Element 8 – System Evaluation, Capacity Assurance, and Capital Improvements City of Pleasanton Sewer System Management Plan, July 2025 32 was calibrated to the flow monitoring data to confirm that it would predict both dry and peak wet weather flows with reasonable accuracy . Potential increases in sewer flows were also estimated and included in the hydraulic analysis based on projected future development and land use changes within the sewer service area.
8.3.2: Design and Performance Criteria
The City selected a 25 -year return period, 24- hour rainfall event 1 as the basis for capacity assessment and design of its sanitary sewer system . This design event is considered to provide reasonable protection from the risk of sewer spills due to infrequent, extreme wet weather events.
The calibrated hydraulic model was used to simulate peak flows that would be expected in the system under both normal dry weather flows and during a design storm event, for both existing and future development conditions . Pipes with flow exceeding a flow depth to pipe diameter ratio of 0.75 under peak dry weather flow were considered deficient and in need of upgrade. Areas with excessive predicted surcharge (i.e., hydraulic gradeline reaching within 3 feet of the ground, indicating a potential risk of a sew er spill) under design storm peak wet weather flow were identified, and required capacity improvements to alleviate those capacity deficiencies were developed . However, if any surcharge was predicted to occur solely due to future development, then the City may require a capacity relief project evaluation before additional development could be connected to the system .
8.3.3: Capacity Assurance
The results of the hydraulic modeling indicated that the City’s sewer system has adequate capacity to convey peak dry weather flows under both existing and future conditions . The results for design storm model simulations indicated two areas of the system that may be considered capacity deficient under existing conditions and two areas that could become capacity deficient in the future due to increased flows from future develop ment. The capacity assessment also determined that all of the modeled system pump stations have sufficient firm capacity (capacity with largest pumping unit out of service) to convey the predicted design storm peak flow without exceeding the maximum allowable surcharge in upstream sewers .
The 2024 Sewer Capacity Evaluation identified four potential capacity improvement projects required to meet the City’s capacity criteria. In several cases, alternatives were also identified, which could be evaluated as part of additional pre -design studies . Required system capacity improvements would be designed in accordance with the City’s Engineering Standards (see Element 5). The recommended projects have been incorporated into the City’s long- term CIP.
At the time of this SSMP Update, the City is evalua ting potential development alternatives for the East Pleasanton Specific Plan area and respective impacts to sewer capacity. Any
1 Based on NOAA Atlas 14, Volume 6, point precipitation frequency estimates and spatial variation across the Pleasanton sewer service area. Reference: https://hdsc.nws.noaa.gov/hdsc/pfds/pfds_map_cont.html?bkmrk=ca.
Element 8 – System Evaluation, Capacity Assurance, and Capital Improvements City of Pleasanton Sewer System Management Plan, July 2025 33 required capacity improvements will be funded and constructed by future develop ers and/or incorporated into the long-term CIP once identified .
8.3.4: Infiltration and Inflow
The hydraulic model was used to evaluate the magnitude of infiltration and inflow (I/I) into the City’s sewer system . Peak I/I flow (for the 25- year design storm) was expressed as a wet weather peaking factor (ratio of peak I/I flow to average dry weather flow) for each flow meter tributary area. The wet weather peaking factors ranged from about 1.5 to 5, with most areas having peaking factors less than 4 . While these values certainly indicate that the system is subject to I/I, the values are lower than man y other San Francisco Bay Area systems . Based on the results of the capacity assessment, the City does not consider I/I to be excessive and warranting a targeted I/I investigation program, but it will continue to monitor flows (at its key pump stations and influent to the DSRSD treatment plant, and through future flow monitoring programs) and re -visit the need for a focused I/I program in the future .
8.4: Impacts of Climate Change
It is generally accepted that storm frequency and intensity will increase in the future as a result of climate change. Already, published rainfall statistics (e.g., NOAA Atlas 14) are likely out-of-date and are currently being updated. NOAA Atlas 15 is anticipated to be released in 2026. At that time, the City will re -evaluate its design storm and make adjustments if warranted in the capacity assessment . The City will continue to monitor conditions in the system during large wet weather events and take future action if observations indicate increased flows or risk of spills due to insufficient capacity during such events.
8.5: Project Funding
The City conducts sewer rate and connection fee studies on a periodic basis to assess the funding needs to support CIP, as well as O&M programs. The next sewer rate and connection fee study is scheduled to be complete as shown in Section 1.2 .
8.6: References
• WDR Attachment – Section 8
• Sewer Capacity Evaluation Report , November 2024
• NOAA Atlas 14
Element 9 – Monitoring, Tracking and Reporting System
City of Pleasanton Sewer System Management Plan, July 2025 34
9.0: Element 9 – Monitoring, Tracking and Reporting
System
The SSMP must include an Adaptive Management section that addresses SSMP implementation effectiveness and the steps for necessary SSMP improvement, including:
a. Maintaining relevant information, including audit findings, to establish and prioritize appropriate Plan activities.
b. Monitoring the implementation and measuring the effectiveness of each element of the Plan.
c. Assessing the success of the preventative operation and maintenance activities. d. Updating Plan procedures and activities, as appropriate, based on monitoring and performance evaluation .
e. Identifying and illustrating spill trends, including spill frequency, locations, and estimated volumes .
9.1: Adaptive Management
The City regularly tracks and updates the performance results of its sanitary sewer program. I n March of each year , the SWRCB requires that the City prepare and submit an Annual Report of its findings in CIWQS. During preparation and prior to certification of the Annual Report, the City will also perform the following related activities:
• Review the SERP for effectiveness and make any changes to ensure proper and timely responses.
• Evaluates the SSMP Audit Report ’s corrective actions to monitor implementation status.
• Report on key performance indicat ors summarized in Table 9 -1 and update performance tracking graphs (see Appendix B).
• Document any required SSMP changes in the SSMP Change Log.
9.2: References
• WDR Attachment D – Section 9
• Appendix B – Spill and Operational Performance Tracking
Element 9 – Monitoring, Tracking and Reporting System
City of Pleasanton Sewer System Management Plan, July 2025 35 Table 9–1: Key Performance Indicator Targets per Calendar Year Key Performance Indicator Target
Regulatory Compliance
• Number of Spills 5
• Spill Reports Completed on Time 100%
• Annual Report Completed on Time 100%
• SSMP Audit Completed on Time 100%
• SSMP Update Completed on Time 100%
Spill Response
Response Time (receipt of call to arrival at site)
• During Business Hours Less than 30 min 95% of the time • After Business Hours Less than 90 min 95% of the time Spill Recovery Volume (average) 75%
Spill Reduction
Number of Repeat Spills 0
Inspections & Maintenance
• Gravity Mains & Manhole Cleaning and Inspections
Completed
7-Year Cycle
(190,000 linear feet/year of piping and
respective manholes)
• Lift Station Inspections Completed 75%
• Force Main Inspections Completed
o Yearly Alignment Walks
o Quarterly Vault/ARVs
100%
75%
• Open vs. Total Work Orders 25%
Element 10 – SSMP Audits
City of Pleasanton Sewer System Management Plan, July 2025 36
10.0: Element 10 – SSMP Audits
The Plan shall include internal audit procedures, appropriate to the size and performance of the system, for the Enrollee to comply with section 5.4 the General Order.
10.1: City SSMP Audit Procedures
The City shall perform internal audits of the SSMP on a triennial (every 3 years) basis per the requirements of the General Order and a certified Audit Report will be completed, certified and uploaded to CIWQS no later than six (6) months following the end of the three- year audit period. If the results of the audit require updates or changes to the sewer program, the content and timeline to complete those change s will be described in the audit correctives action plan , and as the changes are mad e, they will be tracked in the SSMP Change Log.
The milestone for the next SSMP audit is included in Section 1.2.
10.2: References
• WDR Attachment D – Section 10
• SSMP Audit Report: 8/2/21 to 8/2/24
Element 11 – Communication Program
City of Pleasanton Sewer System Management Plan, July 2025 37
11.0: Element 11 – Communication Program
The SSMP must include procedures for the Enrollee to communicate with:
a. The public for spills and discharges resulting in closures of public areas, or that enter a source of drinking water, and t he development, implementation, and update of its Plan, including opportunities for public input to Plan implementation and updates. b. Owners/operators of systems that connect into the Enrollee’s system, including satellite systems, for system operation, maintenance, and capital improvement -related activities.
11.1: Communication Program
The SSMP Update shall be adopted by City Council at a City Council meeting prior to upload to CIWQS. To facilitate the City Council meeting , staff will include a draft version of the SSMP and prepare a staff report and presentation that provides background on regulatory requirements, SSMP purpose and content, and relationship to existing City policies and programs. The draft SSMP and staff report will be available to the public through posting of the City Council meeting agenda on the City’s website . The City Council meeting will be open to the public and include a period for public comment. The final and adopted SSMP will incorporate input from the City Council meeting. Any significant changes to the adopted SSMP in the future will be approved by City Council through a s imilar process.
The SSMP Update report (including referenced SERP) that is adopted and uploaded to CIWQS will be posted on the City’s Utilit ies Division webpage (see link in Section 11.2).
Any changes to the SSMP Update report will be made in the report, documented in the SSMP change log, and then reposted to the City’s Utilities Division webpage. Note that unless the changes are significant, the SSMP Update report will not be resubmitted to CIWQS until the next 6-year due date.
Other communication efforts of the sewer program will include annual check -ins with City Council on KPIs, and public outreach on SSOs and the sewer pipe blockage control plan as described in those programs.
11.2: References
• WDR Attachment D – Section 11
• Utilities Division Website
Sewer System
Management Plan
Appendices
WDID# 2SSO10167
Adopted by City Council – June 17, 2025
Submitted to State Water Resources Control Board – July 31, 2025
In consultation with:
Causey Consulting
Walnut Creek, CA 94598
Table of Contents
City of Pleasanton Sewer System Management Plan, July 2025 i Table of Contents
Appendix A: SSMP City Council Adoption Documents
Appendix B: Spill and Operational Performance Tracking
Appendix C: SSMP Change Log
Appendix A: SSMP City Council Adoption Documents
City of Pleasanton Sewer System Management Plan, July 2025 2 Appendix A: SSMP City Council Adoption Documents
Appendix A: SSMP City Council Adoption Documents
City of Pleasanton Sewer System Management Plan, July 2025 3 Insert City Council adoption documents here.
Appendix B: Spill and Operational Performance Tracking
City of Pleasanton Sewer System Management Plan, July 2025 4 Appendix B: Spill and Operational Performance Tracking
Spill Performance Results
5 5
3 2
1 4 4
5 4
3 4
7 3 3 3
1 2
0 1
2 3
4 5
6 7
8 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 Annual Spill Events
0 1
2 3
4 5
6 7
8 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 Annual Spills by Spill Category
Cat 1 Cat 2 Cat 3 Cat 4
Appendix B: Spill and Operational Performance Tracking
City of Pleasanton Sewer System Management Plan, July 2025 5
0 1
2 3
4 5
6 7
8 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 Annual Spills by Cause
Roots Grease Debris other
0 2000
4000
6000
8000
10000
12000
2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 Comparison of Annual Spill Volumes, Recovered and to Waters Spill Volume Recovered Vol Volume to waters
Appendix B: Spill and Operational Performance Tracking
City of Pleasanton Sewer System Management Plan, July 2025 6
58 63
29 28
100
35 17
8 37
98 31
17 57
87 23
54 98
0 34
51 0 0
63 80
91 62
87 68
82 42
0 92
45 1
0 20
40 60
80 100
120
2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 Pwecentage of Annua; Spill Volume
Comparison of Receovered versus To Waters
Percent Recovered Percent to Waters
2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 Pleasanton 1.92 1.92 1.15 0.77 0.38 1.54 1.54 1.92 1.54 1.15 1.54 2.69 1.15 1.15 0.77 0.38 0.77 State 6.16 5.81 5.33 5.06 4.97 4.86 5.08 4.41 4.05 3.62 3.22 3.24 4.02 3.59 1.67 3.29 1.37 RWQCB2 10.71 9.53 8.36 7.62 6.79 5.77 6.5 4.86 5.21 4.88 3.84 4.23 3.18 4.66 1.87 3.06 1.93 0 2
4 6
8 10
12 Annual Comparison of SSO Rate/100 Miles
Appendix B: Spill and Operational Performance Tracking
City of Pleasanton Sewer System Management Plan, July 2025 7
Operational Performance Results
2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 Pleasanton 1.92 1.92 1.15 0.77 0.38 1.54 1.54 1.92 1.54 1.15 1.54 2.69 1.15 1.15 0.77 0.38 0.77 State 6.16 5.81 5.33 5.06 4.97 4.86 5.08 4.41 4.05 3.62 3.22 3.24 4.02 3.59 1.67 3.29 1.37 RWQCB2 10.71 9.53 8.36 7.62 6.79 5.77 6.5 4.86 5.21 4.88 3.84 4.23 3.18 4.66 1.87 3.06 1.93 0 2
4 6
8 10
12 Annual Comparison of SSO Rate/100 Miles
-
50,000
100,000
150,000
200,000
250,000
2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 Calendar Year Line Cleaning, Linear Feet
Appendix B: Spill and Operational Performance Tracking
City of Pleasanton Sewer System Management Plan, July 2025 8
6%
2%
6%
4%
2%
1%
7%
5%
2%
2%
13%
16%
8%
16%
3%
0%
2%
4%
6%
8%
10%
12%
14%
16%
18%
2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 Calendar Year Line Cleaning, Percent of System
-
50,000
100,000
150,000
200,000
250,000
300,000
350,000
400,000
450,000
500,000
2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 Historical Cleanning Performance, Linear Feet
Typical 5 year frequency 268,646 LF/year
Appendix B: Spill and Operational Performance Tracking
City of Pleasanton Sewer System Management Plan, July 2025 9
-
50,000
100,000
150,000
200,000
250,000
300,000
350,000
400,000
450,000
2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 Calendar Year CCTV, Linear Feet
5% 4%
2%
5%
2%
1%
2% 3%
0% 0%
7%
11%
8%
30%
2%
0%
5%
10%
15%
20%
25%
30%
35%
2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 Calendar Year CCTV, Percent of the System
Appendix B: Spill and Operational Performance Tracking
City of Pleasanton Sewer System Management Plan, July 2025 10
2011 2012 2013 2014 2015 2016 2017 2018 2019 2020
Series1 63,693 49,483 31,879 63,217 31,589 6,829 33,187 35,956 808 3,531 -
50,000
100,000
150,000
200,000
250,000
300,000
Calendar Year
Historical CCTV Performance, Linear Feet/Year
Appendix C: SSMP Change Log
City of Pleasanton Sewer System Management Plan, July 2025 11 Appendix C: SSMP Change Log
SSMP CHANGE LOG
Date SSMP
Element # Description of Change / Revision Made
Person
Authorizing
Change
RESOLUTION NO. 2025-XX
A RESOLUTION OF THE CITY COUNCIL OF THE CITY OF PLEASANTON TO APPROVE THE 2025 SEWER SYSTEM MANAGEMENT PLAN
WHEREAS, the City of Pleasanton owns and operates a sewer collection system; and
WHEREAS, the State Water Resources Control Board on December 6, 2022, adopted the Statewide Waste Discharge Requirements General Order WQ 2022- 0103-DWQ (Order), which became effective June 5, 2023 and established updated regulatory requirements for sewer collections systems within California; and
WHEREAS, the Order requires the preparation of a Sewer System Management Plan (SSMP) by all agencies enrolled under the Order;
WHEREAS, the Order requires that the SSMP be approved by the governing body of the agency at a public meeting.
NOW, THEREFORE , THE CITY COUNCIL OF THE CITY OF PLEASANTON DOES RESOLVE, DECLARE, DETERMINE AND ORDER THE FOLLOWING:
SECTION 1. The City of Pleasanton approves the 2025 SSMP.
SECTION 2. The City’s Legally Responsible Official , as designated in the SSMP , is authorized to submit the SSMP to the State Water Resources Control Board.
PASSED, APPROVED AND ADOPTED by the City Council of the City of Pleasanton at a regular meeting held on June 17, 2025
I, Jocelyn Kwong, City Clerk of the City of Pleasanton, California, certify that the foregoing resolution was adopted by the City Council at a regular meeting held on the 17 th day of June 2025,
by the following vote:
Ayes:
Noes:
Absent:
Abstain:
_____________________________
Jocelyn Kwong, City Clerk
APPROVED AS TO FORM:
_______________________________
Daniel G. Sodergren, City Attorney
6/3/2025
1 2025 Sewer System Management PlanCity Council Meeting - June 17, 2025 Outline•Overview of sewer system•Overview of SWRCB regulations for sewer systems•2025 SSMP summary and major recommendations•Next steps•Questions and discussions•Council Action1 2
6/3/2025
2 Overview of sewer system
Sewer System Description•21,000 service connections•Average dry weather flow – 6 mgd•253 miles of gravity pipe•8 siphons•11 lift stations•5 miles of force main•Not responsible for customer laterals 3 4
6/3/2025
3 Agency Agreements•DSRSD – Sewage Treatment (majority of service area)•City of Livermore – Sewage Treatment (Ruby Hill only)•Alameda County – Transport of Castlewood sewage to DSRSD•LAVWMA – Treated Water Disposal Overview of SWRCB regulations5
6
6/3/2025
4 2022 WDR Goals•Establish consistent / effective spill prevention•Reduce number of spills•Reduce volume of spills to waters•Prevent nuisances under Water Code 13263•Establish spill recordkeeping requirements•Single, reliable reporting system (CIWQS)•Assure proactive operations and maintenance•Assure system capacity and R&R planning•Assure proper funding 2022 WDR Requirements•Prepare and implement a Sewer System Management Plan (SSMP)•Update every six years •Requires governing body approval•Submit to SWRCB and post to agency website•Next City SSMP update - due July 31, 2025•Perform internal SSMP Audits•Audits every three years•Submit to SWRCB•Last City Audit Period – Aug 2021 to Aug 2024 (submitted Jan 31, 2025)•Annual reports (performance) to SWRCB•Spill reporting to SWRCB 7 8
6/3/2025
5 Compliance Enforcement•By SWRCB and/or SF Bay RWQCB•Can include financial penalties for:•Number of spill events•Large Category 1 spills to waters•Failure to report to SWRCB on-time•Lack of sewer programs (economic value)•Improper resources to implement program•Unreasonable implement schedule•Why worry about compliance?•Santa Cruz ~ $275,000•Costa Mesa ~ $850,000•Victorville ~ $6.3 million•EBMUD / 7 Satellites - $1.5 billion•Riverwatch (100+) - $35,000 - $50,000 each 2025 SSMPSummary and Major Recommendations9
10
6/3/2025
6 Basis for preparing 2025 SSMP8/21 to 8/24 Internal Audit Compliance review of new WDR
SSMP Required Elements1.Goals and Introduction2.Organization3.Legal Authority4.Operations & Maintenance Program5.Design and Performance Provisions6.Spill Emergency Response Plan7.Sewer Pipe Blockage Control Plan8.System Evaluation, Capacity Assurance, and Capital Improvements9.Monitoring, Tracking, and Reporting System10.SSMP Audits11.Communication ProgramAppendicesA.Council Adoption DocumentsB.Performance TrackingC.SSMP Change Log 11 12
6/3/2025
7 Element 2 Organization – Legally Responsible Official (LRO) •LRO must have the authority within the City to:•Ensure compliance with provisions of WDR•Make managerial decisions regarding operation of sewer system•Make recommendations on major capital improvements•Direct individuals that have necessary qualifications / degrees / certifications •LRO certification requirements for reporting to SWRCB:•Certify under penalty of law•Information is prepared under direction or supervision•Penalties for submitting false information include possibility of fine and imprisonment for knowing violations•City’s Designated LROs•Primary – Public Works Director•Secondary – Utilities Division Manager (scope limited to certification of spill reports) Element 4 – O&M Program •Inspection based O&M program•Major Audit Finding:•O&M program lacks sufficient resources to properly implement•SSMP Recommended Actions: •Perform resource evaluation including internal staffing, contract service agreements/budgets, & vehicle/equipment•Results to inform upcoming sewer rate study 13 14
6/3/2025
8 Element 6 – Spill Emergency Response Program•SERP Updated to new WDR requirements in June 2023•SERP includes:•Narrative to support prompt, orderly, and effective responses to spills from City sewers, reduce spill volumes, and collect information to reduce risk of future spills•Workbook to guide staff in responding to, cleaning up, and documenting spills and backups into private buildings.•Water quality monitoring procedures when applicable.
Element 7 – Sewer Pipe Blockage Control Program•Major Audit Finding:•Program lacks sufficient resources to properly implement •Emphasis in facility inspections & enforcement•SSMP Recommended Actions: •Hire contract services to:•Assist in updating program for compliance with new WDR•Provide inspection services on interim basis•Include program in Resources Evaluation to identify long-term needs and inform sewer rate study •Program to control pipe blockage from fats, oils, grease, rags, and debris.•Program must include:•Public education / outreach•Requirements to install FOG removal devices•Identification, inspection, and enforcement of FOG producing facilities15 16
6/3/2025
9 Element 8 – System Evaluation, Capacity Assurance & Capital Improvements•Completed work:•2024 Sewer Capacity Evaluation (new hydraulic model calibrated with flow monitoring data)•Condition assessments of gravity mains (based on CCTV data from 30% of system)•Condition assessment of lift stations•Upcoming Long-term Sewer CIP:•Prioritized projects w/ cost estimates over 20-year span•Inform the upcoming sewer rate study Element 9 Monitoring, Tracking, and Reporting SystemNewly Established KPIs 17 18
6/3/2025
10 Element 9 - Monitoring, Tracking, and Reporting System Annual Performance Report to SWRCB
Recommendation and Next Steps19
20
6/3/2025
11 Next Steps•July 31, 2025 – Submit SSMP to SWRCB•October 2025 - Resource review to properly implement SSMP•October 2025 - Long-term Sewer CIP•July 2026 – Effective date for updated Sewer Rate and Connection FeesAdopt a resolution approving the city’s 2025 Sewer System Management PlanRecommendation Questions, Discussion and Council Action21
22