Attach 2 - Sewer System Management Plan Update — Hercules City Council, September 8, 2026

PREPARED BY

Sewer System Management Plan

PREPARED FOR

City of Hercules, California
WDID: 2SSO10141

FINAL | JUNE 2026

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Table of Contents
ELEMENT 1 Goal and Introduction ................................ ................................ ................................ ... 1-1

1.1 Introduction and Regulatory Context ............................................................................................ 1-1

1.1.1 Spill Definition ...................................................................................................................... 1-1

1.1.2 SSMP History and Public Access .......................................................................................... 1-2

1.1.3 SSMP Goals .......................................................................................................................... 1-2

1.2 SSMP Update and Internal Audit Schedule ................................................................................... 1-2

1.3 Sewer System Asset Overview ...................................................................................................... 1-3

1.3.1 Lateral Ownership Responsibilities ...................................................................................... 1-6

1.3.2 Data Management Systems ................................................................................................. 1-6 ELEMENT 2 Organization ................................ ................................ ................................ ................. 2-1

2.1 Legally Responsible Official ........................................................................................................... 2-1

2.2 Organization Chart ........................................................................................................................ 2-1

2.3 Roles and Responsibilities ............................................................................................................. 2-4

2.4 Chain of Communication for Reporting Spills ............................................................................... 2-4 ELEMENT 3 Legal Authority ................................ ................................ ................................ ............. 3-1

3.1 Prevention of Illicit Discharges ...................................................................................................... 3-1

3.1.1 Industrial Pretreatment Program ........................................................................................ 3-1

3.1.2 Grease, Oil, and Sand Interceptors. ..................................................................................... 3-2

3.2 Collaboration with Storm Sewer Agencies .................................................................................... 3-2

3.3 Design and Construction Standards .............................................................................................. 3-2

3.3.1 Wastewater Design Standards ............................................................................................. 3-2

3.4 Sewer Access Authority ................................................................................................................. 3-3

3.4.1 Service Lateral Access .......................................................................................................... 3-3

3.5 Enforcement Authority .................................................................................................................. 3-3 ELEMENT 4 Operations and Maintenance Program ................................ ................................ .......... 4-1

4.1 Map of Sanitary Sewer System ...................................................................................................... 4-1

4.2 Preventative Operation & Maintenance Activities ....................................................................... 4-3

4.2.1 Pipelines ............................................................................................................................... 4-3

4.2.1.1 Pipeline Inspection ..................................................................................................... 4-3

4.2.1.2 Manhole Inspection .................................................................................................... 4-3

4.2.2 Pumping/Lift Stations .......................................................................................................... 4-3

4.2.3 Force Mains .......................................................................................................................... 4-4

4.3 Training .......................................................................................................................................... 4-4

4.4 Equipment Inventory ..................................................................................................................... 4-4 ELEMENT 5 Design and Performance Provisions ................................ ................................ ............... 5-1

5.1 Updated Design Criteria ................................................................................................................ 5-1

5.1.1 Wastewater Design Standards ............................................................................................. 5-1

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Table of Contents

5.1.2 Sanitary Sewer Construction Specifications ........................................................................ 5-1

5.1.3 Lift Stations .......................................................................................................................... 5-1

5.1.4 Private Sewer Systems and Private Laterals ........................................................................ 5-1

5.2 Procedures and Standards............................................................................................................. 5-2 ELEMENT 6 Spill Emergency Response Plan ................................ ................................ ...................... 6-1

6.1 Notification, Monitoring, and Reporting Procedures .................................................................... 6-1

6.1.1 Contacts for Notification Purposes ...................................................................................... 6-2

6.2 Spill Response Procedures ............................................................................................................. 6-2

6.3 Training .......................................................................................................................................... 6-2

6.3.1 Contractor Training .............................................................................................................. 6-3

6.4 Coordination .................................................................................................................................. 6-3

6.5 Documentation and Review .......................................................................................................... 6-4

6.5.1 Program Review and Continuous Improvement ................................................................. 6-4 ELEMENT 7 Sewer Pipe Blockage Control Program ................................ ................................ ........... 7-1

7.1 Public Education and Outreach Plan ............................................................................................. 7-1

7.2 Disposal Plan .................................................................................................................................. 7-2

7.3 Legal Authority .............................................................................................................................. 7-2

7.3.1 Prohibition of Discharges ..................................................................................................... 7-2

7.3.2 Inspection and Enforcement Authority ............................................................................... 7-2

7.4 Grease Removal Devices, BMPs, and Reporting ........................................................................... 7-2

7.5 Hot Spot Identification and Cleaning Schedule ............................................................................. 7-3

7.6 Source Control Measures .............................................................................................................. 7-3 ELEMENT 8 System Evaluation, Capacity Assurance and Capital Improvements ................................ ........ 8-1

8.1 System Evaluation and Condition Assessment .............................................................................. 8-1

8.2 Capacity Assessment and Design Criteria...................................................................................... 8-2

8.2.1 Hydraulic Deficiency and Spill Risk Identification ................................................................ 8-3

8.3 Prioritization of Corrective Action ................................................................................................. 8-5

8.4 Capital Improvement Plan ............................................................................................................. 8-5

8.4.1 Rehabilitation Program ........................................................................................................ 8-5

8.4.2 Current CIP ........................................................................................................................... 8-5

8.4.3 Coordination and Funding .................................................................................................... 8-7 ELEMENT 9 Monitoring, Measurement, and Program Modifications ................................ ................. 9-1

9.1 Overview ........................................................................................................................................ 9-1

9.2 Maintaining Relevant Information ................................................................................................ 9-1

9.3 SSMP Effectiveness ........................................................................................................................ 9-1

9.4 Key Performance Metrics .............................................................................................................. 9-2

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Table of Contents

9.5 Spill Trend Metric Results .............................................................................................................. 9-2

9.5.1 Total Number of Spills per Year ........................................................................................... 9-2

9.5.2 Total Volume of Spills per Year ............................................................................................ 9-3

9.5.3 Spill Rate .............................................................................................................................. 9-4

9.6 Preventive Maintenance Program Metric Results ........................................................................ 9-5

9.7 Program Modifications .................................................................................................................. 9-6 ELEMENT 10 Internal Audits ................................ ................................ ................................ .......... 10-1

10.1 Overview .................................................................................................................................... 10-1

10.2 Audit Scope and Process ........................................................................................................... 10-1

10.3 Audit Frequency and Schedule .................................................................................................. 10-1

10.4 Audit Findings and Reports ....................................................................................................... 10-2

10.5 SSMP Update Process ................................................................................................................ 10-2 ELEMENT 11 Communication Plan ................................ ................................ ................................ . 11-1

11.1 Public Communication ............................................................................................................... 11-1

LIST OF TABLES
Table 1-1. SSMP Audit and Update Schedule ...................................................................................... 1-3 Table 1-2. Approximate Gravity Sewer Size Distribution .................................................................... 1-3 Table 1-3. Lift Station Locations and Descriptions .............................................................................. 1-3 Table 1-4. Force Main Descriptions ..................................................................................................... 1-6 Table 2-1. Legally Responsible Officials (2025) ................................................................................... 2-1 Table 2-2. Roles and Responsibilities Defined ..................................................................................... 2-3 Table 2-3. Responsible Officials in SSMP Development ...................................................................... 2-4 Table 8-1. Capacity-Related Capital Improvement Projects ............................................................... 8-5 Table 8-2. Ten-Year Sewer Capital Improvement Plan ........................................................................ 8-6 Table 9-1. Total Volume of Spills per Year .......................................................................................... 9-4 Table 9-2. Preventive Maintenance Performance Metric Results (2020-2024) .................................. 9-6

LIST OF FIGURES
Figure 1-1. Wastewater Collection System Service Area .................................................................... 1-5 Figure 2-1. City of Hercules SSMP Responsibility Organizational Chart .............................................. 2-2 Figure 2-2. City of Hercules Spill Reporting Flow Chart ....................................................................... 2-5 Figure 4-1. Wastewater Collection System ......................................................................................... 4-2 Figure 8-1. CIP Recommendations ...................................................................................................... 8-4

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Table of Contents
Figure 9-1. Number of Spills per Year .................................................................................................. 9-3 Figure 9-2. Spills per 100 Miles of Gravity Main ................................................................................. 9-5

LIST OF APPENDICES
Appendix A. Responsible Officials Contact Information
Appendix B. 2025 Pollution Minimization Report
Appendix C. Hot Spot List
Appendix D. Critical Parts and Major Equipment
Appendix E. SERP Spill Emergency Response Plan
Appendix F. Contra Costa Clean Water Program Public Outreach Materials Appendix G. City of Hercules 2024 SSMP Audit Report
Appendix H. SSMP Update Change Log

LIST OF ACRONYMS AND ABBREVIATIONS
AC Asbestos Cement
BMP Best Management Practices
Refers to the procedures employed in commercial kitchens to minimize the quantity of grease that is discharged to the sanitary sewer system.

Examples include scraping food scraps into a garbage can and dry wiping dishes and utensils prior to washing.

Building Lateral See Private Sewer Lateral
CCTV Closed Circuit Television
Refers to the process and equipment that is used to internally inspect the condition of gravity sewers.

CIP Capital Improvement Program
Refers to the document that identifies future capital improvements to the City’s sanitary sewer system.

City Refers to the City of Hercules
CIWQS California Integrated Water Quality System
Refers to the State Water Resources Control Board online electronic reporting system that is used to report Spills, certify completion of the SSMP, and provide information on the sanitary sewer system.

CMMS Computerized Maintenance Management System
Refers to the computerized maintenance management system that is used to plan, dispatch, and record the work on its sanitary sewer system.

CWEA California Water Environment Association
CY Calendar Year
DIP Ductile Iron Pipe
DS Data Submitters

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FOG Fats, Oils, and Grease
Refers to fats, oils, and grease typically associated with food preparation and cooking activities that can cause blockages in the sanitary sewer system.

FY Fiscal Year
Refers to the 12-month periods beginning July 1st and ending June 30th.

FSE Food Service Establishment
Refers to commercial or industrial facilities where food is handled/prepared/served that discharge to the sanitary sewer system.

WDR General Waste Discharge Requirements
Refers to the State Water Resources Control Board Order No. 2022-0103- DWQ, Statewide General Waste Discharge Requirements for Sanitary Sewer Systems, dated June 5, 2023.

GIS Geographical Information System
Refers to the City’s system that is used to capture, store, analyze, and manage geospatial data associated with the City’s sanitary sewer system assets.

GRD Grease Removal Device
Refers to grease traps and grease interceptors that are installed to remove FOG from the wastewater flow at food service establishments.

I/I Infiltration/Inflow
Refers to water that enters the sanitary sewer system from storm water and groundwater.

Infiltration enters through defects in the sanitary sewer system after flowing through the soil.

Inflow enters the sanitary sewer without flowing through the soil. Typical points of inflow are holes in manhole lids and direct connections to the sanitary sewer (e.g. storm drains, area drains, and roof leaders).

Lateral See Private Sewer Lateral
LRO Legally Responsible Official
Refers to person(s) formally designated by an agency to be responsible for formal reporting and certifying of all reports submitted to the CIWQS.

MH Manhole
Refers to an engineered structure that is intended to provide access to a sanitary sewer for maintenance and inspection.

Mainline Sewer Refers to City wastewater collection system piping that is not a private lateral connection to a user.

Maintenance Hole See Manhole
MMPM Monitoring, Measurement, and Plan Modifications
NPDES National Pollution Discharge Elimination System Permit Notification of a Spill Refers to the time at which the City becomes aware of a Spill event through observation or notification by the public or other source.

OES Office of Emergency Services
Refers to the California State Office of Emergency Services.

O&M Operations and Maintenance
OERP Overflow Emergency Response Plan

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PM Preventive Maintenance
Refers to maintenance activities intended to prevent failures of the sanitary sewer system facilities (e.g. cleaning, CCTV, repair, etc.).

Private Sewer Lateral Refers to the portion of a private property’s building sewer as defined by the plumbing code, and is further defined as the piping of a drainage system that extends from the end of the building drain to the public sewer which includes the connection to the public sewer.

PS Pump Station
A facility that transmits and lifts sewage into the City gravity sanitary sewer collection system
PVC Polyvinylchloride Pipe
RWQCB Regional Water Quality Control Board
Refers to the San Francisco Bay Regional Water Quality Control Board.

Spill Sanitary Sewer Spill
Refers to discharge of sewage from any portion of a sanitary sewer system due to a sanitary sewer system overflow, operational failure, and/or infrastructure failure.

Sanitary Sewer System or
Sewer System
Refers to the sanitary sewer facilities that are owned and operated by the City.

SSMP Sewer System Management Plan
SOP Standard Operating Procedures
Refers to written procedures that pertain to specific activities employed in the operation and maintenance of the Sanitary Sewer System.

SWRCB State Water Resources Control Board
Refers to the California Environmental Protection Agency, State Water Resources Control Board.

Note: The State Board is a separate entity from the San Francisco Bay Regional Water Quality Control Board, although the two agencies are closely connected.

SCADA Supervisory Control and Data Acquisition
Refers to the system that is employed by the City to monitor the performance of its lift stations and to notify the operating staff when there is an alarm condition that requires attention.

VCP Vitrified Clay Pipe
Water of the State Refers to “any surface water or groundwater, including saline waters, within the boundaries of the state.” (California Water Code § 13050(e)).

WWTP Wastewater Treatment Plant

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ELEMENT 1
Goal and Introduction
SWRCB Requirement (Order WQ 2022-0103-DWQ):

The goal of the Sewer System Management Plan (Plan) is to provide a plan and schedule to: (1) properly manage, operate, and maintain all parts of the Enrollee’s sanitary sewer system(s), (2) reduce and prevent spills, and (3) contain and mitigate spills that do occur. The Plan must include a narrative Introduction section that discusses the following items:

1.1 Regulatory Context: The Plan Introduction section must provide a general description of the local sewer system management program and discuss Plan implementation and updates.

1.2 Sewer System Management Plan Update Schedule : The Plan Introduction section must include a schedule for the Enrollee to update the Plan, including the schedule for conducting internal audits. The schedule must include milestones for incorporation of activities addressing prevention of sewer spills.

1.3 Sewer System Asset Overview : The Plan Introduction section must provide a description of the Enrollee-owned assets and service area . Additionally, the Plan Introduction section must provide reference to the Enrollee’s up -to-date map of its sanitary sewer system, as required in section 4.1 (Updated Map of Sanitary Sewer System) of this Attachment.

1.1 INTRODUCTION AND REGULATORY CONTEXT
This Sewer System Management Plan (SSMP) is a compendium of the policies, procedures, and activities that are included in the planning, management, operation, and maintenance of the City of Hercules (City) sanitary sewer system, , Waste Discharge Identification Number (WDID): 2SSO10141.

The State Water Resources Control Board (SWRCB) has adopted statewide Waste Discharge Requirements (WDR) for sanitary sewer systems under Order No. 2022 -0103-DWQ, effective June 5, 2023, which establishes requirements for the development, implementation, and periodic update of an SSMP. This Order supersedes and consolidates prior regulatory requirements, including earlier orders and amendments, and incorporates mo nitoring and reporting requirements directly within the WDR. This SSMP has been prepared to upd ate the City’s existing SSMP in accordance with the current WDR and applicable guidance. The structure and organization of this SSMP follows the above referenced WDR and contains language taken from the WDR as at that beginning of each element. The WDR uses the term “Enrollee” to mean each individual municipal wastewater agency that has completed and submitted the required application for coverage under the WDR (in this case, the Enrollee is the City). The City’s waste discharger identification number in the California Integrated Water Quality System (CIWQS) is 2SSO10141.

1.1.1 Spill Definition
Sanitary sewer spills are categorized and defined as follows. • Category 1: Discharge of untreated or partially treated wastewater of any volume resulting from a sanitary sewer system failure or flow condition that either reaches surface water and/or drainage channel tributary to a surface water, or reaches a Municipal Separate Storm Sewer System (MS4) and is not fully captured and returned to the sanitary sewer system or otherwise captured and disposed of properly.

Element 1
Goal and Introduction

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• Category 2: Discharge of untreated or partially treated wastewater greater than or equal to 1,000 gallons resulting from a sanitary sewer system failure or flow condition that either does not reach surface water, a drainage channel, or an MS4, or the entire Spill discharged to the storm drain system was fully recovered and disposed of properly. • Category 3: Discharge of untreated or partially treated wastewater greater than or equal to 50 gallons and less than 1,000 gallons resulting from a sanitary sewer system failure or flow condition that does not reach surface water.
• Category 4: Discharge of untreated or partially treated wastewater less than 50 gallons resulting from a sanitary sewer system failure or flow condition that does not reach surface water.

1.1.2 SSMP History and Public Access
The City’s first SSMP was finalized in August 2009 and has been formally updated on the following occasions:
• 2014: Updated following 2011 audit
• 2019: Updated following 2017 audit
A certified copy of the SSMP, approved by the City Council at a public meeting, is maintained at the Public Works Department and posted at https://www.herculesca.gov/government/engineering-public-works/sanitary- sewer. Supporting documents are not available to the public to maintain the security of the City’s system.

Supporting documents are available to SWRCB or Regional Water Board staff upon request.

1.1.3 SSMP Goals
The goals of the City of Hercules SSMP are:
• To properly manage, operate, and maintain the City’s sanitary collection system through proper planning and implementation;
• To provide adequate capacity to convey flows by analyzing, identifying, monitoring, and correcting, areas of the collection system that are or could be considered insufficiently sized; • To minimize the number and frequency of sanitary sewer spills (Spills) through a proactive inspection and maintenance program of the City’s sanitary collection system; and • To mitigate the impact of Spills through quick response times, thorough cleanup, and public notifications

1.2 SSMP UPDATE AND INTERNAL AUDIT SCHEDULE
This update to the SSMP is based on the City’s 2024 SSMP Audit Report. The audit and next update schedule for this SSMP are provided in Table 1-1.

Element 1
Goal and Introduction

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Table 1-1. SSMP Audit and Update Schedule
Update Due Date Frequency/Notes
SSMP Audit 8/2/2027 Required every 3 years. Evaluates implementation effectiveness and informs the next update cycle.

SSMP Update 8/2/2031 Required at least every 6 years.

Source: https://www.waterboards.ca.gov/water_issues/programs/sso/lookup/

1.3 SEWER SYSTEM ASSET OVERVIEW
The City’s wastewater collection system serves the area within City limits in Contra Costa County (see Figure 1-1) and conveys an average dry weather flow of approximately 1.2 million gallons per day (mgd) of wastewater. This service area encompasses an existing population of approximately 26,000, with an additional 3,000 residents expected at full buildout of the service area . The system currently has 8,433 connections, with greater than 98 percent residential connections. The wastewater generated by the City is conveyed to and treated by the Pinole-Hercules Water Pollution Control Plant (WPCP), located southwest of the City limits in the City of Pinole.

The collection system includes approximately 62 miles of gravity sewer mains and 1,660 manholes, most of which were constructed after 1970. Gravity sewers located in the older areas of the City are believed to be constructed of asbestos cement (AC) pipe, also known as “Transite” pipe. New gravity sewer construction is typically polyvinylchloride (PVC) or High Density Polyethylene (HDPE) pipe. The City also owns six pump stations within the collection system, and approximately 3.8 miles of associated force mains inclusive of the Pinole WWTP effluent force main. The composition of the sewer pipes by size are provided in Table 1-2 and the lift stations are described in Table 1-3. A map of the wastewater collection system is provided in Element 4, Operations and Maintenance Activities.

Table 1-2. Approximate Gravity Sewer Size Distribution
Diameter Portion of Sewer System, % (by length)
Less than 10-inch 90
10-inch or greater 10

Table 1-3. Lift Station Locations and Descriptions
Lift Station
Name Location
Number
of Pumps
Install
Year
Firm Capacity,
mgd
Pump
Manufacturer
Pump
HP
Willow 811 Dover 2 1981 0.80 Paco 30
John Muir John Muir Parkway and
Alfred Nobel Drive 2 2004 1.70 Flygt 10
Industrial Sanderling Drive and
Willet Street 2 1985 2.00 Paco 30
Bayside Woodfield and Fawcett 2 1984 0.50 Paco 5
Victoria Near 193 Trestle Cove 2 2001 0.72 Cornell 25
Promenade Bayfront Boulevard and
Promenade Street 2 2002 0.43 Flygt 10
Element 1
Goal and Introduction

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The City also operates the associated force mains shown in Table 1 -4. Many of the force mains were installed at the time of the original construction of the associated lift stations.

Table 1-4. Force Main Descriptions
Name of Lift Station Associated
with Force Main Size, inches Length, linear feet
Willow 8 2,716
John Muir 8 12
Industrial 10 770
Bayside 8 675
Victoria 6 2,400
Promenade 6 370
Pinole WWTP Effluent 24 13,200

City Limits
Figure 1-1
Wastewater
Collection System
Service Area0 3,750 7,500
FeetN
City of Hercules
Sewer System
Management Plan
Prepared for:

Prepared by:

Fig 1-1. Wastewater Collection System Service Area: N:\Clients\682 City of Hercules\60-26-11 2025 SSMP Update\GIS\PRO\Hercules SSMP Update.aprx - ggrgich - 4/28/2026 Element 1
Goal and Introduction

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1.3.1 Lateral Ownership Responsibilities
The City adopted Sewer Lateral Ordinance No. 457 on May 13, 2010, establishing enforceable performance standards for private sewer laterals connected to City sewer mains. The ordinance is intended to maintain the sewer system in reliable operating conditio n, reduce infiltration and inflow, minimize sewer overflows, and protect public health and safety.

Under the ordinance, private sewer laterals must be cleaned and inspected upon certain triggering events, such as a change in use to commercial, restaurant, or industrial; repair or replacement of the building sewer lateral; a City-determined public health need; or sale or transfer of the property. The City may also require inspection upon request.

To obtain a Sewer Lateral Certificate of Compliance, property owners must submit a completed application, the required fee, and a video inspection performed by a state -licensed plumbing contractor on physical media (CD/DVD or flash drive).

1.3.2 Data Management Systems
Asset inventory, work orders, and spill tracking are currently managed through spreadsheet -based recordkeeping. Regulatory spill reports are filed through CIWQS. Hydraulic modeling is performed in InfoSewer, a GIS -based one-dimensional modeling software us ed for capacity analysis and planning of gravity sewer systems, which is compatible with the City's collection system GIS. Spatial data and GIS files developed during the 2020 Sewer Collection System Master Plan Update are stored in Lightbox LandVision, the City's primary platform for spatial data management and system mapping.

The City is evaluating opportunities to implement a Computerized Maintenance Management System (CMMS) to improve recordkeeping, work order tracking, and asset management capabilities as part of ongoing program improvements.

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ELEMENT 2
Organization
SWRCB Requirement (Order WQ 2022-0103-DWQ):

The Plan must identify organizational staffing responsible and integral for implementing the local Sewer System Management Plan through an organization chart or similar narrative documentation that includes:
• The name of the Legally Responsible Official as required in section 5.1 (Designation of a Legally Responsible Official);
• The position titles, telephone numbers, and email addresses for management, administrative, and maintenance positions responsible for implementing specific Sewer System Management Plan elements;
• Organizational lines of authority; and Chain of communication for reporting spills from receipt of complaint or other information, including the person responsible for reporting spills to the State and Regional Water Boards and other agencies, as applicable.

2.1 LEGALLY RESPONSIBLE OFFICIAL
The City has designated a Legally Responsible Official (LRO) responsible for certifying all spill reports, SSMP updates, and other required submittals to the State Water Board through CIWQS . Current designations are identified in Table 2-1.

Table 2-1. Legally Responsible Officials (2025)
Personnel Title
Chris Morris Public Works Superintendent

2.2 ORGANIZATION CHART
Figure 2 -1 illustrates the organizational structure specific to SSMP implementation and compliance responsibilities. Key personnel involved in the management, operation, and oversight of the City’s sanitary sewer system, including staff responsible for spill response, reporting, and compliance with the WDR are described in Table 2-1. The designated LROs and staff involved in program audits, asset management, and enforcement activities are also shown.

Element 2
Organization

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Figure 2-1. City of Hercules SSMP Responsibility Organizational Chart

City Council
City Manager
Public Works
Director / City
Engineer
Public Works
Superintendent
Maintenance
Supervisor
(4) Maintenance
Worker II
(2) Maintenance
Worker I
Public Works
Inspector
Assistant Civil
Engineer
Planning
Director
Building Permit
Technician
City Attorney
Element 2
Organization

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Table 2-2. Roles and Responsibilities Defined
Position Roles and Responsibilities
City Council Establishes policy; adopts the SSMP.

Interim City Manager
Patrick Tang
City Hall: (510) 799-8200
Plans, organizes and directs the overall administrative activities and operations of the City. Advises and assists the City Council, represents the City’s interest with other governmental agencies, business interests, and the community.

Public Works Director/City Engineer
(LRO)

Vacant
Plans, directs, organizes, coordinates, supervises and reviews the activities of the divisions comprising the Public Works Department; and provides highly responsible professional and technical staff assistance to the City Manager.

Assistant Civil Engineer
Jose Pacheco
Desk: (510) 799-8247
[email protected]
Plans, coordinates, supervises, and participates in the performance of professional engineering activities of a complex nature involving engineering planning and design, construction project management.

Public Works Inspector/Specialist
Armando Alvarez
Desk: (510) 799-8242
(510) 617-6768
Performs specialized field and office technical duties including inspecting public and private improvement projects for conformance with approved plans, specifications, and City standards; administers the encroachment permit and sewer lateral programs; and supports the Building Division on code enforcement matters. Maintains project records and serves as a City representative to contractors and the public.

Community Development Specialist
(Building Permit Specialist)
Shiva Mantinpour
Phone: (510) 799-8244
Reviews and processes building permit applications for completeness and conformance with applicable codes, regulations, and City standards; coordinates with applicants, contractors, and other departments to facilitate permit issuance.

Public Works Superintendent (LRO)
Chris Morris
[email protected]
Plans, directs, organizes, coordinates, supervises and reviews the activities of the divisions comprising the Public Works Department; and provides highly responsible professional and technical staff assistance to the City Manager.

Plans, coordinates, lays out the work assignments and supervises the work of a number of crews involved in the operation and maintenance of wastewater system, and provides technical staff assistance.

Maintenance Supervisor
Vergel Botin
Work Cell: (510) 691-5387
[email protected]
Supervises, schedules, and evaluates Maintenance staff as they conduct maintenance, construction, and repair activities; inspects completed work for quality and safety compliance; and coordinates with management on priorities, materials, and equipment needs. May perform the full range of duties of subordinate classifications.

Maintenance Worker I (2)& II (4) Participates in maintenance and repair duties and performs a wide variety of skilled and semi-skilled maintenance, construction, and repair work, and operates light and moderately heavy power-driven equipment.

Maintenance Contractor (H&R
Plumbing and Drain Cleaning
Phone: (510) 222-5556
Supplements City maintenance staff to perform hotspot cleaning, CCTV, and vactor services as needed.

Electrician
(CalCon Systems, Outside Contractor)
Phone: (925) 277-0665
Under direction, performs skilled work in the installation, maintenance and repair of electrical wiring and related apparatus, components of the sanitary and storm collections systems.

Element 2
Organization

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Table 2-2. Roles and Responsibilities Defined
Position Roles and Responsibilities
Mechanical Engineer (Andres
Mechanical and General Engineering,
Outside Contractor)
Phone: (925) 978-0224
Under direction, performs skilled work in the installation, maintenance, and repair of mechanical assets.

2.3 ROLES AND RESPONSIBILITIES
The Public Works (PW) Superintendent is the sole legally responsible officer responsible for signing and certifying all applicable SSMP documents. Roles and responsibilities for the collection system operations are identified in Table 2-3.

The Public Works Superintendent has the overall responsibility for implementing, periodically auditing, and maintaining the City’s SSMP. Certain tasks may be delegated to staff.

Other City staff responsible for developing, implementing, and maintaining specific elements of the City’s SSMP are identified by job title in Table 2 -2 above. Names and contact information are included in Appendix A.

Table 2-3. Responsible Officials in SSMP Development
Element Element Name Responsible City Official
I Introduction & Goals PW Superintendent
II Organization PW Superintendent
III Legal Authority PW Superintendent
IV Operations and Maintenance Program PW Superintendent V Design and Performance Provisions PW Superintendent
VI Spill Emergency Response Plan (SERP) PW Superintendent VII Sewer Pipe Blockage Control Program PW Superintendent VIII System Evaluation, Capacity Assurance, and CIP PW Superintendent IX Monitoring, Measurement, and Program Modification PW Superintendent X Internal Audits PW Superintendent
XI Communication Plan Assistant Civil Engineer

2.4 CHAIN OF COMMUNICATION FOR REPORTING SPILLS
Spills are reported in accordance with the chain of communications provided on Figure 2-2.

Element 2
Organization

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Figure 2-2. City of Hercules Spill Reporting Flow Chart

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ELEMENT 3
Legal Authority
SWRCB Requirement (Order WQ 2022-0103-DWQ):

The Plan must include copies or an electronic link to the Enrollee’s current sewer system use ordinances, service agreements and/or other legally binding procedures to demonstrate the Enrollee possesses the necessary legal authority to:
• Prevent illicit discharges into the sanitary sewer system from I&I, unauthorized stormwater, chemical dumping, debris, roots, FOG, and trash causing blockages. • Coordinate with storm sewer agencies on spill response, system access during spills, and avoiding cross-connections.
• Require proper design and construction of sewer components and connections. • Ensure access for maintenance, inspection, and repairs of Enrollee-owned service lateral portions
• Enforce violations of sewer ordinances, service agreements, or other binding procedures. • Secure easement access where needed for system operations and maintenance

The Hercules Municipal Code ( HMC) is available online (https://www.herculesca.gov/government/city- clerk/municipal-code) and describes the City’s current legal authority required for compliance with the WDR. That authority is specifically contained within HMC Title 5 (Sanitation and Health), Chapter 4 (Sanitary Sewers). The relevant HMC sections, and permit addressing components of this element are provided and summarized below. The City’s Standard Plans, Design Standards, Standard Specifications is also cited.

3.1 PREVENTION OF ILLICIT DISCHARGES
HMC Section 5-4.06 Prohibited Wastes.

The discharge of substances that could obstruct flow, damage sewer facilities, endanger public health, or interfere with wastewater treatment processes is prohibited. Prohibited materials include unauthorized stormwater, chemicals, debris, fats, oils, grease (FOG), roots, and other materials that may cause blockages, spills, or system degradation. The City coordinates with the Pinole -Hercules Water Pollution Control Plant (WPCP) to implement a Grease Interceptor Inspection program and Commercial Food Preparation Site Education. A copy of the 2025 Pollution Minimization Report is attached as Appendix B.

3.1.1 Industrial Pretreatment Program
HMC Section 5-4.09 Pretreatment Facilities.

The City may require pretreatment facilities where necessary to prevent harmful industrial or commercial discharges from adversely affecting the sanitary sewer system or treatment operations. Required pretreatment facilities must be properly designed, installed, operated, and maintained by the discharger.

HMC Section 5-5.405 Pretreatment.

The City may regulate, monitor, and enforce pretreatment requirements for non ‑domestic users to protect wastewater collection and treatment facilities and ensure regulatory compliance.

Element 3
Legal Authority

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HMC Section 5-5.202 Federal Categorical Pretreatment Standards.

Industrial users must comply with effluent limitations, monitoring, reporting, and operational requirements established under the Clean Water Act and associated federal regulations.

3.1.2 Grease, Oil, and Sand Interceptors.

HMC Section 5-4.07 Grease, Oil, and Sand Interceptors.

The discharger shall be responsible for the installation and maintenance of grease, oil, and sand interceptors at facilities where wastewater could contain substances that may cause blockages or interfere with sewer operations. Interceptors must be accessible for inspection, cleaning, and maintenance and operated at the property owner’s expense.

3.2 COLLABORATION WITH STORM SEWER AGENCIES
HMC Section 5-8 Stormwater Management and Discharge Control.

The City has the authority to regulate stormwater discharges and prevent illicit connections or discharges to the sanitary sewer system, supporting coordination between wastewater and stormwater programs to protect public infrastructure and receiving waters.

Municipal Regional Stormwater Permit Order No. R2-2022-00181 The permit provides the regulatory framework for stormwater management and inter ‑agency coordination, supporting shared responsibilities for spill response, cross ‑connection prevention, and protection of surface waters.

3.3 DESIGN AND CONSTRUCTION STANDARDS
HMC Section 5-10 Testing, Inspection, Repair and Replacement of Building Sewers and Sewer Laterals.

The City may require testing, inspection, repair, or replacement of building sewers and sewer laterals to ensure proper function, prevent infiltration and inflow, and protect the public sewer system.

3.3.1 Wastewater Design Standards
City of Hercules Standard Plans, Design Standards, Standard Specifications Section 19.2 Sewer components and connections shall be designed according to the specifications.

1 https://www.waterboards.ca.gov/rwqcb2/board_decisions/adopted_orders/2022/R2-2022-0018.pdf, last accessed April 27, 2026.
2 https://www.herculesca.gov/government/engineering-public-works/standard-design-plans-specifications, last accessed April 27, 2026.

Element 3
Legal Authority

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3.4 SEWER ACCESS AUTHORITY
HMC Section 5-10.16 Right of Entry.

The City has the legal authority to enter public or private property at reasonable times for the purpose of inspecting, maintaining, repairing, or responding to emergencies involving sanitary sewer facilities.

3.4.1 Service Lateral Access
HMC Section 5-4.12 Right of Entry.

This provision authorizes City access to sewer service laterals where necessary to inspect, maintain, or repair infrastructure connected to the public sewer system.

3.5 ENFORCEMENT AUTHORITY
HMC Section 5-4.02, 5-5.201, 5-5.402
The City has the authority to regulate sewer systems, enforce sewer service requirements, recover costs, and take enforcement actions necessary to protect public health and infrastructure.

HMC Section 5-10.12 Notices to Correct Violations.

This section authorizes the City to issue notices requiring correction of sewer ordinance violations and establishes mechanisms for compliance and enforcement actions.

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ELEMENT 4
Operations and Maintenance Program
SWRCB Requirement (Order WQ 2022-0103-DWQ):

The Plan must include the items listed below that are appropriate and applicable to the Enrollee’s system.

4.1 Updated Map of Sanitary Sewer System: An up-to-date map(s) of the sanitary sewer system, and procedures for maintaining and providing State and Regional Water Board staff access to the map(s). The map(s) must show gravity line segments and manholes, pumping facilities, pressure pipes and valves, and applicable stormwater conveyance facilities within the sewer system service area boundaries.

4.2 Preventive Operation and Maintenance Activities: A scheduling system and a data collection system for preventive operation and maintenance activities conducted by staff and contractors. The data collection system must document data from system inspecti on and maintenance activities, including system areas/components prone to root-intrusion potentially resulting in system backup and/or failure.

4.3 Training In -house and external training provided on a regular basis for sanitary sewer system operations and maintenance staff and contractors.

4.4 Equipment Inventory An inventory of sewer system equipment, including the identification of critical replacement and spare parts.

4.1 MAP OF SANITARY SEWER SYSTEM
The City’s collection system consists of gravity sewer mains, force mains, and pump stations, as shown on Figure 4-1. An overview of the sewer system is provided in Element 1, Section 1.3.

The collection system includes approximately 62 miles of gravity sewer mains and 1,660 manholes, most of which were constructed after 1970. The City’s collection system includes six pump stations, and their associated 3.8 miles of force mains, including the Pinole-Hercules Water Pollution Control Plant (WPCP) effluent force main. The wastewater generated by the City is conveyed to and treated by the WPCP, located southwest of the City limits in the City of Pinole. The City's GIS was last comprehensively updated as part of the 2020 Sewer Collection System Master Plan Update. Since then, the City has been working to maintain current spatial data by incorporating updates on a project -by-project basis as system improvements are completed.

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Fig 4-1. Wastewater Collection System: N:\Clients\682 City of Hercules\60-26-11 2025 SSMP Update\GIS\PRO\Hercules SSMP Update.aprx - ggrgich - 4/28/2026 Element 4
Operations and Maintenance Program

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4.2 PREVENTATIVE OPERATION & MAINTENANCE ACTIVITIES
The elements of the City’s sewer system O&M program include:
• Proactive, preventive, and corrective maintenance of gravity sewers, lift stations, and force mains;
• Closed circuit television (CCTV) inspection program to determine the condition of the gravity sewers;
• Rehabilitation and replacement of sewers and lift stations that have been identified to be in poor condition through the Collection System Master Plan update and subsequent CCTV efforts.

4.2.1 Pipelines
The city has historically maintained a seven -year hydro -flushing cycle for all sewer mainlines. Areas identified through historical records, maintenance experience, and inspections as requiring additional preventive maintenance are referred to as hot spots and are documented in Appendix C. Hot spots are locations prone to recurring blockages caused by FOG deposition, root intrusion, or structural defects such as line sags. These areas are inspected at minimum every six months and cleaned on a quarterly basis by the City's maintenance contr actor, H&R Plumbing, with additional cleaning performed on an as-needed basis.

4.2.1.1 Pipeline Inspection
The City utilizes contractors to perform CCTV inspection of the collection system. In 2018, a comprehensive system-wide inspection established a complete baseline condition assessment. Findings from this inspection inform ongoing mainline and lateral repair prioritization. Subsequent inspections will be conducted on a targeted, as-needed basis.

4.2.1.2 Manhole Inspection
The City plans to implement a City -wide program to address manhole inflow and infiltration (I/I) in the future. Manholes will be sealed to reduce the amount of inflow and infiltration coming into the sewer system.

4.2.2 Pumping/Lift Stations
Pump stations are visited and visually inspected daily for satisfactory operation. More detailed quarterly inspections are performed on each lift station to ensure operational efficiency, perform preventive maintenance, and conduct repairs as needed. Lift station wet wells are also cleaned as part of the City’s quarterly inspections by City staff and under contract with a local contractor, Andre’s Mechanical & General Engineering, Inc. The Victoria lift station is inspected and cleaned on a bi-monthly schedule.

Operations staff conduct quarterly training on emergency bypass pumping and generator power at all lift stations. The City is in the process of developing standard operating procedures (SOPs) for bypass pumping at each lift station and ensuring that necessary parts and equipment are maintained on hand to support emergency response operations.

Element 4
Operations and Maintenance Program

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4.2.3 Force Mains
The City inspects force mains on an as -needed basis informed by maintenance history and observed system performance. Two force main failures have previously occurred at the Bayside and Willow pump stations in 2011, and 2019, both at the connection point to the wet wells due to rigid connections. Repairs were completed using repair clamps and concrete encasement at the affected connection points. No further issues have been identified at these locations.

4.3 TRAINING
The City uses a combination of tailgate meetings and on -the-job training. Though documentation is minimal, training is conducted regularly. Training topics typically include the following:
• Spill Emergency Response (see Element 6 for details on detailed spill response training) • Pump Station O&M
• Safety
• Traffic Safety
• CPR
• Hazmat
Training events are not currently logged, but the development of a tracking log is planned in the future, as the required staffing resources become available.

4.4 EQUIPMENT INVENTORY
The City owns two (2) trailer -mounted diesel pumps that can be dispatched with pickup trucks and employed by maintenance crews as necessary for bypass pumping applications. The City has developed an inventory of major equipment and critical replacement parts that is included in Appendix D. As part of the SERP, the City uses local vendors to provide emergency equipment to supplement the City’s inventory on an as-needed basis.

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ELEMENT 5
Design and Performance Provisions
SWRCB Requirement (Order WQ 2022-0103-DWQ):

The Plan must include the following items as appropriate and applicable to the Enrollee’s system.

5.1 Updated design criteria, and construction standards and specifications, for the construction, installation, repair, and rehabilitation of existing and proposed system infrastructure components, including but not limited to pipelines, pump stations, and other system appurtenances.

5.2 Procedures, and standards for the inspection and testing of newly constructed, newly , installed, repaired, and rehabilitated system pipelines, pumps, and other equipment and appurtenances.

5.1 UPDATED DESIGN CRITERIA
The Public Works Department administers the City’s Sanitary Sewer Design Standards, Standard Plans, and Standard Specifications (City Standards) for sewer mainlines, structures and appurtenances like maintenance holes, lift stations, and service laterals. The City Standards were last updated in 2002.

5.1.1 Wastewater Design Standards
Under the City’s Design Standards (Section 19 – Sanitary Sewers), the City adopted the Central Contra Costa Sanitary District Standard Specifications for Design & Construction (Central San Standards), which were last updated in 2022.

The complete version of the City Standards is located on the City's website at https://www.herculesca.gov/government/engineering-public-works/standard-design-plans-specifications. The complete version of Central San Standards is located on Central San website at https://www.centralsan.org/standard-specifications. The referenced Central San Standards provide for both new construction and rehabilitation and repair of all main lines sewers, trunk sewers, manholes and other collection system appurtenances.

5.1.2 Sanitary Sewer Construction Specifications
Construction standards for sanitary sewers can be found in standard specifications linked above.

5.1.3 Lift Stations
Lift stations standards are not included in the design standards but are handled on a case -by-case basis.

The City requires that all new or rehabilitated lift stations be designed by an appropriately experienced engineer and approved by the City before construction and acceptance by the City Council.

5.1.4 Private Sewer Systems and Private Laterals
All new and rehabilitated private sewers and laterals must adhere to the standard specifications linked above. Certification of private sewer laterals is conducted by the City as described in section 1.3.1.

Element 5
Design and Performance Provisions

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5.2 PROCEDURES AND STANDARDS
All newly constructed sewer mains and appurtenances are required be cleaned, tested, and inspected in accordance with the City Standards (Central San Standards Section 33 01 30.11 ) prior to acceptance.

Required acceptance procedures include Closed‑Circuit Television (CCTV) inspection after installation and backfilling to verify alignment, grade, and structural condition, and leakage testing to demonstrate pipeline integrity. Leakage testing shall be performed using low ‑pressure air testing or hydrostatic (infiltration/exfiltration) testing, as applicable to pipe size and material, with all deficiencies corrected prior to final acceptance.

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ELEMENT 6
Spill Emergency Response Plan
SWRCB Requirement (Order WQ 2022-0103-DWQ):

The Plan must include an up-to-date Spill Emergency Response Plan to ensure prompt detection and response to spills to reduce spill volumes and collect information for prevention of future spills.

The Spill Emergency Response Plan must include procedures to:

1. Notify primary responders, local officials, and regulatory agencies of spills in a timely manner.

2. Notify potentially affected entities (e.g., health agencies, water suppliers) of spills impacting public health or State waters.

3. Comply with notification, monitoring, and reporting requirements of the General Order, State law, and Regional Water Board Orders.

4. Ensure trained staff and contractors implement the Spill Emergency Response Plan.

5. Address emergency operations, traffic control, and other necessary response actions.

6. Contain spills and prevent or minimize discharge to State waters or drainage systems.

7. Minimize and remediate public health impacts and impacts to beneficial uses of waters.

8. Remove sewage from drainage systems.

9. Clean impacted areas and drainage systems without harming beneficial uses.

10. Use appropriate technologies, practices, and equipment to support containment and recovery.

11. Coordinate with storm drain and utility agencies before, during, and after spill events.

12. Conduct post-spill assessments of response activities.

13. Document and report spills as required by the General Order.

14. Annually review and update the Spill Emergency Response Plan to ensure effectiveness

6.1 NOTIFICATION, MONITORING, AND REPORTING PROCEDURES
The Spill Emergency Response Plan ( SERP) outlines the required notification, monitoring, and reporting procedures for all spills or sanitary sewer spills (Spills), consistent with the WDR. The full SERP document is included as Appendix E. Spill notifications and reporting actions are determined based on the spill Category, defined in Element 1.1.1 Spill Definition.

The City has designated a LRO in accordance with the order. The LRO is responsible for ensuring that:
• All required spill notifications are made promptly
• All required data and documentation (e.g., volume estimates, response actions, photos) are submitted within WDR deadlines
• Final certified reports are submitted through CIWQS in accordance with the timelines established in Attachment E of the WDR
• Reporting spills to the SWRCB, RWQCB, OES and Health Department as necessary.

Element 6
Spill Emergency Response Plan (SERP)

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6.1.1 Contacts for Notification Purposes
In case of Category 1 Spills, the City must contact the relevant organizations provided below.

San Francisco Bay Region Water Quality Control Board (RWQCB) or Local RWQCB (510) 622-2300 (8 a.m. – 5 p.m.)
(510) 286-1255 (Voicemail)
Fax: (510) 622-2460
Email: [email protected]
Contra Costa County Health Department
(925) 608-5500
Urban Creeks Council of California
(510) 540-6669
Fax (510) 848-2219
Local Agencies and Individuals:

Fire Department (510) 799-4575 Protect Public Health
Police Department (510) 724-1111 Road Block, Traffic Control, etc.

Public Works (510) 799-8200 Close areas such as beach, parks, fishing pier, etc.

Water District (866) 403-2683 Impact on drinking water storage or supply.

When City staff determines that a Spill is occurring or has occurred, the staff person will contact their supervisor to report the occurrence. The City will contact the relevant organizations as the situation dictates and report the Spill as soon as possible. The City will also contact any local residents or businesses who may be impacted.

6.2 SPILL RESPONSE PROCEDURES
The City has established procedures for prompt and effective response to all spills. These procedures are documented in the SERP and a flow chart illustrating the standard procedures for reporting Spills is provided on Figure 2-2.

6.3 TRAINING
All staff that respond to spills are required to complete structured training activities. These include orientation sessions, hands-on spill response simulations, and regular updates tied to lessons learned and operational changes. Specific training for staff includes the following components:
• Orientation: All new staff with spill response responsibilities must complete a spill response orientation within six (6) months of hire. This includes review of the SERP, notification procedures, health and safety protocols, spill response SOPs, and documentation requirements.
• Annual Refresher Training: All spill response staff are required to attend a refresher course each calendar year.

Element 6
Spill Emergency Response Plan (SERP)

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• Tabletop Exercise (Annually): This discussion-based drill simulates a potential spill event and focuses on:
— Chain of command and communication
— Decision-making protocols
— Interdepartmental coordination
— Environmental protection considerations
• Functional Full-Scale Exercise (Annually): This field-based drill simulates a large-scale spill and includes:
— Deployment of sewer response equipment (vactor trucks, pumps, containment tools) — Real-time coordination between responding crews
— Communication and safety protocol testing
— Confined space entry and live manhole entry are not conducted. Each drill concludes with a structured debrief and critique to capture lessons learned and inform updates to the SERP.

Training activities are documented in the City’s official training records and are evaluated annually by the Utilities Superintendent and Compliance Manager to ensure effectiveness and completeness.

6.3.1 Contractor Training
All contractors performing work on or near the City’s wastewater collection system are required to receive the City’s sanitary sewer policies and spill response procedures, confirm that their personnel have been trained on these procedures prior to beginni ng work, and follow the City’s SERP protocols in the event of a spill.

6.4 COORDINATION
The City maintains established coordination protocols with internal departments and external agencies to ensure unified, effective response during spill events.

City staff participate in emergency response coordination activities including tabletop exercises, cross - agency planning meetings, and training courses offered by CWEA and other wastewater -related organizations. Staff also receive First Responder and HazWO PER training, which includes SOPs for emergency events.

Coordination with other City departments , including stormwater, traffic control, and public health , is pre-established and activated as needed during large or high -risk spill events. These joint response protocols are reviewed and updated annually to ensure operational readiness and regulatory compliance.

Element 6
Spill Emergency Response Plan (SERP)

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6.5 DOCUMENTATION AND REVIEW
The City documents all spill events using standardized forms and procedures established in the SERP, provided in Appendix E. These include:
• The Sanitary Sewer Spill Field Data Sheet (see SERP)
• Work orders
• Photographic documentation (before and after cleanup) • Volume and flow rate estimates
• Contact logs for regulatory notifications
• Final reports submitted through CIWQS
All records are compiled into the City’s files, which is maintained and accessible for regulatory review and audit purposes.

The LRO is responsible for ensuring that each spill event is reviewed and documented completely and accurately. CIWQS submittals are completed in accordance with the timelines and content requirements set forth in the WDR.

6.5.1 Program Review and Continuous Improvement
The City is actively evaluating and modifying its SERP to ensure alignment with City standards and WDR requirements. Lessons learned from spill events are documented, reviewed, and incorporated into SERP updates including any adjustment needed to training protocols.

At a minimum annually, the Public Works Superintendent leads a formal review of the SERP to assess operational effectiveness and integrate any changes in procedures. Revisions made to the SERP are tracked by revision date, version-controlled, and distributed to all field staff to ensure protocols are followed.

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ELEMENT 7
Sewer Pipe Blockage Control Program
SWRCB Requirement (Order WQ 2022-0103-DWQ):

The Plan must include procedures for the evaluation of the Enrollee’s service area to determine whether a sewer pipe blockage control program is needed to control fats, oils, grease, rags and debris. The procedures must include, at minimum:
• An implementation plan and schedule for a public education and outreach program that promotes proper disposal of pipe-blocking substances;
• A plan and schedule for the disposal of pipe-blocking substances generated within the sanitary sewer system service area. This may include a list of acceptable disposal facilities and/or additional facilities needed to adequately dispose of substances generated within a sanitary sewer system service area;
• The legal authority to prohibit discharges to the system and identify measures to prevent spills and blockages;
• Requirements to install grease removal devices (such as traps or interceptors), design standards for the removal devices, maintenance requirements, best management practices requirements, recordkeeping and reporting requirements; • Authority to inspect grease producing facilities, enforcement authorities, and whether the Enrollee has sufficient staff to inspect and enforce the fats, oils, and grease ordinance; • An identification of sanitary sewer system sections subject to fats, oils, and grease blockages and establishment of a cleaning schedule for each section; and • Implementation of source control measures for all sources of fats, oils, and grease reaching the sanitary sewer system for each section identified above

7.1 PUBLIC EDUCATION AND OUTREACH PLAN
The City shares information with the public about its sanitary sewer services on its website:
https://www.herculesca.gov/government/engineering-public-works/sanitary-sewer. The website includes information about sewer backups and provides a link to the Association of Bay Area Governments’ Be Sewer Smart Program3 to educate the public on how backflows can be prevented. The City also provides contact information in the event that sewer backups occur.

Furthermore, the City is a partner agency in the Contra Costa Clean Water Program, a program in the County under which municipalities collaborate to control sources of pollutants that enter the stormwater system, including sanitary sewer. The Contra Costa Clean Water Program develops and distributes the outreach materials provided in Appendix F to Food Service Establishments (FSE) through their website at https://cccleanwater.org/wp-content/uploads/2024/04/FoodService.pdf.

As part of its Pollution Minimization Program, the City's Water Pollution Control Plant (WPCP) also provides education to commercial food preparation sites, offering targeted outreach to businesses that represent a significant source of fats, oils, and grease (FOG) in the collection system.

3 https://www.besewersmart.com/, last accessed April 27, 2026.

Element 7
Sewer Pipe Blockage Control Program

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7.2 DISPOSAL PLAN
The City is currently managing its FOG by requiring grease, oil, and sand interceptors where the PW Superintendent deems they are necessary. The City Municipal Code requires the discharger to maintain the interceptor in a continually efficient operation. To support compliance, the City's Water Pollution Control Plant conducts grease interceptor inspections to verify that interceptors are being properly maintained and operating as intended.

7.3 LEGAL AUTHORITY
The HMC provides the legal basis and authority to prohibit discharges to the system and identifies measures to prevent S pills and blockages caused by FOG. The City’s current Code is posted at:
https://www.herculesca.gov/government/city-clerk/municipal-code. The following sections provide specific provisions associated with measures to prevent Spills and blockages:
• HMC Section 5-4.06 Prohibited Wastes
• HMC Section 5-4.07 Grease, Oil, and Sand Interceptors • HMC Section 5-4.08 Wastes Requiring City Approval
• HMC Section 5-4.09 Pretreatment Facilities
• HMC Section 5-4.11 Measurements, Tests, and Analyses
• HMC Section 5-4.14 Accidental Discharges

7.3.1 Prohibition of Discharges
Section 5 -4.06 prohibits discharging certain materials into its sanitary sewer system, including petroleum products; flammable or explosive substances; unshredded garbage; solids or viscous materials that may obstruct flow or interfere with treatment opera tions; corrosive wastes with pH below 6.0 or above 9.0; mercury or mercury compounds; noxious or foul -smelling substances that create a nuisance; wastes from septic tanks; stormwater and uncontaminated surface or cooling waters; and any wastes that cannot be properly treated or that would cause the treatment plant to violate state or regulatory discharge requirements.

7.3.2 Inspection and Enforcement Authority
Section 5 -4.11 details testing methodology and states that w hen required by the City, industrial dischargers must provide proof , such as records from waste disposal services , that they are preventing prohibited discharges and complying with the applicable regulations. In addition, the Pinole Valley Water Pollution Control Plant performs pretreatment inspections of industrial sites to verify compliance with discharge requirements and identify potential sources of prohibited discharges entering the collection system.

7.4 GREASE REMOVAL DEVICES, BMPS, AND REPORTING
Section 5-4.07 requires grease, oil, and sand interceptors to be installed by the waste discharger when the PW Superintendent determines they are necessary to properly handle wastewater containing excessive grease, flammable substances, sand, or other harmful materials.

Element 7
Sewer Pipe Blockage Control Program

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The City references the Central San Design Standards for grease, oil, and sand interceptors, which is available at https://www.centralsan.org/standard -specifications . The City also participates in the Contra Costa Clean Water Program, which works with FSEs to convey standards, BMPs, maintenance and recordkeeping requirements. To support ongoing compliance, the City's Water Pollution Control Plant conducts grease interceptor inspections to verify that interceptors are being properly maintained and operating as intended.

7.5 HOT SPOT IDENTIFICATION AND CLEANING SCHEDULE
The City’s Hot Spot program is focused on problematic areas, many of which are FOG related. Hot spots are checked at minimum every 6 months. Identified Hot Spots are included in Appendix C.

7.6 SOURCE CONTROL MEASURES
HMC Chapter 4 and the City Standards provide City staff the authority to implement source control measures. HMC Section 5-4.12 provides the PW Superintendent and authorized City staff to inspect and observe properties to ensure that the requirements of the HMC and the City standards are followed. HMC Title 1 Chapter 4 includes penalty provisions for violations. In addition, the Pinole Valley Water Pollution Control Plant performs pretreatment inspections of industrial sites to verify compliance with discharge requirements and identify potential sources of prohibited discharges entering the collection system.

Source control measures for FSEs are provided through the City’s participation in the Contra Costa Clean Water Program. An opportunity remains for FOG outreach in residential areas.

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ELEMENT 8
System Evaluation, Capacity Assurance and Capital Improvements SWRCB Requirement (Order WQ 2022-0103-DWQ):

The Plan must include procedures and activities for routine evaluation and assessment of system conditions; capacity assessment and design criteria; prioritization of corrective actions; and a capital improvement plan.

8.1 System Evaluation and Condition Assessment, including procedures to:
• Evaluate the sanitary sewer system assets utilizing the best practices and technologies available; • Identify and justify the amount (percentage) of its system for its condition to be assessed each year;
• Prioritize areas of the system for condition assessment; • Assess the system conditions using visual observations, video surveillance and/or other comparable system inspection methods;
• Utilize observations/evidence of system conditions that may contribute to exiting of sewage from the system which can reasonably be expected to discharge into a water of the State; • Maintain documents and recordkeeping of system evaluation and condition assessment inspections and activities; and
• Identify system assets vulnerable to direct and indirect impacts of climate change.

8.2 Capacity Assessment and Design Criteria, including procedures to identify system components that are experiencing or contributing to spills caused by hydraulic deficiency and/or limited capacity.

8.3 Prioritization of Corrective Action based on findings of the condition assessments and capacity assessments must be used to prioritize corrective actions. Prioritization must consider the severity of the consequences of potential spills.

8.4 Capital Improvement Plan including:
• Project schedules including completion dates for all portions of the capital improvement program;
• Internal and external project funding sources for each project; and • Joint coordination between operation and maintenance staff, and engineering staff/consultants during planning, design, and construction of capital improvement projects; and Interagency coordination with other impacted utility agencies.

8.1 SYSTEM EVALUATION AND CONDITION ASSESSMENT
CCTV inspection and supplemental data are used to identify and prioritize maintenance and rehabilitation needs. The City conducted a comprehensive system-wide cleaning and CCTV inspection that concluded in 2018, establishing a baseline condition assessment of the entire sewer collection system. The City conducts condition assessments on a targeted, as-needed basis, prioritizing pipe segments based on spill history, maintenance frequency, known problem areas, and proximity to surface waters or environmentally sensitive areas. A targeted CCTV inspection program is budgeted in the 2026/27 fiscal year as part of the Condition Assessment Project, which will build on the 2018 baseline and further inform rehabilitation and maintenance priorities going forward.

Element 8
System Evaluation, Capacity Assurance,
and Capital Improvements

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Additionally, CCTV inspection of the Willow -Newbury sewer rehabilitation was completed in Fall 2025 (6,400 LF) and warranty inspection of the Lower Sycamore trunk main is expected to be completed by the end of June 2026.

To support long -term capacity planning and system evaluation, the City contracted with West Yost to complete the Sewer Collection System Master Plan Update in April 2020 (2020 Master Plan Update). As part of that effort, an Innovyze InfoSewer model was developed to evaluate capacity and allow long-term management of the collection system. In 2024, a portion of the InfoSewer model was recalibrated using updated flow monitoring data collected in January and February 2024 and the model was recalibrated in 2025 to reflect the completion of the Lower Sycamore trunk main project.

Climate change may result in increased frequency of power disruptions, which could impact the City’s lift station operations. Each lift station is equipped with a portable generator connection to maintain operations during power outage events.

Condition Assessment Program
Details of the City’s condition assessment program are included in Element 4.

As part of its annual Condition Assessment Project, the City funds ongoing condition assessment for its wastewater collection system. Funded activities include:
• CCTV inspections
• Smoke testing
• Flow monitoring
• Lift station studies
• Physical inspections to evaluate asset condition and system performance Data collected through the Condition Assessment Project are used to identify system deficiencies, prioritize repairs, and refine future CIP projects.

8.2 CAPACITY ASSESSMENT AND DESIGN CRITERIA
The City uses a combination of hydraulic modeling, flow monitoring, design standards, and spill history to evaluate and maintain adequate system capacity. This section describes the methodologies and criteria used to assess the City’s ability to convey both dry weather and wet weather flows without spills caused by hydraulic deficiencies.

The collection system should be sized to handle wet weather flows, which include rainfall dependent infiltration and inflow of rainwater and groundwater in addition to the dry weather base flow. By buildout, the City’s wastewater peaking factors are expected to increase during both average dry weather flow and peak wet weather flow. Climate change may increase system demands by intensifying the frequency and magnitude of storms, potentially increasing infiltration and inflow (I/I), increasing erosive forces around pipelines located in vulnerable areas including canyons and creek crossings, and placing the collection system under additional strain. The 2020 Master Plan Update identified portions of the collection system which may be vulnerable to these impacts. The affected facilities are summarized below and shown on Figure 8-1. • Refugio Valley Road Gravity Main: Identified as deficient under existing conditions. This isolated gravity main is recommended to be monitored during major wet weather events.

Element 8
System Evaluation, Capacity Assurance,
and Capital Improvements

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• Refugio Creek Crossing Gravity Main: Identified as deficient under future conditions. A large amount of development is planned upstream of this gravity main. The 2020 Master Plan recommended that the City perform flow monitoring as development milestones are achieved to confirm sufficient capacity is available.

8.2.1 Hydraulic Deficiency and Spill Risk Identification The City identifies system components at risk of causing spills through analysis of:
• Historical spill data
• System inspection and condition assessment records
• Flow monitoring
• Hydraulic modeling evaluations (InfoSewer)
• Areas with known I/I
The City has completed the following planning studies to support hydraulic capacity assessment:
• Lower Sycamore Analysis (West Yost, September 2025)
• Sycamore Avenue Sewer Hydraulic Evaluation (West Yost, July 2024) • Sewer Collection System Master Plan Update (West Yost, April 2020) • CCTV Review of Highway 5, Willow Avenue, and Interstate 80 (West Yost, April 2019) • Sewer Collection System Master Plan (Dudek, August 2008) All of the City’s lift stations have a minimum of two pumps to provide redundancy in the event of a single pump outage. The City also maintains one backup pump for five of its six lift stations; four of the backup pumps are stored on-site at their respective lift stations.

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Figure 8-1
CIP Projects and Other
Recommendations Overview
City of Hercules
Sewer System
Master Plan
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Element 8
System Evaluation, Capacity Assurance,
and Capital Improvements

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8.3 PRIORITIZATION OF CORRECTIVE ACTION
Corrective actions are prioritized based on the findings of the system’s condition and capacity assessments. Projects are ranked according to:
• Severity of existing or predicted surcharge or overflow risk • Environmental and public health impact if a failure occurs • Location in high-risk or environmentally sensitive areas

8.4 CAPITAL IMPROVEMENT PLAN
Based on completed studies, the following capacity -related Capital Improvement Projects (CIPs) were recommended as summarized in Table 8-1.

Table 8-1. Capacity-Related Capital Improvement Projects Pipeline Location/Project Project Description Approximate Length, LF Project Status
2008 Master Plan(a)
Sycamore Ave to Railroad Ave
Trunk Main Replace 33-inch gravity main 8,300 Deferred and completed 2020
Sycamore Ave to Partridge Dr
Trunk Main Replace 24-inch gravity main 4,700 Deferred and completed 2020
Bristol St Near Willow Lift Station Replace 8-inch gravity main 500 Deferred 2020 Master Plan Update(b)
San Francisco Bay Trail and
Sycamore Ave (Lower Trunk Main)
Upsize 24-inch gravity main to
30-inch gravity main 4,300 Completed
Sycamore Ave (Upper Trunk Main)
Upsize 20-inch gravity main to
24-inch gravity main 1,500 Deferred
Upsize 20- and 24-inch gravity
main to 27-inch gravity main 2,000 Deferred
Abandonment of Promenade Lift
Station
Decommission Promenade Lift
Station and install 12-inch
diameter gravity main
1,200 Deferred
(a) Dudek. August 2008. City of Hercules Sewer Collection System Master Plan. (b) West Yost. April 2020. Hercules Collection System Master Plan Update.

8.4.1 Rehabilitation Program
In addition to the capacity -related recommendations, the City has developed a sewer repair, rehabilitation, and replacement program based on:

Maintenance hotspots identified by operations staff.

Hydraulic analysis of the system under existing and future design flows.

8.4.2 Current CIP
The City’s current wastewater CIP, covering fiscal year (FY) 2025 -26 through FY 2034 -35, is provided in Table 8-2.

Element 8
System Evaluation, Capacity Assurance,
and Capital Improvements

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Table 8-2. Ten-Year Sewer Capital Improvement Plan
Project FY 2026-27 FY 2027-28 FY 2028-29 FY 2029-30 FY 2030-31 FY 2031-32 FY 2032-33 FY 2033-34 FY 2034-35 FY 2035-36 Sewer Fund 421
Willow-Newbury
Sewer
Rehabilitation
$269,700 $1,206,100 $1,080,000 – – – – – – –
Lower Sycamore
Ave Sanitary Sewer
Overflow Pipeline
– – – – $151,700 $1,650,000 – – – –
Sycamore Ave
Upper Trunk Main – – – – – – – $50,000 $1,241,800 –
Promenade Lift
Station – – $450,463 $2,928,008 $2,928,008 – – – – –
Condition
Assessment
Projects
$175,000 $175,000 $100,000 $100,000 $100,000 $100,000 $100,000 $100,000 $100,000 $100,000 Annual Sewer
System
Improvements
– $100,000 $300,000 $300,000 $300,000 $300,000 $300,000 $300,000 $300,000 $300,000 Total $444,700 $1,481,100 $1,930,463 $3,328,008 $3,479,708 $2,050,000 $400,000 $450,000 $1,641,800 $400,000 Source: 10 Year Capital Improvement Plan – Sewers Fiscal Years 2026-27 through 2035-36 excel document shared 3/19/2026 Element 8
System Evaluation, Capacity Assurance,
and Capital Improvements

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8.4.3 Coordination and Funding
The City coordinates planning, design, and construction of CIP projects through a joint review process between operations, engineering staff, and external engineering consultants. External coordination occurs as needed with agencies impacted by projects (i.e., CalTrans, PG&E, and railroad companies).

Projects are sequenced based on ongoing projects, requests from the community and City Council, active grant application funding, regulatory requirements, and relevant condition assessments. 4 The primary source of capital funding is the City’s Capital Projects Sewer Enterprise Fund, which receives financing from sewer connection charges and can be “used only for the acquisition, construction, reconstruction, completion and improvement of the s anitary sewer system”. 5 The City of Hercules’ sewer rates were revised in July 2025 for the five-year period covering fiscal years (FY) 2025-26 through FY 2029-30. Typical funding may be supplemented with grants and special or enterprise funds when available.4

4 City of Hercules. June 2025. Fiscal Year 2025-2026 Annual Budget. https://hercules.legistar.com/MeetingDetail.aspx?ID=1309439&GUID=F801E9FC-69BD-4CB6-9B1E- F30C57095061&Options=info|&Search=
5 City of Hercules. Municipal Code 2025-03-25, Title 5 Sanitation and Health, Chapter 4 Sanitary Sewers, Section 5-4.15. https://ecode360.com/47762039#47762090

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ELEMENT 9
Monitoring, Measurement, and Program Modifications
SWRCB Requirement (Order WQ 2022-0103-DWQ):

The Plan must include an Adaptive Management section that addresses Plan implementation effectiveness and the steps for necessary Plan improvement, including:
• Maintaining relevant information, including audit findings, to establish and prioritize appropriate Plan activities;
• Monitoring the implementation and measuring the effectiveness of each Plan Element; • Assessing the success of the preventive operation and maintenance activities; • Updating Plan procedures and activities, as appropriate, based on results of monitoring and performance evaluations; and
• Identifying and illustrating spill trends, including spill frequency, locations and estimated volumes.

This element addresses the requirements outlined in Element 9 of the State Water Resource Control Board’s Waste Discharge Requirements for Sanitary Sewer Systems, as applicable to the City’s system.

9.1 OVERVIEW
The City monitors the effectiveness of its SSMP, evaluates key performance indicators, and implements modifications as needed to support continuous improvement of the sewer system management program.

In general, the City’s adaptive management consists of the following:
• Maintaining up-to-date and relevant information
• Monitoring implementation and measuring effectiveness of SSMP elements • Evaluating the effectiveness of the preventive maintenance program • Identifying and analyzing spill trends
• Updating procedures and resources based on performance

9.2 MAINTAINING RELEVANT INFORMATION
The City archives audit findings, spill data, inspection reports, technical studies, customer requests, and other source data. Operations and maintenance records, including work orders and equipment logs, are maintained internally and can be made available to State and Regional Water Board staff upon request.

9.3 SSMP EFFECTIVENESS
The City evaluates the effectiveness of its SSMP elements through a combination of internal audits and performance metric analysis. Performance metrics are tracked and reviewed by management on a regular basis to identify spill trends, measure progress aga inst targets, and guide program adjustments. As part of the 2024 SSMP Audit, the City incorporated an evaluation of effectiveness at the conclusion of each SSMP element to assess whether each element was functioning as intended and achieved its stated objective. Where compliance gaps or improvement opportunities were identified, recommendations were made and have been incorporated into the 2025 SSMP update.

Element 9
Monitoring, Measurement, and Program Modifications

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9.4 KEY PERFORMANCE METRICS
The indicators the City will use to measure the performance of its wastewater collection system and the effectiveness of its SSMP are:
• Total number of Spills per year
• Spill Rate (number per 100 miles per year)
• Number of Spills by cause (roots, grease, debris, structural failure, capacity, lift station failures, and other)
The City is also considering implementing the following key performance metrics in the future:
• Tracking completion of hot spot cleaning at site appropriate frequencies • Tracking reliability of communications systems at all facilities, including planned improvements to SCADA coverage and installation of additional Smart Cover manhole monitoring units.
• Monitoring Capacity Performance of Gravity mains identified as deficient in the 2020 Master Plan Update, as follows:
— Mains deficient under existing peak wet weather flows: Monitor system response during major wet weather events to identify surcharging or overflow conditions — Mains projected to be deficient in the future: Monitor as upstream development projects come online and begin discharging to the collection system.

9.5 SPILL TREND METRIC RESULTS
This section presents the results of three key spill trend performance metrics for the last 10 years (2014 to 2024). These metrics include the total number of spills per year, the total volume and location of spills, and the spill rate normalized by system size.

9.5.1 Total Number of Spills per Year
Figure 9-1 presents the trend in total number of spills per year by spill category. Since 2014, spills have generally remained low, with two spills per year during 2014, 2019, and 2022 marking the highest annual number in this period. The City has not experienced a Category 1 spill since 2022.

The City has experienced nine spills since 2014. Failures were reported at the following locations:
• Manhole (four spills)
• Lift station (two spills)
• Gravity main (three spills)
Element 9
Monitoring, Measurement, and Program Modifications

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Figure 9-1. Number of Spills per Year

9.5.2 Total Volume of Spills per Year
Table 9-1 presents the annual spill volume for the City's sewer collection system over the past ten years (2014-2024). Overall, the City has maintained a strong spill prevention record, with no reported spills in 2015, 2016, 2018, or from 2022 through 2024. A Category 3 spill occurred in March of 2026 and is documented separately in CIWQS.

Element 9
Monitoring, Measurement, and Program Modifications

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Table 9-1. Total Volume of Spills per Year
Year Total Volume Spilled, gallons
2014 1,150
2015 -
2016 -
2017 3,000
2018 -
2019 1,500
2020 2,000
2021 500
2022 550
2023 -
2024 -
Source: California State Water Resources Control Board Sanitary Sewer System Data. https://www.waterboards.ca.gov/water_issues/programs/sso/docs/index.php

9.5.3 Spill Rate
Figure 9-2 presents the City’s spill rate per 100 miles of gravity main. From the past ten years (2014-2024), the City average is 1.32, significantly lower than the Region 2 average of 3.86 over the same period. For 2024, the City’s average rate was 0.00, below the Region 2 average rate of 1.53 S pills per 100 miles of gravity main (Fiscal Year 2024-2025).6 The Spill rate per 100 miles of gravity main has remained relatively unchanged because the length of gravity mains has not changed significantly and the number of Spills per year is low.

6 California State Water Resources Control Board. August 2025. California Water Boards’ Annual Performance Report – Fiscal Year 2024-25.
https://www.waterboards.ca.gov/about_us/performance_report_2324/plan_assess/124_sanitary_sewage_overflow.html Element 9
Monitoring, Measurement, and Program Modifications

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Figure 9-2. Spills per 100 Miles of Gravity Main

9.6 PREVENTIVE MAINTENANCE PROGRAM METRIC RESULTS
Performance metric results related to preventive maintenance for the last five years (2020 -2024) are included in Table 9-2.

Element 9
Monitoring, Measurement, and Program Modifications

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Table 9-2. Preventive Maintenance Performance Metric Results (2020-2024) Performance Measure 2020 2021 2022 2023 2024
5-Year
Average
5-Year
Total
Total Number of Spills
per Year 1 1 2 0 0 0.8 4
Spill Rate (number per
100 miles per year) 1.61 1.61 3.23 0 0 1.29 –
Number of Spills by Cause
Roots 0 0 0 0 0 0.0 0
Grease 1 0 1 0 0 0.4 2
Debris 0 1 0 0 0 0.2 1
Structural Failure 0 0 0 0 0 0.0 0
Capacity 0 0 0 0 0 0.0 0
Lift Station Failure 0 0 1 0 0 0.2 1
Other 0 0 0 0 0 0.0 0
Source: California State Water Resources Control Board Sanitary Sewer System Data. https://www.waterboards.ca.gov/water_issues/programs/sso/docs/index.php

9.7 PROGRAM MODIFICATIONS
The City uses performance data, audit findings, and operational observations to make informed updates to SSMP elements, procedures, and practices. These actions may include procedural changes, capital improvements, maintenance or operational adjustments, s taffing changes, or updates to training and response plans. Examples of recent or planned program modifications include:
• Revision of the City’s GIS data, including verification of the accuracy of existing data and performing routine updates when inspections are performed or new data are available. • Improvement of staff training programs, i.e., operations staff may obtain California Water Environment Association (CWEA) Mechanical Technologist and/or Collection System Maintenance certification. Encourage staff to maintain certifications and advance to higher grade levels.
• Development of bypass standard operating procedures for each lift station. Verify that needed parts are available at each lift station. Implement a bypass training program for operations staff with regular rehearsals.
• Improvement of preventive maintenance program, including central tracking of maintenance records and pump and generator run-time hours. • Development of an updated ten-year CIP (2026-2036), including new and existing sewer infrastructure.7

7 City of Hercules. Adopted by City Council on June 24, 2025. Professional Services Agreement with SNG & Associates, Inc. to provide On-Call Engineering Staff Support Services and Preparation of the 10-Year Capital Improvement Program.

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ELEMENT 10
Internal Audits
SWRCB Requirement (Order WQ 2022-0103-DWQ):

The Enrollee shall conduct an internal audit, appropriate to the size and performance of the system, of its SSMP and the implementation of the Plan at a minimum frequency of once every three years.

This element addresses the requirements outlined in Element 10 of the State Water Resources Control Board’s Waste Discharge Requirements for Sanitary Sewer Systems, as applicable to City’s system.

10.1 OVERVIEW
The City conducts internal audit s of its SSMP to evaluate the effectiveness of program implementation, verify compliance with Order, and evaluate the City’s performance in preventing spills and addressing operational needs.

10.2 AUDIT SCOPE AND PROCESS
Each audit includes the following minimum components:
• Evaluation of the implementation and effectiveness of SSMP programs and procedures in preventing spills;
• Assessment of compliance with the General Order;
• Identification of deficiencies in the SSMP related to ongoing or recurring spills and discharges; • Determination of whether modifications to the SSMP are required to improve performance and address deficiencies.

Internal audits are led by the Public Works Superintendent who are familiar with the SSMP and its implementation. The audit team may include external consultants, operations staff, engineers, and administrative personnel to ensure a broad perspective and incorporate field-level input.

10.3 AUDIT FREQUENCY AND SCHEDULE
The City conducts SSMP audits at least once every three years, as required by the Order. A complete audit report is submitted to CIWQS within six months of the end of each three-year audit period.

An audit was performed in August 2024 for 3 -year audit period ending August 2, 2024 . The City’s next audit period end dates are:
• August 2, 20278
• August 2, 2030
• August 2, 2033

8 Based on https://www.waterboards.ca.gov/water_issues/programs/sso/lookup/ and an assumed 3-year audit frequency.

Element 10
Internal Audits

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10.4 AUDIT FINDINGS AND REPORTS
The City prepares a written audit report that includes the following:
• A summary of audit findings, including strengths and areas for improvement; • A list of recommended corrective actions or SSMP updates; • A statement confirming that sewer system operator input was considered; • A proposed schedule for implementing corrective actions or modifications.

Audit reports are submitted to CIWQS no later than six months after the end of the 3 -year audit period.

The 2024 SSMP Audit Report is included in Appendix G.

10.5 SSMP UPDATE PROCESS
Audit findings may result in identification of deficiencies or areas for program improvement. When updates are needed, the City will revise the SSMP accordingly to reflect corrective actions and significant program changes.

The SSMP will be updated at least once every six years and must be adopted by the City Council. Six-year updates to the SSMP will be submitted to CIWQS.

The City’s next SSMP update is due August 2, 20319.

9 Based on https://www.waterboards.ca.gov/water_issues/programs/sso/lookup/ and a 6-year update frequency.

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ELEMENT 11
Communication Plan
SWRCB Requirement (Order WQ 2022-0103-DWQ):
• The Plan must include procedures for the Enrollee to communicate with:
• The public for: Spills and discharges resulting in closures of public areas, or that enter a source of drinking water; and the development, implementation, and update of its Plan, including opportunities for public input to Plan implementation and updates. • Owners/operators of systems that connect into the Enrollee’s system, including satellite systems, for: System operation, maintenance, and capital improvement-related activities.

This element addresses the requirements outlined in Element 11 of the State Water Resources Control Board’s Waste Discharge Requirements for Sanitary Sewer Systems, as applicable to City’s system.

11.1 PUBLIC COMMUNICATION
The City maintains a website (http://www.hercules.gov/) to inform the public about City activities. The City’s website is an effective communication channel for providing alerts and news to the public. The website provides important announcements, public hearing notices, links to agendas and minutes for City Council meetings, and other key information for City residents. Community members can also sign up to be notified by email about City events and news by completing the eNotice Sign Up (https://www.herculesca.gov/our-city/enotice-sign-up). The City publishes the most up-to-date SSMP on the Public Works Department page of the City website.

The City communicates with the City Council at public meetings that allow for input from the public with regard to the implementation and performance results of the collection system operations.

Responsible Officials Contact Information

Appendix A
Element
Element Name
Position Title
Responsible City
Official
Phone
Email
I
Introduction & Goals
II
Organization
III
Legal Authority
V
Design and Performance Provisions
VIII
System Evaluation, Capacity
Assurance, and CIP
IX
Monitoring, Measurement, and
Program Modification
X
Internal Audits
Appendix E
Wastewater Collection System Master
Plan
Appendix F
SSMP Audit Reports
Appendix H
SSMP Council Adoption Documents
IV
Operations and Maintenance Program
VI
Spill Emergency Response Plan (SERP)
VII
Sewer Pipe Blockage Control Program
Appendix A
Responsible Officials Contact Info
Appendix B
Sewer System Major Equipment and
Critical Parts Inventory
Appendix C
Overflow Emergency Response Plan
(OERP)
Appendix D
Contra Costa Clean Water Program
FOG Outreach Materials
Appendix G
SSMP Change Log
XI
Communication Plan
Assistant Civil
Engineer
Jose Pacheco
(510) 799-8247
[email protected]
Public Works
Superintendent
Chris Morris
(510) 799-8252
[email protected]
Appendix A. City of Hercules (WDID: 2SSO10141)
Responsible Officials in SSMP Development - Contact Info Public Works
Superintendent
Chris Morris
(510) 799-8252
[email protected]
City of Hercules
Sewer System Management Plan
Last Revised: 06-08-26

2025 Pollution Minimization Report

Appendix B

Hot Spot List

Appendix C
Appendix C. City of Hercules Cleaning Hot Spot Locations Hot Spot Location Manhole(s) Issue Frequency of Check
Redwood & Sycamore
Intersection MH 288 Check Every 6 Months
Redwood & Fir Intersection MH 364 Check Every 6 Months
Lupine & Sycamore
Intersection (continue to next
MH on trail) MH 283
Redwood-Falcon @ Refugio
Valley Road Roundabout MH 489 Check Every 6 Months
Black Walnut & Silver Maple
Intersection MH 1254 Check Every 4 Months
Manzanita St MH 388 & 389 Check Every 6 Months
Turquoise & Sycamore
Intersection MH 757 Check Every 6 Months
Hannah School on RVR across
Parking Area MH 198 Check Every 6 Months
Sycamore MH 754 Check Every 6 Months
Sycamore MH 1455 & 1456 Root Issue Check Every 6 Months Canterbury Footpath MH 44 & 45 Root Issue Check Every 3 Months Canterbury & Newbury MH 55 Check Every 4 Months
Newbury All MH
Bristol & Canterbury
Intersection Check Every 6 Months
Silver Maple & Black Walnut MH 1255, 1254, 282, 281, 1725 Marigold & Columbine MH 116 Grease Issue Check Every 3 Months 148 Columbine MH 110, MH 109, MH 108, MH 107 Check Every 3 Months 226 Overlook Terrace MH 1429, 1730, 1731, 661 Check Every 6 Months 211 – 214 Apollo
MH 1503, 270, 1627, 1495, 1497,
1498 Root Issue Check Every 6 Months
Apollo MH 1493 Root Issue Check Every 6 Months
1003 Lavender Check Every 6 Months
Refugio Valley Road MH 1, 2, 775,774 Check Every 6 Months 209 Ben Lomond MH 685, 686, 687, 688 Check Every 6 Months N Wildwood MH 635, 642, 644, 646 Check Every 6 Months
139 Beryl Ct
MH 843, 844, 845, 846, 847, 848,
849 Check Every 4 Months
127 Lapiz Ct MH 857,860, 861, 862 Check Every 4 Months
Newbury from Willow Ave MH 261 Check Every X Months
City of Hercules
Sewer System Management Plan
Last Revised: 05-12-26

Critical Parts and Major Equipment

Appendix D
Appendix D-1. Major Equipment Inventory
Equipment/Part Equipment ID Number Available Location
Utility Truck 10 -
Portable Trash Pump (6-inch) 2 -
Portable Trash Pump (4-inch) 1 -
Portable Trash Pump (2-inch) 2 -
Backhoe 1 -
5 Yard Dump Truck 1 -
Portable Generator 8 -
Equipment/Part Equipment ID Pump Capacity Number Avail able Location Willow LS Backup Pump 1 Willow Lift Station
John Muir LS Backup Pump 1 John Muir Lift Station
Industrial LS Backup Pump 1 City Corporation Yard
Bayside LS Backup Pump 1 Bayside Lift Station
Victoria LS Backup Pump 1 Victoria Lift Station
Appendix D-2. Critical Parts
City of Hercules
Sewer System Management Plan
Last Revised: 04-29-26

Spill Emergency Response Plan

Appendix E

CITY OF HERCULES
WDID: 2SSO10141

SPILL EMERGENCY RESPONSE PLAN
(SERP)

Revised: June 2026

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June 2026

SANITARY SEWER SPILL

EMERGENCY RESPONSE PLAN

INTRODUCTION
The following sanitary sewer overflow scenarios were developed to address public health and regulatory concerns as the City of Hercules (WDID: 2SSO10141 ) desires to keep the city clean, healthy, and in compliance with sanitary sewer overflow laws.

This document is dynamic in nature and will be updated annually, or as necessary, to reflect new changes in the law, personnel, new public health information, unforeseen sanitary sewer overflow scenarios and changes in clean -up containment technologies. I t is intended to primarily address emergency sanitary sewer overflows that have public health significance. It is designed to protect public health and the environment by applying a process that will address a broad range of sanitary sewer overflow scenarios.

The objectives are to prevent the discharge of raw or partially treated sewage to any waters and to protect public health by preventing backup of sewage and subsequent discharge to basements, streets, and other public and private property.

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PROCEDURES
Flow Chart for Deciding How to Report a Sanitary Sewer
Overflow (SSO)

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A. What kind of Sanitary Sewer Overflows need to be reported:

B. Other Potential Contacts for Notification Purposes:

San Francisco Bay Region Water Quality Control Board (RWQCB) or Local RWQCB (510) 622-2300 (8 a.m. – 5 p.m.)
(510) 286-1255 (Voicemail)
Fax: (510) 622-2460
Contra Costa County Health Department
(925) 608-5500
Urban Creeks Council of California
(510) 540-6669
Fax (510) 848-2219
Local Agencies and Individuals:

Fire Department (510) 799-4575 Protect Public Health
Police Department (510) 724-1111 Road Block, Traffic Control, etc.

Public Works (510) 799-8200 Close areas such as beach, parks, fishing pier, etc.

Water District (866) 403-2683 Impact on drinking water storage or supply. • Contact as situation dictates.
• Report as soon as possible.
• Contact any local residents who may be impacted.
• Contact Supervisor, Manager or Director, as needed
C. Field Activities:

Typical Respondent’s role: (Bring Emergency Response Packet on all Calls.) a. Protect public health, environment and property from sanitary sewer overflows and restore area to normalcy as soon as possible.
b. Establish perimeters and control zones with cones, barricades, vehicles or terrain. c. Promptly notify agency communication centers of preliminary sanitary sewer overflow information and potential impacts.
d. Contain sanitary sewer overflow to the maximum extent possible. Every effort must be made to prevent the sanitary sewer overflow into surface waters. e. Fill out SSO form.

D. Relieving Cause of the Sanitary Sewer Overflow:

1. Relieve the stoppage as soon as possible by contacting contractor on local vendor list.

2. Refer to and follow all safety regulations.

3. Contain the sewage discharged to the maximum extent possible.

4. If sanitary sewer overflow enters the creek, use screen to collect solids.

5. Any sanitary sewer overflows over 10,000 gallons; the discharger should collect receiving water samples upstream and downstream of the sanitary sewer overflow and have them analyzed for total and fecal coliform. Soil samples may be required in the affected area.

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E. Sanitary Sewer Overflow Containment and Recovery:

1. Install air plugs on storm drains whenever appropriate to contain the sanitary sewer overflow.

2. Divert sanitary sewer overflow by building a small berm to change direction of flow to sewer.

3. Divert sanitary sewer overflow by pumping around overflow and return to sewer.

4. Contain sanitary sewer overflow by allowing it to collect in a naturally low area or pump to a storage tank and recover collected sewage as soon as possible.

5. Dike/dam or sand bag sanitary sewer overflow by building a dirt berm to collect the overflow.

F. Clean Up and Disinfection

1. Flush area with tertiary water. The amount of flush water should be at least three times the quantity of the sanitary sewer overflow.

2. If chlorinated water is used for disinfection, the water should be contained and returned to sewer.

G. Sign Posting and Barricading

1. Post “CONTAMINATED WATER” signs and block the contaminated area with “yellow caution” tape barricades. Do not remove these until the lab tests are cleared.

H. Sewer Backup Involving Private Property Standard Operating Procedures (SOP) Refer to Emergency Response Plan (ERP) for situational procedures. • Emergency Response Packet Includes:
— Camera
— Cell Phone
— Emergency Response Plan
— Radio
FIRST – Determine if stoppage is in the City main line. • IF YES – Contact contractor on local vendor list to relieve the blockage and backup and call a City staff Supervisor or Manager.
• IF NO – Inform customer that the problem is in their private line and that a plumber of their choosing should be contacted to fix the problem.

NEXT - Ask customer if they desire cleanup:
• IF YES – Call E.V. Link @ 1-800-413-2999 or 707-479-1375 (Bruce Burnett). Request a cleanup crew be dispatched. Ask for ETA and relay information to customer. If for some reason E.V. Link cannot be reached, refer to ERP for alternate restoration companies.

DO NOT ATTEMPT TO CLEAN SEWAGE BACKUP INSIDE THE BUILDING YOURSELF. • IF NO – Request that the customer sign a “Refusal of Service” form. If customer does not wish to sign this form, fill out form and note that they chose not to sign.

Inform customer to:
• Keep pets and inhabitants from walking through spill.

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• Put towels or some form of diversion to keep the spill from reaching floor vents and spreading.
• Start making a list of items and areas affected by the spill. • Contact their insurance company.

Take pictures of affected areas and items.

If relocation to a motel is requested, call from the list in the ERP to accommodate.

Inform the customer that you can only authorize a one-night stay or until the next business day when a City of Hercules representative or a representative from the City’s insurance company would contact them.

Do not volunteer or disown City liability. If asked about liability, inform them that the City’s insurance representative would determine liability.

Always maintain a professional and courteous approach to these matters. Put yourself in the customers’ position and understand that this can be a very stressful and aggravating situation. The customer, understandably, may not be very pleasant.

DO NOT WALK AWAY FROM AN UNRESOLVED SANITARY SEWER OVERFLOW (SSO)

THAT HAS THE POTENTIAL FOR IMMEDIATE IMPACT ON PUBLIC HEALTH, SAFETY, OR ENVIRONMENTAL DANAGER.

If there is a discrepancy as to responsibility, and/or no other timely solution to resolving an SSO, we will make every effort to fix the problem. All financial and legal responsibilities will be left to determine at a future time.

For containment and cleanup of outdoor spills, refer to ERP.

In the event that the customer is without service and chooses not to relocate, contact vendor from local vendor list for (2) portable chemical toilets as an option for a short- term solution.

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June 2026

COLLECTION SYSTEM DEPARTMENT
Sanitary Sewer Overflow
Calculation Method
To calculate the number of gallons in a sanitary sewer overflow, you must determine the volume of the sanitary sewer overflow. If it is a rectangular contained area:

V=L x W x D x 7.48 = Gallons
Example: A spill 100’ x 100’ x 6”
100’ x 100’ x .5’ x 7.48 = 37,400/gallons
If you are dealing with a sanitary sewer overflow that has been running into a storm drain, you must estimate the gallons by the amount of time of the overflow x the number of connections on the receiving line (200 gallons per household per 24 hours).

Example: If you have a line with 6 houses on it and it has been overflowing for 24 hours:
6 x 200/gallons = 1,200/gallons
Example: If you have 60 houses on a line that has been overflowing for 1 hour:
60 x 200/gallons divided by 24 hours = 500/gallons

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August 2023

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August 2023

HOMEOWNERS ASSOCIATIONS
Contact List
Homeowner Association Management Company
Alexandria at Victoria Community Association Bay Area Property Services Attn:

Selina Bravo, ext. 141
20 Great Oaks Boulevard, Ste. 210 San Jose, CA 95119
Phone: (925) 746-0542
Email: [email protected]
Catherine Chan, Assistant, ext. 127
Email: [email protected]
Hours: M-F 9am – 5pm
Bayside HOA
N Front Lewis
Drake Ferello
Cabrillo Tsushima (N)
DeAnza Clark
S Front Serra
Collins Management Company Attn:

Kristian Hill, ext. 27
500 Alfred Nobel Drive, Ste. 250 Hercules, CA 94547
Phone: (510) 262-1795; Fax: (510) 262-1797
Email: [email protected]
Hours: M-F 9am – 5pm Closed 12-1 for lunch
Bay Pointe HOA
Boatswain Oarsman So. Wind
Compass Pt., Porthole Sunset Crow’s Nest,
Scupper Tidewater
Lagoon Seagull Whaler Lighthouse
Seaway Malibu Sextant
Collins Management Company Attn:

Michael Lee, ext. 23 (also April)
500 Alfred Nobel Drive Hercules, CA 94547
Phone: (510) 262-1795; Fax: (510) 262-1797
Email: [email protected];
Hours: M-F 9am – 5pm Closed 12-1 for lunch
Belleterre HOA: Schuler Homes
Crestridge Riverview Titan Overlook Ridgepoint
Rocky Pointe Lookout Ridgeview Shipwatch
Rimrock
Willis Management Group Attn:

Erin LaFlamme, ext. 105
3180 Crow Canyon Place, Ste. 100 San Ramon, CA 94583
Phone: (925) 901-0225; Fax: (925) 901-0553
Email: [email protected]
Hours: M-F 9am – 5pm
Bravo HOA
Dorado Tuscany
Florence Sorrento
Marsala Palermo Napoli
Collins Management Attn:

Rhiannon Harris
500 Alfred Nobel Dr Ste 250
Hercules, CA 94547
Phone:(510) 262-1795 x66
Email: [email protected]
Assistant: Stephen Sulyma
Email: [email protected]
Caprice HOA
Caprice Haviture Way Vierra
Common Interest Management Attn:

Rhiannon Harris, ext. 283
315 Diablo Road., Ste. 221
Danville, CA 94526
Phone: (925) 743-3080, ext. 291 Fax: (925) 743-3084
Email: [email protected]
Hours: M-F 8:30am – 4:30pm Closed 12-1 for lunch

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June 2026

Homeowner Association Management Company
Chelsea by the Bay HOA
Brenner Cardoza O’Neil Variz Weiss
Collins Management Attn:

Rhiannon Harris
500 Alfred Nobel Dr Ste 250
Hercules, CA 94547
Phone:(510) 262-1795 x66
Email: [email protected]
Tammy x67
Email: [email protected]
Coventry HOA
(does their own streetlights)

Camden Hampton Kensington
Collins Management Attn:

Jennifer Salazar
500 Alfred Nobel Dr Ste 250
Hercules, CA 94547
Phone:(510) 262-1795 x58
Email: [email protected]
Cottage Lane HOA Collins Management Attn:

Grace Chang
500 Alfred Nobel Dr Ste 250
Hercules, CA 94547
Phone:(510) 262-1795 x24
Email: [email protected]
Country Run HOA
Arete Peak
Basin Pinnacle
Bluff Playa
Crag Range
Hill Terrace
Knoll Valley Run
Miramonte Company Attn:

Lin Yates or Noelle Johnson
1225 Alpine Road, Ste. 206 Walnut Creek, CA 94596
Phone: (925) 932-7100 Fax: (925) 932-7150
Emails: [email protected] or
[email protected]
Hours: M-F 8:30am– 4:30pm Closed 12-1 for lunch
Devonwood Condo Owners Association Common Interest
315 Diablo Rd #221
Danville, CA 94526
Phone: (925) 743-3080
Forest Park HOA
(Village coalition)
Massingham & Associates Management Inc Attn:

Linda Schoeffner, Property Manager
Concord, CA 94520
Phone: 925-405- 4900 fax: 925-677-7398

Peter Kodzis, President
2621 Lucas Avenue, Pinole, CA 94564
Phone: 243-0699
Foxboro Downs HOA
Bristol Chelsea Dover Weymouth Windsor
Matrix Association Management Attn:

Jeff Karimi, ext. 14
1415 Oakland Blvd, Ste. 102 Walnut Creek, CA 94596
Phone: (925) 951-6240; Fax: (925) 951-6242
Email: [email protected]
Hours: M-F 9am – 5pm

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June 2026

Homeowner Association Management Company
Foxboro Heights HOA
Bedford Newbury
Brighton Oxford Canterbury
Cardiff ( SINGLE FAMILY )
Dartford Edinburgh
Hudson Management Attn:

Aubria Bauder, x108 [email protected]
425 Gregory Lane, Ste. 101
Pleasant Hill, CA 94523
Phone: (925) 827-2200; Fax: (925) 827-2219
Email: [email protected];
Hours: M-F 8am – 4:30pm
Foxboro Village HOA
Coventry Manchester Davenport
Sheffield Glasgow Worthing Lancaster
London Liverpool (TOWNHOMES )
Matrix Association Management Attn:

Jeff Karimi, ext. 14
1415 Oakland, Blvd, Ste. 102 Walnut Creek, CA 94596
Phone: (925) 951-6240; Fax: (925) 951-6242
Email: [email protected]
Hours: M-F 9am – 5pm
Glenwood at Village Park Owner's Association
Hercules Retail Center
Collins Management Company
500 Alfred Nobel Drive Hercules, CA 94547
Phone: (510) 262-1795; Fax: (510) 262-1797
Hours: M-F 9am – 5pm Closed 12-1 for lunch
Hercules Retail Center Harpreet (Harry) Sidhu, CBI, CBB 46560 Fremont Blvd, Ste 111, Fremont, CA 94538
Direct: (510) 490 9705 Cell: (510) 366 6130
BRE Lic #01433114 Broker Corp Lic #01792260

Hercules by the Bay HOA
Bay Street
Buckley Dunham Hercules Avenue
Skelly Fawcett Stout Pavon Williams
Pearce Woodfield
Rosti Santa Fe

Historic Homes District & Pinole
Willis Management Group Attn:

Erin LaFlamme, ext. 105
3180 Crow Canyon Place, Ste. 100 San Ramon, CA 94583
Phone: (925) 901-0225; Fax: (925) 901-0553
Email: [email protected]
Hours: M–F 9am – 5pm
North Shore Business Park Global & Real Estate Facilities & EHS Attn:

Carla Evans, Director
Phone: (510) 741-6353; Fax: (510) 734-0652
Email: [email protected]
Hours: M – F 8am – 5pm
Olympian Hills HOA
Apollo Olympus
Athena Orion
Atlas Zephyr Bacchus
Zeus Hera Nike Hermes
Willis Management Group Attn:

Cheri Cole, ext. 313
3180 Crow Canyon Place, Ste. 100 San Ramon, CA 94583
Phone: (925) 901-0225; Fax: (925)901-0553
Email: [email protected]
Hours: M–F 9am – 5pm
Promenade HOA
Earnest Railroad Ave Main Talley
Park Taraya Promenade
Willis Management Group Attn:

Tony Abad, ext. 102
3180 Crow Canyon Place, Ste. 100 San Ramon, CA 94583
Phone: (925) 901-0225; Fax: (925) 901-0553
Email: [email protected];
Hours: M–F 9am – 5pm

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June 2026

Homeowner Association Management Company
Refugio Heights HOA
Armstrong
Balboa Fremont
Carson Halsey Coronado Raleigh
Cortes Stanley
Decatur Grissom Farragut Shepard
Peachtree CAS Attn:

Donald Huey, Senior Manager
Email: [email protected]
4760 Willow Rd #100 Pleasanton, CA 94588
Phone: 510-487-3383
HOA Manager: Teri Harris x3305
Email: [email protected]
Refugio Valley Ranch Master Association HOA
Aruba Cayman Bermuda
Grenadine Bonaire Mandalay
Catalina Montego

Marstern Ranch( May Include) Not an Active HOA

Also: Southwind & Some RVR

See Refugio Valley Ranch Master om previous page
For Hillside and trees only is:

RealManage Attn:

Nicholas Aquinto
1701 Novato Blvd., Ste. 209 Novato, CA 94945
Phone: (866) 473-2573
Email: [email protected]
Phone: (415) 444-1600 Fax: (866) 919-5696
Hours: M-F 9am – 5pm
Sycamore Villas HOA

Black Walnut, Blue Cypress Dutch Elm, Mahogany,
Rosewood, Silver Maple
Collins Management Company Attn:

Kristian Hill
500 Alfred Nobel Drive Hercules, CA 94547
Phone: (510) 262-1795; Fax: (510) 262-1797
Email: [email protected];
Hours: M-F 9am – 5pm Closed 12-1 for lunch
Valley Oak Villas HOA
Amber Aquamarine Crystal Moonstone Sapphire
Collins Management Company Attn:

Christine Alfaro, ext. 19
500 Alfred Nobel Drive, Ste. 250 Hercules, CA 94547
Phone: (510) 262-1795 Fax: (510) 262-1797
Email: [email protected]
Hours: M-F 9am – 5pm Closed 12-1 for lunch
Venture Professional Collins Management Company Attn:

Paul Collins, ext. 11
500 Alfred Nobel Drive, Ste. 250 Hercules, CA 94547
Phone: (510) 262-1795; Fax: (510) 262-1797
Email: [email protected]
Hours: M-F 9am – 5pm Closed 12-1 for lunch
ViewPointe – Rodeo, CA Collins Management Company Attn:

Genine Kennedy, ext. 14
500 Alfred Nobel Drive, Ste. 250 Hercules, CA 94547
Phone: (510) 262-1795; Fax: (510) 262-1797
Email: [email protected]
Hours: M-F 9am – 5pm Closed 12-1 for lunch

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June 2026

Homeowner Association Management Company
Victoria By The Bay Association Vierra Moore Company Attn:

Brandon Whitlow – Property Manager, x427
2870 Gateway Oaks Drive, Ste. 100 Sacramento, CA
95833
Phone: (916) 925-9000; Fax: (916) 567-6222
Email: [email protected]
Hours: M-F 8am – 5pm Closed 12-1 for lunch
Westwood Duets HOA

Felton Lampico
Scotts Valley Ben Lomond Mission Springs
Bonne Dunne
Peachtree Community Association Services Attn:

David Hallmark, ext. 34
30100 Mission Blvd. Hayward, CA 94544
Phone: (510) 487-3383; Fax: (510) 487-6936
Email: [email protected]
Emergency/Immediate Assistance: (800) 879-0476
Hours: M-F 9am-5pm Closed 12-1 for lunch
Wildwood at Village Park HOA

Wildwood
Bay Area Property Service Attn:

Maria Aguayo
1661 Tice Valley Blvd., Ste. 200 Walnut Creek, CA 94595 Phone: (925) 746.0542 Fax: (925) 746-0554
Email: [email protected];
Hours: M-F 9am – 5pm
Willow Glen – Rodeo, CA Collins Management Company Attn:

Grace Chang, ext. 24
500 Alfred Nobel Drive, Ste. 250 Hercules, CA 94547
Phone: (510) 262-1795; Fax: (510) 262-1797
Email: [email protected]
Hours: M-F 9am – 5pm Closed 12-1 for lunch
Willows Shopping Center Gallagher & Miersch Attn: Scott Gallagher 1390 Willow Pass Road, Ste. 220 Concord, CA 94520
Phone: (925) 671-7000 Fax: 925-671-9107
Email: [email protected]
Hours: M-F 8am – 5pm

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June 2026

Other Contacts
Animals
Animal Control (510) 374-3966 (510) 646-2995 (Weekends) Bee Removal (925) 685-9301 (CCC Mosquito & Vector Control) A & B Swarm Removal (510) 458-3900
Dan Davidson (510) 429-1717
Pat Homen (510) 357-3835
Rodent Control (925) 685-9301 (CCC Health Dept)
Governmental
Cal Dept of Transportation (510) 286-6359
California Highway Patrol (925) 646-4980 (707) 551-4200 Option 3 Communications Center)
Cal OSHA (925) 602-6517
Cal Trans/Delta Region/Maint. (925) 926-6112
City of Hercules (510) 799-8200
City of Hercules/Jose/PW (510) (799-8247
City of Hercules/Jeff/PW (Cell) (510) 812-4630
City of Richmond (510) 620-6538
CCC Flood Control (925) 313-2270 Mon. – Thurs 6:30 a.m. to 5:00 p.m.

CCC Flood Control/Maint. Div. (925) 313-7000
CCC Health Dept (925) 646-5225
CCC Public Works/Maint. Div. (925) 313-7000
CCC Sheriff (925) 646-2441
CCC Signal Maintenance (925) 313-7052 (925) 313-7054 (Pager Traffic Signals) Dept Motor Vehicles (800) 777-0133
East Bay Regional Parks (510) 544-3010 (510) 237-6896 (John Hitchen) EPA/Dept. of Toxic Substance (8-5) (510) 540-2122 (800) 260-3972 (ER Response) Rodeo/Hercules Fire (510) 799-4575
Hercules Police (510) 724-1111 Dispatch
Media (Newspaper)
San Francisco Chronicle (415) 777-1111
West County Times (510) 262-2787

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June 2026

Television
KGO - 7 (415) 954-7777
KPIX - 5 (415) 362-5550
KRON - 4 (415) 561-8000
KTVU - 2 (415) 834-1212
Medical
Concentra Medical Center (510) 222-8000 (Monday - Friday only) Doctors Hospital (San Pablo) (510) 970-5000
Kaiser Hospital (Martinez) (925) 372-1999
Kaiser Hospital (Richmond) (510) 307-1500
Kaiser Hospital (Vallejo) (707) 651-1000
Pipeline Companies
Chevron Pipelines (800) 762-3404
Kinder Morgan Pipelines (510) 233-2027
Tosco/Conoco/Phillips Pipelines (800) 448-7676
Transportation
AC Transit (510) 817-1717
BART (510) 464-6725
West Cat (510) 724-7993
Burlington Northern Santa Fe (800) 832-5452
*(909) 386-4217 (Emergency Service Interrupt)
Union Pacific Railroad (510) 891-7510 (800) 892-1283
Utilities
EBMUD (Maintenance Yard) (510) 222-7976 (510) 835-3000 – Main # After Hours) Pacific Bell 611
Pacific Gas & Electric (800) 743-5000
Underground Service Alert (800) 227-2600
West County Waste Water District (510) 222-6700 (510) 222-6799 (After Hours) Vendor Listings
Asphalt / Concrete
Syar Industries (510) 215-1555
Berkley Asphalt / Concrete (510) 526-1611

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June 2026

Building Supply / Hardware / Keys
Armor Locksmith (510) 799-1000
Dolan’s Lumber (510) 724-8753
El Cerrito Lumber (510) 234-2213
Ferguson Enterprises (925) 432-7375
Harbor Freight Tools (707) 645-0185
Humus (510) 233-7745
Lanier Electric (510) 215-5100
San Pablo Plumbing Supply (510) 234-5400
Zac Kit (707) 644-6676
Home Depot (510) 245-9572
Contractors
Andre’s Mechanical & General Eng (925) 323-1871 (Hercules Lift Stations) Aquatic Commercial Pool Service (408) 741-5871
Bill’s Underground (510) 719-1739 Cell# (510) 932-1736 Calcon System (925) 277-0665 (925) 570-8479
Carone & Sons (Joel) (Crockett) (510) 787-7283 (Roll Off Bins, Excavations, Haz Mat Lic.) Carone, Bruce (Concord) (925) 691-2030 Bruce & Lloyd Carone (Excavations) Bruce’s—Res: (925) 313-5980 Cell (925) 383-0095
Contra Costa Pool (510) 724-7665 (510) 799-4404
Ernies Plumbing (510) 758-1900 Cell# (510) 207-0825 Kel Aire (510) 758-4232
Morgan Fence (707) 428-3302
H&R Plumbing (510) 222-5556
Pacific Pipelines (707) 689-3357
Roto Rooter (925) 939-3100
Universal Building Supply (510) 527-1078 Janitorial Service Pacific Site Maintenance (510) 223-6597
Equipment Rental
Allied Propane (510) 237-7077
Bay Area Barricade (925) 686-1089
Cresco (925) 228-9811
Hertz Equipment (510) 307-4444
Rain for Rent (24 Hr) (510) 458-0200 (21,000 gals delivered in 24 hrs)

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June 2026

United Rentals (510) 562-3000
D.P. Nicoli (800) 695-5007 Shoring
The Construction Zone (925) 387-8013
Motels
Days Inn (Appian Way) (510) 222-9400
Motel #6 (Fitzgerald Drive) (510) 222-8174
Sewer & Storm Drain Supplies
Central Precast Concrete Inc. (925) 462-6802
D & L Supply (800) 422-0848
Phoenix Iron Works (510) 465-9900
Weco (707) 644-6661
Sewer Clean-up & Drying
E.V. Link (Bruce Barnett) (800) 413-2999 (707) 479-1375 Cure – Water Damage Restoration (925) 299-8706
Er: (800) 470-2873/Msg: (925) 299-9672
Cell: (925) 437-3113
Ideal Restoration (800) 379-6881 24 hr. Sewage Clean Up Towing
AAA Towing (800) 222-4357
Freeman Towing (510) 233-0878
J & O Tire (510) 237-6344
Oliver’s Tow (510) 758 3790
S & S Towing (510) 232-8000
Traffic Safety Supplies
Bay Area Barricade (925) 686-1089
California Bag Company (415) 824-6427
The Construction Zone (925) 387-8013
Zumar (800) 654-5164

17 City of Hercules
August 2023

City of Hercules
Warning

Raw Sanitary Sewer Overflow--Area Closed—Entry Prohibited

CONTAMINATED WATER

DO NOT DIGEST, WADE, SWIM, FISH
OR

COME IN CONTACT

PLEASE KEEP CHILDREN
AND

PETS OUT OF THE AREA

Questions concerning exposure, posting, and clean-up should be directed to the
City of Hercules Public Works Department during business hours at (510) 799-8200

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August 2023

City of Hercules
111 Civic Drive
Hercules, CA 94547
(510) 799-8200

Refusal/Acceptance of Overflow Clean-up Services
Resident/Owner Information
Overflow Address: _____________________________________________________________________________ Owner’s Address if different than above: ___________________________________________________________ Phone Number: _______________________________________________________________________________ Subject: Refusal/Acceptance of Property Clean-up Service Due To Sewage Overflow Provide details of overflow:
_______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ _______________________________________________________________________________________________ Date: _________ Time: _________
By signing below, homeowner or resident acknowledges acceptance of clean-up services:

Signature:______________________________________________________________________________________ Printed Name: _________________________________________________________________________________ Date: _________________________________________________________________________________________ By signing below, homeowner or resident acknowledges that clean-up services were offered, but were refused.

Date: _________________________________________________________________________________________ Signature:______________________________________________________________________________________

CITY OF HERCULES
Sanitary Sewer Spill (Spill) Field Report WDID: 2SSO10141 | Form Rev. 5/26/26

City of Hercules | Sewer System Management Plan Spill Field Data Form

Page 1 of 6 ends

SECTION A | INCIDENT IDENTIFICATION

Operator Arrival
Date/Time (CIWQS Q4) Date/Time Cal OES
Notified (CIWQS Q6)
Date Reported Time Reported
Date Spill Started Time Spill Started
Date Spill Ended Time Spill Ended
Spill Duration (hrs) CIWQS Event ID (after entry)

Reported By (Name / Phone)
Location / Address of Spill
APN / Nearest Cross Street
GPS Spill Origin (Latitude,
Longitude)
Crew Responding (Names)

SECTION B | SPILL CATEGORY DETERMINATION (Circle/Check One)

Cat. Description Reporting Deadline / Notification
1 Any volume reaching surface water
or a drainage conveyance system
that discharges to surface water
Draft within 3 business days; certify within 15 calendar days. Notify CalOES (800-852- 7550) within 2 hours if ≥1,000 gal.

Notify RWQCB & local health agency immediately.
2 ≥ 1,000 gallons; no discharge to
surface water
Draft within 3 business days; certify within 15 calendar days.

Notify CalOES within 2 hours if ≥1,000 gal.
3 ≥ 50 and < 1,000 gallons; no
discharge to surface water
Certify within 30 calendar days of spill end.
4 < 50 gallons; no discharge to surface
water
Report in monthly No-Spill / Cat. 4 certification.

CITY OF HERCULES
Sanitary Sewer Spill (Spill) Field Report WDID: 2SSO10141 | Form Rev. 5/26/26

City of Hercules | Sewer System Management Plan Spill Field Data Form

Page 2 of 6 ends

SECTION C | VOLUME ESTIMATION

Estimated Total Volume (gallons)
Volume Recovered (gallons)
Volume Discharged to Environment
(gallons)
Estimation Method Used ☐ Visual ☐ Area x Depth ☐ Duration x Flow Rate ☐ Contractor Estimate ☐ Other: ____________
Volume Estimation Notes /
Calculations

SECTION D | SPILL SOURCE AND CAUSE

Spill Appearance Point ☐ Manhole ☐ Cleanout ☐ Private Lateral ☐ Force Main ☐ Other: ___________
Cause of Spill
☐ Root Intrusion ☐ Grease Blockage ☐ Debris/Rags ☐ Structural Defect ☐ Pump Station Failure ☐ Vandalism ☐ Flow Surcharge (I/I) ☐ Other: ___________
System Asset ☐ Gravity Main ☐ Force Main ☐ Lift Station ☐ Private Lateral □ Other Manhole or Asset ID
Pipe Material / Diameter
Estimated Year Installed
Was the spill associated with a storm
event? Yes ☐ No ☐ Unknown ☐

SECTION E | SPILL DESTINATION AND ENVIRONMENTAL IMPACT

Spill Destination(s)
☐ Remained on Pavement ☐ Storm Drain Inlet ☐ Drainage Channel ☐ Soil/Landscaping ☐ Contained (vacuum truck)
☐ Receiving Water (name): __________________________
Did spill reach surface water (creek,
bay, slough, storm drain)? Yes ☐ No ☐ Unknown ☐ Is spill area hydrologically connected
to San Pablo Bay / receiving water? Yes ☐ No ☐ Unknown ☐ Was spill within 1,000 ft of a potable
water intake? Yes ☐ No ☐ Unknown ☐
Was there public contact with
sewage? Yes ☐ No ☐ Unknown ☐

CITY OF HERCULES
Sanitary Sewer Spill (Spill) Field Report WDID: 2SSO10141 | Form Rev. 5/26/26

City of Hercules | Sewer System Management Plan Spill Field Data Form

Page 3 of 6 ends

Name of Receiving Water (if
applicable)
Type of Receiving Water (if
applicable)
☐ Creek/Stream ☐ River ☐ Bay/Estuary ☐ Ocean/Coastal ☐ Lake/Reservoir ☐ Wetland ☐ Groundwater
☐ Other: ________
Describe Path to Drainage/Receiving
Water

SECTION F | RESPONSE ACTIONS TAKEN

Containment Method(s) ☐ Sandbags/Berms ☐ Vacuum Truck ☐ Storm Drain Blocked ☐ Plugged MH ☐ Other: _______
Corrective Action Taken (Cleared
Blockage, Repair, etc.)
☐ Hydroflushed ☐ Rodded ☐ Emergency Repair ☐ Bypass Pumping ☐ Other: _______
Was the spill area cleaned and
disinfected? Yes ☐ No ☐ Unknown ☐
Were warning signs or door
hangers posted at the spill area? Yes ☐ No ☐ Unknown ☐ Were warning signs posted
warning the public? Yes ☐ No ☐ Unknown ☐
Vacuum Truck Volume Recovered
(gal)
Describe Cleanup and Restoration
Actions

SECTION G | REGULATORY NOTIFICATIONS

Agency / Contact Required When Notified? (Y/N) Date/Time | Control No.

Cal OES (800-852-7550) Cat. 1 or 2 ≥1,000 gal within
2 hrs

SF Bay RWQCB – Region 2 Cat. 1 immediately; Cat. 2
within 24 hrs

Contra Costa Environmental Health Cat. 1; public health threat East Bay Municipal Utility District (EBMUD) – if
near intake
Spill within 1,000 ft of intake
City of Hercules Public Works Director All Cat. 1 & 2; Cat. 3 per SSMP

CIWQS – Draft Spill Report entered by: All Cat. 1, 2, 3

CITY OF HERCULES
Sanitary Sewer Spill (Spill) Field Report WDID: 2SSO10141 | Form Rev. 5/26/26

City of Hercules | Sewer System Management Plan Spill Field Data Form

Page 4 of 6 ends

CIWQS – Certified by LRO: All Cat. 1, 2, 3
SECTION H | WATER QUALITY MONITORING (Category 1 Only)

Was water quality monitoring
required (Cat. 1 spill)? Yes ☐ No ☐ Unknown ☐ Were samples collected? Yes ☐ No ☐ Unknown ☐ Sampling Location(s)
Sample Date/Time
Chain of Custody No.

Monitoring Notes / Results Summary

SECTION I | PRELIMINARY FAILURE ANALYSIS

Root Cause Assessment
☐ Inadequate Maintenance Frequency ☐ Aging Infrastructure ☐ Third-Party Damage ☐ Operator Error ☐ I/I Surcharge ☐ Power Failure ☐ Unknown at time of response ☐ Other: ___________
Was this location previously
cleaned/inspected in last 12 months? Yes ☐ No ☐ Unknown ☐ Is a follow-up CCTV inspection
required? Yes ☐ No ☐ Unknown ☐
Is a corrective maintenance work
order being issued? Yes ☐ No ☐ Unknown ☐
Corrective / Preventive Actions
Planned (include Work Order # if
issued)

SECTION J | SITE SKETCH AND PHOTO LOG

Photos taken? Yes ☐ No ☐ Unknown ☐
No. of Photos Taken
Photo File Location / Reference

CITY OF HERCULES
Sanitary Sewer Spill (Spill) Field Report WDID: 2SSO10141 | Form Rev. 5/26/26

City of Hercules | Sewer System Management Plan Spill Field Data Form

Page 5 of 6 ends

Site Sketch (attach or draw below)

SECTION K | SEWER BACKUP INTO PRIVATE PROPERTY (Complete If Applicable)

Did sewage back up into private
property (home or business)? Yes ☐ No ☐ Unknown ☐ Property Owner / Occupant Name
Property Address
Property Owner Phone
Was cleaning service
offered/provided? Yes ☐ No ☐ Unknown ☐
Was claim form provided to property
owner? Yes ☐ No ☐ Unknown ☐
Was door hanger left? Yes ☐ No ☐ Unknown ☐
Backup Notes

CITY OF HERCULES
Sanitary Sewer Spill (Spill) Field Report WDID: 2SSO10141 | Form Rev. 5/26/26

City of Hercules | Sewer System Management Plan Spill Field Data Form

Page 6 of 6 ends

SECTION L | CERTIFICATION AND SIGNATURES

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 gathered and evaluated 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.

First Responder (Print Name)
First Responder Signature / Date
Crew Supervisor (Print Name)
Crew Supervisor Signature / Date
Legally Responsible Official (LRO)
– Print Name
LRO Signature / Date (for CIWQS
certification)

SECTION M | POST-RESPONSE CHECKLIST

# Task Done
1 Spill area contained and cleaned; disinfectant applied ☐ 2 Spill cause corrected (blockage cleared, pump restored, etc.) ☐ 3 All required agencies notified (see Section G) ☐
4 Cal OES notified (Cat. or Cat. 2 with volume ≥1,000 gal) and control number recorded ☐ 5 Signs posted warning the public of the spill incident ☐ 6 Draft Spill report entered in CIWQS within 3 business days (Cat. 1, 2, 3) ☐ 7 Certified Spill report submitted in CIWQS by LRO within required deadline ☐ 8 Water quality sampling completed if Cat. 1 (see Section H) ☐ 9 Photos and site sketch filed in spill incident record ☐ 10 Private property claim form provided if applicable (see Section K) ☐ 11 Follow-up CCTV or corrective maintenance work order issued if required ☐ 12 Post-spill debrief and failure analysis scheduled (Cat. 1, 2, or recurring) ☐ 13 Spill incident file created and filed at Public Works ☐

Retain completed form in City of Hercules SSMP Spill Incident File. Retain records for a minimum of 5 years per WQ 2022-0103-DWQ Section 5.13.

Contra Costa Clean Water Program
Public Outreach Materials

Appendix F

City of Hercules 2024 SSMP Audit Report

Appendix G

PREPARED BY

Sewer System Management Plan

2024 SSMP Audit Report

PREPARED FOR

C
ity of Hercules

AUDIT
REPORT |
AUGUST 2024

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ewer System Management Plan

2024 SSMP Audit Report

INTRODUCTION

This audit was performed in August 2024 on the City of Hercules’ (City) January 2019 Sewer System Management Plan (SSMP)
–

WDID 2SSO10141
–

as required by the State Water Board Order No.

2022
-

0103
-

DWQ, Statewide
Waste Discharge Requirements for Sanitary Sewer Systems (WDR, General Order).

According to the State Water Board
Sewer System Management and Program Audit Due Dates Look Up

website
1 , the City’s next SSMP update is due August 2025. The City’s SSMP was last updated in 2019.

The

City updated the Spill and Emergency Response Plan (SERP, formerly Overflow Emergency Response Plan) portion of the SSMP in June 2023 as required by the State Board.

The City’s SSMP was last audited in June 2023 based on the 2006 General Order (retroactive audit, covering the 4
-
year period from January 2019 to January 2023). Therefore, this audit covers the period from January 2023 to August 2024. This August 2024

audit will align the City with the State Water Board’s
due dates.

The intent of the audit is to evaluate the SSMP’s compliance with WDR Order No. 2022 -
0103
-
DWQ and
the effectiveness of the SSMP individual elements.

AUDIT PROCESS

The
2024 audit methods included a Gap Analysis and an Effectiveness Evaluation using the City’s performance
indicators. The audit findings and recommendations will be used to update the City’s SSMP during the next required update (due August 2025), or specific elements that are required to be updated before August 2025.

GAP ANALYSIS

The Gap Analysis evaluated whether the SSMP is compliant with the WDR. The Gap Analysis uses industry reference materials, benchmarking data, and State Board regulatory enforcement procedures to identify areas for improvement in the SSMP itself, or the Cit
y’s management or maintenance procedures.

The Gap Analysis results are presented in Table 1 below. An “X” indicates that a gap exists as described in the column. An element with a “check mark” indicates the element is found to be in compliance with the WDR. Comments indicate action items recommend
ed to comply with the WDR or to improve the SSMP
as a management tool. The column at the far right indicates how the gap will be addressed in the forthcoming 2025 SSMP update. At the end of each Element section, a summary of the effectiveness of the SSMP E
lement is provided along with suggestions on improvement if applicable. Effectiveness is further evaluated the City’s performance indicators, as summarized in the last section of this report.

1 https://www.waterboards.ca.gov/water_issues/programs/sso/lookup/

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Table 1. SSMP Gap Analysis

Requirement

WDR

Compliance

Gap

Comments
/Recommendations

Changes

to
SSMP Required

GENERAL ITEMS

1. SSMP Document Name

✔



No Gap Identified

2. System Overview section



Review definitions and abbreviations, include Category 4 spills

Update spill references to
include
Category 4 spills.

ELEMENT 1
–

GOAL AND INTRODUCTION

Are the goals stated in the SSMP still appropriate, i.e.: properly manage, operate, and maintain all parts of sanitary sewer system.

The Plan must include a narrative introduction
section that discusses the following items:

1.1 Regulatory context

–

Provide a general
description of the local sewer system
management program and discuss Plan
implementation and updates.



Provide a brief description of schedule for goals mentioned (i.e., maintenance schedule, % cleaned/inspected yearly, # of
manholes, etc.)



Recommend reviewing goals to make sure they reflect current City practices and initiatives.



Update narrative to include Category 4 spill description added in the new General Order

Provide a general schedule for
goals mentioned and include
Category 4 spills in spill
description section.

1.2 Audits

SSMP Plan audit and update
schedule. Including milestones for
incorporation of activities to address
and prevent spills



Include an SSMP audit, and SSMP update schedule. Deadlines can be found on the waterboard website.



https://www.waterboards.ca.gov/water_issues/programs/sso/lookup/

Include a graphic or table with the
audit and update deadlines
provided
by

the Board.

1.3 Sewer System Asset Overview

–

description of assets and service area

✔



No Gap Identified

Effectiveness

Element

1 Element is effective if updates are made. See Recommendations.

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Table 1.

SSMP Gap Analysis

Requirement

WDR

Compliance

Gap

Comments
/Recommendations

Changes

to
SSMP
Required

ELEMENT 2

–

ORGANIZATION

The Plan must identify organizational staffing responsible and integral for implementing

the local Sewer System
Management Plan through an organization chart or similar

narrative documentation that includes:

2.1 Name of Legally
Responsible

Official

(LRO) in SSMP.

✔



No Gap Identified. In the new General Order some sections have shifted, recommend reviewing this
section to align with the
general order numbering, though not required.

2.2 City

Organization

Chart
that is
current. Including titles, numbers,
and email addresses.



Several role titles and staff changes have occurred since 2019.

Role
responsibilities and processes are correct but should be updated.

Update organization chart, role titles
and staff name.

2.3 R
ole and responsibility descriptions

a
ccurately

portray
ing

staff
responsibilities
.

2.4 Identify
staff
responsible for
implementing

specific
measures in
the SSMP
.

✔



No Gap Identified

2.5 I
dentify the Chain of
Communication

for

reporting

SSOs,
accurate
ly

and u
p to date.

✔

Effectiveness

Element

2 Element

is effective with the update of role titles, names, and org chart. See Recommendations.

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Table 1. SSMP Gap Analysis

Requirement

WDR Compliance Gap

Comments/
Recommendations

Changes

to SSMP
Required

ELEMENT 3
–

LEGAL AUTHORITY

3.1 Prevent illicit discharges from I&I,
unauthorized stormwater,
chemical, and debris.

✔



No Gap Identified. Link is still functional.

3.2 Collaborate with storm sewer
agencies to coordinate emergency
spill response, prevent
unintentional cross connections.

✔

3.3 Require that sewers and
connections be properly designed
and constructed?

✔

3.4 Ensure access for maintenance,
inspection, or repairs for portions of
the lateral owned or maintained by
City?

✔

3.5 Enforce any
violation

of its sewer
ordinances.

✔

3.6 (If applicable) Obtain easement
accessibility agreements for locations
requiring sewer system operations
and maintenance.

✔

Effectiveness of Element 3

Element

is effective.

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Table 1. SSMP Gap Analysis

Requirement

WDR

Compliance

Ga
p

Comments
/Recommendations

Changes

to
SSMP
Required

ELEMENT

4 –

OPERATIONS

AND

MAINTENANCE

PROGRAM

The Plan must include the items listed below that are appropriate and applicable to the

Enrollee’s system.

4.1 Mapping

Are the City’s sanitary
sewer system maps complete,
current, and
sufficiently detailed
(including gravity lines, manholes,
pumping facilities, pressure pipes,
valves, and applicable storm
facilities within sewer service
boundaries)

I
nclude procedures for maintaining
and providing the Regional Water
Board with access.



The City maintains GIS maps of the wastewater collection system but would benefit from establishing a formal map update process.



Maps should be updated if any changes since 2019.



Include procedures for providing the Board with access to the maps (e.g., posted on City website, digital or hard copies that can be delivered if requested).

Include information on implementation
of formal map update procedures;
procedures to provide the Water Board
access to the maps.

4.2 Preventative Maintenance

Description of scheduling system,
and data collection system for
preventive O&M activities
conducted by staff and contractors.



Formal scheduling system not currently in place. Historical maintenance activities are not documented in SSMP.

Recommend including historical maintenance activities and establish a system for scheduling maintenance.



Recommend including narrative of maintenance performed. For example: Flushing of the Entire system and CCTV was completed in 2018. Quarterly inspections and hotspot maintenance are also performed.



Recommend including updates to I&I program if there are any.

Include narrative on formal
maintenance scheduling or recent large
maintenance items performed. Or
alternatively link to an external
appendix, or other
database where
these are stored.

4.3 Training

In house and external
training provided on regular basis
for O&M staff.



Recommend holding trainings on a regular basis and logging training events for O&M staff.

4.4 Major Equipment

Equipment
Inventory of sewer system
equipment, including identification
of critical replacement and spare
parts.

✔



No Gap
Identified. Update list if needed.

Effectiveness

Element

4 Element
needs

to be expanded and updated. See recommendations.

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Table 1. SSMP Gap Analysis

Requirement

WDR

Compliance

Gap

Comments
/Recommendations

Changes

to
SSMP
Required

ELEMENT

5 –

DESIGN

AND

PERFORMANCE

PROVISIONS

The Plan must include the following items as appropriate and applicable to the

Enrollee’s system:

5.1 Does the SSMP contain current
design

and

construction

standards
for the installation of new sanitary
sewer

systems,

pump

stations

and
other appurtenances and for the
rehabilitation

and

repair

existing
sanitary sewer systems?

✔



No Gap Identified. Links are still functioning.

5.2 Does the SSMP document current
procedures and standards for
inspecting

and

testing

the

installation of new sewers, pumps,
and other appurtenances and for
rehabilitation and repair projects?

✔

Effectiveness

Element

5 Element is effective.

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Table 1. SSMP Gap Analysis

Requirement

WDR Compliance

Gap

Comments/Recommendations

Changes

to SSMP
Required

ELEMENT

6 –

SPILL

EMERGENCY

RESPONSE

PLAN

(SERP)

The Spill Emergency Response Plan must include procedures to:

6.1 Notify primary responders, appropriate local officials, and regulatory agencies of a spill in a timely manner.

✔



No Gap Identified. Recommend
reviewing efficacy with field staff

6.2 Notify other affected entities (i.e. health agencies, water suppliers, etc.) of spills that affect public health, or waters of the State.

✔

6.3 Comply with
notification, monitoring, and reporting requirements.

✔

6.4 Ensure appropriate staff and contractors implement SERP are appropriately trained.

✔

6.5 Address emergency system operations, traffic control, and other response activities.

✔

6.6 Contain spill and prevent/minimize discharge to waters of the state or drainage conveyance systems.

✔

6.7 Minimize public health impacts and adverse impacts on beneficial uses of waters of the State.

✔

6.8 Remove sewage from the drainage
conveyance system.

✔

6.9 Clean spill area and drainage conveyance system in a manner that does not inadvertently impact beneficial uses in receiving waters.

✔

6.10 Implement technologies, practices, equipment, and interagency coordination to expedite containment and recovery.

✔

6.11 Implement pre
-
planned coordination and collaboration with storm drain agencies, and other utility agencies and departments prior, during, and after a spill event.

✔

6.12 Conduct post
-
spill
assessments of spill response activities

✔

6.13 Document and report spill events as required

✔

6.14 Annually review and assess effectiveness of the SERP and update as needed

✔

Effectiveness

Element

6 Element is effective. However, copy of SSMP linked on website should be updated to include

2023 SERP updates.

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Table 1. SSMP Gap Analysis

Requirement

WDR

Compliance

Gap

Comments/Recommendations

Changes

to SSMP
Required

ELEMENT

7 –

SEWER PIPE BLOCKAGE CONTROL PROGRAM

SSMP must include procedures for the evaluation of the Enrollee’s service area to determine whether a sewer pipe blockage con trol
program is needed to control fats, oils,
grease, rags
,

and debris. If the Enrollee determines that a program is not needed, the Enrollee shall provide justification in its Plan for

why a program is not needed. The
procedures must include, at minimum:

7.1 Implementation plan and schedule
for public education and outreach
program.

✔



No Gap Identified

7.2 A plan and schedule for disposal of
pipe
-
blocking substances.

✔

7.3 Legal authority to prohibit
discharges,

and identify measures
to prevent spills and blockages.

✔

7.4 Grease removal device
requirements including; installation,
design standards, maintenance,
BMP, recordkeeping and reporting
requirements.

✔

7.5 Authority to inspect grease
producing facilities, enforcement
authorities, and whether sufficient
staff exist to inspect and enforce
FOG ordinance.

✔

7.6 Identification of sanitary sewer
system sections subject to FOG, and
establishment of cleaning schedule.



Update list of
FOG Hot Spots.

Update list of FOG hot spots to reflect
current locations.

7.7 Implementation of source control
measures for all sources of FOG
reaching the sanitary sewer system.
✔



No Gap Identified

Effectiveness

Element

7 Element

is effective if updates are made. See Recommendations.

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Table 1. SSMP Gap Analysis

Requirement

WDR

Compliance

Gap

Comments/Recommendations

Changes

to SSMP
Required

ELEMENT

8 –

SYSTEM

EVALUATION
,

CAPACITY

ASSURANCE

PLAN AND

CAPITAL IMPROVEMENTS

SSMP must include procedures and activities for: Routine evaluation and assessment of system conditions, capacity assessment and design criteria, prioritization of corrective
actions, and a capital improvement plan:

8.1 Routine evaluation and
assessment of system conditions.

Identify hydraulic deficiencies.



2008 Master Plan documented CIP; no updates since due to resource constraints.



When next Master Plan is developed, recommend prioritizing a hydraulic
evaluation considering increased storm frequency and
use to assist with CIP prioritization.

Provide update on CIP (since 2008 Master
Plan)

8..2

Capacity assessment and design
criteria. Consider storm frequency
increases due to climate change.

8.3 Capital improvement plan
including prioritization of
corrective actions.

Effectiveness

Element

8 Element

is effective if updates are made. See Recommendations.

ELEMENT

9 –

MONITORING,

MEASUREMENT,

AND

PROGRAM

MODIFICATIONS

SSMP should
include an adaptive management section to address plan
-
implementation effectiveness and the steps for necessary plan improvement including the following:

9.1 SSMP should accurately portray
the methods of maintaining and
tracking relevant
information that
can be used to establish and
prioritize appropriate SSMP
activities.

✔



No Gap Identified

Update data in SSO tables (to 2024)
–

see Effectiveness section of this report.

9.2 Sufficiently evaluate the
effectiveness of SSMP elements
and PM
program based on
relevant information.

✔



No Gap Identified

9.3 Identify and illustrate SSO trends
including frequency, location, and
volume.



Data in tables and figures is out of date, recommend updating regularly on a yearly, or semi
-
yearly basis as possible.

Effectiveness

Element

9 Element is effective if updates are made. See Recommendations.

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Table 1. SSMP Gap Analysis

Requirement

WDR

Compliance

Gap

Comments/Recommendations

Changes

to SSMP
Required

ELEMENT

10 –

SSMP

PROGRAM

AUDITS

SSMP should include internal audit procedures, appropriate to the size and performance of the system and answer the following :

10.1 Have SSMP Audits been
completed? Audits must occur
within six months after the end of
the required 3
-
year audit period.

Audit reports must be kept on file.

✔



Completion of this audit will satisfy the 3
-
year audit
requirement period ending August 2024.

Audit will be attached
to the SSMP in the appendices.

Attach this audit to the next SSMP
update document.

10.2 Has a schedule been established to
address any compliance issues
found in the previous Audit(s).

✔



No gap identified.

Effectiveness of
Element

10 Element

is effective.

ELEMENT

11 –

COMMUNICATION

PROGRAM

SSMP must include procedures to communicate with the public and satellite systems.

11.1 Does the City effectively
communicate with the public and
other agencies
about the
development and implementation
of the SSMP and continue to
address any feedback?



SSMP available on the City website is out of date and does not reflect the most current 2023 SSMP updates.

Update the file on the City website to
most
current SSMP.

Effectiveness

Element

11 Element

is effective if updates are made. See Recommendations.

Sewer System Management Plan

2024 SSMP Audit Report

N
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C
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682 CITY OF HERCULES
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40 -
23 -
04 -
WP
-
2024

11 C
ity of Hercules

August 2024

EFFECTIVENESS

EVALUATION

Performance indicators
developed in the 2019 SSMP Update (Section IX: Monitoring, Measurement, and Program Modifications) were used to measure the performance of the wastewater collection system and the effectiveness of the SSMP. Performance indicator metrics were retrieved from

the California Integrated
Water Quality System (CIWQS) online database. Selected performance indicators are listed below. Historical results for the past ten years (2014 through June 2024) are presented in the following sections.

1. Total

number

SSOs

per

year

2. SSO

Rate

(number

per

100

miles

per

year)

3. Number

SSOs

cause

(roots,

grease,

debris,

structural

failure,

capacity,

pump station
failure, and other)

Total Number of SSOs per Year

Figure 1 presents the trend in total number of SSOs per year, by category. SSOs have remained infrequent with an average of 1 per year based on data from 2014 -
2024.

Figure 1
–

SSOs Per Year

Sewer System Management Plan

2024 SSMP
Audit Report

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C
ity of Hercules

August 2024

SSO Rate

Figure 2 presents the trend in SSO rate. The SSO rate per 100 miles of gravity main has remained relatively
unchanged because the length of gravity mains has not changed significantly and the number of SSOs per year is low. The City’s average SSO rate of 1.32 is below the Region 2 average rate of 3.95 SSOs per 100 miles of gravity main (Fiscal Year 20
22 -
23)
2 .

Figure 2
–

SSOs Per 100 Miles of Gravity Main

2 California Water Boards’ Annual Performance Report
–

Fiscal Year 202
2 -
2 3

https://www.waterboards.ca.gov/about_us/performance_report_2223/index.html

Sewer System Management Plan

2024 SSMP
Audit Report

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C
ity of Hercules

August 2024

Number of SSOs by Cause

Table
2 presents the SSOs by cause for each year.

Grease

and
pump station failures

have historically
accounted for the greatest portion of the City’s SSOs. The City has an ongoing FOG program and
participates in the Contra Costa Clean Water Program, which conducts FOG inspections at food service establishments within the City. Pump station failures have occurred at a privately owned and operated lift station that contributes flow in
to the City’s collection system, resulting in SSOs within the City’s system.

Table

2. SSOs by Cause

Calendar Year

Roots

Debris

Grease

Capacity

Structural
Failure

Vandalism

Pump
Station
Failure

Total

2014

1 1

0 0

0 2

2015

0 0

2016

0 0

2017

0 0

1 0

0 0

0 1

2018

0 0

2019

0 0

2 2

2020

0 0

1 0

0 0

0 1

2021

0 1

0 0

0 1

2022

0 0

1 0

0 0

1 2

2023

0 0

2024

0 0

Total

1 2

3 0

0 0

3 9

SSMP Revision Log

Appendix H

Sanitary Sewer Management Plan
Updates and Revision Log

1 City of Hercules
May 2026

Appendix H. SSMP Revision Log
Date SSMP Element Description of Change/Revision Made Person Authorizing Change

Sanitary Sewer Management Plan
Updates and Revision Log

2 City of Hercules
May 2026

Appendix H. SSMP Revision Log
Date SSMP Element Description of Change/Revision Made Person Authorizing Change

Sanitary Sewer Management Plan
Updates and Revision Log

3 City of Hercules
May 2026

Appendix H. SSMP Revision Log
Date SSMP Element Description of Change/Revision Made Person Authorizing Change

Concord Phoenix
1001 Galaxy Way, Suite 310
Concord CA 95420
925-949-5800
4505 E Chandler Boulevard, Suite 265
Phoenix AZ 85048
602-337-6110
Davis Pleasanton
2020 Research Park Drive, Suite 100
Davis CA 95618
530-756-5905
6800 Koll Center Parkway, Suite 150
Pleasanton CA 94566
925-426-2580
Irvine Sacramento
25 Edelman, Suite 120
Irvine, CA 92618
949-420-3030
100 Howe Avenue, Suite 110S
Sacramento CA 95825
916-306-2250
Lake Oswego San Diego
5 Centerpointe Drive, Suite 130
Lake Oswego OR 97035
503-451-4500
11545 West Bernardo Court, Suite 209
San Diego CA 92127
858-505-0075
Medford Santa Rosa
3235 Hillcrest Park Drive, Suite 106
Medford OR 97504
458-299-0843
2235 Mercury Way, Suite 105
Santa Rosa CA 95407
707-543-8506
Oceanside
804 Pier View Way, Suite 100
Oceanside CA 92054
760-795-0365

Hercules City CouncilSeptember 8, 2026

Hercules City Council
September 8, 2026