Sewer System Management Plan — Gonzales City Council, November 6, 2023

City of Gonzales
Wastewater Collection
Sewer System Management Plan 2023

TABLE OF CONTENTS
2023 REVISION OF SEWER SYSTEM MANAGEMENT PLAN

1. INTRODUCTION

2. DEFINITION OF TERMS

3. BACKGROUND

4. SSMP ELEMENTS
Section I. Mission, Goals and Objectives
Section II. Organization
Section III. Legal Authority
Section IV. Operation and Maintenance Program
Section V. Design and Construction Standards
Section VI. Overflow Emergency Response Plan
Section VII. Fats, Oils, and Grease (FOG) Control Program Section VIII. Capacity Management
Section IX. Monitoring, Measurement, and Program Modifications Section X. SSMP Program Audits
Section XI. Communication Program

5. Appendices
• Annual Report Information Requirements
• Sewer Spill Emergency Response Plan and Workbook
City of Gonzales

1. INTRODUCTION
Sewer System Management Plan Development and Implementation To facilitate adequate local funding and management of its sanitary sewer system(s), the State has mandated that the City develop and implement an updated Sewer System Management Plan. The scale and complexity of the Sewer System Management Plan, and specific elements of the Plan, must match the size, scale, and complexity of the City’s sanitary sewer system(s).

The Sewer System Management Plan must address, at minimum, the required Plan elements in of the State’s related General Order. To be effective, the Sewer System Management Plan must include procedures for the management, operation, and maintenance of the sanitary sewer system(s). The procedures must:
a. Incorporate the prioritization of system repairs and maintenance to proactively prevent spills.
b. Address the implementation of current standard industry practices through available equipment, technologies, and strategies.
c. Maintaining or improving the condition of the collection system infrastructure to provide reliable service into the future.
d. Cost-effectively minimizing infiltration/inflow (I/I) and provide adequate sewer capacity to accommodate design storm flows.

In 2006 the State Water Resources Control Board (SWRCB) originally issued Order 2006-0003- DWQ which required all entities operating wastewater collection systems to have a State approved Sewer System Management Plan (SSMP).

On December 6, 2022, the SWRCB adopted Waste Discharge Requirement ORDER WQ 2022- 0103-DWQ STATEWIDE WASTE DISCHARGE REQUIREMENTS GENERAL ORDER FOR SANITARY SEWER SYSTEMS which amended and replaced the provisions in the order 2006- 0003 DWQ. This new order went into effect on June 5, 2023, and all State entities are required to update the existing SSMPs to be in compliance with this new order. The City created an SSMP in 2012. This document is a major revision to the 2012 SSMP and will bring the City into compliance with the newly adopted WQ 2022-0103-DWQ Statewide General Order.

In addition, within six (6) months of the Adoption Date (June 5, 2023) of the State’s General Order:
• The City’s designated Legally Responsible Official(LRO) must upload the City’s updated Sewer System Management Plan to the online CIWQS Sanitary Sewer System Database.
• While uploading the SSMP the Legally Responsible Official is certifying the SSMP update and implementation.
• The City must update and implement its Spill Emergency Response Plan. • The Legally Responsible Official may designate one or more individuals as a Data Submitter for reporting of spill data. The Legally Responsible Official shall authorize the designation of Data Submitter(s) through the online CIWQS database (https://ciwqs.waterboards.ca.gov) prior to the individuals establishing a CIWQS user account (https://ciwqs.waterboards.ca.gov/ciwqs/newUser.jsp) and entering spill data into the online CIWQS Sanitary Sewer System Database.
• The City shall submit an Annual Report (previously termed as Collection System Questionnaire in Order 2006-0003-DWQ). See addendum to report for requirements of the annual report.
• The SSMP must be audited every three years and a complete revision must be done every six years.
• Starting on July 1, 2025, and no later than December 31, 2025, the city must submit an electronic sanitary sewer system service area boundary map with a geospatial data detailing the locations of the City’s sanitary sewer system service area boundary, for each system identified by a waste discharge identification (WDID) number. A disadvantaged community that may need assistance developing an electronic map to comply with this requirement, may contact State Water Board staff for assistance at [email protected].
• Sewer System Management Plan Availability - The City’s updated Sewer System Management Plan must be maintained for public inspection at the City’s offices and facilities and must be available to the public through CIWQS and/or on the City’s website, in accordance with the State’s requirements.

2. DEFINITION of TERMS
Annual Report - An Annual Report (previously termed as Collection System Questionnaire in Order 2006-0003-DWQ) is a mandatory report in which the Enrollee provides a calendar-year update of its efforts to prevent spills.

Best Management Practices (BMP) – Best management practices (BMPs) are methods that have been determined to be the most effective and practical means of preventing or reducing sanitary sewer overflows to help achieve water quality goals. BMPS include measures to prevent fats, oils, grease, roots, and other materials from clogging sewer pipes.

California Emergency Management Agency (Cal EMA) – Refers to the agency responsible for overseeing and coordinating emergency preparedness, response, recovery, and homeland security activities within the state. The agency was created in 2008, superseding both the Office of Emergency Services (OES) and Office of Homeland Security (OHS).

Calendar Year (CY)
California Integrated Water Quality System (CIWQS) – Refers to the State Water Resources Control Board online electronic reporting system that is used to report SSOs, certify completion of the SSMP and provide information on the sanitary sewer system.

Capital Improvement Program (CIP) – Refers to the document that identifies planned capital improvements to the District’s sanitary sewer system.

Certification of SSO Reports – The SWRCB requires the Legally Responsible Official (LRO, defined below) to login to CIWQS within a given time period to electronically sign submitted reports thereby stating that to the best of his/her knowledge and belief, the information submitted is true, accurate, and complete.

Closed Circuit Television (CCTV) – Refers to the process and equipment that is used to internally inspect the condition of gravity sewers.

County Health – Refers to the Santa Clara County Public Health Department Data Submitter - A Data Submitter is an individual designated and authorized by the Enrollee’s Legally Responsible Official to enter spill data into the online CIWQS Sanitary Sewer System Database. A Data Submitter does not have the authority of a Legally Responsible Official to certify reporting entered into the online CIWQS Sanitary Sewer System Database.

Disadvantaged Community - A disadvantaged community is a community with a median household income of less than eighty percent (80%) of the statewide annual median household income. With regards to the States’ General Orders, there is no differentiation between a small and large disadvantaged community.

Environmental Protection Agency (EPA) – Refers to the United States Environmental Protection Agency
Fats, Oils, and Grease (FOG) – Refers to fats, oils, and grease typically associated with food preparation and cooking activities that can cause blockages in the sanitary sewer system.

First Responder – Refers to the District employee who provides the District’s initial response to a sewer system alarm, emergency, or other event.

Field Report – Refers to the Sanitary Sewer Overflow Report, a document used to provide the basis for entering an overflow report into CIWQS.

Fiscal Year (FY)
Force Main – Refers to a pressure sewer used to convey wastewater from a pump station to the point of discharge.

Gallons per Acre per Day (GPAD)
Gallons per Day (gpd)
Gallons per Minute (gpm)
General Waste Discharge Requirements (GWDR) – Refers to the State Water Resources Control Board ORDER WQ 2022-0103-DWQ STATEWIDE WASTE DISCHARGE REQUIREMENTS GENERAL ORDER FOR SANITARY SEWER SYSTEMS. This Order was adopted by the State Water Resources Control Board on December 6, 2022. This Order shall become effective 180 days after the Adoption Date of this General Order on June 5, 2023. The City must comply with the requirements of this Order upon the Effective Date.

Geographic Information System (GIS) – Refers to the City’s system that it uses to capture, store, analyze, and manage geospatial data associated with the City’s sanitary sewer system assets.

Global Positioning System (GPS) – Refers to the handheld unit used to determine the longitude and latitude of sanitary sewer overflows for use in meeting the CIWQS Online SSO Reporting System reporting requirements. Google maps can be used in lieu of a GPS unit to obtain this information.

House Connection Sewer (Upper Lateral) – Refers to that portion of the horizontal sewer piping from the building or structure to the property line of the public right of way or easement.

Infiltration/Inflow (I/I) – Refers to water that enters the sanitary sewer system from storm water and groundwater that increases the quantity of flow. Infiltration enters through defects in the sanitary sewer system after flowing through the soil. Inflow enters the sanitary sewer system 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 sewer service lateral.

Legally Responsible Official (LRO) – Refers to the individual who has the authority to certify reports and other actions that are submitted through the Online SSO Reporting System.

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

Millions of Gallons per Day (MGD)
Monitoring, Measurement, and Program Modification (MMPM) National Pollutant Discharge Elimination System (NPDES) Not Applicable (NA)
Notification of an SSO – Refers to the time at which the District becomes aware of an SSO event through observation or notification from the public or other source.

Office of Emergency Services (OES) – See California Emergency Management Agency Online SSO Reporting System – Refers to the California Integrated Water Quality System (CIWQS) Operations and Maintenance (O&M) Overflow Emergency Response Plan (OERP) Pipeline Assessment and Certification Program (PACP) – Refers to the program developed by the National Association of Sewer Service Companies (NASSCO) for standardizing sewer pipe condition evaluation and reporting results of CCTV inspections.

Preventive Maintenance (PM) – Refers to the maintenance activities intended to prevent failures of the sanitary sewer system facilities (e.g., cleaning, CCTV, inspections) Private Lateral Sewage Discharges – Sewage discharges that are caused by blockages or other problems within a privately owned sewer service lateral.

Property Damage Overflow – Property damage overflows refers to a sewer overflow or backup that damages private property.

Public Sewer – As stated in the District Operations Code, this refers to any mainline sewer constructed in any street, highway, alley, place or right of way dedicated for public use.

Regional Water Quality Control Board (RWQCB) – Refers to the Regional Water Quality Control Board – Region 3
Sanitary Sewer Overflow (SSO) – Any overflow, spill, release, discharge, or diversion of untreated or partially treated wastewater from a sanitary sewer system. SSOs include:

1. Overflows or release of untreated or partially treated wastewater that reach waters of the United States.

2. Overflows or release of untreated or partially treated wastewater that do not reach waters of the United States and.

3. Wastewater backups into buildings and on private property that are caused by blockages or flow conditions within the publicly owned portion of a sanitary sewer system.

Sanitary Sewer System – Refers to the portion of the sanitary sewer facilities that are owned and operated by the City of Gonzales. The sanitary sewer system consists of collection sewers, trunk sewers, and pressure sewers (force mains).

Sensitive Area – Refers to areas where an SSO could result in a fish kill or pose an imminent or substantial danger to human health (e.g., parks, aquatic habitats, etc.).

Sewer Service Lateral – For the purposes of this SSMP, the sewer service lateral includes both the upper lateral (house connection sewer) and the lower lateral (sewer lateral).

Sewer Lateral (Lower Lateral) – Refers to the portion of the pipe between the house or building on private property and the sewer main, including the connection to the sewer main.

The property owner is responsible to repair any failure or damage in the sewer lateral, including the connection to the sewer main; unless it is determined that another party caused the failure or damage.

Sewer System Management Plan (SSMP)
Standard Operating Procedures (SOP) – Refers to written procedures that pertain to specific activities employed in the operation and maintenance of the sanitary sewer system.

State Water Resource Control Board (SWRCB) – Refers to the California Environmental Protection Agency (EPA) State Water Resources Control Board and staff responsible for protecting the State’s water resources.

Surface Waters – Public (State or Federal) water bodies such as rivers, streams, reservoirs, estuaries, lagoons, bays, and ocean waters. Note: All SSO that enter a system (such as storm drains or storm sewers) which conveys stormwater to surface waters are considered having reached surface waters minus any quantity recovered (volume captured) from the storm drain or sewer. Also see (Waters of the State).

Trunk Sewer or Main Interceptor System – The terms trunk sewer, gravity trunk line, and main interceptor sewer are used interchangeably to refer to the main branches of the sanitary sewer system, which carry flows from the collector sewers to the treatment plant.

Volume Captured – The amount of spilled sewage that is returned to the sanitary sewer system. When recording the volume that is captured, the volume of water used for flushing and/or cleaning should not be included.

Water Body – A water body is any stream, creek, river, pond, impoundment, lagoon, wetland, or bay.

Waters of the State – Waters of the State means any water, surface or underground, including saline waters, within the boundaries of California. In case of a sewage spill, storm drains are considered to be waters of the State unless the sewage is completely contained and returned to the sanitary sewer system and that portion of the storm drain is cleaned.

Waste Discharger Identification Number(WDID) - The facility identification number or WDID number is the number the SWRCB gives each permittee. Consider it the City’s facility account number with the SWRCB.

Work Order (WO) – Refers to the document (paper or electronic) that is used to assign work and to record the results of the completed work.

3. BACKGROUND
The City of Gonzales (City) is in Monterey County, California, approximately 16 miles southeast of Salinas. The mean elevation for the city is 130 feet above sea level. The City of Gonzales is situated in the heart of the Salinas Valley along Highway 101. The City is approximately 340 miles north of Los Angeles, 115 miles south of San Francisco, 70 miles south of San Jose, 16 miles south of Salinas, and 35 miles inland from Monterey Bay. The City’s size is approximately

1.4 square miles.

The City has a current population of approximately 8,650 residents. The City’s residential, commercial, and industrial wastewater customers are currently served by a wastewater treatment plant (WWTP) located at the end of Short Road, approximately 2 miles west of the intersection of South Alta Road and Gonzales River Road. The City is home to the Gonzales Agricultural Business Industrial Park (GABIP), which is a 75-acre area bounded by South Alta Road to the east, Gonzales River Road to the south, and agricultural land to the north and west.

It hosts several agricultural processing businesses, and an additional 25 acres are planned to be added in the near future. The businesses in the GABIP are a main source of increased wastewater flows, and the City is aware of additional business interest in the GABIP.

Gonzales is the center of Salinas Valley production and distribution of vegetables that feed the world.

4. SSMP ELEMENTS
Section I. Mission, Goals and Objectives
State Resources Water Control Board (SWRCB) Waste Discharge Requirement The goal of the Sewer System Management Plan (SSMP) is to:
• Properly manage, operate, and maintain all parts of the City’s sanitary sewer system(s),
• Reduce and prevent spills, and
• Contain and mitigate spills that do occur.

In order to achieve these major goals, the City will develop and implement plans to do the following:

1. Develop spill and overflow response procedures, implement support systems, and train staff on support systems

2. Develop and track leading indicators

3. Update the City’s SSMP and implement an ongoing SSMP update schedule

4. Annually audit system assets

5. Upgrade wastewater collections SCADA system

6. Maintain updated system maps

7. Develop a formal Capital Improvement Program in order repair, refurbish and expand the City’s wastewater collection system.

8. Maintain the wastewater collection system through the City’s Operation and Maintenance Program.

9. Update the City’s Sewer Ordinance

10. Implement a formal Pretreatment Program

11. By the end of the 5-Year Capital Improvement Program implement regular and ongoing CCTV Inspections of the wastewater collection system.

Develop spill and overflow response procedures and train pertinent staff on the same. a. Develop Spill and Overflow Response Procedures by December 1, 2023. b. Annually conduct and document staff training on Spill and Overflow Response Procedures starting in 2024.
c. Procure and implement a Computer Maintenance and Management System (CMMS) in 2025-2026 fiscal year.
d. Geographic Information Systems (GIS)
• City collection system staff have GIS iPad
• City Sewer mains are in the GIS system.
• City staff take photos of repairs and improvements and update GIS system, as necessary.

Develop and track leading indicators. Leading indicators are a list of metrics of which indicate that the collection system is well operated. Common leading indicators used by utilities include customer service, maintenance and repair activities, sanitary sewer overflows, odor complaints, source control, data management and mapping, safety, and financial viability.

The City typically has 1 or 2 SSOs per year. Therefore, with so few SSO occurrences there is no need for arduous management practices and procedures to track metrics. The city will continually monitor SSO occurrences with the goal to conduct operational and maintenance activities such that there is no significant increase in the frequency or volume of SSOs.

Annually the City will record the following information related to the wastewater collection system and upload this information into the States’ California Integrated Water Quality System (CIWQS).

1. Number of SSOs per year

2. Total Volume of SSOs per year

3. Number of SSOs caused by roots

4. Number of SSOs caused by Fats, Oil and Grease (FOG)

5. Amount Sewer Cleaned feet per year

6. Amount Sewer Inspected by Close Circuit Television(CCTV) per year Capturing this data in CIWQS should provide the City with adequate metric tracking information.

Leading Indicators
Year # SSOs Total Vol
of SSOs
Cause -
Roots
Cause -
Grease
Cause -
Other
Sewer
Cleaned -
FT
Sewer
InspectedFT
2023
2024
2025
2026
2027
Collection system staff currently conduct semi-annual maintenance and inspections at known trouble spots in the collection system. Inspections are conducted:
• Immediately before the start wet weather season.
• Immediately after the end of wet weather season.
• Throughout the year, on 3 days per week, collection system staff inspect manholes in known trouble spot areas.
• With the acquisition of additional staffing and equipment over the next 5 years the City plans to conduct Closed Circuit Television Inspections of 12.5 % of the collection system each year such that the entire system is CCTV inspected every 8 years.

Sewer System Management Plan Update Schedule

1. Complete an update to SSMP by December 1, 2023

2. Upload SSMP to SWRCB website by December 5, 2023

3. Submit annual report to SWRCB by April 1 of each year beginning in 2024.

4. Submit Boundary map of service area to SWRCB by December 5, 2023, and annually update those maps when additional infrastructure is added to the system.

5. Submit an SSMP audit and other pertinent information to the online CIWQS Sanitary Sewer System Database by six (6) months after the end of the 3-year audit period (December 5, 2026).

6. Six (6) years (June 5, 2029) after the required due date of the last SSMP update the Legally Responsible Official shall upload and certify a local governing entity reviewed Sewer System Management Plan update. The update shall be uploaded and certified to the online CIWQS Sanitary Sewer System Database. If the electronic document format or size capacity prevents the electronic upload of the Plan, the Legally Responsible Official shall report an electronic link to its updated Sewer System Management Plan posted on its own website.

Sewer System Asset Overview
The City of Gonzales is in Monterey County, California. The mean elevation for the City is 130 feet above sea level. The City’s WWTP is served by a collection system consisting of gravity sewers, lift stations, and force mains. The WWTP consists of a headworks, influent pump station, a flow distribution structure, six facultative partially mixed lagoons, two polishing ponds, and three rapid infiltration basins.

The collection system consists of Vitrified Clay Pipe (VCP), PVC, and PVC force main pipes ranging in diameter from six to 21 inches. The Collection system consists of:
• Over 20.83 miles of sewer main
• 5 sewer lift stations
• 3 Pump Stations > 75,000 gallons/day
• 2 Pump Stations < 75,000 gallons/day
• 1.3 miles of force mains
• Peak daily flow in 2022 was 1.462 MGD
• Average Monthly Mean Flow in 2022 was 1.095 MGD
• 1,785 residential sewer connections
• 155 commercial sewer connections
• 40 industrial sewer connections
The City of Gonzales is not responsible for any private entities upper or lower laterals. The City is not aware of any structures that drain from a storm sewer to a sanitary sewer.

The current captial improvement plan(CIP) includes the construction of a new Industrial Wastewater Reclamation System and rehabilitation of the City’s WWTP. Major upgrades are needed to the City’s sewer system because the existing system is at full capacity. Additionally, the WWTP needs to be rehabilitated to meet the requirements under the new Water Board’s Waste Discharge Requirements issued to the City in April of 2023 Sewer System Asset Overview
Diameter of sewer pipe
Gravity Mainlines ( % ) Force Mains ( % )
6 inches or less 32 100
8 inches 41 0
9 - 18 inches 16 0
19 - 36 inches 11 0
> 36 0 0
Unknown Diameter 0 0
Totals 100 100

The new Industrial Wastewater Reclamation System is an approximately $25 million project which will be funded by State Revolving Fund (SRF) loan from the State Water Resources Control Board. Ratepayers will be responsible for the financing costs related to the annual loan payment. The facility will allow industrial wastewater to be treated separately from domestic wastewater.

The CIP also calls for additional funding to increase rehabilitation and inspections of the existing wastewater treatment plant and collection system.

Data Management Systems
The City has budgeted funds in the 2025-26 fiscal year to replace its existing Scada system. • The existing Scada system is beyond its useful life and needs replacement. • The existing Scada system is an obsolete proprietary system. • The City has a history of less than adequate manufacturer support for the existing Scada system.
• There are floats at all collection system pump stations monitored by the third-party vendor.
• The third-party vendor notifies the City’s Spill Response Personnel when alarms occur.

Updated Map of Sanitary Sewer System
The City’s wastewater collection system map records include schematic diagrams of the District’s collection system mains with references for users to as-built map sources. The City of Gonzales also maintains maps of the storm water sewer system.

The City maintains 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) via CIWQS. 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.
a. City collection system staff have GIS iPad
b. City Sewer mains are in the GIS system.
c. City staff take photos of repairs and improvements and update GIS system, as necessary.

Starting on July 1, 2025, and no later than December 31, 2025, the City must submit an electronic sanitary sewer system service area boundary map with a geospatial data detailing the locations of the City’s sanitary sewer system service area boundary, for each system identified by a waste discharge identification (WDID) number. A disadvantaged community that may need assistance developing an electronic map to comply with this requirement, may contact State Water Board staff for assistance at [email protected] Section II. Organization
SWRCB Waste Discharge Requirement
The SSMP must identify:
• The name of the responsible or authorized representative as described in Section J of the State’s SSMP WDR.
• The names and telephone numbers for management, administrative, and maintenance positions responsible for implementing specific measures in the SSMP program. The SSMP must identify lines of authority through an organization chart or similar document with a narrative explanation; and
• The chain of communication for reporting SSOs, from receipt of a complaint or other information, including the person responsible for reporting SSOs to the State and Regional Water Board and other agencies if applicable (such as County Health Officer, County Environmental Health Agency, Regional Water Board, and/or State Office of Emergency Services (OES)).

City Manager – Establishes policy, plans strategy, allocates resources, delegates responsibility, and may serve as public information officer.

Public Works Director/ City Engineer – Prepares wastewater collection system planning documents; manages capital improvement delivery system; documents new and rehabilitated assets; and coordinates development and implementation of SSMP. • City’s Legally Responsible Officer(LRO) for the Sanitary Sewer System • Conducts or authorizes verbal, electronic, and written reports related to SSOs.

Public Works Supervisor – Works as needed under the direction of the Public Works Director/City Engineer on applicable SSOs reporting and permit compliance and provides support to all parts of operations. Leads emergency response, investigates and reports SSOs, and trains field crews. Serves as an approved Data Submitter in CIWQS. Meets with field crews to oversee emergencies when contractors are involved and provides reports to the Public Works Director.

Field Crew (Lead Worker, Technician, Mechanic, Maintenance Worker)– Staff preventive maintenance activities, mobilize and respond to notification of stoppages and SSOs (mobilize sewer cleaning equipment, by-pass pumping equipment, and portable generators).

A. Facility
City of Gonzales Wastewater Collection System and WWTP
400 Short Rd
Monterey County
Gonzales, Ca. 93926
Public Works Department
P.O. Box 647, Gonzales, CA, 93926
B. Facility Owner
City of Gonzales
147 4th Street, Gonzales, Ca. 93926
C. Legally Responsible Officer
Patrick Dobbins, Public Works Director/City Engineer
The City’s authorized representative in all wastewater collection system matters. 831-675-5000
[email protected]
D. Wastewater Chief Plant Operator
Tiffany Twisselmann, Public Works Supervisor
831-776-2095
[email protected]
E. Lead Worker
Frank Valladarez, Lead Worker
831-737-5038
F. Staff Technician
G. Staff Mechanic
H. Maintenance Workers (8)
Chain of Communication
• Public Works Department - 831-675-5000*
• Afterhours/Holidays –
o * PWD message directs caller to contact non-emergency dispatch who will notify an on-call employee.
• Sewer Inspector is first responder to Sanitary Sewer Overflows (SSO) • Sewer Inspector calls response crew to site when necessary • Sewer Inspector fills out initial SSO form
• Public Works Supervisor
Section III. Legal Authority
SWRCB Waste Discharge Requirement
The City must demonstrate, through sanitary sewer system use ordinances, service agreements, or other legally binding procedures, that it possesses the necessary legal authority to:
• Prevent illicit discharges into its sanitary sewer system (examples may include infiltration and inflow (I/I), stormwater, chemical dumping, unauthorized debris and cut roots, etc.).
• Require that sewers and connections be properly designed and constructed. • Ensure access for maintenance, inspection, or repairs for portions of the lateral owned or maintained by the City.
• Limit the discharge of FOG and other debris that may cause blockages; and • Enforce any violation of its sewer ordinances.

The Publics Work Director/City Engineer is authorized to execute Legal Authority over the use, construction, services, permits, and procedures related to City’s wastewater collection system.

This authority is applicable to all industrial, business, or residential entities. The Gonzales City Code is Ordinance 2021-130.

A. Control of infiltration and inflow from satellite wastewater collection systems and laterals. a. Building Sewer Connection Requirements – Sewage Disposal, Chapter 10.16, section 070.
b. Sewer Use Regulation – Sewer Disposal, Chapter 10.16, Section 030 c. Permits and Fees – Sewage Disposal Chapter, 10.16, Section 060-100 B. Require Construction Design for new and rehabilitated sewer and connections:
a. Sewage Disposal, Chapter 10.16, Section 070.

C. Installation, Inspection and Testing of new and rehabilitated sewers and connections:
a. Sewage Disposal, Chapter 10.16, Section 070.

D. Pretreatment Ordinance - Sewer Disposal, Chapter 10.16, Section 030, E. a. Pretreatment By Owner: Whenever deemed necessary by the public works director, the owner of any private premises shall, at his own expense, provide such treatment or take such other measures as shall be required in order to reduce objectionable characteristics, contents or rate of discharge of waters or wastes being deposited in the sanitary sewer system so that the same may be received therein without any damage to the sanitary sewer system or any undue interference with its operation and without any hazard of any kind to humans or animals.

E. Interfering Substances - Sewer Disposal, Chapter 10.16, Section 030, Q. a. No person shall discharge, cause, allow or permit to be discharged into the sanitary sewer system or any part thereof, any industrial waste containing any of the following toxic substances exceeding the concentrations set forth below:

Toxic Substance
Standard Discharger
Maximum Allowable
Concentration
Low Flow Discharger
Maximum Allowable
Concentration
Antimony 5.0 mg/l 5.0 mg/l
Arsenic 1.0 mg/l 1.0 mg/l
Beryllium 0.75 mg/l 0.75 mg/l
Cadmium 0.7 mg/l 0.7 mg/l
Chromium, total 1.0 mg/l 1.0 mg/l
Copper 2.3 mg/l 2.7 mg/l
Cyanides 0.5 mg/l 0.5 mg/l
Lead 0.4 mg/l 0.4 mg/l
Mercury 0.010 mg/l 0.010 mg/l
Nickel 0.5mg/l 2.6 mg/l
Phenol and derivatives 30.0 mg/l 30.0 mg/l
Toxic Substance
Standard Discharger
Maximum Allowable
Concentration
Low Flow Discharger
Maximum Allowable
Concentration
Selenium 1.0 mg/l 1.0 mg/l
Silver 0.7 mg/l 0.7 mg/l
Zinc 2.6 mg/l 2.6 mg/l
The Public Works Director/City Engineer has primary responsibility for enforcement of the City Codes related to wastewater collection and treatment. The Public Works Director/City Engineer plans, coordinates and directs, through subordinate staff, the operations, engineering and construction programs, and the financial affairs related to wastewater collection and treatment; observes and enforces all laws, rules, and wastewater regulations. Oversees and manages the planning, design and construction of District wastewater facilities; reviews and approves developer dedicated facilities; develops, implements and manages the Capital Improvement Program (CIP); administers the District's planning, engineering, construction management, construction inspection, environmental compliance, and drafting and surveying functions; negotiates developer agreements; procures and manages consultants; performs a variety of difficult professional engineering and design activities including overseeing capital improvement projects; operates and controls operating and project budgets; manages industrial waste permitting and enforcement activities.

The City is currently collaborating with a consultant and is in the process of updating its existing a Pretreatment Program. Once the Pretreatment Program has been updated it will be incorporated into a new sewer ordinance. The City’s target date for completing the update to the pretreatment program and updating sewer ordinance is July of 2024.

Section IV. Operation and Maintenance Program
SWRCB Waste Discharge Requirement
The Sewer System Management Plan (SSMP) must include those elements listed below that are appropriate and applicable to the City’s system:
• Maintain an up‐to‐date map of the sanitary sewer system, showing all gravity line segments and manholes, pumping facilities, pressure pipes and valves, and applicable stormwater conveyance facilities.
• Describe routine preventive operation and maintenance activities by staff and contractors, including a system for scheduling regular maintenance and cleaning of the sanitary sewer system with more frequent cleaning and maintenance targeted at known problem areas. The Preventive Maintenance (PM) program should have a system to document scheduled and conducted activities, such as work orders. • Develop a rehabilitation and replacement plan to identify and prioritize system deficiencies and implement short‐term and long‐term rehabilitation actions to address each deficiency. The program should include regular visual and TV inspections of manholes and sewer pipes, and a system for ranking the condition of sewer pipes and scheduling rehabilitation. Rehabilitation and replacement should focus on sewer pipes that are at risk of collapse or prone to more frequent blockages due to pipe defects.

Finally, the rehabilitation and replacement plan should include a capital improvement plan that addresses proper management and protection of the infrastructure assets. The plan shall include a time schedule for implementing the short‐ and long‐term plans plus a schedule for developing the funds needed for the capital improvement plan. • Provide training on a regular basis for staff in sanitary sewer system operations and maintenance and require contractors to be appropriately trained; and provide equipment and replacement part inventories, including identification of critical replacement parts.

UPDATED MAP OF SANITARY SEWER SYSTEM
Starting on July 1, 2025, and no later than December 31, 2025, the city must submit an electronic sanitary sewer system service area boundary map with a geospatial data detailing the locations of the City’s sanitary sewer system service area boundary, for each system identified by a waste discharge identification (WDID) number. A disadvantaged community that may need assistance developing an electronic map to comply with this requirement, may contact State Water Board staff for assistance at [email protected].

Currently, the City’s sewer map records consist of maps based on the Sewer Master Plan that includes schematic diagrams of the City’s mains with references for users to as-built map sources. The City of Gonzales also maintains the storm water sewer maps.

The City must maintain 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. Currently, those City’s procedures are as follows:
a. City collection system staff have GIS iPads.
b. City Sewer mains are in the GIS system.
c. City staff take photos of repairs and improvements and update GIS system, as necessary.

PREVENTATIVE OPERATIONS AND MAINTENENANCE
High Priority Maintenance and Cleaning Process
Collection system staff currently conduct semi-annual maintenance and inspections at known trouble spots in the collection system. Inspections are conducted:
• Immediately before the start wet weather season.
• Immediately after the end of wet weather season.
• Throughout the year collection system staff inspect manholes in known trouble spot areas 3 days per week.
• With the acquisition of additional staffing and equipment over the next 5 years, starting in 2028 the City plans to conduct Closed Circuit Television Inspections of 12.5 % of the collection system each year such that the entire system is CCTV inspected every 8 years.

Structural Condition: The priority cleaning list revolves around the condition of the sanitary collection system. Cycles are determined by conditions and frequency of stoppages. Locations are removed from the list when repairs are completed, and stoppages have been eliminated.

Root Control: Currently the City does not have a significant issue with roots in the collection system. The cause of each SSOs is reviewed and the City plans implement and increase root control efforts as necessary to prevent SSOs.

Grease Conditions: Sewers with a history of repeated calls for grease stoppages are maintained at a frequency that is intended to prevent repeat stoppages or SSOs.

Prioritized Cleaning
The City identifies areas that require periodic sewer cleaning. All completed sewer cleaning is recorded and filed at the City corporation yard’s office.

Closed Circuit Television Inspection (CCTV)
The City currently conducts CCTV inspection on sewer mains on an as-needed basis. CCTV inspections are conducted as a follow-up to SSO events, identification of high frequency cleaning areas, and analysis of pipe segments that will be included in the upcoming Capital Improvement Program. All inspections are done in accordance with the NASSCO PACP standards. Data will be analyzed and stored in the City server system.

With the acquisition of additional staffing and equipment over the next 5 years the City plans to conduct Closed Circuit Television Inspections of 12.5 % of the collection system each year such that the entire system is CCTV inspected every 8 years.

Routine Maintenance and Cleaning Process
Is there an ongoing cleaning and inspection program? i.e., cleaning and CCTV (or other inspection) or every is all cleaning on an as needed basis?

REHABILITATION AND REPLACEMENT
In 2023 the City adopted a 5-Year Capital Improvement Plan which identified major improvements to the wastewater collection and treatment infrastructure. The City completes a Wastewater Master Plan every 5 to 7 years. In addition, the findings of periodic maintenance inspections identify expansion and refurbishment tasks that are needed. The City then budgets funds in the Operating and Maintenance or Capital Improvement budgets to complete those projects.
• In 2023 the city adopted a 5-year Capital Improvement Plan • The CIP includes the construction of a new Industrial Wastewater Reclamation System and rehabilitation of the City’s existing WWTP. Major upgrades are needed to the City’s sewer system because the existing system is at full capacity.

Additionally, the WWTP needs to be rehabilitated to meet the requirements under the new Waterboard WDR issued in April 2023.
• The proposed new Industrial Wastewater Reclamation System is an approximately $25 million project which will be funded by State Revolving Fund (SRF) loan from the State Water Resources Control Board. Ratepayers will be responsible for the financing costs related to the annual loan payment. The facility will allow industrial wastewater to be treated separately from domestic wastewater. • The CIP also calls for additional funding to increase rehabilitation and inspections of the existing wastewater collection system.
• Wastewater Collection System Master Plan
• In 2018 the City commissioned Dudek Engineering Consultant to prepare a Long-Term Wastewater Management Plan. The Long-Term Wastewater Management Plan (LTWMP) aggregated relevant information contained in the City’s previous studies to comply with the Regional Water Quality Control Board’s (RWQCB) request.
• The City’s current proposed capital improvement budget calls for a new Wastewater Master Plan to be completed in the 2024-25 fiscal year.

Inflow and Infiltration
Infiltration is considered to be extraneous water that enters the sewer system over longer periods of time, such as groundwater seepage through cracks in the sewer. Inflow is considered to be extraneous water that enters the system as a direct result of a rain event, such as through improper connections to the sanitary sewer, through flooded manhole covers, or through defects in the sewer. While it is impossible to control all I/I, it is certainly desirable to reduce I/I when cost-effective. I/I is considered excessive if it causes SSOs and/or dramatically increases pumping and treatment costs at the treatment plant.

Currently, the City has low Inflow and Infiltration. In 2022 peak day wastewater flow was 1.462 MGD and the average mean day wastewater flow was 1.082 MGD. The City is evaluating development of an Inflow and Infiltration (I&I) Reduction Program. The program is intended to rehabilitate portions of the sewer system where the groundwater, stormwater, and other sources of water enter the sewers. The City is not aware of any structures that drain from the storm to sanitary sewer.

Inventory Management
The City maintains a spill response trailer, Vactor Truck, Portable Standby Pumps and Generators which allows staff to quickly response to spills and overflows from the wastewater collection system. The City also maintains an adequate supply of repair parts and equipment necessary to complete repairs to the collection system.

The Public Works Director/City Engineer and the Public Works Supervisor participate in South Salinas Valley Public Works Managers(SSVPWM) group. The SSVPWM meets every other month to discuss mutual challenges Cities and agencies experience while managing and operating wastewater collection systems. The SSVPWM meetings also facilitate collaboration for mutual aid opportunities when one or more members are dealing with system emergencies.

STAFF TRAINING
Currently collection system staff receive annual training on the following equipment:
• Vactor Trucks
• Stand by Portable Pumps
• Portable Generators
• Spill Response Trailer
Training records are maintained at the City’s corporation yard.

Starting in the year 2024 the City plans to annually conduct the following staff training:
• Spill Response Procedures for City Staff
• Spill Volume Estimation Training
• Training on CIWQS for appropriate City staff
• Training on Spill Failure Analysis
• Training on SSMP Auditing
• Traffic Control
• Spill and Response Procedures for contractors will be conducted on an as needed basis. • Annually the City will review sampling procedures with the Monterey County Health Department
• This training will be documented, and training records will be kept at the City’s corporation yard.

Section IV. Major Equipment
The City owns:
• Vactor Truck
• Standby Portable Pumps
• Standby Generators
• Spill Response Trailer
Section V. Design and Construction Standards
SWRCB Waste Discharge Requirement
• Design and construction standards and specifications for the installation of new sanitary sewer systems, lift stations and other appurtenances; and for the rehabilitation and repair of existing sanitary sewer systems; and • Procedures and standards for inspecting and testing the installation of new sewers, pumps, and other appurtenances and for rehabilitation and repair projects.

The Publics Work Director/City Engineer is authorized to execute Legal Authority over the use, construction, services, permits, and procedures related to City’s wastewater collection system.

This authority is applicable to all industrial, business, or residential entities. The City is currently collaborating with a consultant and is in the process of updating its existing a Pretreatment Program. Once the Pretreatment Program has been updated it will be included in a new sewer ordinance. The City’s target date for completing the update to the pretreatment program and updating sewer ordinance is July of 2024.

The City’s existing sewer ordinance 2021-130 contains the following provisions.

A. Control of infiltration and inflow from satellite wastewater collection systems and laterals.

Building Sewer Connection Requirements – Sewage Disposal, Chapter 10.16, section 070.

The Publics Work Director/City Engineer is authorized to execute Legal Authority over the use, construction, services, permits, and procedures related to City’s wastewater collection system.

This authority is applicable to all industrial, business, or residential entities. Control of infiltration and inflow from satellite wastewater collection systems and laterals. a. Building Sewer Connection Requirements – Sewage Disposal, Chapter 10.16, section 070.
b. Sewer Use Regulation – Sewer Disposal, Chapter 10.16, Section 030 c. Permits and Fees – Sewage Disposal Chapter, 10.16, Section 060-100 B. Require Construction Design for new and rehabilitated sewer and connections:
a. Sewage Disposal, Chapter 10.16, Section 070.

C. Installation, Inspection and Testing of new and rehabilitated sewers and connections:
a. Sewage Disposal, Chapter 10.16, Section 070.

D. Pretreatment Ordinance - Sewer Disposal, Chapter 10.16, Section 030, E. a. Pretreatment By Owner: Whenever deemed necessary by the Public Works Director, the owner of any private premises shall, at his own expense, provide such treatment or take such other measures as shall be required in order to reduce objectionable characteristics, contents or rate of discharge of waters or wastes being deposited in the sanitary sewer system so that the same may be received therein without any damage to the sanitary sewer system or any undue interference with its operation and without any hazard of any kind to humans or animals.

Sewer Use Regulation – Sewer Disposal, Chapter 10.16, Section 030 Permits and Fees – Sewage Disposal Chapter, 10.16, Section 060-100 B. Require Construction Design for new and rehabilitated sewer and connections:
a. Sewage Disposal, Chapter 10.16, Section 070.

C. Installation, Inspection and Testing of new and rehabilitated sewers and connections:
a. Sewage Disposal, Chapter 10.16, Section 070.

D. Pretreatment Ordinance - Sewer Disposal, Chapter 10.16, Section 030, E.

Pretreatment By Owner: Whenever deemed necessary by the Public Works Director, the owner of any private premises shall, at his own expense, provide such treatment or take such other measures as shall be required in order to reduce objectionable characteristics, contents or rate of discharge of waters or wastes being deposited in the sanitary sewer system so that the same may be received therein without any damage to the sanitary sewer system or any undue interference with its operation and without any hazard of any kind to humans or animals.

A. Pursuant to the general laws of the state, the city council declares its intention to own, construct, equip, operate and maintain within or without the city limits, a sewage disposal plant or plants, sewers, equipment and appurtenances necessary, useful or convenient for a complete sewer system and disposal plant, and also including the reconstruction of such sewers as may necessarily or conveniently be deemed proper by the council.

B. For the protection of the public health, safety and general welfare, the city council declares its intention to regulate the generation and discharge of all wastewaters from all domestic, commercial, and industrial sources. (1972 Code § 13.12.010) As noted above the sewer ordinance contains procedures for operating, testing and inspection of new and refurbished equipment added to the sewer or sewer pretreatment systems.

Section VI. Overflow Emergency Response Plan
SWRCB Waste Discharge Requirement
Each Enrollee shall develop and implement an Overflow Emergency Response Plan (OERP) that identifies measures to protect public health and the environment. At a minimum, this plan must include the following:
• Proper notification procedures so that the primary responders and regulatory agencies are informed of all SSOs in a timely manner.
• A program to ensure an appropriate response to all overflows. • Procedures to ensure prompt notification to appropriate regulatory agencies and other potentially affected entities (e.g., health agencies, Regional Water Boards, water suppliers, etc.) of all SSOs that potentially affect public health or reach the waters of the State in accordance with the Monitoring and Reporting Program (MRP).

All SSOs shall be reported in accordance with this MRP, the California Water Code, other State Law, and other applicable Regional Water Board WDRs or NPDES permit requirements. The SSMP should identify the officials who will receive immediate notification.
• Procedures to ensure that appropriate staff and contractor personnel are aware of and follow the Emergency Response Plan and are appropriately trained. • Procedures to address emergency operations, such as traffic and crowd control and other necessary response activities; and
A program to ensure that all reasonable steps are taken to contain and prevent the discharge of untreated and partially treated wastewater to waters of the United States and to minimize or correct any adverse impact on the environment resulting from the SSOs, including such accelerated or additional monitoring as may be necessary to determine the nature and impact of the discharge.

Amend
Report
CIWQS
Repor�ng
Surface Source Volume No�fica�on Monitoring
Water
Contact
Category
Within 90
days
Dra� in 3 Days
Cer�fy in 15 days
Technical Report
in 45 Days
Site Monitoring
and Sampling
within 18 hours
if > 50,000
gallons
Call OES
within 2
hours if >
1000 gallons
City Owned Any volume
lateral or
sewer
1 Yes
Within 90
days
Dra� in 3 Days
Cer�fy in 15 days
Technical Report
N/A
Call OES Site Monitoring
(not required)
Greater
than 1000
Gallons
City Owned
lateral or
sewer
2 None
Within 90
days
Cer�fied Spill
Report in 30 Days
N Site Monitoring 50 – 1000 /A
Gallons
City Owned
lateral or
sewer
3 None
Annually By
February 1
CERTIFY total
volume of all
Category 4 spills
Monthly Report
total volume of all
Category 4 spills
within last 30 days
N Site Monitoring Less than 50 /A
Gallons
City Owned
lateral or
sewer
4 None
The City has developed a Sewer Spill Emergency Response Plan (SSERP) and Workbook.

This plan and workbook contained the necessary procedures, flowcharts, contact information, training requirements, equipment, notification, reporting, and other information need to effectively respond to a spill of sewage from the City’s sewer system. The SSERP and the associated workbook are included in the appendix to this SSMP.

Section VII. Fats, Oils, and Grease (FOG) Control Program SWRCB Waste Discharge Requirement:

Each Enrollee shall evaluate its service area to determine whether a FOG control program is needed. If an Enrollee determines that a FOG program is not needed, the Enrollee must provide justification for why it is not needed. If FOG is found to be a problem, the Enrollee must prepare and implement a FOG source control program to reduce the amount of these substances discharged to the sanitary sewer system. This plan shall include the following as appropriate:
• An implementation plan and schedule for a public education outreach program that promotes proper disposal of FOG.
• A plan and schedule for the disposal of FOG 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 FOG generated within a sanitary sewer system service area.
• The legal authority to prohibit discharges to the system and identify measures to prevent SSOs and blockages caused by FOG.
• Requirements to install grease removal devices (such as traps or interceptors), design standards for the removal devices, maintenance requirements, BMP requirements, record keeping and reporting requirements. • Authority to inspect grease producing facilities, enforcement authorities, and whether the Enrollee has sufficient staff to inspect and enforce the FOG ordinance. • An identification of sanitary sewer system sections subject to FOG blockages and establishment of a cleaning maintenance schedule for each section; and • Development and implementation of source control measures for all sources of FOG discharged to the sanitary sewer system for each section identified in (f) above.

INTRODUCTION
What is FOG?
Fats, oils, and grease (FOG) are produced from residential and commercial food preparation activities and are by products from food preparation activities. FOG captured on site is classified into two broad categories: yellow grease and grease trap waste. Yellow Grease is derived from used cooking oil and waste greases that are separated and collected at the point of use by food service establishments. They are pollutants of concern due to their potential clogging impact on the sanitary sewer collection system. Some examples of food products that produce FOG are fried foods, Meat fats, dairy products, (butter, margarine, cheese, and milk) salad dressing and cooking oils, fatty and greasy food scraps, and baked goods.

The goal of the City’ of Gonzales FOG Control Program is to reduce the number of SSOs caused by FOG in the collection system by minimizing FOG discharged in the sanitary sewer system. The City’s Public Works Department has implemented a FOG program to address FOG and meet these goals. The City’s FOG Control Program includes the following elements as appropriate:
a) An implementation plan and schedule for a public education outreach program that promotes proper disposal of FOG.
b) A plan and schedule for the disposal of FOG generated within the sanitary sewer system service area. This may include a list of acceptable disposal facilities. c) The legal authority to prohibit discharges to the system and identify measures to prevent SSOs and blockages caused by FOG.
d) Requirements to install grease removal devices (such as traps or interceptors) design standards for the grease removal devices, maintenance requirements, BMP requirements, record keeping and reporting requirements. e) Authority to inspect grease producing facilities, enforcement authorities, and whether the City has sufficient staff to inspect and enforce the FOG ordinance. f) An identification of sewer system sections subject to FOG blockages and establish a cleaning maintenance schedule for each section.
g) Development and implementation of source control measures, for all sources of FOG discharged to the sewer system section identified in (f) above.

FOG Public Education and Outreach
The goal of FOG public education outreach is to educate the residents about preventing grease blockages through proper handling and disposal of FOG. When a grease related Sanitary Sewer Overflow (SSO) occurs in a residential area, Public Works Staff to distribute educational material to nearby residents. This material provides the resident information on proper disposal of FOG.

In addition, the City participates in developing and delivering grease-related messages in both English and Spanish through our website and in our utility bills.

The City also educates food service owners of the need to keep grease fats and oils out of the collection system and Best Management Practices.

FOG Disposal
The City of Gonzales promotes and ensures that FOG is collected from grease traps and interceptors and disposed of properly. Food service establishments can adopt a variety of Best Management Practices to control and capture the FOG material before discharge into the collection system. The City will regularly inspect food service facilities and their records of proper disposal of Fats, Oils, and Grease. The following are a list of acceptable disposal sites for grease. FOG generators hire service providers to haul off FOG wastes for proper disposal.

Service Provider Phone number

BEST MANAGEMENT PRACTICES (BMP) REQUIREMENTS
City of Gonzales Municipal code 10.16.030 “All dischargers shall implement best management practices in their operations to minimize the discharge of grease to the sanitary sewer system.” Environmental Inspectors educate staff on Best Management Practices (BMPs) that protect the collection system and minimize removal efficiency of grease collection devices and strongly encourage their use. BMPs are detailed in outreach materials, available in English and Spanish, are given out during inspections and available for download from our city’s website. These BMP’s include:
• Employee training and awareness: This BMP is intended to recommend that all employees and FOG producing establishments be adequately trained on activities to reduce FOG disposal into the sanitary sewer system.
• Garbage Grinder elimination: This BMP recommends that FOG generators minimize or eliminate garbage grinders or limit their use. • Spill Clean up: This BMP emphasizes the use of dry-cleaning methods for cleaning up spills. If dry methods are insufficient, water use and discharge to the sanitary sewer should be limited to the greatest extent possible.

Best Management Practices (BMPs) will be reviewed and distributed to restaurant representatives during the plan check, including kitchen practices to minimize the discharge of grease into the sewer system, maintenance tips for grease traps and interceptors, and record keeping requirements. Plumbing inspectors verify the installation and connections of the pretreatment device.

FOG Legal Authority
The Publics Work Director/City Engineer is authorized to execute Legal Authority over the use, construction, services, permits, and procedures related to City’s wastewater collection system.

The City’s existing sewer ordinance 2021-130 contains the following provision.

Grease Pretreatment Device Plan Checks
The Public Works Director will determine the sizing requirements for all grease removal/pretreatment devices (GRD). Building plans with food service equipment for new construction or remodeling will be reviewed and stamped off with any requirements. The plans are reviewed along with a questionnaire filled out by the restaurant representative, and the requirement for a GRD is determined. The City will not approve any tenant improvement plans without the review comments and requirements.

The plan review process also involves a GRD certification. This certification involves the restaurant representative signing an acknowledgement of GRD requirements. The minimum acceptable cleaning frequency for the type of GRD being required, the on-site maintenance of a schedule and instructions for cleaning, and cleaning records and receipts, are some of the requirements acknowledged in the certification.

The size and type of pretreatment device required is determined based upon the facility’s potential for discharging grease in the wastewater. The sizing is based on the size of the restaurant, the cooking, and cleaning equipment installed, and the number of meals served.

Requirements range from a small grease trap beneath the pot sink to a large in-ground grease interceptor.

GCD INSTALLATION REQUIREMENTS
All food service establishment, or other type of business or establishment where grease or other viscous, obstructing, or objectionable materials may be discharged into a public or private sewage disposal system, shall have a grease control device (GCD) and related plumbing of a size and design approved by the City.
• GCD DESIGN STANDARDS
The potential for discharging grease into the sanitary sewer determines the size and type of GCD required to treat their waste stream. Some of the factors considered in order to determine the required GCD size include the size of the restaurant, the type and amount of cooking and cleaning equipment installed, and the number of meals served. • GCD MAINTENANCE REQUIREMENTS
A. Grease control devices shall be maintained in efficient operating condition by periodic removal of accumulated grease. The use of chemicals, bacteria enzymes, or other additives that have the effect of emulsifying or dissolving grease is prohibited unless specifically authorized by the director in writing. NO accumulated grease shall be introduced into nay drainage piping or public or private sewer.

B. Grease control devices shall be cleaned on a sufficient frequency to prevent objectionable odors, surcharge of the grease control device, or interference with the operation of the sanitary sewer system.

1. Grease traps shall be cleaned at least once every 30 days.

2. Mechanical grease removal devices must be maintained in a matter and frequency consistent with the manufacturer specifications and guidance.

3. Grease control devices shall be cleaned when their last chamber is filled to twenty-five percent or more of capacity with grease or settled solids.

4. Grease control devices shall be cleaned by removal of all accumulated sludge on all surfaces including sides, baffles, and tees. No water removed from the device during cleaning shall be returned to the grease control device.

Environmental Inspectors review records during FOG inspections to verify compliance with these requirements.
• GCD MAINTENANCE RECORDS
Dischargers shall maintain records on site for a period of at least three years as follows:

1. Dischargers with an installed grease control device shall maintain records showing that the grease control device has been properly cleaned and maintained as required by Subsections a and B; and

2. Food service establishments shall maintain records showing the following related to all grease hauled off site: date and time, material removed from site; volume removed; hauler name; truck silence number; type of grease removed, and destination of material collected.

Environmental inspectors review records during FOG inspections to verify compliance with these requirements.

Standard Restaurant Inspections
The Public Works Director and assigned staff will inspect all restaurants and other food facilities.

Their initial inspection will include determining if the restaurant generates grease, if there is a GRD in place, and reviewing the cleaning records for the GRD, as well as practices used to clean floor mats, vent hoods, and outside areas. Enforcement actions are taken against any restaurant that does not clean their GRD at the minimum set frequency (monthly for grease traps and quarterly for grease interceptors). Restaurants are required to keep cleaning records for 3 years.

The City shall conduct GCD inspections at all facilities with GCDs. The shall city inspect all GCDs at a minimum of once per year. GCD inspection frequencies may increase based on sitespecific findings or staff resources. Basic steps of a GCD inspection include the following:
• GCD pre-inspection

1. Inspector plans inspections geographically to maximize efficiency and minimize drive time between facilities.

2. Although GCD inspections are unannounced, plan GCD inspections to accommodate facility-specific scheduling issues, such as avoiding opening traps during the busy lunch hours.

3. Gather and prepare any needed tools, supplies, educational materials, documentation, etc.
• GCD INSPECTIONS

1. Introduce and identify yourself to the facility operator, typically the owner or manager on duty. Use the outreach material as needed.

2. Explain the purpose of the inspection, what areas need inspecting, and request permission to inspect the GCD.

3. Inspect and document the condition of all pertinent components.

4. Take core sample to determine the depth of grease and solids in the device.

5. Measure length, width, and depth of device.

6. Determine and document if FOG is present in the effluent.

7. Determine and document if any major faults in the device need attention, such as unsecured lid, evidence of incorrectly plumbed device (grinder, dishwasher, sanitizer, etc.), evidence of domestic sewage, device is installed backwards, power unplugged, etc.

8. Complete GCD inspection report
GCDs found to have components broken or missing, incorrectly plumbed or over 25% full of grease and solids are referred for another inspection after time is allowed for maintenance and cleaning.

Investigation of FOG in Sewer Mains
The Public Works Director and assigned staff will respond to reports from staff or other sources when a grease blockage or unusual build-up of grease has taken place in the sanitary sewer.

Referrals for investigations are commonly based on the following reasons:

1. Excessive grease build up

2. Odor complaints

3. Request for service

4. Blockages due to grease

5. Excessive grease evident during preventive maintenance

6. Reduced flow

7. Video inspection identifies excessive grease

8. Litigation
The area upstream of the grease build-up is evaluated for potential sources, and inspections of those sources are performed. The presence and size of GRD are looked at, and GRD cleaning and maintenance records are reviewed. Enforcement action is taken against establishments determined to be causing grease blockages in the sanitary sewer, and additional requirements for cleaning or installation of GRD can be imposed.

Participation in Regional FOG and/or SSO Management Efforts The Public Works Director/City Engineer and the Public Works Supervisor participate in South Salinas Valley Public Works Managers(SSVPWM) group. The SSVPWM meets every other month to discuss mutual challenges Cities and agencies experience while managing and operating wastewater collection systems. The SSVPWM meetings also facilitate collaboration for mutual aid opportunities when one or more members are dealing with system emergencies.

Section VIII. Capacity Management
SWRCB Waste Discharge Requirement:

The Enrollee shall prepare and implement a CIP that will provide hydraulic capacity of key sanitary sewer system elements for dry weather peak flow conditions, as well as the appropriate design storm or wet weather event. At a minimum, the CIP must include:
• Evaluation: Actions needed to evaluate those portions of the sanitary sewer system that are experiencing or contributing to an SSO discharge caused by hydraulic deficiency.

The evaluation must provide estimates of peak flows (including flows from SSOs that escape from the system) associated with conditions similar to those causing overflow events, estimates of the capacity of key system components, hydraulic deficiencies (including components of the system with limiting capacity) and the major sources that contribute to the peak flows associated with overflow events. • Design Criteria: Where design criteria do not exist or are deficient, undertake the evaluation to establish appropriate design criteria; and • Capacity Enhancement Measures: The steps needed to establish a short‐ and long‐ term CIP to address identified hydraulic deficiencies, including prioritization, alternatives analysis, and schedules. The CIP may include increases in pipe size, I/I reduction programs, increases and redundancy in pumping capacity, and storage facilities. The CIP shall include an implementation schedule and shall identify sources of funding.

Schedule: The City shall develop a schedule of completion dates for all portions of the capital improvement program
Evaluation
Wastewater in the City of Gonzales is collected by the City’s sanitary sewer system and conveyed to the Gonzales Wastewater Treatment Plant (GWWTP), located approximately two miles west of the City at 400 Short Road, Gonzales, CA. The GWWTP is a grade II lagoon ponding treatment plant, which treats wastewater to secondary standards and disposes of effluent through three 7-acre infiltration basins, with some evaporation also occurring during the treatment process. The GWWTP has a permitted discharge capacity of 1.3 MGD, but the full build out of the existing city is expected to generate 3.60 MGD of wastewater.

In January of 2022 Engineering consultant Psomas completed a technical memorandum entitled the Wastewater Conveyance System Evaluation and CIP Program Development. This technical memorandum reported findings from the following tasks:

A. Data from the latest master plan model was imported into InfoSewer modeling software for analysis. Model pipeline data was then updated and adjusted using available as-built information.

B. Whitson Engineers surveyed key manholes for rim and invert elevations throughout the City to confirm as-built information, adjust for datum inconsistencies, and fill in missing data along pipelines tributary to two areas within the City where new development is being proposed.

C. There were multiple sewer segments (manhole to manhole) surveyed that did not match the data provided in an original sewer model and the City GIS shapefile, including differing pipe diameters. Field measurements were used whenever a discrepancy was present. For manholes that were not surveyed, interpolated inverts and rim elevations were generated and input into the model.

D. Collection system lift station pumps in the model were calibrated to field observations at Canyon Creek, Sunrise, Arroyo, and Cal Breeze Sewer Lift Stations.

The average flow rate at each pump was calculated by timing the pump cycles and measuring the change in levels in the wet wells. Measurements were taken for about an hour at each lift station during both a morning and afternoon peak period. The pump data collected also included the level switches in the wet wells (floats) that start and stop the pump cycles. Each pump station has two pumps with one in standby. The average flow rates and switch data for the lift stations were entered into the model for existing conditions.

E. Assessment of the capacity of the existing sewer system was made with the assumption that industrial flows will be removed from the existing system as currently planned as the City intends to construct a separate pipeline for industrial flows that will convey those industrial flows to an industrial wastewater plant which the City also intends to construct.

Design Criteria
To accommodate the expected increase in wastewater flows, the City of Gonzales plans to construct a new 1 million gallon per day Industrial Wastewater Treatment Facility adjacent to the current wastewater treatment plant. The City plans to construct a separate wastewater collection system from the Gonzales Agricultural Industrial Park to the new Industrial Wastewater Treatment Facility, thereby separating industrial wastewater from the City’s domestic wastewater and freeing up capacity at the existing GWWTP. This approach is anticipated to achieve more efficient operations at both treatment plants, because domestic and industrial wastewater contain different contaminants and therefore can be more efficiently treated separately. When needed, the City will also complete a phased expansion of its existing wastewater treatment plant to increase the plant’s capacity as development proceeds and new connections are added.
• The City contracted with professional engineering consultant Harris and Associates and completed a wastewater master plan in 2018. • A Wastewater Master Plan was completed by Kimley Horn (December 2019) evaluating the sewer collection system for the existing City plus the City’s sphere of influence. The City’s CIP currently calls for the next wastewater master plan to be completed in the 2024-2025 fiscal year.

Capacity Enhancement Measures
After each sanitary sewer overflow the City will conduct a failure analysis investigation.

City staff also conducts periodic inspections of the sewer system. When failure analysis investigations or periodic inspections identify deficiencies in the sewer system repairs and refurbishment of sewer infrastructure will be planned for as a part of the ongoing maintenance program and/or included in the next Capital Improvement Plan.

The City of Gonzales has developed a 5-year capital improvement program(CIP). The 5-year CIP lists all the major projects the City plans to complete to develop and maintain adequate capacity in the wastewater collection and the wastewater treatment systems.

Each year the City reviews the 5-year CIP and prioritizes projects to target for completion based on infrastructure needs and funding. The CIP also guides the City’s funding rate study efforts with the goal to acquire adequate funding to move forward with needed infrastructure projects. The 5-year CIP has the following projects among those identified for future development:

A. Update the Wastewater Master Plan
B. A wastewater rate study
C. Renewal of Waste Discharge Requirements for Wastewater collection and treatment
D. Acquiring Waste Discharge Requirements for Industrial Wastewater collection and treatment facilities.

E. Development of a wastewater pretreatment program
F. Expansion and upgrade of the domestic wastewater treatment plant G. Construction of a separate conveyance system for industrial wastewater H. Construction of a separate industrial wastewater treatment plant I. Upgrades to the system control and data acquisition system (Scada) Section IX. Monitoring, Measurement, and Program Modifications SWRCB Waste Discharge Requirement:

The Enrollee shall:
• Maintain relevant information that can be used to establish and prioritize appropriate SSMP activities.
• Monitor the implementation and, where appropriate, measure the effectiveness of each element of the SSMP.
• Assess the success of the preventative maintenance program. • Update program elements, as appropriate, based on monitoring or performance evaluation and
• Identify and illustrate SSO trends, including frequency, location, and volume

SSO RECORDS
The City maintains SSO, spill, and records of SSO events in the form of spill report forms.

Hardcopies are filed in the City’s corporation yard office. The City uses the State’s CIWQS electronic SSO reporting system, which records the number, volume, locations, and causes of SSOs. Citizen complaints related to sewer odors or SSOs are convert to work orders and sent to the Public Works Department. Those works orders also keep on file at the corporation yard office.

Section X. SSMP Program Audits
SWRCB Waste Discharge Requirement:

As part of the SSMP, the City shall conduct periodic internal audits, appropriate to the size of the system and the number of SSOs. At a minimum, these audits must occur every two years and a report must be prepared and kept on file. This audit shall focus on evaluating the effectiveness of the SSMP and the Enrollee’s compliance with the SSMP requirements identified in the WDR, including identification of any deficiencies in the SSMP and steps to correct them.

Measuring Effectiveness of SSMP Elements
The City will update elements of this plan and its monitoring program as necessary, if significant changes occur to the City’s infrastructure, service area demands, or organizational structure. With the information available in the SSO reporting files and a future computerized maintenance management system (CMMS) the City will measure the effectiveness of the SSMP by tracking various parameters related to customer calls, maintenance, and inspections, and by comparing SSO trends from previous years to identify and target repairs to sewer system appurtenances that have or may contribute to system failures. The City will begin tracking the following list of metrics by February 28, 2024:

1. Number of SSOs per year

2. Total Volume of SSOs per year

3. Number of SSOs caused by roots

4. Number of SSOs caused by Fats, Oil and Grease (FOG)

5. Amount Sewer Cleaned feet per year

6. Amount Sewer Inspected by Close Circuit Television(CCTV) per year The City typically has 1 or 2 SSOs per year. Therefore, with so few SSO occurrences there is no need for arduous management practices and procedures to track metrics.

The city will continually monitor SSO occurrences with the goal to conduct operational and maintenance activities such that there is no significant increase in the frequency or volume of SSOs.

Annually the City will record the following information related to the wastewater collection system and upload this information into the States’ California Integrated Water Quality System (CIWQS). Capturing this data in CIWQS should provide the City with adequate metric tracking information.

SSMP Audits
At a minimum once every three years the City will conduct an internal audit of the SSMP to assess its effectiveness. Metrics and goals will be evaluated, and adjustments made to achieve targets. The Legally Responsible Official shall submit an audit report into the online CIWQS Sanitary Sewer System Database (such audits will only be viewable to Water Boards Staff).
• The level of detail of the audit will be based on the size of the system and the frequency of spills and overflows.
• City staff responsible for operating the collection system will be involved in the audit.
• The audit will evaluate the City’s compliance with the General Order • Identify deficiencies that lead to spills and discharges to Waters of the State • Identify modifications to the SSMP to correct deficiencies.

THE AUDIT REPORT
The audit report must include:
• Audit findings and recommendations for corrective actions • A statement that sewer system operators’ input on audit findings has been considered.
• A proposed schedule for the City to address the identified deficiencies.

SSMP AUDIT FORM
Section I. Mission, Goals and Objectives YES NO
Are the goals in the SSMP appropriate for existing conditions? Section II. Organization
Is the City sewer service contact list up to date?
Is the Sanitary Sewer Spill and overflow response contact info up to date? Is the City Sewer Service Organization Chart up to date? Do the position descriptions accurately reflect current responsibilities? Is the chain of communication reporting up to date?
Section III. Legal Authority
The City have legal authority to prevent illegal discharges to sewer? Code requires proper design and construction of sewers and connections?
Code ensures access to sewers (repairs, inspection, and maintenance)? Code requires limitations on the discharge of fats, oils, and grease (FOG)?
Code gives authority to enforce violations of sewer ordinance? Section IV. Operation and Maintenance Program
SSMP details the process to keep collection system maps updated? Collection system maps are current and contain sufficient detail? Collection system has adequate funding for O&M activities? SSMP describes budgeting process for collection system funding? SSMP describes PM activities and activities for prioritization? Based on SSO trends are PM activities sufficient and effective? Condition assessment program sufficient for proper planning and budget? Condition assessment program detailed in SSMP?
Are major components of the collection system listed in the SSMP? Are procedures for inventory management noted in SSMP?
Inventory has sufficient emergency equipment and replacement parts? Staff trained on SSO response and collection system maintenance? SSMP lists minimum training for collection system workers? SSMP documents outreach activities to plumbers and contractors? Section V. Design and Construction Standards YES NO
SSMP contains design, repair, and construction standards? SSMP contains SOPs for testing new and refurbished infrastructure? Section VI. Overflow Emergency Response Plan
SSMP contains procedures for SSO response, notifications, and reporting?
City Staff is trained on the Overflow Emergency Response Plans? Based on SSO metrics is Overflow Emergency Response Plan effective? Section VII. Fats, Oils, and Grease (FOG) Control Program Public education is a part of the City’s FOG management program? FOG program has problem area and overall preventative maintenance? FOG Program has requirements for grease removal devices? FOG Program has proper record keeping and best mgmt. practices? City has legal authority to enforce requirements of the FOG program? Based on SSO and sewer blockage metrics is FOG Program effective? Section VIII. Capacity Management
City’s Master Plan evaluates hydraulic deficiencies and IDs improvements?
City’s Master Plan establishes sufficient design criteria? City’s CIP establishes a schedule for short- and long-term improvements? City’s CIP continually reviewed for adequate budget and CIP completion? Section IX. Monitoring, Measurement, and Program Modifications YES NO SSMP accurately tracks and reports on performance metrics? City can evaluate the effectiveness of the SSMP?
Section X. SSMP Program Audits
SSMP will be audited and submitted by March 15th with Annual Report? Section XI. Communication Program YES NO
SSMP communicated to public and other agencies, feedback is addressed?
Section XI. Communication Program
SWRCB Waste Discharge Requirement:

The Enrollee shall communicate on a regular basis with the public on the development, implementation, and performance of its SSMP. The communication system shall provide the public the opportunity to provide input to the Enrollee as the program is developed and implemented. The Enrollee shall also create a plan of communication with systems that are tributary and/or satellite to the Enrollee’s sanitary sewer system.

Communications with and outreach to residential, commercial, and industrial customers and the general public.

The City’s communications program involves mailing, emailing, and posting on the City’s website (https://gonzalesca.gov) SSMP components and other related information for input by the public as well as dissemination of important SSMP requirements. The City also conducts extensive public outreach and education to residents and businesses related to sanitary sewer overflows, preventing grease blockages and Best Management Practices for the handling of grease waste.

Links to such information are located on the City’s website where the public and City customers are encouraged to view. Additional links such as the Association of Bay Area Governments’ (ABAG) “Sewer Smart” and the District’s Standard Design Details are available for residential and commercial customers.

The City is planning to send informational flyers to all residential and business property owners and tenants describing the negative impacts of discharging fats, oil, and grease (FOG) into the sanitary sewer system. In areas where sewer overflows are attributed to FOG, the City sewer inspectors canvass the vicinity with notifications to residents and businesses to reinforce the message to avoid pouring these items down sewer drains.

The City will make every effort to disseminates information, in meetings and/or by mailings to land developers, consultant engineers, and plumbing contractors regarding the need and methods to reduce SSOs.

Communication with other local Watershed Stakeholders
California Water/Wastewater Agency Response Network (CalWARN) was established with a mission to support and promote statewide emergency preparedness and mutual assistance for member public and private water and wastewater utilities, has been active for approximately 23 years. The organization is divided into six regions within the state. Membership in this organization of all the neighboring agencies and others having common watershed interests, would be a first step toward accomplishing the stated objectives above described and is encouraged. Additional information for CalWARN can be found at its website www.calwarn.org The Public Works Director/City Engineer and the Public Works Supervisor participate in South Salinas Valley Public Works Managers(SSVPWM) group. The SSVPWM meets every other month to discuss mutual challenges to managing and operating wastewater collection systems.

The SSVPWM meetings also facilitate collaboration for mutual aid opportunities when one or more members are dealing with system emergencies.
* PWD directs caller to contact non-emergency dispatch who notifies an on-call employee Person Phone and email
Public Works Director/
City Engineer
Patrick Dobbins 831-675-5000
[email protected]
Public Works Supervisor Tiffany Twisselmann 831-776-2095 [email protected]
Lead Worker Frank Valladarez 831-737-5038
[email protected]
City Website https://gonzalesca.gov
Daytime Phone 831-675-5000
After-hours Phone 831-675-5000*
Appendices
Annual Report Information Required
The City must update their previous year’s Annual Report, by April 1 of each year.

The Annual Report must be entered directly into the online CIWQS Sanitary Sewer System Database. The City’s Legally Responsible Official shall certify the Annual Report as instructed in CIWQS.

The Annual Report must address, and update as applicable, the following items:
• Population served.
• Updated sewer system service area boundary map if service area boundary has changed from original map
• Number of system operation and maintenance staff:
o Entry level (less than two years of experience),
o Journey level (greater than two years of experience), o Supervisory level, and
o Managerial level.
• Number of operation and maintenance staff certified as a certified collection system operator by the California Water Environmental Association (CWEA), with:
o Corresponding number of certified collection system operator grade levels (Grade I, II, III, IV, and V).
• System information:
o Miles of system gravity and force mains,
o Number of upper and lower service laterals connected to system, o Estimated number of upper and lower laterals owned and/or operated by the City,
o Portion of laterals that is City’s responsibility,
o Average age of the major components of system infrastructure, o Number and age of pump stations, and
o Estimated total miles of the system pipeline not accessible for maintenance. • Name and location of the treatment plant(s) receiving sanitary sewer system waste.
• Name of satellite sewer system tributaries.
• Number of system’s gravity sewer above or underground crossings of water bodies throughout system.
• Number of force main (pressurized pipe) above or underground crossings of water bodies throughout system.
• Number of siphons used to convey waste throughout the sewer system. • Miles of sewer system cleaned.
• Miles of sewer system video inspected, or comparable (i.e., video closed-circuit television or alternative inspection methods).
• System Performance Evaluation as specified in section 5.11 (System Performance Analysis) of the State’s General Order(See Below).
• Major spill causes (for example, root intrusion, grease deposition) System infrastructure failure points (for example, main, pump station, lateral, etc.). • Ongoing spill investigations; and
• Actions taken to address system deficiencies.

System Performance Analysis
The City shall include a running 10-year system performance analysis in its Annual Report. The analysis must include two CIWQS-generated graphs presenting the following information:

Graph 1 – Total Spill Volume per Year:

X axis: A 10-year period which includes the current calendar year and the nine previous calendar years.

Y axis: The total spill volume, per Spill Category, for each calendar year.

Graph 2 – Total Number of Spills per Year:

X axis: A 10-year period which includes the current calendar year and the nine previous calendar years.

Y axis: The total number of spills, per Spill Category, for each calendar year.

The current calendar year is the calendar year covered in the Annual Report.

The City shall generate the graphs in CIWQS, using the existing data in the online CIWQS Sanitary Sewer System Database at the following graph generation link:
(https://ciwqs.waterboards.ca.gov/ciwqs/readOnly/PublicReportSSOServlet?reportActio n=criteria&reportId=sso_operation_report).

Sewer Spill Emergency Response Plan and Workbook

Gonzales City CouncilNovember 6, 2023

Gonzales City Council
November 6, 2023