SECTION A | INCIDENT IDENTIFICATION
Operator Arrival
Date/Time (CIWQS Q4) Date/Time Cal OES
Notified (CIWQS Q6)
Date Reported Time Reported
Date Spill Started Time Spill Started
Date Spill Ended Time Spill Ended
Spill Duration (hrs) CIWQS Event ID (after entry)
Reported By (Name / Phone)
Location / Address of Spill
APN / Nearest Cross Street
GPS Spill Origin (Latitude,
Longitude)
Crew Responding (Names)
SECTION B | SPILL CATEGORY DETERMINATION (Circle/Check One)
Cat. Description Reporting Deadline / Notification
1 Any volume reaching surface water
or a drainage conveyance system
that discharges to surface water
Draft within 3 business days; certify within 15 calendar days. Notify CalOES (800-852- 7550) within 2 hours if ≥1,000 gal.
Notify RWQCB & local health agency immediately.
2 ≥ 1,000 gallons; no discharge to
surface water
Draft within 3 business days; certify within 15 calendar days.
Notify CalOES within 2 hours if ≥1,000 gal.
3 ≥ 50 and < 1,000 gallons; no
discharge to surface water
Certify within 30 calendar days of spill end.
4 < 50 gallons; no discharge to surface
water
Report in monthly No-Spill / Cat. 4 certification.
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Sanitary Sewer Spill (Spill) Field Report WDID: 2SSO10141 | Form Rev. 5/26/26
City of Hercules | Sewer System Management Plan Spill Field Data Form
SECTION C | VOLUME ESTIMATION
Estimated Total Volume (gallons)
Volume Recovered (gallons)
Volume Discharged to Environment
(gallons)
Estimation Method Used ☐ Visual ☐ Area x Depth ☐ Duration x Flow Rate ☐ Contractor Estimate ☐ Other: ____________
Volume Estimation Notes /
Calculations
SECTION D | SPILL SOURCE AND CAUSE
Spill Appearance Point ☐ Manhole ☐ Cleanout ☐ Private Lateral ☐ Force Main ☐ Other: ___________
Cause of Spill
☐ Root Intrusion ☐ Grease Blockage ☐ Debris/Rags ☐ Structural Defect ☐ Pump Station Failure ☐ Vandalism ☐ Flow Surcharge (I/I) ☐ Other: ___________
System Asset ☐ Gravity Main ☐ Force Main ☐ Lift Station ☐ Private Lateral □ Other Manhole or Asset ID
Pipe Material / Diameter
Estimated Year Installed
Was the spill associated with a storm
event? Yes ☐ No ☐ Unknown ☐
SECTION E | SPILL DESTINATION AND ENVIRONMENTAL IMPACT
Spill Destination(s)
☐ Remained on Pavement ☐ Storm Drain Inlet ☐ Drainage Channel ☐ Soil/Landscaping ☐ Contained (vacuum truck)
☐ Receiving Water (name): __________________________
Did spill reach surface water (creek,
bay, slough, storm drain)? Yes ☐ No ☐ Unknown ☐ Is spill area hydrologically connected
to San Pablo Bay / receiving water? Yes ☐ No ☐ Unknown ☐ Was spill within 1,000 ft of a potable
water intake? Yes ☐ No ☐ Unknown ☐
Was there public contact with
sewage? Yes ☐ No ☐ Unknown ☐
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Sanitary Sewer Spill (Spill) Field Report WDID: 2SSO10141 | Form Rev. 5/26/26
City of Hercules | Sewer System Management Plan Spill Field Data Form
Name of Receiving Water (if
applicable)
Type of Receiving Water (if
applicable)
☐ Creek/Stream ☐ River ☐ Bay/Estuary ☐ Ocean/Coastal ☐ Lake/Reservoir ☐ Wetland ☐ Groundwater
☐ Other: ________
Describe Path to Drainage/Receiving
Water
SECTION F | RESPONSE ACTIONS TAKEN
Containment Method(s) ☐ Sandbags/Berms ☐ Vacuum Truck ☐ Storm Drain Blocked ☐ Plugged MH ☐ Other: _______
Corrective Action Taken (Cleared
Blockage, Repair, etc.)
☐ Hydroflushed ☐ Rodded ☐ Emergency Repair ☐ Bypass Pumping ☐ Other: _______
Was the spill area cleaned and
disinfected? Yes ☐ No ☐ Unknown ☐
Were warning signs or door
hangers posted at the spill area? Yes ☐ No ☐ Unknown ☐ Were warning signs posted
warning the public? Yes ☐ No ☐ Unknown ☐
Vacuum Truck Volume Recovered
(gal)
Describe Cleanup and Restoration
Actions
SECTION G | REGULATORY NOTIFICATIONS
Agency / Contact Required When Notified? (Y/N) Date/Time | Control No.
Cal OES (800-852-7550) Cat. 1 or 2 ≥1,000 gal within
2 hrs
SF Bay RWQCB – Region 2 Cat. 1 immediately; Cat. 2
within 24 hrs
Contra Costa Environmental Health Cat. 1; public health threat East Bay Municipal Utility District (EBMUD) – if
near intake
Spill within 1,000 ft of intake
City of Hercules Public Works Director All Cat. 1 & 2; Cat. 3 per SSMP
CIWQS – Draft Spill Report entered by: All Cat. 1, 2, 3 236
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Sanitary Sewer Spill (Spill) Field Report WDID: 2SSO10141 | Form Rev. 5/26/26
City of Hercules | Sewer System Management Plan Spill Field Data Form
CIWQS – Certified by LRO: All Cat. 1, 2, 3
SECTION H | WATER QUALITY MONITORING (Category 1 Only)
Was water quality monitoring
required (Cat. 1 spill)? Yes ☐ No ☐ Unknown ☐ Were samples collected? Yes ☐ No ☐ Unknown ☐ Sampling Location(s)
Sample Date/Time
Chain of Custody No.
Monitoring Notes / Results Summary
SECTION I | PRELIMINARY FAILURE ANALYSIS
Root Cause Assessment
☐ Inadequate Maintenance Frequency ☐ Aging Infrastructure ☐ Third-Party Damage ☐ Operator Error ☐ I/I Surcharge ☐ Power Failure ☐ Unknown at time of response ☐ Other: ___________
Was this location previously
cleaned/inspected in last 12 months? Yes ☐ No ☐ Unknown ☐ Is a follow-up CCTV inspection
required? Yes ☐ No ☐ Unknown ☐
Is a corrective maintenance work
order being issued? Yes ☐ No ☐ Unknown ☐
Corrective / Preventive Actions
Planned (include Work Order # if
issued)
SECTION J | SITE SKETCH AND PHOTO LOG
Photos taken? Yes ☐ No ☐ Unknown ☐
No. of Photos Taken
Photo File Location / Reference
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Sanitary Sewer Spill (Spill) Field Report WDID: 2SSO10141 | Form Rev. 5/26/26
City of Hercules | Sewer System Management Plan Spill Field Data Form
Site Sketch (attach or draw below)
SECTION K | SEWER BACKUP INTO PRIVATE PROPERTY (Complete If Applicable)
Did sewage back up into private
property (home or business)? Yes ☐ No ☐ Unknown ☐ Property Owner / Occupant Name
Property Address
Property Owner Phone
Was cleaning service
offered/provided? Yes ☐ No ☐ Unknown ☐
Was claim form provided to property
owner? Yes ☐ No ☐ Unknown ☐
Was door hanger left? Yes ☐ No ☐ Unknown ☐
Backup Notes
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CITY OF HERCULES
Sanitary Sewer Spill (Spill) Field Report WDID: 2SSO10141 | Form Rev. 5/26/26
City of Hercules | Sewer System Management Plan Spill Field Data Form
SECTION L | CERTIFICATION AND SIGNATURES
I certify under penalty of law that this document and all attachments were prepared under my direction or supervision in accordance with a system designed to assure that qualified personnel properly gathered and evaluated the information submitted. Based on my inquiry of the person or persons who manage the system, or those persons directly responsible for gathering the information, the information submitted is, to the best of my knowledge and belief, true, accurate, and complete.
First Responder (Print Name)
First Responder Signature / Date
Crew Supervisor (Print Name)
Crew Supervisor Signature / Date
Legally Responsible Official (LRO)
– Print Name
LRO Signature / Date (for CIWQS
certification)
SECTION M | POST-RESPONSE CHECKLIST
# Task Done
1 Spill area contained and cleaned; disinfectant applied ☐ 2 Spill cause corrected (blockage cleared, pump restored, etc.) ☐ 3 All required agencies notified (see Section G) ☐
4 Cal OES notified (Cat. or Cat. 2 with volume ≥1,000 gal) and control number recorded ☐ 5 Signs posted warning the public of the spill incident ☐ 6 Draft Spill report entered in CIWQS within 3 business days (Cat. 1, 2, 3) ☐ 7 Certified Spill report submitted in CIWQS by LRO within required deadline ☐ 8 Water quality sampling completed if Cat. 1 (see Section H) ☐ 9 Photos and site sketch filed in spill incident record ☐ 10 Private property claim form provided if applicable (see Section K) ☐ 11 Follow-up CCTV or corrective maintenance work order issued if required ☐ 12 Post-spill debrief and failure analysis scheduled (Cat. 1, 2, or recurring) ☐ 13 Spill incident file created and filed at Public Works ☐
Retain completed form in City of Hercules SSMP Spill Incident File. Retain records for a minimum of 5 years per WQ 2022-0103-DWQ Section 5.13. 239
Contra Costa Clean Water Program
Public Outreach Materials
Appendix F
240
241
242
243
244
245
246
247
248
249
250
City of Hercules 2024 SSMP Audit Report
Appendix G
251
P
REPARED BY
Sew
er System Management Plan
2024 SSMP Audit Report
P
REPARED FOR
Cit
y of Hercules
AU
DIT REPORT | AUGUST 2024
252
N-C-68
2 CITY OF HERCULES-40-23-04-WP-2024
1 Cit
y of Hercules
August 2024
Sewer
System Management Plan
2024 SSMP Audit Report
IN
TRODUCTION
T
his audit was performed in August 2024 on the City of Hercules’ (City) January 2019 Sewer System Management Plan (SSMP) – WDID 2SSO10141 – as required by the State Water Board Order No. 2022- 0103- DWQ, Statewide Waste Discharge Requirements for Sanitary Sewer Systems (WDR, General Order).
According to the State Water Board Sewer System Management and Program Audit Due Dates Look Up website1,
the City’s next SSMP update is due August 2025. The City’s SSMP was last updated in 2019.
The City updated the Spill and Emergency Response Plan (SERP, formerly Overflow Emergency Response Plan) portion of the SSMP in June 2023 as required by the State Board.
The City’s SSMP was last audited in June 2023 based on the 2006 General Order (retroactive audit, covering the 4-year period from January 2019 to January 2023). Therefore, this audit covers the period from January 2023 to August 2024. This August 2024 audit will align the City with the State Water Board’s due dates.
The intent of the audit is to evaluate the SSMP’s compliance with WDR Order No. 2022-0103-DWQ and the effectiveness of the SSMP individual elements.
A
UDIT PROCESS
The 20
24 audit methods included a Gap Analysis and an Effectiveness Evaluation using the City’s performance indicators. The audit findings and recommendations will be used to update the City’s SSMP during the next required update (due August 2025), or specific elements that are required to be updated before August 2025.
GAP
ANALYSIS
The
Gap Analysis evaluated whether the SSMP is compliant with the WDR. The Gap Analysis uses industry reference materials, benchmarking data, and State Board regulatory enforcement procedures to identify areas for improvement in the SSMP itself, or the City’s management or maintenance procedures.
The Gap Analysis results are presented in Table 1 below. An “X” indicates that a gap exists as described in the column. An element with a “check mark” indicates the element is found to be in compliance with the WDR. Comments indicate action items recommended to comply with the WDR or to improve the SSMP as a management tool. The column at the far right indicates how the gap will be addressed in the forthcoming 2025 SSMP update. At the end of each Element section, a summary of the effectiveness of the SSMP Element is provided along with suggestions on improvement if applicable. Effectiveness is further evaluated the City’s performance indicators, as summarized in the last section of this report.
1 htt
ps://www.waterboards.ca.gov/water_issues/programs/sso/lookup/ 253
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T
able 1. SSMP Gap Analysis
Requ
irement W
DR Compliance Gap Com
ments/Recommendations Cha
nges to SSMP Required
GE
NERAL ITEMS
1. SSMP
Document Name ✔ N
o Gap Identified -
2. Sy
stem Overview section X Revie
w definitions and abbreviations, include Category 4 spills Update spill references to include Category 4 spills.
E
LEMENT 1 – GOAL AND INTRODUCTION
Are t
he goals stated in the SSMP still appropriate, i.e.: properly manage, operate, and maintain all parts of sanitary sewer system. The Plan must include a narrative introduction s
ection that discusses the following items:
1 .1 Regulatory context – Provide a general
description of the local sewer system
management program and discuss Plan
implementation and updates. X
Pro
vide a brief description of schedule for goals mentioned (i.e., maintenance schedule, % cleaned/inspected yearly, # of manholes, etc.) Recom
mend reviewing goals to make sure they reflect current City practices and initiatives.
Upd
ate narrative to include Category 4 spill description added in the new General Order
Provide a general schedule for
goals mentioned and include
Category 4 spills in spill
description section.
1 .2 Audits - SSMP Plan audit and update
schedule. Including milestones for
incorporation of activities to address
and prevent spills
X
In
clude an SSMP audit, and SSMP update schedule. Deadlines can be found on the waterboard website.
h
ttps://www.waterboards.ca.gov/water_issues/programs/sso/lookup/ I
nclude a graphic or table with the
a
udit and update deadlines
provided by the Board.
1 .3 Sewer System Asset Overview –
description of assets and service area ✔ N
o Gap Identified
-
E
ffectiveness of Element 1 Element is effective if updates are made. See Recommendations.
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Tab
le 1. SSMP Gap Analysis
Require
ment WD
R Compliance Gap Co
mments/Recommendations Chan
ges to SSMP Required
ELE
MENT 2 – ORGANIZATION
The Plan
must identify organizational staffing responsible and integral for implementing the local Sewer System Management Plan through an organization chart or similar narr
ative documentation that includes:
2. 1
Name of Legally Responsible Official
(LRO) in SSMP. ✔
No
Gap Identified. In the new General Order some sections have shifted, recommend reviewing this section to align with the general order numbering, though not required.
-
2. 2
City Organization Chart that is
current. Including titles, numbers,
and email addresses.
X
Several ro
le titles and staff changes have occurred since 2019.
Role responsibilities and processes are correct but should be updated.
Update organization chart, role titles
and staff name.
2. 3
Role and responsibility descriptions
accurately portraying staff
responsibilities.
X
2. 4
Identify staff responsible for
implementing specific measures in
the SSMP.
✔
No
Gap Identified
-
2. 5
Identify the Chain of
Communication for reporting SSOs,
accurately and up to date.
✔
Effe
ctiveness of Element 2 Element is effective with the update of role titles, names, and org chart. See Recommendations. 255
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able 1. SSMP Gap Analysis
Requ
irement W
DR Compliance Gap C
omments/Recommendations Cha
nges to SSMP Required
E
LEMENT 3 – LEGAL AUTHORITY
The P
lan must include copies or an electronic link to the Enrollee’s current sewer system use ordinances, service agreements and/or other legally binding procedures to d
emonstrate the Enrollee possesses the necessary legal authority to:
3 .1
Prevent illicit discharges from I&I,
unauthorized stormwater,
chemical, and debris.
✔
N
o Gap Identified. Link is still functional. -
3 .2
Collaborate with storm sewer
agencies to coordinate emergency
spill response, prevent
unintentional cross connections.
✔
3 .3
Require that sewers and
connections be properly designed
and constructed?
✔
3 .4
Ensure access for maintenance,
inspection, or repairs for portions of
the lateral owned or maintained by
City?
✔
3 .5 Enforce any violation of its sewer
ordinances.
✔
3 .6
(If applicable) Obtain easement
accessibility agreements for locations
requiring sewer system operations
and maintenance.
✔
Ef
fectiveness of Element 3 Element is effective.
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able 1. SSMP Gap Analysis
Requ
irement W
DR Compliance Gap C
omments/Recommendations Cha
nges to SSMP Required
E
LEMENT 4 – OPERATIONS AND MAINTENANCE PROGRAM
The P
lan must include the items listed below that are appropriate and applicable to the Enrollee’s system. 4 .1
Mapping - Are the City’s sanitary
sewer system maps complete,
current, and sufficiently detailed
(including gravity lines, manholes,
pumping facilities, pressure pipes,
valves, and applicable storm
facilities within sewer service
boundaries)
Include procedures for maintaining
and providing the Regional Water
Board with access.
X
The Cit
y maintains GIS maps of the wastewater collection system but would benefit from establishing a formal map update process.
Ma
ps should be updated if any changes since 2019.
In
clude procedures for providing the Board with access to the map
s (e.g., posted on City website, digital or hard copies that can b
e delivered if requested).
Include information on implementation
of formal map update procedures;
procedures to provide the Water Board
access to the maps.
4 .2
Preventative Maintenance -
Description of scheduling system,
and data collection system for
preventive O&M activities
conducted by staff and contractors.
X
Forma
l scheduling system not currently in place. Historical
maintenance activities are not documented in SSMP.
Recommend including historical maintenance activities and establish a system for scheduling maintenance.
Recom
mend including narrative of maintenance performed. For
example: Flushing of the Entire system and CCTV was completed in 2018. Quarterly inspections and hotspot maintenance are also performed.
Recom
mend including updates to I&I program if there are any.
Include narrative on formal
maintenance scheduling or recent large
maintenance items performed. Or
alternatively link to an external
appendix, or other database where
these are stored.
4 .3
Training - In house and external
training provided on regular basis
for O&M staff.
X Recom
mend holding trainings on a regular basis and logging
training events for O&M staff. -
4 .4
Major Equipment - Equipment
Inventory of sewer system
equipment, including identification
of critical replacement and spare
parts.
✔ N
o Gap Identified. Update list if needed. -
Ef
fectiveness of Element 4 Element needs to be expanded and updated. See recommendations. 257
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able 1. SSMP Gap Analysis
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DR Compliance Gap C
omments/Recommendations Cha
nges to SSMP Required
E
LEMENT 5 – DESIGN AND PERFORMANCE PROVISIONS
The P
lan must include the following items as appropriate and applicable to the Enrollee’s system:
5 .1
Does the SSMP contain current
design and construction standards
for the installation of new sanitary
sewer systems, pump stations and
other appurtenances and for the
rehabilitation and repair of existing
sanitary sewer systems?
✔
N
o Gap Identified. Links are still functioning. -
5 .2
Does the SSMP document current
procedures and standards for
inspecting and testing the
installation of new sewers, pumps,
and other appurtenances and for
rehabilitation and repair projects?
✔
Ef
fectiveness of Element 5 Element is effective.
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able 1. SSMP Gap Analysis
Requ
irement W
DR Compliance Gap C
omments/Recommendations Cha
nges to SSMP Required
E
LEMENT 6 – SPILL EMERGENCY RESPONSE PLAN (SERP)
The Sp
ill Emergency Response Plan must include procedures to:
6 .1 N
otify primary responders, appropriate local officials, and regulatory agencies of a
spill in a timely manner. ✔
N
o Gap Identified. Recommend
reviewing efficacy with field staff -
6 .2 Notify other affected entities (i.e. health agencies, water suppliers, etc.) of spills that affect public health, or waters of the State. ✔
6 .3 Comply with notification, monitoring, and reporting requirements. ✔ 6 .4 Ensure appropriate staff and contractors implement SERP are appropriately trained. ✔ 6 .5 Address emergency system operations, traffic control, and other response activities. ✔ 6 .6 Contain spill and prevent/minimize discharge to waters of the state or drainage conveyance systems. ✔
6 .7 Min
imize public health impacts and adverse impacts on beneficial uses of waters of t
he State. ✔
6 .8 Remove sewage from the drainage conveyance system. ✔ 6 .9 Clean spill area and drainage conveyance system in a manner that does not inadvertently impact beneficial uses in receiving waters. ✔
6 .10 Implement technologies, practices, equipment, and interagency coordination to expedite containment and recovery.
✔
6 .11 Implement pre-p
lanned coordination and collaboration with storm drain agencies, and o
ther utility agencies and departments prior, during, and after a spill event. ✔ 6 .12 Conduct post-spill assessments of spill response activities ✔ 6 .13 Document and report spill events as required ✔
6 .14 Annually review and assess effectiveness of the SERP and update as needed ✔ Ef
fectiveness of Element 6 Element is effective. However, copy of SSMP linked on website should be updated to include 2023 SERP updates.
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able 1. SSMP Gap Analysis
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DR Compliance Gap C
omments/Recommendations Cha
nges to SSMP Required
E
LEMENT 7 – SEWER PIPE BLOCKAGE CONTROL PROGRAM
SSMP
must include procedures for the evaluation of the Enrollee’s service area to determine whether a sewer pipe blockage control program is needed to control fats, oils, greas
e, rags, and debris. If the Enrollee determines that a program is not needed, the Enrollee shall provide justification in its Plan for why a program is not needed. The p
rocedures must include, at minimum:
7 .1
Implementation plan and schedule
for public education and outreach
program.
✔
N
o Gap Identified -
7 .2 A plan and schedule for disposal of
pipe-blocking substances.
✔
7 .3
Legal authority to prohibit
discharges, and identify measures
to prevent spills and blockages.
✔
7 .4
Grease removal device
requ
irements including; installation,
d
esign standards, maintenance,
BMP, recordkeeping and reporting
requirements.
✔
7 .5
Authority to inspect grease
producing facilities, enforcement
authorities, and whether sufficient
staff exist to inspect and enforce
FOG ordinance.
✔
7 .6
Identification of sanitary sewer
s
ystem sections subject to FOG, and
est
ablishment of cleaning schedule.
X Upd
ate list of FOG Hot Spots. Update list of FOG hot spots to reflect current locations.
7 .7
Implementation of source control
measures for all sources of FOG
reach
ing the sanitary sewer system.
✔ N
o Gap Identified -
Ef
fectiveness of Element 7 Element is effective if updates are made. See Recommendations. 260
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omments/Recommendations Cha
nges to SSMP Required
E
LEMENT 8 – SYSTEM EVALUATION, CAPACITY ASSURANCE PLAN AND CAPITAL IMPROVEMENTS SSMP
must include procedures and activities for: Routine evaluation and assessment of system conditions, capacity assessment and design criteria, prioritization of corrective act
ions, and a capital improvement plan:
8 .1
Routine evaluation and
assessment of system conditions.
Identify hydraulic deficiencies.
X
2008 M
aster Plan documented CIP; no updates since due to
resource constraints.
Wh
en next Master Plan is developed, recommend prioritizing a hydraulic eva
luation considering increased storm frequency and
u
se to assist with CIP prioritization.
Pro
vide update on CIP (since 2008 Master
Pla
n) 8
..2
Capacity assessment and design
criteria. Consider storm frequency
increases due to climate change.
X
8 .3
Capital improvement plan
including prioritization of
corrective actions.
X
Ef
fectiveness of Element 8 Element is effective if updates are made. See Recommendations.
E
LEMENT 9 – MONITORING, MEASUREMENT, AND PROGRAM MODIFICATIONS SSMP
should include an adaptive management section to address plan-implementation effectiveness and the steps for necessary plan improvement including the following:
9 .1
SSMP should accurately portray
the methods of maintaining and
tracking relevant information that
can be used to establish and
prioritize appropriate SSMP
activities.
✔ N
o Gap Identified
Update data in SSO tables (to 2024) –
see Effectiveness section of this report.
9 .2
Sufficiently evaluate the
effectiveness of SSMP elements
and PM program based on
relevant information.
✔ N
o Gap Identified
9 .3
Identify and illustrate SSO trends
including frequency, location, and
volume.
X Dat
a in tables and figures is out of date, recommend updating regularly on a yearly, or semi-yearly basis as possible.
Ef
fectiveness of Element 9 Element is effective if updates are made. See Recommendations.
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le 1. SSMP Gap Analysis
Require
ment WD
R Compliance Gap Co
mments/Recommendations Chan
ges to SSMP Required
ELE
MENT 10 – SSMP PROGRAM AUDITS
SSMP s
hould include internal audit procedures, appropriate to the size and performance of the system and answer the following:
10 .1
Have SSMP Audits been
completed? Audits must occur
within six months after the end of
the required 3-year audit period.
Audit reports must be kept on file.
✔
Completio
n of this audit will satisfy the 3-year audit
requirement period ending August 2024. Audit will be attached to the SSMP in the appendices.
Attach this audit to the next SSMP
update document.
10 .2
Has
a schedule been established to
add
ress any compliance issues
found in the previous Audit(s).
✔ No
gap identified. -
Effe
ctiveness of Element 10 Element is effective.
ELE
MENT 11 – COMMUNICATION PROGRAM
SSMP mus
t include procedures to communicate with the public and satellite systems. 11 .1
Does the City effectively
communicate with the public and
other agencies about the
development and implementation
of the SSMP and continue to
address any feedback?
X
SSMP av
ailable on the City website is out of date and does not reflect the most current 2023 SSMP updates.
Update the file on the City website to
most current SSMP.
Effe
ctiveness of Element 11 Element is effective if updates are made. See Recommendations. 262
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EFFECTIV
ENESS EVALUATION
Pe
rformance indicators developed in the 2019 SSMP Update (Section IX: Monitoring, Measurement, and Program Modifications) were used to measure the performance of the wastewater collection system and the effectiveness of the SSMP. Performance indicator metrics were retrieved from the California Integrated Water Quality System (CIWQS) online database. Selected performance indicators are listed below. Historical results for the past ten years (2014 through June 2024) are presented in the following sections.
1. Total number of SSOs per year
2. SSO Rate (number per 100 miles per year)
3. Number of SSOs by cause (roots, grease, debris, structural failure, capacity, pump station failure, and other)
Tot
al Number of SSOs per Year
Figur
e 1 presents the trend in total number of SSOs per year, by category. SSOs have remained infrequent with an average of 1 per year based on data from 2014-2024.
Figure 1 – SSOs Per Year
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wer System Management Plan
2024 SSMP Audit Report
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y of Hercules
August 2024
SS
O Rate
F
igure 2 presents the trend in SSO rate. The SSO rate per 100 miles of gravity main has remained relatively unchanged because the length of gravity mains has not changed significantly and the number of SSOs per year is low. The City’s average SSO rate of 1.32 is below the Region 2 average rate of 3.95 SSOs per 100 miles of gravity main (Fiscal Year 2022-23)2.
Figure
2 – SSOs Per 100 Miles of Gravity Main
2 Cali
fornia Water Boards’ Annual Performance Report – Fiscal Year 2022-23 https://www.waterboards.ca.gov/about_us/performance_report_2223/index.html 264
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wer System Management Plan
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y of Hercules
August 2024
Num
ber of SSOs by Cause
Tab
le 2 presents the SSOs by cause for each year. Grease and pump station failures have historically accounted for the greatest portion of the City’s SSOs. The City has an ongoing FOG program and participates in the Contra Costa Clean Water Program, which conducts FOG inspections at food service establishments within the City. Pump station failures have occurred at a privately owned and operated lift station that contributes flow into the City’s collection system, resulting in SSOs within the City’s system.
Table 2. SSOs by Cause
Cale
ndar Year Roots De
bris G
rease Capacity
Structural
Failure Vand
alism
Pump
Station
Failure Total
201
4 1 1 0 0 0 0 0 2
201
5 0 0 0 0 0 0 0 0
201
6 0 0 0 0 0 0 0 0
201
7 0 0 1 0 0 0 0 1
201
8 0 0 0 0 0 0 0 0
201
9 0 0 0 0 0 0 2 2
202
0 0 0 1 0 0 0 0 1
202
1 0 1 0 0 0 0 0 1
202
2 0 0 1 0 0 0 1 2
202
3 0 0 0 0 0 0 0 0
202
4 0 0 0 0 0 0 0 0
Total 1 2 3 0 0 0 3 9
265
SSMP Revision Log
Appendix H
266
Sanitary Sewer Management Plan
U
pdates and Revision Log
1 City of Hercules
May 2026
Appendix H. SSMP Revision Log
Date SSMP Element Description of Change/Revision Made Person Authorizing Change
267
Sanitary Sewer Management Plan
U
pdates and Revision Log
2 City of Hercules
May 2026
Appendix H. SSMP Revision Log
Date SSMP Element Description of Change/Revision Made Person Authorizing Change
268
Sanitary Sewer Management Plan
U
pdates and Revision Log
3 City of Hercules
May 2026
Appendix H. SSMP Revision Log
Date SSMP Element Description of Change/Revision Made Person Authorizing Change
269
Concord Phoenix
1001 Galaxy Way, Suite 310
Concord CA 95420
925-949-5800
4505 E Chandler Boulevard, Suite 265
Phoenix AZ 85048
602-337-6110
Davis Pleasanton
2020 Research Park Drive, Suite 100
Davis CA 95618
530-756-5905
6800 Koll Center Parkway, Suite 150
Pleasanton CA 94566
925-426-2580
Irvine Sacramento
25 Edelman, Suite 120
Irvine, CA 92618
949-420-3030
100 Howe Avenue, Suite 110S
Sacramento CA 95825
916-306-2250
Lake Oswego San Diego
5 Centerpointe Drive, Suite 130
Lake Oswego OR 97035
503-451-4500
11545 West Bernardo Court, Suite 209
San Diego CA 92127
858-505-0075
Medford Santa Rosa
3235 Hillcrest Park Drive, Suite 106
Medford OR 97504
458-299-0843
2235 Mercury Way, Suite 105
Santa Rosa CA 95407
707-543-8506
Oceanside
804 Pier View Way, Suite 100
Oceanside CA 92054
760-795-0365
270
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Sewer System Management Plan Update
City Council Meeting | September 8, 2026
271
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Background
Sewer System Management Plan Update | July 28, 2026
State Water Board Order No. 2022-0103-DWQ requires a Sewer System Management Plan (SSMP) for all sanitary sewer systems over one mile An SSMP must be updated every 6 years and approved by the City Council
An SSMP must be audited every 3 years to evaluate effectiveness and inform next update
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What is a Sewer System Management Plan (SSMP)?
• City’s roadmap for safely operating, maintaining, and improving the sewer c
ollection system while complying with State regulations • Helps protect public health, environment, and City infrastructure by reducing s
ewer spills
SSMP Goals
Sewer System Management Plan Update | July 28, 2026
1. Operate &
Maintain
Keep the collection
system functioning
reliably
2. Ensure
Capacity
Ensure adequate
capacity for current
and future flows
3. Reduce
Sewer Spills
Minimize the
frequency and
volume of spills
4. Respond
Quickly
Rapid response,
cleanup, and
notification
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City’s Sewer System at a Glance
• 62 miles of gravity sewer main
• 1,660 m anholes
• 4 miles of f orce mains
• 6 l ift stations
• Conveys 1.2 m illion gallons per day to
Pinole-Hercules Water Pollution
Control Plant
• Average number of City spills per 100
m
iles over the last decade: 1.3
• Regional average: 3.9
Sewer System Management Plan Update | July 28, 2026
274
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Known Hot Spots
• 27 kn own hot spot locations
• Common problems include grease or root intrusion
Sewer System Management Plan Update | July 28, 2026
Inspection
Frequency Hot Spot Location
3 Months • Canterbury Footpath
• 148 Columbine
• Marigold & Columbine
4 Months
• Black Walnut & Silver
Maple
• Canterbury & Newbury
• 139 Beryl Court
• 127 Lapiz Court
6 Months
• Redwood &
Sycamore
• Redwood & Fir
• Redwood–Falcon @
Refugio
• Valley Rd Manzanita
• Turquoise &
Sycamore
• Hannah School
(Refugio Valley Rd)
• Sycamore
• Sycamore (Root
Issue)
• Bristol & Canterbury
• 226 Overlook
Terrace
• 211–214 Apollo
• Apollo
• 1003 Lavender
• Refugio Valley Rd
• 209 Ben Lomond
• N Wildwood
• Lupine & Sycamore
• Silver Maple & Black
Walnut
• Newbury
• Newbury from
Willow Ave
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SSMP Changes Since 2019
Sewer System Management Plan Update | July 28, 2026
Updated to reflect reissued Order’s element structure and terminology Revised spill emergency response procedures and reporting categories Updated to reflect organizational structure and staffing Updated to reflect current and planned operation and maintenance programs 276
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SSMP Changes Since 2019
Sewer System Management Plan Update | July 28, 2026
SSMP is certified
through CIWQS
database by the City’s
Legally Responsible
Official
Ongoing
implementation by
Public Works staff
Internal audits
conducted every three
years
Next comprehensive
update due
August 2, 2031
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Staff Recommendation
Sewer System Management Plan Update | July 28, 2026
• Adopt 2026 Sanitary Sewer Management Plan by resolution 278
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Questions and Discussion
Chris Morris, Public Works Superintendent
[email protected]
(510) 799-8252
279