Ripon City Council
March 14, 2023

Sewer System Management Plan City of Ripon
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G:\City Engineer\ENG1\SEWER\Sewer System Management Plan (SSMP)\2023 Update\Documents\SSMP March 2023.docx Sewer System Management Plan
City of Ripon
March 14, 2023
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G:\City Engineer\ENG1\SEWER\Sewer System Management Plan (SSMP)\2023 Update\Documents\SSMP March 2023.docx 1 Introduction
A Sewer System Management Plan, also called an SSMP, describes the activities that a public wastewater agency uses to manage its wastewater collection system effectively. The development of the City’s SSMP was required when the State Water Resources Control Board (SWRCB) adopted the Statewide General Waste Discharge Requirement (GWDR) on May 2, 2006. The GWDR established requirements for operating, maintaining and managing wastewater collection systems. The GWDR applies to all public collection system agencies in California that own and operate collection systems comprised of more than one (1) mile of pipe or sewer lines, which convey untreated wastewater to a publicly owned treatment facility and requires each agency to prepare an SSMP. 2 Goals
GWDR Requirement:

The collection system agency must develop goals to properly manage, operate, and maintain all parts of its wastewater collection system in order to reduce and prevent SSOs, as well as to mitigate any SSOs that occur.

The goal of the SSMP is to provide a plan and schedule to properly manage, operate, and maintain all parts of the sanitary sewer system. This will help to reduce and prevent SSOs, as well as mitigate any SSOs that do occur.
a. Properly manage, operate and maintain all parts of the wastewater collection system.
b. Provide adequate capacity to convey peak flows and reduce annual inflow and infiltration in the collection system.
c. Minimize the frequency of SSOs
d. Mitigate the impacts of SSOs utilizing safe, practical, proven and effective methods.
e. Meet all applicable regulatory notification and reporting requirements.

A change log is included in Appendix A to document all changes to the SSMP starting with the January 2023 publication.

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GWDR Requirement:

The collection system agency’s SSMP must identify:
a. The name of the agency’s responsible or authorized representative. b. The names and telephone numbers for management, administrative, and maintenance positions 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
c. 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).

The intent of this section of the SSMP is to identify City staff who are responsible for implementing this SSMP, responding to SSO events, and meeting the SSO reporting requirements. This section also includes the designation of the Authorized Representative to meet SWRCB requirements for completing and certifying spill reports.

3.1 Authorized Representative
The City’s Authorized Representative in all wastewater collection system matters is:

Mr. James Pease
Public Works Director
City of Ripon
259 N. Wilma Ave
Ripon, CA 95366
Mr. Pease is authorized to submit verbal, electronic, and written spill reports to the RWQCB, SWRCB, County Health Agency, and OES. Mr. Pease is also authorized to certify electronic spill reports submitted to the SWRCB.

3.2 Organization Chart
Figure 1 is the City of Ripon organization chart that shows the management, administrative, and maintenance positions for implementing specific measures in the SSMP program and lines of authority.

Associate Civil
Engineer
City Engineer
Civil Eng
Tech II
Figure 1
City of Ripon Organizational Chart

CITY COUNCIL
City Administrator
Sec
Sec
Foreman
(4total)
Public Works
Director
Regulatory
Compliance
Lead
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3.3 Names, Phone Numbers and Lines of Authority
Table 1 shows the names and telephone numbers for key management, administrative, and maintenance positions for implementing specific measures in the SSMP program. Each of the individuals listed is a registered Legally Responsible Official (LRO).

Table 1 – Legally Responsible Official Contact List
Position Name Phone Email
City Administrator/
City Engineer
Kevin Werner 209-599-0235 [email protected]
Public Works
Director
James Pease 209-599-0225 [email protected]
Below is a summary of the key management, administrative, and maintenance positions.

City Administrator – Administrative officer is responsible for the efficient administration of all the affairs of the City, including overseeing laws and ordinances of the City are duly enforced, analyze the functions, duties and activities of the various departments.

City Engineer – will prepare collection system planning documents, manage the capital improvement program, coordinate development and implementation (specifically Sections 7-8) of the City’s SSMP, and provides support to all parts of operations and maintenance.

Public Works Director – manages field operations and maintenance activities, leads emergency response, investigates and reports SSOs, and trains field crews. Also, participates in the development and coordinates the implementation (specifically Sections 4-6) of the City’s SSMP.

Foreman – assists in the training and supervision of the field crew, issues work orders, and performs skilled work in maintenance and operations of the sewer and stormwater systems.

Regulatory Compliance Lead – implements the regulatory action and safety programs of the City, including updates to the SSMP.

Field Crew –will complete preventative maintenance activities, mobilize and respond to notification of stoppages and SSOs (mobilize sewer cleaning equipment, by-pass pumping equipment, and portable generators).

3.4 Chain of Communication for Reporting SSOs
Figure 2 shows the chain of communication for reporting SSOs.

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G:\City Engineer\ENG1\SEWER\Sewer System Management Plan (SSMP)\2023 Update\Documents\SSMP March 2023.docx Figure 2
Chain of Communication
SSO Alert:

Public
City Staff
Public Works
Dept
City Hall Police
Dispatch
Public
Works
Director
SCADA
Wet Well
Alarm
After Hours Public
Works On-call Staff
Utility
Foreman
Investigate,
Contain, Fix,
Cleanup
RWQCB
Region 5S
San Joaquin
County OES
San Joaquin
County
Health Dept
CIWQB Internet
Reporting
System
If Public Works
Director cannot
be reached
CIWQB
Internet
Reporting
System
Category 2 SSO
Category 1 SSO
Field Crew
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GWDR Requirement:

The collection system agency must demonstrate, through collection system use ordinances, service agreements, or other legally binding procedures, that it possesses the necessary legal authority to:
a. Prevent illicit discharges into its sanitary sewer system; b. Require that sewers and connections be properly designed and constructed; c. Ensure access for maintenance, inspection, or repairs for portions of the lateral owned or maintained by the Public Agency;
d. Limit the discharge of fats, oils, and grease and other debris that may cause blockages, and
e. Enforce any violation of its sewer ordinance.

The City of Ripon possesses the necessary legal authority to prevent, require, ensure, limit and enforce specific features and operations required by the Order. A summary of the relevant sections of the Ripon Municipal Code (RMC) are shown in Table 2. A copy of each section of the code is included in Appendix B.

Table 2 – Summary of Legal Authority
Legal Authority To: Existing Authority

1. Prevent illicit discharges into the wastewater collection system

13.08.040

13.08.050

13.08.090

13.08.100

13.08.130

13.13.020

13.13.030

2. Require that sewers and connections be properly designed and constructed

13.08.020

13.08.120

13.08.130

3. Ensure access for maintenance, inspection, or repairs for portions of the lateral owned or maintained by the Public Agency 13.08.040

4. Limit the discharge of fats, oils, and grease and other debris that may cause blockages

13.13.040

13.13.050

13.13.090

5. Enforce any violation of its sewer ordinance 13.13.190 (O) Sewer System Management Plan City of Ripon
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GWDR Requirement:

The SSMP must include those elements listed below that are appropriate and applicable to the collection system agency’s system:
a. 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 storm water conveyance facilities;
b. Describe routine preventative 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 Preventative Maintenance (PM) program should have a system to document scheduled and conducted activities, such as work orders;
c. 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 system ranking the conditions 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 to implement the short- and long- term plans plus a schedule for developing the funds needed for the capital improvement plan.
d. Provide training on a regular basis for staff in sanitary sewer system operations and maintenance, and require contractors to be appropriately trained; and e. Provide equipment and replacement part inventories, including identification of critical replacement parts.

The intent of this section of the SSMP is to describe the current operation of the City’s wastewater collection system. There are five areas of the City’s Operations and Maintenance (O&M) program that are required to be described, including:
 Collection System Maps
 Preventative Operation and Maintenance Program
 Rehabilitation and Replacement Plan
 Training
 Contingency Equipment and Replacement Inventories

5.1 Collection System Map
Included in Appendix C is the City of Ripon sanitary sewer system map and storm drain map. The maps are updated electronically whenever a new subdivision is added or changes Sewer System Management Plan City of Ripon
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G:\City Engineer\ENG1\SEWER\Sewer System Management Plan (SSMP)\2023 Update\Documents\SSMP March 2023.docx are made to the collection system. These updates occur in less than a month from the time that the subdivision utilities have been completed and accepted by the City.

The Engineering Department is contacted by public works personnel and told of any discrepancies found in the field for map corrections. The discrepancies are investigated and the collection system map updated, as needed.

5.2 Preventive Operation and Maintenance Program
The City of Ripon owns, operates and maintains a sanitary sewer collection system that conveys wastewater to the City of Ripon Wastewater Treatment Plant (WWTP). The system has 60 miles of sanitary sewer and 50 miles of storm drain pipelines. The City does not own or maintain the service lateral piping which conveys the wastewater from the house or structure to the connection to the sewer main. The property owner is responsible for any problems in the service lateral.

The City of Ripon has a preventative maintenance program to minimize sewer overflows and to keep the wastewater flowing to the treatment plant, by employing a collection system crew made up of the following staff:
 Foreman (4)
 Field Crew (30)
The City crews’ preventative maintenance approach to operating and maintaining the wastewater collection system consists of the following:
 Routine Sewer Cleaning:
 Clean and flush sewer mains to maintain flow by removing obstructions, grit, grease, and build-up of other materials using flushing equipment. The sewer collection system crew completes approximately 1,200 feet of pipeline cleaning on a monthly basis. These activities are scheduled by the Public Works Department and work completed is documented on log sheets maintained by public works staff.
 “Hot-Spot” Sewer Cleaning:
 There are currently 6 areas in the collection system that requires routine sewer cleaning. A description of these areas and the maintenance frequency are summarized in Section 7 of this SSMP.
 The completed work is documented on log sheets maintained by public works staff.
 As-Needed Sewer Inspections:
 As needed, the City crews subcontract a CCTV crew to inspect pipelines in an effort to monitor known troubled areas. The reports and videos are filed in the Public Works Department.
 Lift Station Inspections & Maintenance:

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G:\City Engineer\ENG1\SEWER\Sewer System Management Plan (SSMP)\2023 Update\Documents\SSMP March 2023.docx  The City’s lift stations are inspected and maintained on a weekly basis. The logs documenting the inspection and maintenance are maintained at each lift station site by public works staff.
 Customer Complaints:
 The public works staff fills out a complaint form each time a sewer complaint is received and maintains documentation of the complaint along with the resolution in the Public Works Department.

5.3 Rehabilitation and Replacement Plan
Ripon has not experienced many structural problems with the pipeline system. When a problem is discovered, an assessment is performed of the suspect area, including visual and TV inspections of manholes and sewer pipes. Funds are budgeted in the Capital Improvement Program (CIP) for the City’s rehabilitation and replacement plan based on specific project needs. The prioritization of these projects is based on sewer pipes that are at risk of structural failure or prone to more frequent blockages. At this time, no sewer improvements are planned in the short term as the system is functioning well. Future improvements will be included in the City’s 5-Year CIP as needed.

5.4 Training
The City provides the following training for the sewer collection system staff:
 Operation of flushing equipment
 Operation and maintenance of collection system
 Operation and maintenance of lift stations
 Confined space
 SSO spill containment and cleaning
 SSO Emergency Response Plan
Training records are kept in the Public Works Department.

5.5 Contingency Equipment and Replacement Inventories
The City maintains contingency equipment and replacement parts for the wastewater system. The equipment and spare parts are stored at the City’s wastewater treatment plant, including:
 Hydro trucks (1)
 Combination vacuum/hydro flushing trucks (2)
 6-inch portable pump (1)
 55 KW portable generator (1)
 Spare pump for each lift station (1 ea)
 Spare control components for lift stations
 Various sized sewer plugs
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G:\City Engineer\ENG1\SEWER\Sewer System Management Plan (SSMP)\2023 Update\Documents\SSMP March 2023.docx The spare parts inventory is stored and maintained according to manufacturer specifications.

Through the use of spare parts, backup pumps and electrical generators, the City can readily deal with equipment failures at any of the pumping stations. The City can also readily repair any pipeline collapse that may occur for any pipe size up to 12-inch in diameter. In addition to spare parts on hand, there are a number of suppliers in the area where the City can obtain replacement equipment and material 24 hours per day, 7 days per week. 6 Design and Performance
GWDR Requirement:
(a) Design and construction standards and specifications for the installation of new sanitary sewer systems, pump stations, and other appurtenances; and for the rehabilitation and repair of existing sanitary sewer systems; and (b) Procedures and standards for inspecting and testing the installation of new sewers, pumps, and other appurtenances and for rehabilitation and repair projects.

The City maintains Standards and Specifications for the installation, inspection, and testing of new sanitary sewer systems, pump stations, appurtenances and for the rehabilitation and repair of existing sanitary sewer systems. The City’s Standards and Specifications are available on the City’s website at www.cityofripon.org/city_hall/departments/engineering.

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GWDR Requirement:

The collection system agency shall develop and implement an overflow emergency response plan that identifies measures to protect public health and the environment. At a minimum, this plan must include the following:
a. Proper notification so that the primary responders and regulatory agencies are informed of all SSOs in a timely manner;
b. A program to ensure an appropriate response to all overflows; c. 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 water of the State in accordance with the 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; d. Procedures to ensure that appropriate staff and contractor personnel are aware of and follow the Emergency Response Plan and are appropriately trained; e. Procedures to address emergency operations, such as traffic and crowd control and other necessary response activities;and
f. 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 for the SSOs, including such accelerated or additional monitoring as may be necessary to determine the nature and impact of the discharge.

The City of Ripon’s Overflow Emergency Response Plan is attached as Appendix D.

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GWDR Requirement:

The collection system agency shall evaluate its service area to determine whether a fats, oils, and grease (FOG) control program is needed. If an Enrollee determines that a FOG program is not needed, the Enrollee must provide justification as to 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:
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 and/or additional facilities needed to adequately dispose of FOG generated within a sanitary sewer system service area;
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 removal devices, maintenance requirements, BMP requirements, record keeping and reporting requirements; e. Authority to inspect grease producing facilities, enforcement authorities, and whether the Enrollee has sufficient staff to inspect and enforce the FOG ordinance; f. An identification of sanitary sewer system sections subject to FOG blockages and establishment of a cleaning maintenance schedule for each section; g. 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.

The City of Ripon has had very few related FOG related stoppages or overflows. The incidents that have occurred have been limited to specific “hot-spot” areas in town.

Therefore, it has been deemed that a limited FOG control program was needed, which includes the components described below.

8.1 Public Education and Outreach
The City plans performs educational measures targeted towards businesses that contribute to the FOG related incidents in hot-spot areas. This public outreach consists of mailing a letter to each business with facts and suggestions related to FOG issues and how they can help prevent overflows.

8.2 Legal Authority
One of the main components for controlling FOG from nonresidential facilities is the requirement for installing FOG removal devices. The City is standardizing its procedure Sewer System Management Plan City of Ripon
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G:\City Engineer\ENG1\SEWER\Sewer System Management Plan (SSMP)\2023 Update\Documents\SSMP March 2023.docx of requiring grease removal devices based on the most recent version of the Plumbing Code (referenced as part of RMC 13.08.130) for food service establishments and for tenants who make major improvements to their kitchen area.

In addition, the City has the legal authority to require that businesses continuously maintain in satisfactory and effective operation any pretreatment facilities and provides the authority to inspect those facilities (RMC 13.13.080 and 13.13.090).

8.3 FOG Removal Devices
One of the main components for controlling FOG from nonresidential facilities is the requirement for installing FOG removal devices. The City requires new businesses and those that make major improvements to their kitchen area to install grease removal devices according to the most recent plumbing code. A FOG removal device can either be a grease trap or interceptor, depending on the location or the size of the tenant improvement. The size and type of grease removal device are also predicated on the flow volume of the business.

8.4 Inspection and Enforcement Authority
The City currently has the legal authority to inspect and enforce pretreatment facilities.

The RMC section 13.13.090 requires that access be provided to the City Engineer for the purpose of inspecting, sampling, records examination or in the performance of those duties.

The City will perform inspections for areas and/or specific businesses that are believed to contribute FOG discharge to the system that further exacerbates any stoppage in the collection system. The City’s collection system crews will identify those areas or businesses that may be the source. Subsequently, the City will inspect the targeted areas/businesses to determine if one or combination of the following remedies is required:
enforcement actions, increased maintenance by the business, or public outreach.

8.5 Identification of FOG Blockages and Establishment of Maintenance Schedules
The City has identified the locations that routinely contain heavy concentrations of FOG, which require routine cleaning of the sewer lines. These grease blockage areas or locations are commonly known as “hot-spots”. The City has identified the following locations and cleaning schedule, as shown in Table 3.

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G:\City Engineer\ENG1\SEWER\Sewer System Management Plan (SSMP)\2023 Update\Documents\SSMP March 2023.docx Table 3 – FOG Locations and Maintenance Summary
Location Maintenance Schedule
Stockton Ave and Main St Quarterly
99 Sewer Crossing at Stockton Ave Quarterly
99 Sewer Crossing at Acacia Ave Quarterly
99 Sewer Crossing at Second St Quarterly
Industrial Ave and 4th St Quarterly
Locust Ave and Acacia Ave (easement) Quarterly
The City intends to maintain this schedule since it has been successful in preventing SSOs due to FOG. The City is planning to conduct more public outreach and education to the areas or locations that require additional maintenance as a result of FOG, as previously described or implement a rehabilitation program to reduce sewer stoppages.

8.6 Source Control Program
The City’s source control program primarily consists of the requirement to install grease removal devices for new businesses that produce grease and tenants who make major improvements to their site.

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GWDR Requirement:

The Collection system agency shall prepare and implement a capital improvement plan (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 plan must include:
(a) 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 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; and
(b) Design Criteria: Where design criteria do not exist or are deficient, undertake the evaluation identified in (a) above to establish appropriate design criteria; and (c) Capacity Enhancement Measures: The steps needed to establish a short-and longterm 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; and
(d) Schedule: The Collection system agency shall develop a schedule of completion dates for all portions of the capital improvement program developed in (a)-(c) above. This schedule shall be reviewed and updated consistent the SSMP review and update requirements.

9.1 Capacity Evaluation
The major objective of the City’s Master Plan is to develop a comprehensive planning document that can be utilized by City staff to identify and implement required improvements to the existing sewer system, as well as expansion of wastewater infrastructure to serve new developments consistent with the General Plan. The City’s Sanitary Sewer System Master Plan and Storm Drain System Master Plan (master plans) were both updated in 2010. The Master Plans identify the expected number of additional wastewater and storm drain facilities, potential locations for those facilities, and locations for the disposal of treated effluent. Since development of the master plans in 2010, little population growth has occurred. Therefore the 2010 master plans are still utilized by the City for planning purposes.

The sewer system is evaluated to determine the capacity of its major trunk (larger) sewer pipes using a hydraulic model. The hydraulic analysis is used to determine the bottlenecks within the sewer system for which improvements will be recommended.

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9.2 Design Criteria
The City’s sewer design criteria are included in the City of Ripon Standards and Specifications.

9.3 Capacity Enhancement Measures
The City’s approach is to prioritize, plan, and implement projects for any identified capacity enhancement needs based on capacity, condition, and risk assessment. These conditions are then incorporated into a CIP that is revised at least every 5 years along with the financing mechanism for each project.

9.4 Capital Improvement Plan Schedule
The list of improvement projects are prioritized and included in a CIP that is revised and updated at least every 5 years.

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GWDR Requirement:

The collection system agency shall:
(a) Maintain relevant information that can be used to establish and prioritize appropriate SSMP activities;
(b) Monitor the implementation and, where appropriate, measure the effectiveness of each element of the SSMP;
(c) Assess the success of the preventative maintenance program; (d) Update program elements, as appropriate, based on monitoring or performance evaluation; and
(e) Identify and illustrate SSO trends, including: frequency, location, and volume.

The City tracks several performance measures through tracking logs and annual reports.

In order to monitor the effectiveness of the SSMP, the City has selected certain specific parameters that can be documented and compared on an annual basis. These parameters were selected because they are straightforward, quantitative, and focused on results.

Changes in these parameters over time will indicate the overall success of the SSMP; or conversely, underlying conditions that can then be investigated further. The actions or measures of program effectiveness are shown in Table 4.

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G:\City Engineer\ENG1\SEWER\Sewer System Management Plan (SSMP)\2023 Update\Documents\SSMP March 2023.docx Table 4 – FOG Locations and Maintenance Summary
SSMP Element Summary of Element
Purpose
Actions or Measures for
Tracking Effectiveness Responsibility
Goals Reduce overflows Not needed N/A
Organization
Establish the hierarchy and assign
responsibility within the
organization
Review, update and adjust based
on organizational changes City Engineer
Legal Authority
Ensure the City has sufficient legal
authority to properly maintain the
system
Modify as needed City Engineer
Operation and
Maintenance
Program
Minimize blockages and reduce
SSOs by properly maintaining the
system and keeping the system in
good condition
 Update collection
system map
 Length of routine sewer
cleaning
 Length of “Hot Spot”
sewer cleaning
 Length of pipe CCTV’d
and inspected
 Lift station inspections
& maintenance
 Customer complaints
and resolution
 Training records
PW Director
Design and
Construction
Standards
Ensure new facilities are properly
designed and constructed Modify as needed City Engineer Overflow
Emergency
Response Plan
Provide timely and effective
response to SSO emergencies and
comply with regulatory reporting
requirements
 Total number and
volume of SSOs
 Number and repeat
SSOs
 Total number of
mainline blockages
Regulatory
Compliance Lead
Fats, Oils & Grease
Control
Minimize blockages and overflows
due to FOG
 Public outreach efforts
 Number of Facility
inspections
PW Director
Capacity
Management
Minimize SSOs due to insufficient
capacity by evaluating system
capacity and implementing
necessary projects
 CIP updates
 Master plan updates
 Total length of pipe
replaced/rehab’d
City Engineer
Monitoring,
Measurement &
Program
Modifications
Evaluate effectiveness of SSMP,
keep SSMP up-to-date, and
identify necessary changes
As needed City Engineer
Program Audits
Review the program and
effectiveness and make necessary
changes to comply with the
requirements
Formally audit the program
every two years City Engineer
Communication
Program
Evaluate the effectiveness of
communication program and
identify necessary changes
As needed Regulatory
Compliance Lead
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G:\City Engineer\ENG1\SEWER\Sewer System Management Plan (SSMP)\2023 Update\Documents\SSMP March 2023.docx 11 SSMP Program Audits
GWDR Requirement:

The collection system agency shall conduct periodic, internal audits, appropriate to the size of the system and 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 your agency’s compliance with the SSMP requirements, including identification of any deficiencies in the SSMP and steps to correct them.

The City will audit the SSMP at least every two years. The audit will evaluate how well the program accomplished the program goals established, and whether the program, as implemented, is effective overall. If deficiencies or modifications are identified as part of the audit, the SSMP will be updated accordingly. The audit report will be filed documenting the audit and kept on file at City Hall.
12 Communication Program
GWDR Requirement:

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

The City of Ripon is committed to communicating on a regular basis with interested parties on the implementation and performance of the SSMP. The most current version of the SSMP shall be posted on the City’s website (www.cityofripon.org/engineering) where the public can be made aware of the SSMP and its performance. This will provide an opportunity to receive comments from the public.

A resolution adopting the SSMP is attached in Appendix E.

Sewer System Management Plan City of Ripon
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G:\City Engineer\ENG1\SEWER\Sewer System Management Plan (SSMP)\2023 Update\Documents\SSMP March 2023.docx

APPENDIX A
SSMP Change Log
Date SSMP
Element/
Section
Description of Changes/Revision Made Change Authorized
By:
1/9/23 8 Redefined SSO classification per Waterboard’s
new definitions
Christiana Giedd
2/27/23 3 Modified org chart and chain of
communication to match current staffing
Christiana Giedd
Sewer System Management Plan City of Ripon
03/14/2023 22
G:\City Engineer\ENG1\SEWER\Sewer System Management Plan (SSMP)\2023 Update\Documents\SSMP March 2023.docx

APPENDIX B
Ripon Municipal Code Excerpts
Sewer Connections 214 9/09

13.08.010
Chapter 13.08

SEWER CONNECTIONS
Sections:

13.08.010 Compliance with Sewer
Regulations Required.

13.08.020 Construction Standards.

13.08.030 Connection Required When.

13.08.040 Connection Compliance
Required.

13.08.050 Permit - Required.

13.08.060 Permit - Application.

13.08.070 Permit - Conditions for
Revocation.

13.08.080 Responsibility for Damage to
Sewers-repair.

13.08.090 Unlawful connections.

13.08.100 Unlawful deposit.

13.08.110 Notice to Connect.

13.08.120 Licensed Plumbers or
Contractors Required.

13.08.130 Inspection Required.

13.08.010 Compliance with Sewer Regulations
Required.

A. For the purpose of this chapter, a public
sewer shall be deemed to be available to a building
if such sewer is within two hundred fifty (250) feet
of the nearest property line of the lot upon which
such building is located.

B. Pursuant to the authority of Section 4762 of
the Health and Safety Code of the state, the city
finds and declares that the maintenance or use of
private sewage disposal systems constitutes a public
nuisance and finds it to be in the public interest that properties to which a public sewer is available be
required to connect thereto. (Ord. 776 §1, 2009)

13.08.020 Construction Standards.

The city has adopted standard specifications and
details for construction of sewers and appurtenances,
which are on file in the office of the City Engineer.

Said standard specifications and details are referred
to and made a part of this code by reference as well
as the most recent version of the Uniform Plumbing
Code. For good cause, the City Engineer may, in
his sole discretion, allow deviations from the
adopted standard specifications and details. (Ord.
776 §1, 2009)

13.08.030 Connection Required When.

A. When a public sewer becomes available, as
defined in Section 13.08.010, to a building served
by a private sewage disposal system, the owner
shall connect the building to the public sewer
within six (6) months after public sewer is
available. This time frame may be extended by the
City Engineer, in his sole discretion, upon a
showing of good cause.

B. Where septic tanks or any private septic
systems or equipment are abandoned as a result of
connecting any building to the public sewer, the
owner of the property to which such connection is
made shall properly abandon all such tanks,
systems or equipment according to all state and
local regulations within ninety (90) days after the
time of connecting to the public sewer. (Ord. 776
§1, 2009)

13.08.040 Connection Compliance Required.

A. All connections of private drains or sewers
within the public sewer of the city shall be made in
accordance with this chapter and at the places
designated by the City Engineer.

B. All maintenance of a building connection
between the building and the city sewer main is the
responsibility of the lot owner or appropriate
owner's association exclusive of the city sewer
main.

C. Whenever any building connection is
broken such that earth and other materials must be
removed to remove the stoppage between the
building sewer system and the city sewer main, said
condition shall constitute a public nuisance, and the
repair must be completed within two (2) days from
the date of discovery of the breakage. If this is not
completed within this specified time frame, the City
Engineer may cause the deficiency to be abated and
cause the cost of such abatement to be made a lien
Sewer Connections 215 9/09

13.08.040
upon the affected property, which lien may be
foreclosed in court or collected together with the
regular property taxes on said property. (Ord. 776
§1, 2009)

13.08.050 Permit - Required.

A. No person or corporation shall make any
connection with any part of the public sewers or
opening into such public sewers without the written
permit of the City Engineer.

B. Nothing contained in this chapter shall be
deemed to require the application for, or the
issuance of, a permit for the purpose of removing
stoppages or repairing leaks in a building or sewer
lateral, except when it is necessary to replace any
part of such sewer. (Ord. 776 §1, 2009)

13.08.060 Permit - Application.

Except as provided in Section 13.08.050, any
person desiring to perform work involving sewers
shall make a request in writing to the city, providing
specific details of the proposed work and any other
such information as the city may require. The work
to be performed shall be done in accordance with
city standards and codes. Approval of the proposed
work will be issued in the form of an encroachment
permit, a building permit, approved subdivision
plans or other permit applicable to the overall
project involved. The applicant shall pay all such
permit and inspection fees associated with the
approval. (Ord. 776 §1, 2009)

13.08.070 Permit - Conditions for Revocation.

All permits to connect with the sewers shall be
given upon the express conditions that the city
engineer may at any time before the work is
completed revoke and annual the same unless the
work is done in accordance with the provisions of
this chapter. No person or party interested shall
have any right to claim damages in consequence of
such permit being revoked or annulled. Such work
shall be done strictly in accordance with the terms
of the permit. (Ord. 776 §1, 2009)

13.08.080 Responsibility for Damage to
Sewers-repair.

A. The applicant to whom a permit for construction
has been issued and the person performing the work
under such permit shall be liable for all damages.

Such applicant shall hold the city and its employees
and agents harmless from all loss, including
expenses incurred in defending any action against
the city arising out of such construction work.

B. The applicant shall be liable for defects in
the work and for any failure, which may develop in
the facilities because of defective work or materials.

C. The cost of repairing the damage if not paid
by the person causing the same within thirty days
shall become a lien upon the property owned or
occupied by the person causing the damage, and
may be foreclosed in the same manner as claims for
labor or materials under the lien laws of the state,
except that no equity of redemption shall apply.
(Ord. 776 §1, 2009)

13.08.090 Unlawful connections.

No person or corporation shall connect any
open gutter, cesspool, privy, vault or cistern with
any public sewer or with any private sewer
connecting with a public sewer. (Ord. 35 § 10,
1949)

13.08.100 Unlawful deposit.

No person or corporation shall deposit any
garbage, offal, dead animals, sand, rags, potato
peelings, vegetable offal, or any substance having a
tendency to obstruct the flow of sewage in any
manhole, water closet, sink, or any other plumbing
fixture or fixtures connected with the sewer system
of the city. This provision shall apply to garbage
disposal units connected with the public sewers.
(Ord. 35 § 10, 1949)

13.08.110 Notice to Connect.

A. It shall be the duty of the City Engineer to
notify in writing all persons owning or occupying,
Sewer Connections 216 9/09

13.08.100
or having under his or her control any premises
situated or being within two hundred fifty feet of a
public sewer in the city, where the City Engineer
has determined that the premises are in an unsafe
condition, to connect their private drains, water
closets, basins, sinks, baths, and other plumbing
fixtures with such sewer in the manner provided for
in this chapter.

B. Any person owning or occupying, or having
under his or her control any premises as provided in
this section who shall fail, refuse or neglect to
commence work within ten days from the date of
service of the aforesaid notice and diligently and
without interruption prosecute the same to
completion shall forfeit as a penalty therefore the
sum of twenty-five dollars for each day's delay in
commencing the work after the expiration of the ten
days' notice as aforesaid and after commencement
thereof. Such penalty shall be recovered for the use
of the city by prosecution and the court having
jurisdiction thereof, and shall be paid into the
treasury of the city to the use of the city. Should the owner or occupant or person having under his or her
control such premises still fail, neglect or refuse to
connect their private drains, sinks and privies with
such sewer the City Engineer may order the
performance of the work and the costs thereof shall
be recoverable in an action brought in the name of
the city for such purpose or the costs of such work
may be paid from moneys recovered as a penalty
under this section. (Ord. 776 §1, 2009)

13.08.120 Licensed Plumbers or Contractors
Required.

No person or persons except licensed plumbers
or contractors or one to whom a permit has been
especially granted by the city for the doing of such
work shall be permitted to connect any private drain
from any building premises or fixtures with the
public sewer system of the city. (Ord. 776 §1, 2009)

13.08.130 Inspection Required.

No connection with the public sewers shall be
completed or covered until an opportunity for
inspection has been afforded to the City Engineer or
his designee, and any work covered or concealed
prior to inspection shall be uncovered and opened at
the expense of the person so covering or concealing
the same, provided that in all of the connections
with the public sewers, all work shall be done in
accordance with the most recent plumbing code
adopted as the official code of the city by the city
council, copies of which most recent plumbing code
are on file in the office of the city clerk, and are
available for inspection as to the requirements
pertaining to such work. (Ord. 776 §1, 2009)
Public Domestic Sanitary Sewers (Ripon 12/94) 223 - 1

13.13.010
Chapter 13.13

PUBLIC DOMESTIC SANITARY SEWERS
Sections:

13.13.010 Definitions.

13.13.020 Drainage into Sanitary Sewers
Prohibited.

13.13.030 Types of Wastes Prohibited.

13.13.040 Interceptors Required.

13.13.050 Maintenance of Interceptors.

13.13.060 Pretreatment

13.13.070 Prelinimary Treatment of
Wastes.

13.13.080 Maintenance of Pretreatment
Facilities.

13.13.090 Inspection.

13.13.100 Confidential Information.

13.13.110 Control Manholes.

13.13.120 Measurement and Tests.

13.13.130 Wastewater Discharge.

13.13.140 Industrial Wastewater Permit.

13.13.150 Industrial Wastewater
Permit—Nontransferable.

13.13.160 Special Agreements.

13.13.170 Swimming Pools.

13.13.180 Storm Sewers Required.

13.13.190 Control of Objectionable
Wastes.

13.13.200 Federal Categorical
Pretreatment Standards.

13.13.210 State Requirements.

13.13.220 Inconsistency with Other
Ordinances.

13.13.010 Definitions.

Unless the context specifically indicates
otherwise, the following terms and phrases as used
in this chapter shall have the meanings designated
in this section:

A. "Authorized representative of industrial
user" may be: a principal executive officer of at
least the level of vice president, a general partner
or proprietor, a duly authorized representative of
the individual designated above if such
representative is responsible for the overall
operation of the facilities from which the
discharge originates.

B. "City Engineer" means the city engineer
of the City of Ripon, or such other person as may
be designated by the city engineer to perform any
service or make any determinations permitted or
required in this chapter to be made by the city
engineer.

C. "Domestic wastewater" means water
deposited, released or discharged into a sewer
system from any commercial or residential source
which may contain human or animal excreta.

D. "Industrial wastewater" means all watercarried wastes, and wastewater of the city, excluding domestic wastewater, and shall include
all wastewater from any producing,
manufacturing, processing, institutional,
commercial, service, agricultural, or other
operation. These wastewaters shall not include
wastes of human origin similar to domestic
wastewater.

E. "Permittee" means the person to whom a
permit has been issued pursuant to this chapter.

F. "Person" means any individual,
partnership, firm, company, corporation,
association, governmental entity or other legal
entity or their legal representatives, agents or
assigns.

G. "Pretreatment" means the reduction of the
amount of pollutants, the elimination of pollutants
or the alteration of the nature of pollutant
properties in wastewater to a less harmful state
prior to or in lieu of discharging into the city
POTW.

H. "Publicly owned treatment works
(POTW)" means the city wastewater collection,
transmission, treatment and disposal facilities.

This definition includes any sewers that convey
wastewater to the treatment facility.

I. "User" means any person who contributes,
causes or permits the contribution of wastewater to
the city POTW. (Ord. 529 § 1, 1994)
Public Domestic Sanitary Sewers (Ripon 12/94) 223 - 2

13.13.020

13.13.020. Drainage into Sanitary Sewers
Prohibited.

A. No leaders from roofs and no surface
drains for rain water shall be connected to any
sanitary sewer.

B. No surface or subsurface drainage, rain
water, storm water, seepage, cooling water, or
unpolluted industrial process waters shall be
permitted to enter any sanitary sewer by any
device or method whatsoever.

C. Unpolluted water such as single pass
cooling water, will not be discharged through
direct or indirect connection to a city sewer
without approval from City Engineer.

D. When the City Engineer determines that a
user may be or is contributing to the POTW any of
the substances enumerated in this section in such
amounts as to interfere with the operation of the
POTW, the City Engineer shall develop effluent
limitations for such user to correct the interference
with the POTW. (Ord. 529 § 1, 1994)

13.13.030. Types of Wastes Prohibited.

No user shall contribute or cause to
contributed directly or indirectly, any pollutant or
waste water which will interfere with the operation
of the publicly owned treatment works (POTW).

Except as hereinafter provided, no user shall
discharge or cause to be discharged any of the
following described waters or wastes to any
domestic sewer:

A. Any liquids, solids, or gases which by
reason of their nature or quantity are, or may be,
sufficient either alone or by interaction with other
substances to cause fire or explosion or be
injurious in other way to the POTW.

B. Any liquid or vapor having a temperature
higher than 150 F.

C. Any water or waste which may contain
more than 50 parts per million, by weight, of
floating or soluble fat, oil, or grease.

D. Prohibited materials include but are not
limited to: gasoline, kerosene, naphtha, benzene,
toluene, xylene, ethers, alcohols, ketones,
aldehydes, peroxides, chlorates, perchlorates,
bromates, carbides, hydrides, sulfides, naphtha,
fuel oil, and any other substances, solid or gas,
which the City Engineer has notified the user is a
fire or explosion hazard to the POTW.

E. Any garbage that has not been properly
shredded. Properly shredded garbage shall mean
the wastes from the preparation, cooking, and
dispensing of food that has carried freely under the
flow conditions normally prevailing in the
domestic sewers, with no particle greater than
three eights (3/8) inch in any dimension. All
shredded particles shall be carried freely under the
flow conditions prevailing in the POTW.

F. Any ashes, cinder, sand, mud, straw,
shavings, metal, glass, rags, feathers, tar, plastics,
wood, paunch manure, pulp, cement, tar, asphalt,
resins, or any other solid or viscous substances
capable of causing obstruction to the flow in
sewers or other interference with the proper
operation of the POTW.

G. Any waters or wastes having a pH lower
than 5.5 or higher than 9.0 or having any other
corrosive property capable of causing damage or
hazard to structures, equipment, and personnel of
the sewage works.

H. Any water or wastes containing a toxic or
poisonous substance in sufficient quantity to
injure or interfere with any sewage treatment
process, constitute a hazard to human or animals,
or create any hazard in the receiving waters of the
sewage treatment plant, including but not limited
to cyanides in excess of (2) mg/l as CN in the
wastes as discharged to the domestic sewer.

I. Any waters or wastes containing
suspended solids or dissolved matter of such
character and quantity that unusual attention or
expense is required to handle such materials in the
POTW.

J. Any noxious or malodorous gas or
substance capable of creating a public nuisance.

K. Any septic tank sludge.

L. Any radioactive waste.

M. Any water or waste containing more than

0.5 milligrams per liter dissolved sulfides.

Public Domestic Sanitary Sewers (Ripon 12/94) 223 - 3

13.13.030
N. Any substance which will cause damage
or imbalance to any portion of the treatment or
sludge disposal process.

O. Any substance which will cause the
POTW to violate any state or federal disposal
system conditions or receiving water quality
standards.

P. Any pollutants, including oxygen
demanding pollutants (BOD, etc.) released at a
flow rate and/or concentration which will cause
interference to the POTW. (Ord. 529 § 1, 1994)

13.13.040. Interceptors Required.

Grease, oil, and sand interceptors shall be
provided when, in the opinion of the City
Engineer, they are necessary for the proper
handling of liquid wastes, sand, and other harmful
ingredients; except that such interceptors shall
normally not be required for buildings used for
residential purposes. All interceptors shall be of a
type and capacity approved by the City Engineer
and shall be located as to be readily and easily
accessible for cleaning and inspection. (Ord. 529
§ 1, 1994)

13.13.050. Maintenance of Interceptors.

All grease, oil, and sand interceptors shall be
subject to inspection by the City Engineer at any
reasonable time. If the City Engineer determines
maintenance is needed, it shall be done at owner's
expense as directed by the City Engineer. (Ord.
529 § 1, 1994)

13.13.060. Pretreatment.

Users shall provide necessary pretreatment
facilities to comply with this chapter and federal
and state standards. (Ord. 529 § 1, 1994)

13.13.070. Preliminary Treatment of Wastes.

The admission into the public domestic
sanitary sewers of any waters or wastes having
A. A 5-day Biochemical Oxygen Demand
greater than 300 parts per million by weight; or
B. containing more than 350 parts per million
by weight of suspended solids; or
C. containing any quantity of substance
having the characteristics described in Section

13.13.030; or
D. having an average daily flow greater that
two percent (2%) of the average daily sewage flow
of the city, shall be subject to the review and
approval of the City Engineer.

Where necessary in the opinion of the City
Engineer, the owner shall provide, at his expense,
such preliminary treatment as may be necessary
to:

A. reduce the Biochemical Oxygen Demand
to 300 parts per million by weight; or
B. reduce objectionable characteristics or
constituents to within the maximum limits
provided for in Section 13.13.030; or
C. control the quantities and rates of
discharge of such waters or wastes.

Plans, specifications, and any other pertinent
information relating to proposed preliminary
treatment facilities shall be submitted for the
approval of the City Engineer and of the
California Regional Water Quality Control Board,
Central Valley Region and no construction of such
facilities shall be commenced until said approvals
are obtained in writing. (Ord. 529 § 1, 1994)

13.13.080. Maintenance of Pretreatment
Facilities.

Where preliminary treatment facilities are
provided for any waters or wastes, they shall be
maintained continuously in satisfactory and
effective operation by the owner at his expense. If
the owner does not correct the deficiency
forthright, the City Engineer shall have work done
at the property owner's expense. (Ord. 529 § 1,
1994)

13.13.090. Inspection.

The City Engineer shall inspect the facilities of
any user to ascertain whether the purpose of this
chapter is being met. Persons or occupants of
premises where wastewater is being created or
discharged shall allow the city easy access at all
Public Domestic Sanitary Sewers (Ripon 12/94) 223 - 4

13.13.090
reasonable times, to all parts of the premises for
the purpose of inspection, sampling, records
examination or in the performance of any of these
duties. (Ord. 529 § 1, 1994)

13.13.100. Confidential Information.

A. Information and data on a user obtained
from reports and permit applications shall be
available to the public or other governmental
agencies without restriction, unless the user
specifically requests and is able to demonstrate to
the satisfaction of the City Engineer that the
release of such information would divulge
information, processes or methods of production
entitled to protection as trade secrets of the user.

B. The portions which might disclose trade
secrets or secret processes shall not be made
available for inspection by the public but shall be
made available upon written request to
government agencies for uses related to this
chapter, the national pollutant discharge
elimination system, state disposal system permit,
or the pretreatment program. (Ord. 529 § 1, 1994)

13.13.110. Control Manholes.

When required by the City Engineer, the
owner of any property served by a side sewer
carrying industrial wastes shall install a suitable
control manhole in the side sewer to facilitate
observation, sampling, and measurement of
wastes. Such manhole, when required, shall be
accessible and safely located, and shall be
constructed in accordance with plans approved by
the City Engineer. The manholes shall be
installed by the owner at his expense, and shall be
maintained by him so as to be safe and accessible
at all times. (Ord. 529 § 1, 1994)

13.13.120. Measurement and Tests.

All measurements, tests, and analysis of the
characteristics of waters and wastes to which
reference is made in Sections 13.13.030 and

13.13.070 shall be determined in accordance with
standard methods and shall be determined at the
control manhole provided for in Section

13.13.110, or upon suitable samples taken at said
control manhole. In the event that no special
manhole has been required, the control manhole
shall be considered to be the nearest downstream
manhole in the domestic sewer to the point at
which the side sewer is connected. (Ord. 529 § 1,
1994)
Section 13.13.130. Wastewater discharge.

It is unlawful to discharge to the city POTW
any waste prohibited or regulated by this chapter
or state or federal law without a permit to
discharge said waste issued by the city. (Ord. 529
§ 1, 1994)

13.13.140. Industrial Wastewater Permit.

All industrial users proposing to connect to or
to contribute to the POTW shall obtain an
industrial wastewater discharge permit. Permit
application shall be made on the form provided by
the city. Any existing user which the City
Engineer has reason to believe is discharging
prohibited or regulated materials shall apply for a
permit within thirty days of written notice. (Ord.
529 § 1, 1994)

13.13.150. Industrial Wastewater Permit--
Nontransferable.

An industrial wastewater discharge permit
shall not be reassigned or transferred or sold to a
new owner, new user, different premises or a new
or changed operation. (Ord. 529 § 1, 1994)

13.13.160. Special Agreements.

No statement contained in this Article shall be
construed as preventing any special agreement of
arrangement between the City Engineer and any
industrial concern whereby an industrial waste of
unusual, strength or character may be accepted by
the city for treatment, subject to payment therefore
by the industrial concern and subject to such terms
and conditions as might be required by the city.
(Ord. 529 § 1, 1994)
Public Domestic Sanitary Sewers (Ripon 12/94) 223 - 5

13.13.170

13.13.170. Swimming Pools.

It shall be unlawful for any person to
discharge the contents of a swimming pool into
sanitary sewer except in the manner specified in
this section. The size of pipe carrying discharge
water shall not be larger than two inches and shall
not be under head to exceed twenty (20) feet. If
the water is discharged by pumping, the rate of
flow shall not exceed one hundred (100) gallons
per minute. Each swimming pool discharging to
a sanitary sewer shall be equipped with an
approved separator to preclude any possibility of
a backflow of sewage into the swimming pool of
piping system. (Ord. 529 § 1, 1994)

13.13.180. Storm Sewers Required.

Storm water and all other unpolluted drainage
shall be discharged to such sewers as are
specifically designated as combined sewers or
storm sewers, or to a natural outlet approved by
the City Engineer. Industrial cooling water or
unpolluted process water may be discharged, upon
approval of the City Engineer to a storm sewer,
combined sewer, or natural outlet. (Ord. 529 § 1,
1994)

13.13.190. Control of Objectionable Wastes.

A. Actions Authorized. If any waters or
wastes are discharged or wasted or are proposed to
be discharged or wasted, to the domestic sewers,
which waters contain the substances or possess the
characteristics enumerated in sections 13.13.030
or this Article, and which in the judgement of the
City Engineer, may have deleterious effect upon
the sewerage works, processes, equipment, or
receiving waters, or which otherwise create a
hazard to life or constitute a public nuisance, the
City Engineer may:

1. Reject the wastes.

2. Require pretreatment to an acceptable
condition for discharge to the domestic sewers.

3. Require control over the quantities and
rates of discharge; and/or

4. Require payment of charges in accordance
with the following schedule or by special
agreement with the city to cover the added cost of
handling and treating the wastes, which charges
are in addition to all other applicable sewer
charges, fees, assessments, or taxes for sewer
service.

B. Rate Schedule. All persons discharging
waste into the sewer system in violation of section

13.13.040 and pursuant to determination by the
City Engineer of the requirement of this
subsection of Section 13.13.190 and provided that
no special agreement has been reached hereunder,
shall pay a service charge to the city for use of
treatment facilities and said service charge shall be
based on the Biochemical Oxygen Demand of the
discharge, and the demand placed on the system,
the volume of such discharge, and such charge
shall be in accordance with rates outline in
Chapter 13.12.020 as amended, Ripon Municipal
Code.

C. Sampling. Provision of sampling of waste
water flow shall be provided at a readily
accessible location near the connection to the
domestic sewer.

D. Pollutant limitations. No person shall
discharge wastewater containing in excess of:

Substance lb./day
Antimony .25
Arsenic .25
Barium 5.00
Beryllium 2.50
Boron 5.00
Cadmium .005
Chromium .25
Copper 1.00
Cyanide .50
Iron 1.50
Lead .25
Manganese .25
Mercury -0-
Molybdenum .025
Nickel 2.50
Selenium .05
Silver .25
Tin 10.00
Vanadium .50
Zinc .40
Public Domestic Sanitary Sewers (Ripon 12/94) 223 - 6

13.13.190
E. Monitoring of Discharge. The city or its
agent shall take not less than one sample per
month for determination of analysis of waste to be
paid for by the person charged hereunder, and
which shall show the strength demand factors and
other factors as may be determined by the City
Engineer or its qualified agent. Additional
samples will be taken upon request and payment
therefor by the requesting person.

F. Discharge--Quantity.

1. The quantity of wastewater discharge for
new development shall be limited to the most
restrictive of the following:
a. The property's proportional share of the
serving sewer lines;
b. Maximum average daily flow of five
thousand gallons for each acre of site to be
developed;
c. Maximum daily flow shall not exceed ten
percent of the POTW remaining capacity.

2. If industrial development immediately
adjacent to the proposed development has
developed to a use less than that specified in
subdivision (b) of subsection (1) of this section,
additional capacity may be credited up to a
maximum of ten thousand gallons per acre per
day.

G. Discharge--Excessive. No use shall
increase the use of process water or in any way
attempt to dilute a discharge as a partial or
complete substitute for adequate treatment to
achieve compliance with the limitations of this
chapter or state and federal standards.

H. Discharge--Accidental.

1. Each user shall provide protection from
accidental discharge of prohibited material or
other substances regulated by this chapter.

2. In the case of accidental discharge, it is
the responsibility of the user to immediately
telephone and notify the POTW of the incident.

Failure to notify of an accidental discharge shall
be cause to disconnect service.

I. Violation--Suspension of Service.

1. The city may immediately suspend the
wastewater treatment service and/or an industrial
waste discharge permit of any user when such a
suspension is necessary, in the opinion of the city
engineer in order to stop an actual or threatened
discharge which presents or may present an
imminent or substantial endangerment to the
health or welfare of persons to the environment,
uses interference to the POTW or causes the city
to violate any condition of its discharge permit.

2. Any person notified of a suspension of
wastewater treatment service shall immediately
stop or eliminate the contribution. In the event of
a failure to comply voluntarily with the suspension
order, the City Engineer shall take such steps
deemed necessary including severance to the
sewer connection to prevent or minimize damage
to the POTW or endangerment to any individuals
or the environment.

3. The City Engineer shall reinstate the
industrial waste discharge permit and/or the
wastewater treatment service upon proof of the
elimination of the noncomplying discharge and
payment of any costs incurred by the city to
disconnect the service.

4. A detailed written report describing the
causes of the harmful contribution and the
measures taken to prevent any future occurrence
shall be submitted to the City Engineer within
fifteen days of the date of occurrence.

J. Revocation of permit. Any user who
violates the following conditions of this chapter or
applicable state and federal regulations, is subject
to having their permit revoked in accordance with
Section 13.13.190 (i).

1. Failure to factually report the wastewater
constituents and characteristics of their discharge;

2. Failure to report significant changes in
operations, or wastewater constituents or
characteristics;

3. Refusal of reasonable access to users
premises for purpose of inspection of monitoring;

4. Violations of conditions of the permit.

K. Violation notification. Whenever the City
Engineer finds that user has violated or is violating
this chapter, wastewater contribution permit, or
any prohibition, limitation or requirements
contained in this chapter, the city may serve upon
such person a written notice
Public Domestic Sanitary Sewers (Ripon 12/94) 223 - 7

13.13.190
stating the nature of the violation. Within thirty
days of the date of notice a plan for correction
thereof shall be submitted to the City Engineer by
the user.

L. Sewage Charge a Lien, Authority to
Disconnect. Each charge or rental levied by, or
pursuant of this Ordinance on property within the
limit of the city, is hereby made a lien upon
corresponding premises served by a connection to
the sewerage system. In the event of failure of
payment of charge as provided herein for sewage
service for property located out of the city, the
secretary, or other authorized and directed to
disconnect such property from the sewage system.

M. Collection Charges: In order to facilitate
the payment of charges made in accordance with
the rate schedule in subsection (B) of this section,
each and every person being so charged shall be
billed for volume based on 80% of water
consumption shown on their last water billing. If
said water billing is for a greater or lesser period
of time than the period being billed for sewer
service, the average daily water consumption for
said water billing period will be used to determine
water consumption for the period of sewer service.

N. Design Approval. If the City Engineer
requires the pretreatment or equalization of waste
flows, the design and installation of the plants and
equipment shall be subject to the review and
approval of the City Engineer, and subject to the
requirements of all applicable codes, ordinances,
and laws.

O. Notice. Notice of violation of Section

13.13.030 shall be given by certified mail to the
person as shown on the last equalized assessment
roll of San Joaquin County for the parcel or
parcels discharging or causing to be discharged
said objectionable waste. Said notice shall inform
said person of violation of said Section 13.13.030
and that they have 15 days from the date of such
notice to contract the City of Ripon to make
arrangements satisfactory to the City Engineer
evidencing the necessary remedial action taken or
to be taken to prevent or control such violation.

Failure to respond will result in the
application of the rate schedule in Subsection (B)
from the date of such notice until the City
Engineer determines compliance with this
Ordinance, as now or hereafter amended. (Ord.
529 § 1, 1994)

13.13.200. Federal Categorical
Pretreatment Standards.

A. Upon the promulgation of federal
categorical pretreatment standards for a particular
industrial subcategory, any federal standard more
stringent than limitations imposed under this
chapter shall immediately supersede the
limitations imposed by this chapter.

B. Federal limitations for maximum of one
day shall be determined by grab samples;
limitation for average daily value for consecutive
days shall be measured by twenty-four-hour
composite samples. (Ord. 529 § 1, 1994)

13.13.210. State Requirements.

State requirements and limitations when
adopted shall apply when they are more stringent
than those in this chapter. (Ord. 529 § 1, 1994)

13.13.220. Inconsistency with Other
Ordinances:

The requirements of this ordinance when
adopted shall apply when they are more stringent
than those in this chapter. (Ord. 529 § 1, 1994)
Sewer System Management Plan City of Ripon
03/14/2023 23
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APPENDIX C
Ripon Sewer and Stormwater Maps
Sources: Esri, HERE, Garmin, USGS, Intermap, INCREMENT P, NRCan, Esri Japan, METI, Esri China (Hong Kong), Esri Korea, Esri (Thailand), NGCC, (c) OpenStreetMap contributors, and the GIS User Community Legend
Sewer Main Lines
Sewer Manholes
Lift Stations
Sewer Force Mains . City Limits
Document Path: G:\City Engineer\ENG1\SEWER\Sanitary Sewer Management Plan\2022 Update\Sewer2022.mxd Author: CG Date Saved: 12/22/2022 12:04:33 PM City of Ripon Stormwater System
Sources: Esri, HERE, Garmin, USGS, Intermap, INCREMENT P, NRCan, Esri Japan, METI, Esri China (Hong Kong), Esri Korea, Esri (Thailand), NGCC, (c) OpenStreetMap contributors, and the GIS User Community Legend
Storm Main Lines
Storm Manholes
Storm Catch Basins
Storm Laterals . City Limits
Document Path: G:\City Engineer\ENG1\SEWER\Sanitary Sewer Management Plan\2022 Update\StormDrain2022.mxd Author: CG Date Saved: 12/22/2022 11:54:18 AM City of Ripon Stormwater System
Sewer System Management Plan City of Ripon
03/14/2023 24
G:\City Engineer\ENG1\SEWER\Sewer System Management Plan (SSMP)\2023 Update\Documents\SSMP March 2023.docx

APPENDIX D
Overflow Emergency Response Plan
1 City of Ripon

SANITARY SEWER OVERFLOW (SSO)

EMERGENCY RESPONSE PLAN
January 2023
1 PURPOSE
The Overflow Emergency Response Plan (ERP) has been established to identify measures required in the event of a Sanitary Sewer Overflow (SSO) within the City of Ripon to protect public health, the environment, to insure proper notification of primary responders, and that regulatory agencies are notified of all SSO in a timely manner.
2 INVESTIGATION OF SSO REPORT
Once an SSO is reported, the Public Works Department shall:
 Immediately investigate the reported SSO.
 Verify and assess the type and extent of the SSO.
 Notify Public Works management of the spill and its assessment. 3 CONTAINMENT OF THE SSO SPILL
After the spill has been verified and assessed, the Public Works Department shall:
 Immediately contain the spill from spreading further.  Isolate storm drain system from the spill or if the spill has found its way into the storm drain system, isolate affected area of storm drain system so that spill does not access the river.
 Secure SSO spill site from public access.
2 4 CORRECTION OF CAUSE OF SSO
After the spill has been assessed and contained, the Public Works Department shall determine the cause of the SSO. The most common reasons for SSO are collection system blockages and lift station failures.

The Public Works Department shall take the following corrective action:
 Collection System Blockage:
o Use vacuum/hydro flushing truck to clear blockage. If possible use vacuum equipment to remove excessive solids.
o After the blockage is cleared, check downstream manholes to verify blockage did not relocate downstream.
o Check downstream Lift Station to verify station is operating properly with addition released flow and debris.
 Lift Station Power Failure:
o Use portable emergency generator to provide temporary power until power is restored.
 Lift Station Control System Failure:
o Use hand controls until the automatic control system is restored.  Lift Station Pump Failure:
o Repair or replace defective pump or pumps with spare pumps which are stored at the Public Works Corporation Yard. Portable emergency pump stored at the corporation yard, can also be used until pump can be place into operation. 5 CLEAN UP OF SSO SPILL
After correcting the SSO (or at the same time if possible), the Public Works Department shall cleanup the SSO spill in lines with the following procedures:
 Clean up all raw sewage with vacuum equipment.
 Pressure wash affected area of street, curb/gutter and storm drain system.  Disinfect affected areas, street, curb/gutter and storm drain system with chlorine water solution.
 All raw sewage; wash down, water and disinfect solution shall be collected by using vacuum equipment and delivered to the City of Ripon wastewater treatment plant for proper disposal.
 All soil affected by the SSO will be removed and delivered to the City of Ripon wastewater treatment plant for proper disposal.
 Biological sampling shall be performed on the affected areas of the storm drain system to ensure that it has effectively been clean.
3 6 NOTIFICATION REQUIREMENTS
There are three categories of SSO which have varying reporting requirements. The three categories are defined as shown in Table 1.

Table 1 – Spill Categories and Definitions
The Public Works Director or his designee shall report the spill to the proper outside agencies. Agencies to be notified are depended on the Category of spill as shown in Table 2. All occurrences of SSO shall be reported on the CIWQS Online SSO Database. If no SSO occurs in a given month, than a no-spill certification shall be submitted. Section 8 includes optional worksheets provided by the California Waterboard to assist with spill reporting.
4 Table 2 – Notification, Reporting, Monitoring, and Record Keeping Requirements 5 7 SSO TRAINING
To assure that the Public Works Maintenance Employees are aware of required SSO spill procedures all Public Works Maintenance Employees will be provide with annual training on SSO Emergency Response Plan (ERP), SSO spill containment technics, and clean up procedures.

Training records are maintained at the Public Works office. 6 8 SSO WORKSHEETS FROM THE CALIFORNIA WATERBOARD
36 2.6.7 Attachments

2.6.7.1 Sample Field Report

REPORTED BY
Call Address:

On Service Request _______________________________________________ (SR #____________________) Caller Name: ______________________________________ Phone: _________________ ______________ Receipt of Call: Date: ______/_____/_____ Time: _______:_______ AM PM Call Received By:
__________________
Call Dispatch: _______/_______/_______ Time:________:________ AM PM Assigned To:
________________________
USD Arrival Time: Date: ________/________/________ Time:_________:_______ AM PM

SPILL START TIME NOTES

Caller Interview: Where did you see sewage spill from? From: Manhole Inside Building C/O Wet well/Lift station Other____________________________________________ Time Caller noticed spill: _________:_________ AM PM Date: _________/__________/__________ Comments:
____________________________________________________________________________________ ____________________________________________________________________________________ Last time Caller observed NO Spill occurring: __________:__________ AM PM Date:
_________/________/________
Comments:
____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ ____________________________________________________________________________________ SSO End Time __________:__________ AM PM Date: _________/________/_________ Other Comments regarding spill start time:
37 _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________ _____________________________________________________________________________________

SPILL LOCATION
Observed: Spill from: Manhole ID______________ Lift Station ID _______________________ Clean Out Address
____________________________________________________________________________________ Comments:
____________________________________________________________________________________ Building Address
____________________________________________________________________________________ Comments:
____________________________________________________________________________________ Spill Destination: Building Paved Surface Storm Sys Curb/Gutter Unpaved Surface Water
If you answered no to both questions above, was it ≥ 1,000 gallons? _____ Yes _____ No If yes, the SSO is a Category 2. If NO, the SSO is a Category 3.

Answer these questions:
#1 – Was there a discharge to surface water or a drainage channel that is tributary to surface water? _____ Yes _____ No #2 - Was there a discharge to a storm drain pipe that was “NOT” fully captured & returned to the sanitary sewer system? _____ Yes ______No

38 SPILL VOLUME WORKSHEET
The purpose of this worksheet is to capture the data and method(s) used in estimating the volume of an SSO. Since there are many variables and often unknown values involved, this calculation is just an estimate.

Additionally, it is useful to use more than one method, if possible, to validate your estimate.

The following methods and tools are the approved methods in the SOP CS-103 SSO Response. Check all methods and tools that you used:
 Eyeball Estimate Method
 Measured Volume Method
 Duration and Flow Rate Method (Account for diurnal flow pattern for long duration)  USD SSO Flow Rate Estimating Tool
 Other (explain) i.e.; estimated daily use per capita upstream or meter @ Pump Station. ___________________________________________________________________________

_________________________________________________________________________________

_________________________________________________________________________________ Eyeball Estimate Method- Imagine a bucket(s) or barrel(s) of water tipped over.

Size of bucket(s) or
barrel(s)
How many of this
Size?
Multiplier Total Volume
Estimated
1 gal. water jug X 1
5 gal. bucket X 5
32 gal. trash can X 32
55 gal drum X 55
Total Volume Estimated
Using Eyeball Method
39 Measured Volume Method (this may take several calculation as may have to break down the odd shaped spill to rectangles, circles, and polygons) It is important when guessing depth to measure, if possible in several locations and use an average depth. Use the SSO Volume Estimate by Area Work Sheet , if necessary, to sketch the shapes and show your work.

1. Draw a sketch of the spill SSO Volume Estimate by Area Work Sheet, or use a photo copy of USD block book to draw on and attach it.

2. Draw shapes and dimensions used on your sketch

3. Use correct formula for various shapes
Rectangle L x W x D
Circle 3.14 x R² x D
Polygons see reference chart Show formula used
Duration and Flow Rate Method worksheet:

Start Date and Time 1.

End Date and time 2.

Total time elapsed of SSO event (subtract line
1 from line 2. Show time in minutes)

3. Average flow rate GPM (account for diurnal
pattern)

4. Total volume estimate using duration and flow
rate method (Line 3 x Line 4)

5. CAUSE OF SPILL
Spill Cause: Roots Grease Debris Vandalism Lift Station Fail Other _____________ Spill cause to be determined by CCTV inspection (Attach TV Report to this form) Final Cause Determination:
_______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ Follow-up or Corrective Action Taken:
_______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________

SPILL CONTAINMENT
Containment Implemented:___________:__________ AM PM Date: _________/_______/________ Containment Measures: Plugged Storm Drain Washed Down Vacuum Up Water/Sewage Other Measures: _____________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________ ___________________________________________________________________________________

CLEAN UP
Clean Up Begin: ________:________ AM PM Date: _______/______/________ Clean Up Complete: ________:________ AM PM Date: _______/______/________ Describe Clean Up Operations:
______________________________________________________________________________ ______________________________________________________________________________ ______________________________________________________________________________ __________________Gallons – Estimate Volume of Spill Recovered (do not count wash down water)

OTHER IMPORTANT MILESTONES
Contacted Supervisor: _____:_____ AM PM Date: _______/______/___________ Requested Additional EE’s/Equip:_____:_____ AM PM Date: _______/______/___________ Requested Additional EE’s/Equip:_____:_____ AM PM Date: _______/______/___________ Requested Additional EE’s/Equip:_____:_____ AM PM Date: _______/______/___________ Departure Time: _____:_____ AM PM Date: _______/______/___________ _________________________ _____:_____ AM PM Date: _______/______/___________ _________________________ _____:_____ AM PM Date: _______/______/___________ ________________________ _____:_____ AM PM Date: _______/______/____________

REPORTING
Report to Cal-EMA: Date:______ ___:___ AM PM (Cat.1 Only) (800) 852-7550 By: _____________ Control Number provided by Cal-OES: ______________________________________________ Name of Person Contacted: ________________________________ or Left Message:

Report to _____ Date:__________ ____:_____ AM PM Phone: 668-4200 By: _________________ Name of Person Contacted: ________________________________ or Left Message:

Notes:

Response Crew: _____________________, ______________________, _____________________ _____________________, _______________________, ______________________ SSO Volume by Area Estimation Work Sheet

44 2.6.7.2 SSO Volume by Area Estimation Work Sheet
Surface: Asphalt Concrete Dirt Landscape Inside Building Other _______________ (Draw / Sketch outline of Spill ‘Footprint’ and attach photos) ~~ Breakdown the ‘Footprint’ into Recognizable Shapes and Determine Dimensions of Each Shape ~~ Area #1_______________________________________________________________ % Wet _______ Stain. Depth1_____ Depth2 _____ Depth3 _____ Depth4 _____ Depth5 _____ Depth6 _____ Area #2_______________________________________________________________ % Wet _______ Stain. Depth1_____ Depth2 _____ Depth3 _____ Depth4 _____ Depth5 _____ Depth6 _____ Area #3_______________________________________________________________ % Wet _______ Stain. Depth1_____ Depth2 _____ Depth3 _____ Depth4 _____ Depth5 _____ Depth6 _____ Area #4________________________________________________________________ % Wet _______ Stain. Depth1_____ Depth2 _____ Depth3 _____ Depth4 _____ Depth5 _____ Depth6 _____ Area #5________________________________________________________________ % Wet _______ Stain. Depth1_____ Depth2 _____ Depth3 _____ Depth4 _____ Depth5 _____ Depth6 _____ SSO Volume by Area Estimation Work Sheet

45 Area #6________________________________________________________________ % Wet _______ Stain. Depth1_____ Depth2 _____ Depth3 _____ Depth4 _____ Depth5 _____ Depth6 _____ Area #1 Square Feet: ______________ x % Wet _______ = ____________ Sq/Ft Ave Depth: ______________ Concrete 0.0026’ Asphalt 0.0013’ Volume: ________________ Cu/Ft
Area #2 Square Feet: ______________ x % Wet _______ = ____________ Sq/Ft Ave Depth: ______________ Concrete 0.0026’ Asphalt 0.0013’ Volume: ________________ Cu/Ft
Area #3 Square Feet: ______________ x % Wet _______ = ____________ Sq/Ft Ave Depth: ______________ Concrete 0.0026’ Asphalt 0.0013’ Volume: ________________ Cu/Ft
Area #4 Square Feet: ______________ x % Wet _______ = ____________ Sq/Ft Ave Depth: ______________ Concrete 0.0026’ Asphalt 0.0013’ Volume: ________________ Cu/Ft
Area #5 Square Feet: ______________ x % Wet _______ = ____________ Sq/Ft Ave Depth: ______________ Concrete 0.0026’ Asphalt 0.0013’ Volume: ________________ Cu/Ft
Area #6 Square Feet: ______________ x % Wet _______ = ____________ Sq/Ft Ave Depth: ______________ Concrete 0.0026’ Asphalt 0.0013’ Volume: ________________ Cu/Ft
Total Volume:
#1 ________, #2 ________, #3 ________, #4 ________, #5 ________, #6 ________ = _________ *cu ft _________ *cu ft x 7.48 gallons = _____________ gallons Spilled.

SSO Volume by Area Estimation Work Sheet

46 CONVERSIONS
** To convert inches into feet: Divide the inches by 12.

Example: 27” / 12 = 2.25’
Or Use Chart A
Example: 1 ¾” = ?
1” (0.08’) + ¾” (0.06’) = 0.14’
** One Cubic Foot = 7.48 gallons of liquid.

Chart A
Conversion:

Inches to Feet
1/8” = 0.01’
1/4” = 0.02’
3/8” = 0.03’
1/2” = 0.04’
5/8” = 0.05’
3/4” = 0.06’
7/8” = 0.07’
1” = 0.08’
2” = 0.17’
3” = 0.25’
4” = 0.33’
5” = 0.42’
6” = 0.50’
7” = 0.58’
8” = 0.67’
9” = 0.75’
10” = 0.83’
11” = 0.92’
12” = 1.00’
SSO Volume by Area Estimation Work Sheet

47 GEOMETRY
For the purposes of this work sheet, the unit of measurement will be in feet for formula examples.

Area is two-dimensional - represented in square feet. (Length x Width) Volume is three-dimensional - represented in cubic feet. (Length x Width x depth) or (Diameter Squared) D2 x 0.785 x depth.

A Note about Depth
Wet Stain on a Concrete Surface - For a stain on concrete, use 0.0026’. This number is 1/32” converted to feet. For a stain on asphalt use 0.0013’ (1/64”). These were determined to be a reasonable depth to use on the respective surfaces through a process of trial and error by SPUD staff. A known amount of water (one gallon) was poured onto both asphalt and concrete surfaces. Once the Area was determined as accurately as possible, different depths were used to determine the volume of the wetted footprint until the formula produced a result that (closely) matched the one gallon spilled. 1/32” was the most consistently accurate depth on concrete and 1/64” for asphalt. This process was repeated several times.

Sewage “Ponding” or Contained – Measure actual depth of standing sewage whenever possible. When depth varies, measure several (representative) points, determine the average and use that number in your formula to determine volume.

Area/Volume Formulas
Area is two dimensional and is represented as Square Feet (Sq. Ft.) Volume is three dimensional and is represented as Cubic Feet (Cu. Ft.) One Cubic Foot = 7.48 gallons
SSO Volume by Area Estimation Work Sheet

48 AREA/VOLUME OF A RECTANGLE OR SQUARE
Formula: Length x Width x Depth = Volume in Cubic Feet

Depth = 1 ¾”
Length (25’) x Width (12’) x Depth (0.14’)
25’ x 12’ x 0.14’ = 42 Cubic Feet.

Now the Volume in Cubic Feet is known.

There are 7.48 Gallons in one Cubic Foot
So, 42 Cubic Feet x 7.48 gallons/cubic feet = 314 Gallons 12’
25’
Chart A
Conversion:

Inches to Feet
1/8” = 0.01’
1/4” = 0.02’
3/8” = 0.03’
1/2” = 0.04’
5/8” = 0.05’
3/4” = 0.06’
7/8” = 0.07’
1” = 0.08’
2” = 0.17’
3” = 0.25’
4” = 0.33’
5” = 0.42’
6” = 0.50’
7” = 0.58’
8” = 0.67’
9” = 0.75’
SSO Volume by Area Estimation Work Sheet

49 AREA/VOLUME OF A RIGHT TRIANGLE
Base x Height x 0.5 x Depth = Volume in Cubic Feet

Depth = 5/8”
Base (45’) x Height (10’) x 0.5 x Depth (.05’) x 7.48 gallons/cubic foot = 84 gallons For Isosceles Triangles (two sides are equal lengths),
Break it down into two Right Triangles and compute area as you would for the Right Triangle above.
10’
45’
Chart A
Conversion:

Inches to Feet
1/8” = 0.01’
1/4” = 0.02’
3/8” = 0.03’
1/2” = 0.04’
5/8” = 0.05’
3/4” = 0.06’
7/8” = 0.07’
1” = 0.08’
2” = 0.17’
3” = 0.25’
4” = 0.33’
5” = 0.42’
SSO Volume by Area Estimation Work Sheet

50 AREA/VOLUME OF A CIRCLE/CYLINDER
Diameter Squared x 0.785 x Depth = Volume in cubic feet.

Diameter = Any straight line segment that passes through the center of a circle.

For our purposes, it is the measurement across the widest part of a circle.

D2 x 0.785 x depth = Volume in cubic feet
Example:
27’ x 27’ x 0.785 x 0.03 = 17.17 cubic feet

17.17 cubic feet x 7.48 gallons/cubic feet = 128 gallons Diameter = 27’
Depth = 3/8”
Chart - A
Conversion:

Inches to Feet
1/8” = 0.01’
1/4” = 0.02’
3/8” = 0.03’
1/2” = 0.04’
5/8” = 0.05’
3/4” = 0.06’
7/8” = 0.07’
1” = 0.08’
2” = 0.17’
3” = 0.25’
4” = 0.33’
D2 x 0.785 x d
SSO Volume by Area Estimation Work Sheet

51 Find the geometric shapes within the shape. If this was the shape of your spill, break it down, as best you can, with the shapes we know.

If the spill depth is of varying depths, take several
measurements at different depths and find the average.

1. Determine the volumes of each shape.

In this example, after the volume of the circle is
determined, multiply it by 55% (+/-) so that the
overlap area won’t be counted twice.

2. Add all the volumes to determine total spill
volume.

SSO Volume by Area Estimation Work Sheet

52 2”

1.5”

1.25”
1”
1" 0.75”

0.5”

0.25”
2” + 1.5” + 1.25” + 1” + 1” + 0.75” + 0.5” + 0.25” = 8.25”

8.25” / 8 measurements = 1.03”
Average Depth = 1.03”
SSO Volume by Area Estimation Work Sheet

53 2” + 1.5” + 1.25” + 3” + 5” + 1.25” = 14.0”

14.0” / 6 measurements = 2.33”
Average Depth = 2.33” (0.194’)
2”

1.5”

1.25”
3”
5”

1.25”
Step 1
If the spill affects a dry,
unimproved area such as a
field or dirt parking lot,
determine the Area of the
wetted ground in the same
manner as you would on a hard
surface. Using a round-point
shovel, dig down into the soil
until you find dry soil. Do this
in several locations within the
wetted area and measure the
depth of the wet soil. Average
the measurement/thickness of
the wet soil and determine the
average depth of the wet soil.

Step 2
Take a Test Sample

NOTE: This can be used in a (Dry) dirt or
grassy area that is not regularly irrigated
like a field or a dirt parking lot.

Wet weather would make this method
ineffective.

EXAMPLE:

If the Area of the spill was determined to be 128 Sq/Ft and the average depth of the wet soil is 2.33 inches:
128 Sq/Ft x 0.194’ = 24.83 Cu/Ft

24.83 Cu/Ft x 7.48 Gals/Cu/Ft = 185.74 gallons
185.74 x 18% = 33 Gallons (water in soil)
Sewer System Management Plan City of Ripon
03/14/2023 25
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APPENDIX E
SSMP Adoption Resolution