- -- -- --

Toxaphene µg/L -- 2.00E-02 -- -- -- -- Toxaphene lbs/day -- 4.19E-03 -- -- -- --

Notes for Table 2

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

[2] 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 6.1 E-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.

[3] The Mass Emission Rate (MER) limitation, in lbs/day, was calculated based on the following equation: MER (lbs/day) = 8.34 x Q x C, where Q is the permitted flow for the Facility (25.0 MGD) and C is the concentration (mg/L).

[4] As specified in section 7.12 of this Order and section 3.3 of the MRP (Attachment E).

[5] The chronic toxicity effluent limitation is protective of both the numeric acute and chronic toxicity 2019 Ocean Plan water quality objectives. The effluent limitation will be implemented using Short-term Methods for Estimating the Chronic Toxicity of Effluents and Receiving Waters to West Coast Marine and Estuarine Organisms (EPA/600/R-95/136, 1995); current USEPA guidance in the National Pollutant Discharge Elimination System Test of Significant Toxicity Implementation Document (EPA 833-R-10-003, June 2010) (https://www3.epa.gov/npdes/pubs/wet_final_tst_implementation2010.pdf); and USEPA Regions 8, 9, and 10, Toxicity Training Tool (January 2010).

4.1.2. Performance Goals

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 Table 3. Performance goal parameters shall be monitored at Monitoring Location E-001, as described in the MRP (Attachment E). The San Diego Water Board will use the results for informational purposes only, not compliance determinations.

The performance goals in Table 3 are not water quality-based effluent limitations (WQBELs) and are not enforceable, as such.

Table 3. Performance Goals at Monitoring Location E-001 ar am et er [1

][2

U n it s

[3

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-M o

M ed o n ra g e

M ax im

D an ta n eo u s

M ax im

Arsenic, Total Recoverable µg/L 4.81E+02 -- 2.78E+03 7.36E+03 Arsenic, Total Recoverable lbs/day 1.00E+02 -- 5.80E+02 1.53E+03 ar am et er [1

][2

U n it s

[3

S ix

-M o n ra g e ax im an ta n eo u s

M ax im

Cadmium, Total Recoverable µg/L 9.56E+01 -- 3.82E+02 9.56E+02 Cadmium, Total Recoverable lbs/day 1.99E+01 -- 7.96E+01 1.99E+02 Chromium (VI), Total Recoverable [4] µg/L 1.91E+02 -- 7.65E+02 1.91E+03

Chromium (VI), Total Recoverable [4] lbs/day 3.98E+01 -- 1.60E+02 3.98E+02

Lead, Total Recoverable µg/L 1.91E+02 -- 7.65E+02 1.91E+03 Lead, Total Recoverable lbs/day 3.98E+01 -- 1.60E+02 3.98E+02 Nickel, Total Recoverable µg/L 4.78E+02 -- 1.91E+03 4.78E+03 Nickel, Total Recoverable lbs/day 9.97E+01 -- 3.98E+02 9.97E+02 Selenium, Total Recoverable µg/L 1.43E+03 -- 5.74E+03 1.43E+04 Selenium, Total Recoverable lbs/day 2.98E+02 -- 1.20E+03 2.98E+03 Silver, Total Recoverable µg/L 5.18E+01 -- 2.53E+02 6.54E+02 Silver, Total Recoverable lbs/day 1.08E+01 -- 5.28E+01 1.36E+02 Zinc, Total Recoverable µg/L 1.16E+03 -- 6.89E+03 1.84E+04 Zinc, Total Recoverable lbs/day 2.42E+02 -- 1.44E+03 3.84E+03

Cyanide, Total [5] µg/L 9.56E+01 -- 3.82E+02 9.56E+02

Cyanide, Total [5] lbs/day 1.99E+01 -- 7.96E+01 1.99E+02

Ammonia (expressed as nitrogen) µg/L 5.74E+04 -- 2.29E+05 5.74E+05

Ammonia (expressed as nitrogen) lbs/day 1.20E+04 -- 4.77E+04 1.20E+05

Phenolic Compounds (non-chlorinated) µg/L 2.87E+03 -- 1.15E+04 2.87E+04

Phenolic Compounds (non-chlorinated) lbs/day 5.98E+02 -- 2.40E+03 5.98E+03

Chlorinated Phenolics µg/L 9.56E+01 -- 3.82E+02 9.56E+02 Chlorinated Phenolics lbs/day 1.99E+01 -- 7.96E+01 1.99E+02 Endosulfan µg/L 8.60E-01 -- 1.72E+00 2.58E+00 Endosulfan lbs/day 1.79E-01 -- 3.59E-01 5.38E-01 Endrin µg/L 1.91E-01 -- 3.82E-01 5.74E-01 Endrin lbs/day 3.98E-02 -- 7.96E-02 1.20E-01 HCH (BHC) µg/L 3.82E-01 -- 7.65E-01 1.15E+00 ar am et er [1

][2

U n it s

[3

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-M o n ra im an ta n eo u s

M ax im

HCH (BHC) lbs/day 7.96E-02 -- 1.60E-01 2.40E-01

Radioactivity (alpha and beta particles) [6]

Picocuries per liter (pCi/L)

Acrolein µg/L -- 2.10E+04 -- -- Acrolein lbs/day -- 4.38E+03 -- -- Antimony µg/L -- 1.10E+05 -- -- Antimony lbs/day -- 2.29E+04 -- -- Bis(2-chloroethoxy) Methane µg/L -- 4.20E+02 -- -- Bis(2-chloroethoxy) Methane lbs/day -- 8.76E+01 -- -- Bis(2-chloroisopropyl) Ether µg/L -- 1.10E+05 -- -- Bis(2-chloroisopropyl) Ether lbs/day -- 2.29E+04 -- -- Chlorobenzene µg/L -- 5.40E+04 -- -- Chlorobenzene lbs/day -- 1.13E+04 -- -- Chromium (III), Total Recoverable µg/L -- 1.80E+07 -- --

Chromium (III), Total Recoverable lbs/day -- 3.75E+06 -- --

Di-n-butyl Phthalate µg/L -- 3.30E+05 -- -- Di-n-butyl Phthalate lbs/day -- 6.88E+04 -- -- Dichlorobenzenes µg/L -- 4.90E+05 -- -- Dichlorobenzenes lbs/day -- 1.02E+05 -- -- Diethyl Phthalate µg/L -- 3.20E+06 -- -- Diethyl Phthalate lbs/day -- 6.67E+05 -- -- Dimethyl Phthalate µg/L -- 7.80E+07 -- -- Dimethyl Phthalate lbs/day -- 1.63E+07 -- -- 4,6-dinitro-2-methylphenol µg/L -- 2.10E+04 -- -- 4,6-dinitro-2-methylphenol lbs/day -- 4.38E+03 -- -- 2,4-dinitrophenol µg/L -- 3.80E+02 -- -- 2,4-dinitrophenol lbs/day -- 7.92E+01 -- -- Ethylbenzene µg/L -- 3.90E+05 -- -- Ethylbenzene lbs/day -- 8.13E+04 -- -- Fluoranthene µg/L -- 1.40E+03 -- --ar am et er [1

][2

U n it s

[3

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-M o n ra im an ta n eo u s

M ax im

Fluoranthene lbs/day -- 2.92E+02 -- -- Hexachlorocyclopentadiene µg/L -- 5.50E+03 -- -- Hexachlorocyclopentadiene lbs/day -- 1.15E+03 -- -- Nitrobenzene µg/L -- 4.70E+02 -- -- Nitrobenzene lbs/day -- 9.80E+01 -- -- Thallium, Total Recoverable µg/L -- 1.90E+02 -- -- Thallium, Total Recoverable lbs/day -- 3.96E+01 -- -- Toluene µg/L -- 8.10E+06 -- -- Toluene lbs/day -- 1.69E+06 -- -- Tributyltin µg/L -- 1.30E-01 -- -- Tributyltin lbs/day -- 2.71E-02 -- -- 1,1,1-trichloroethane µg/L -- 5.20E+07 -- -- 1,1,1-trichloroethane lbs/day -- 1.08E+07 -- -- Acrylonitrile µg/L -- 9.60E+00 -- -- Acrylonitrile lbs/day -- 2.00E+00 -- -- Aldrin µg/L -- 2.10E-03 -- -- Aldrin lbs/day -- 4.38E-04 -- -- Benzene µg/L -- 5.60E+02 -- -- Benzene lbs/day -- 1.17E+02 -- -- Beryllium, Total Recoverable µg/L -- 3.20E+00 -- -- Beryllium, Total Recoverable lbs/day -- 6.67E-01 -- -- Bis(2-chloroethyl) Ether µg/L -- 4.30E+00 -- -- Bis(2-chloroethyl) Ether lbs/day -- 8.97E-01 -- -- Bis(2-ethlyhexyl) Phthalate µg/L -- 3.30E+02 -- -- Bis(2-ethlyhexyl) Phthalate lbs/day -- 6.88E+01 -- -- Carbon Tetrachloride µg/L -- 8.60E+01 -- -- Carbon Tetrachloride lbs/day -- 1.79E+01 -- -- Chlorodibromomethane µg/L -- 8.20E+02 -- -- Chlorodibromomethane lbs/day -- 1.71E+02 -- -- Chloroform µg/L -- 1.20E+04 -- -- Chloroform lbs/day -- 2.50E+03 -- -- 1,4-dichlorobenzene µg/L -- 1.70E+03 -- --ar am et er [1

][2

U n it s

[3

S ix

-M o n ra im an ta n eo u s

M ax im

1,4-dichlorobenzene lbs/day -- 3.54E+02 -- -- 3,3'-dichlorobenzidine µg/L -- 7.70E-01 -- -- 3,3'-dichlorobenzidine lbs/day -- 1.61E-01 -- -- 1,2-dichloroethane µg/L -- 2.70E+03 -- -- 1,2-dichloroethane lbs/day -- 5.63E+02 -- -- 1,1-dichloroethylene µg/L -- 8.60E+01 -- -- 1,1-dichloroethylene lbs/day -- 1.79E+01 -- -- Dichlorobromomethane µg/L -- 5.90E+02 -- -- Dichlorobromomethane lbs/day -- 1.23E+02 -- -- Dichloromethane µg/L -- 4.30E+04 -- -- Dichloromethane lbs/day -- 8.97E+03 -- -- 1,3-dichloropropene µg/L -- 8.50E+02 -- -- 1,3-dichloropropene lbs/day -- 1.77E+02 -- -- Dieldrin µg/L -- 3.80E-03 -- -- Dieldrin lbs/day -- 7.92E-04 -- -- 2,4-dinitrotoluene µg/L -- 2.50E+02 -- -- 2,4-dinitrotoluene lbs/day -- 5.21E+01 -- -- 1,2-diphenylhydrazine µg/L -- 1.50E+01 -- -- 1,2-diphenylhydrazine lbs/day -- 3.13E+00 -- -- Halomethanes µg/L -- 1.20E+04 -- -- Halomethanes lbs/day -- 2.50E+03 -- -- Heptachlor µg/L -- 4.80E-03 -- -- Heptachlor lbs/day -- 1.00E-03 -- -- Hexachlorobutadiene µg/L -- 1.30E+03 -- -- Hexachlorobutadiene lbs/day -- 2.71E+02 -- -- Hexachloroethane µg/L -- 2.40E+02 -- -- Hexachloroethane lbs/day -- 5.00E+01 -- -- Isophorone µg/L -- 7.00E+04 -- -- Isophorone lbs/day -- 1.46E+04 -- -- N-nitrosodimethylamine µg/L -- 7.00E+02 -- -- N-nitrosodimethylamine lbs/day -- 1.46E+02 -- -- N-nitrosodi-N-propylamine µg/L -- 3.60E+01 -- --ar am et er [1

][2

U n it s

[3

S ix

-M o n ra im an ta n eo u s

M ax im

N-nitrosodi-N-propylamine lbs/day -- 7.51E+00 -- -- N-nitrosodiphenylamine µg/L -- 2.40E+02 -- -- N-nitrosodiphenylamine lbs/day -- 5.00E+01 -- -- Polyaromatic Hydrocarbons (PAHs) µg/L -- 8.40E-01 -- --

(PAHs) lbs/day -- 1.75E-01 -- -- 1,1,2,2-tetrachloroethane µg/L -- 2.20E+02 -- -- 1,1,2,2-tetrachloroethane lbs/day -- 4.59E+01 -- -- Tetrachloroethylene µg/L -- 1.90E+02 -- -- Tetrachloroethylene lbs/day -- 3.96E+01 -- -- Trichloroethylene µg/L -- 2.60E+03 -- -- Trichloroethylene lbs/day -- 5.42E+02 -- -- 1,1,2-trichloroethane µg/L -- 9.00E+02 -- -- 1,1,2-trichloroethane lbs/day -- 1.88E+02 -- -- 2,4,6-trichlorophenol µg/L -- 2.80E+01 -- -- 2,4,6-trichlorophenol lbs/day -- 5.84E+00 -- -- Vinyl Chloride µg/L -- 3.40E+03 -- --

Vinyl Chloride lbs/day -- 7.09E+02 -- -- Notes for Table 3 [1] See Attachment A for definitions of abbreviations and a glossary of common terms used in this Order.

[2] 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 6.1 E-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.

[3] The MER limitation, in lbs/day, was calculated based on the following equation:

MER (lbs/day) = 8.34 x Q x C, where Q is the permitted flow for the Facility (25.0 MGD) and C is the concentration (mg/L).

[4] The Discharger may, at their option, apply this performance goal as a total chromium performance goal.

[5] If the Discharger can demonstrate to the satisfaction of the San Diego Water Board (subject to approval of an alternative test procedure (ATP) by USEPA) that an analytical method is available to reliably distinguish between strongly and weakly complexed cyanide, performance goals may be evaluated with the combined measurement of free cyanide, simple alkali metals cyanides, and weakly complexed organometallic cyanide complexes. For the analytical method to be acceptable, the recovery of free cyanide from metal complexes shall be comparable to that achieved by the approved method in 40 CFR part 136, as revised May 14, 1999.

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

4.1.3. Discharge Specifications

4.1.3.1. Waste management systems that discharge to the ocean must be designed and operated in a manner that will maintain the indigenous marine life and a healthy and diverse marine community.

4.1.3.2. Waste discharged to the ocean must be essentially free of:

4.1.3.2.1. Material that is floatable or will become floatable upon discharge;

4.1.3.2.2. Settleable material or substances that may form sediments which will degrade benthic communities or other aquatic life;

4.1.3.2.3. Substances which will accumulate to toxic levels in marine waters, sediments, or biota;

4.1.3.2.4. Substances that significantly decrease the natural light to benthic communities and other marine life; and

4.1.3.2.5. Materials that result in aesthetically undesirable discoloration of the ocean surface.

4.1.3.3. Waste effluents shall be discharged in a manner which provides sufficient initial dilution to minimize the concentrations of substances not removed in the treatment.

4.1.3.4. Location of waste discharges must be determined after a detailed assessment of the oceanographic characteristics and current patterns to assure that:

4.1.3.4.1. Pathogenic organisms and viruses are not present in areas where shellfish are harvested for human consumption or in areas used for swimming or other body-contact sports;

4.1.3.4.2. Natural water quality conditions are not altered in areas designated as being of special biological significance or areas that existing marine laboratories use as a source of seawater; and

4.1.3.4.3. Maximum protection is provided to the marine environment.

4.1.3.5. Waste that contains pathogenic organisms or viruses should be discharged a sufficient distance from shellfishing and water-contact sports areas to maintain applicable bacterial standards without disinfection. Where conditions are such that an adequate distance cannot be attained, reliable disinfection in conjunction with a reasonable separation of the discharge point from the area of use must be provided.

Disinfection procedures that do not increase effluent toxicity and that constitute the least environmental and human hazard should be used.

4.2. Land Discharge Specifications – Not Applicable

4.3. Recycling Specifications – Not Applicable

5. Receiving Water Limitations

5.1. 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 outside of the zone of initial dilution (ZID).

5.1.1. Bacterial Characteristics

5.1.1.1. 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;

5.1.1.1.1. Fecal Coliform

5.1.1.1.1.1. A thirty-day geometric mean of fecal coliform density not to exceed 200 CFU per 100 milliliters (mL) calculated based on the five most recent samples from each site, and

5.1.1.1.1.2. A single sample maximum not to exceed 400 CFU per 100 mL.

5.1.1.1.2. Enterococci

5.1.1.1.2.1. A six-week rolling geometric mean not to exceed 30 CFU per 100 mL, calculated weekly, and

5.1.1.1.2.2. A statistical threshold value of 110 CFU per 100 mL not to be exceeded by more than 10 percent of samples collected in a calendar month, calculated in a static manner.

5.1.1.2. The ZID of any 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.

5.1.1.3. At all areas where shellfish may be harvested for human consumption, as determined by the San Diego Water Board, the median total coliform density (CFU) 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.

5.1.2. Physical Characteristics

5.1.2.1. Floating particulates and grease and oils shall not be visible.

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

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

5.1.2.4. 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.

5.1.2.5. Trash shall not be present in ocean waters, along shorelines or adjacent areas in amounts that adversely affect beneficial uses or cause nuisance.

5.1.3. Chemical Characteristics

5.1.3.1. 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.

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

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

5.1.3.4. The concentration of substances set forth in chapter II, Table 3 of the Ocean Plan, shall not be increased in marine sediments to levels that would degrade indigenous biota.

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

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

5.1.3.7. Numerical water quality objectives established in chapter II, Table 3 of the Ocean Plan shall not be exceeded. Unless otherwise specified, all metal concentrations are expressed as total recoverable concentrations.

5.1.4. Biological Characteristics

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

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

5.1.4.3. 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.

5.1.5. Radioactivity

Discharge of radioactive waste shall not degrade marine life.

5.2. Groundwater Limitations – Not Applicable

6. Provisions

6.1. Standard Provisions

6.1.1. Federal Standard Provisions

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

6.1.2. San Diego Water Board Standard Provisions

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.

6.1.2.1. The Facility shall be supervised and operated by persons possessing certificates of appropriate grade pursuant to title 23, division 3, chapter 26 of the CCR. The Facility shall be provided with a sufficient number of qualified personnel to operate it effectively so as to achieve the required level of treatment at all times.

6.1.2.2. The expiration date of this Order is contained on page 1 of this Order. After the expiration date, the terms and conditions of this Order are automatically continued pending issuance of a new permit, provided that all requirements of USEPA’s NPDES regulations at title 40 of the Code of Federal Regulations (40 CFR) section

122.6 and the 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 WDRs are met.

6.1.2.3. The Discharger shall maintain a copy of this Order at a prominent location either in hard copy or electronic format. The Order shall be available to site personnel, San Diego Water Board, State Water Resources Control Board (State Water Board), and USEPA or their authorized representative at all times.

6.2. Monitoring and Reporting Program (MRP) Requirements

6.2.1. The Discharger shall comply with the MRP, and future revisions thereto, in Attachment E of this Order.

6.2.2. Notifications required to be provided under this Order to the San Diego Water Board shall be made to:

E-mail – SanDiego@waterboards.ca.gov Telephone – (619) 516-1990 Facsimile – (619) 516-1994

6.3. Special Provisions

6.3.1. Reopener Provisions

6.3.1.1. 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 4.1.2, Table 3, of this Order or as otherwise described in Table 3 of the Ocean Plan. (40 CFR section 122.44(d)(1))

6.3.1.2. 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 MRP (Attachment E).

6.3.1.3. This Order may be modified, revoked and reissued, or terminated for cause in accordance with the provisions of 40 CFR parts 122, 124, and 125 at any time prior to its expiration under any of the following circumstances:

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

6.3.1.3.2. Obtaining this Order by misrepresentation or failure to disclose fully all relevant facts. (Water Code section 13381(b)); and

6.3.1.3.3. A change in any condition that requires either a temporary or permanent reduction or elimination of the authorized discharge. (Water Code section 13381(c)).

6.3.1.4. 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 of this Order, or a notification of planned changes or anticipated noncompliance does not stay any condition of this Order. (40 CFR section 122.41(f))

6.3.1.5. If any applicable toxic effluent standard or prohibition (including any schedule of compliance specified in such effluent standard or prohibition) is promulgated under CWA section 307(a) 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 and reissue this Order to conform to the toxic effluent standard or prohibition. (40 CFR section 122.44(b)(1))

6.3.1.6. This Order may be reopened and modified for consistency with any new water quality control plan, policy, law, or regulation. (40 CFR section 122.62(a)(3).)

6.3.1.7. This Order may be reopened and modified to revise effluent limitations as a result of future Ocean Plan, Basin Plan, and/or other statewide Water Quality Control Plan amendments; or the adoption of a total maximum daily load (TMDL) for the receiving water. (40 CFR section 122.62(a)(2))

6.3.1.8. 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))

6.3.1.9. This Order may 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 endangerment to human health or the environment resulting from the permitted activity.

6.3.1.10. The performance goals, contained in section 4.1.2. of this Order, may be re-evaluated and modified during this Order term, or this Order may be modified to incorporate WQBELs, in accordance with the requirements set forth at 40 CFR sections 122.62 and 124.5.

6.3.1.11. This Order may be reopened and modified to provide for diversion of transboundary flows from the Tijuana River to the Facility for storage, treatment, and conveyance to the South Bay Ocean Outfall for discharge to the Pacific Ocean in accordance with the provisions of 40 CFR section 122.62.

6.3.2. Special Studies, Technical Reports, and Additional Monitoring Requirements

6.3.2.1. Spill and Transboundary Flow Event Types, and Flow Prevention and Response Plan

6.3.2.1.1. Event Types

Spill and transboundary flow event types are defined and categorized as set forth below. Event types do not include discharges to the Pacific Ocean at Discharge Point No. 001, discharges of waste from the Facility specifically regulated by this Order, or discharges determined by the San Diego Water Board to be sufficiently regulated by other waste discharge requirements or waivers thereof.

“Transboundary Flow Event” is a phrase defined in Attachment A of this Order and includes but is not limited to all Canyon Collector Transboundary Flow Events, Other Canyon Transboundary Flow Events, and Tijuana River Transboundary Flow Events.

6.3.2.1.1.1. Spill Event

A Spill Event is a discharge, or any other type of emission or release, of waste from any portion of the Facility due to system overflow, flow stoppage, system leaks and breaks, operational failure and/or infrastructure failure. Discharges excluded from this definition are described in Attachment F of this Order in section 6.2.2.1.4 of the Fact Sheet.

6.3.2.1.1.2. Canyon Collector Transboundary Flow Event

A Canyon Collector Transboundary Flow Event is any flow across the U.S.– Mexico international border under dry or wet weather conditions to any one of the five canyons equipped with a canyon collector system, including Smuggler’s Gulch, Goat Canyon, Canyon del Sol, Stewart’s Drain, or Silva Drain, that is not captured by the canyon collector system for treatment at the SBIWTP and disposal through the SBOO. A dry weather Canyon Collector Transboundary Flow Event also constitutes a Spill Event when transboundary flows less than or equal to the canyon collector’s maximum design capacity is not captured by the robert.kerns Highlight canyon collector for treatment at the SBWITP and disposal through the SBOO (i.e., dry weather canyon collector Spill Event). See section 2.1 of the Fact Sheet (Attachment F) for additional information on the maximum design capacity of the canyon collector systems.

6.3.2.1.1.3. Other Canyon Transboundary Flow Event

An Other Canyon Transboundary Flow Event is any flow across the U.S.– Mexico international border, under dry or wet weather conditions, at any transboundary canyon in the Tijuana River Valley that is not equipped with a canyon collector system, including but not limited to Yogurt Canyon.

6.3.2.1.1.4. Tijuana River Transboundary Flow Event

A Tijuana River Transboundary Flow Event is any flow across the U.S.– Mexico international border, under dry or wet weather conditions, in the Tijuana River.

6.3.2.1.2. Spill and Transboundary Flow Event Prevention and Response Plan

The Discharger shall prepare and submit an updated Spill and Transboundary Flow Event Prevention and Response Plan (Flow Prevention/Response Plan) for approval by the San Diego Water Board no later than 180 days after the effective date of this Order. The updated Flow Prevention/Response Plan shall be developed in consultation with interested stakeholders. For purposes of the Flow Prevention/Response Plan, interested stakeholders may include, but are not limited to, the San Diego Water Board, the County of San Diego Department of Environmental Health (DEH), non-governmental organizations (NGOs), or international partners, such as the Comisión International de Limites y Aguas (CILA, the Mexican Section of the IBWC). The Flow Prevention/Response Plan shall address each event type identified above, in section 6.3.2.1.1 of this Order in conformance with the following elements and informational requirements:

6.3.2.1.2.1. Goal. The Flow Prevention/Response Plan shall provide for the following:

6.3.2.1.2.1.1. The reduction, elimination and prevention of the recurrence of Spill and Transboundary Flow Events;

6.3.2.1.2.1.2. The protection of public health and safety; and

6.3.2.1.2.1.3. The prevention of adverse impacts to the environment from Spill and Transboundary Flow Events, including but not limited to, adverse impacts to waters of the U.S. and/or State.

6.3.2.1.2.2. Desired Outcomes. The Flow Prevention/Response Plan shall include specific provisions adequate to achieve the following desired outcomes:

6.3.2.1.2.2.1. The provisions shall provide for prompt notification and reporting of Spill Events and Tijuana River Transboundary Flow Events to appropriate regulatory agencies, municipalities, and other potentially affected entities;

6.3.2.1.2.2.2. The provisions shall provide effective measures for implementation to prevent, reduce, and eliminate Spill and dry weather Canyon Collector Transboundary Flow Events;

robert.kerns Highlight

6.3.2.1.2.2.3. The provisions shall provide effective remedial measures for implementation to

1) control or limit Spill Events, 2) terminate Spill Events, and 3) recover as much of Spill volume as possible for proper disposal, including any wash down water; and

6.3.2.1.2.2.4. The provisions shall provide a framework for achieving and implementing the goals and desired outcomes of the Flow Prevention/Response Plan by the Discharger. The framework for achieving and implementing the goals and desired outcomes of the Flow Prevention/Response Plan may include binational actions and cooperation with international partners, including CILA, 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), and NGOs.

6.3.2.1.2.3. Roles and Responsibilities. The Flow Prevention/Response Plan shall:

6.3.2.1.2.3.1. Identify the duly authorized individual(s) or position(s) having overall responsibility for the development and implementation of the Flow Prevention/Response Plan on behalf of the Discharger as described in Attachment D of this Order, Standard Provisions, section 5.2;

6.3.2.1.2.3.2. 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 Flow Prevention/Response Plan, on behalf of the Discharger;

6.3.2.1.2.3.3. Provide a complete description of the roles and responsibilities and lines of authority for implementation of the Flow Prevention/Response Plan with respect to the Discharger and appropriate interested stakeholders, including organization chart(s) or similar document(s). If the Discharger is unable to provide a complete description of the roles and responsibilities and lines of authority for implementation of the Flow Prevention/Response Plan, the Discharger shall explain the reason in its Flow Prevention/Response Plan.

6.3.2.1.2.4. Communication and Coordination with Interested Stakeholders. The Flow Prevention/Response Plan shall document the framework and procedures for coordination between the Discharger and interested stakeholders through regular meetings and written or oral communication to:

6.3.2.1.2.4.1. Develop procedures for reducing, eliminating, and preventing recurrence of Spill Events resulting from an emergency or unanticipated outages of wastewater infrastructure;

6.3.2.1.2.4.2. Develop emergency response and notification procedures for loss of wastewater infrastructure capacity;

6.3.2.1.2.4.3. Review existing plans, specifications, and reports of key wastewater infrastructure;

6.3.2.1.2.4.4. To the extent requested by interested stakeholders, assist interested stakeholders in preventing, reducing, terminating, and recovering transboundary flows;

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

6.3.2.1.2.4.6. Optimize use of available wastewater infrastructure capacity to achieve the goals and desired outcomes of the Flow Prevention/Response Plan. This topic may include, but is not limited to, increases in available sewage collection and treatment capacity, increases in wastewater flow diversion to the SBIWTP, reserve as much capacity of the treatment works as possible for untreated Tijuana sewage, and communication with interested stakeholders.

6.3.2.1.2.5. Inspection and Preventative Maintenance Program. The Flow 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, but not limited to, backup power and electrical systems. The inspection and preventative maintenance program shall include the following components:

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

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

The Flow Prevention/Response Plan shall provide for daily inspections of each canyon collector system and maintenance of a written log describing 1) the date, time, location and duration of the inspection, 2) the name of person(s) that conducted the inspection, 3) visual observations and photos of sediment and trash accumulation in the canyon collector basin, 4) any steps taken to remove accumulated sediment and trash, including estimates of the volume removed and how it was disposed, and 5) the condition of the canyon collector after maintenance, including if any sediment or trash was not able to be removed. The logs shall be submitted to the San Diego Water Board monthly as part of the monthly self-monitoring reports (SMRs). The Flow 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 system is reduced below its maximum design capacity from stoppage, blockage, debris obstructions, vandalism or other causes that impact or limit the flow of wastewater into the canyon collector systems and to the treatment plant. The Flow Prevention/Response Plan shall identify the best practices and procedures employed by the Discharger to reduce, prevent, or eliminate the severity and impact of reductions in canyon collector capacity and to restore the system’s functional capacity to handle Canyon Collector Transboundary Flow Events at the maximum design capacity flow rate as quickly as possible.