CITY OF SEBASTOPOL
CITY COUNCIL
AGENDA ITEM
Meeting Date: August 2, 2022
To: Honorable Mayor and City Councilmembers
From: Public Works Superintendent, Dante Del Prete
Subject: Annual Performance Report on Sanitary Sewer System Recommendation: City Council Receive Report of Annual Performance on Sanitary Sewer System (No action Required)
Funding: Currently Budgeted: _ Yes _ No X N/A
Net General Fund Cost: $0.00
Account Code/Costs authorized in City Approved Budget (if applicable) ___AK_____ (verified by Administrative Services Department) INTRODUCTION/PURPOSE:
The item tonight is for the City Council to receive the Annual Performance on Sanitary Sewer System Report. This informational report is one of the required components of the approved Sewer System Management Plan (SSMP).
BACKGROUND:
At the September 15, 2020 City Council meeting, the City Council accepted and certified a revised Sewer System Management Plan for the City of Sebastopol. One of the required elements of this plan is an annual review and report of the sewer system performance.
DISCUSSION:
The SSMP consists of eleven elements, one of which is the annual performance report to the City Council.
Per the SSMP Element XI, staff is to present annually to the City Council the following for calendar year 2020:
• Number of Sanitary Sewer Overflows (SSO’s) in the past year • Number of SSO’s per cause
• SSO rate per year per 100 miles of sewer mains compared to the average for California Region 1 • Portion of sewage recovered compared to total volume spilled • Collection system performance results
The attachments to this report provide the information described above, with the exception of the SSO rate per year per 100 miles of sewer mains and the comparison to the California Region 1 agencies’ average.
The City of Sebastopol sewer system had 2 (two) SSO’s for the 32 miles of sewer mains in Sebastopol, which equates to 3.1 SSO’s per 100 miles of sewer mains. This is below the average for California Region 1 system size comparison, which was 5.9 SSOs per 100 miles of sewer mains.
The cause of the 2021 SSO’s were identified as debris-wipes/non-dispersible. There was one category 1 overflow of 5,700 gallons with 247 recovered and the second spill was a category 3 overflow of 10 total gallons all of which all was recovered and returned to the Sanitary Sewer System.
Agenda Item Number 5
Agenda Item Number 5
City Council Meeting Packet for August 2, 2022
GOALS:
Goal CSF 1: Provide High Quality Community Services, Facilities, and Infrastructure to All Residents, Businesses, and Visitors in Sebastopol.
Goal CSF 4: Provide Adequate Sewer Service Capacity to Serve Existing and Future Demands PUBLIC COMMENT:
As of the writing of this staff report, the City has not received any public comment. However, if staff receives public comment from interested parties following the publication and distribution of this staff report such comments will be provided to the City Council as supplemental materials before or at the meeting. In addition, public comments may be offered during the “Public Comment” portion of the City Council discussion of this item.
PUBLIC NOTICE:
This item was noticed in accordance with the Ralph M. Brown Act and was available for public viewing and review at least 72 hours prior to schedule meeting date.
FISCAL IMPACT:
There are no costs associated with this informational report.
RECOMMENDATION:
Staff recommends that the City Council receive this annual performance report on the City of Sebastopol’s sanitary sewer system information. No action is required.
ATTACHMENT:
Sanitary Sewer Overflows shown in tables and graph
Agenda Item Number 5
Agenda Item Number 5
City Council Meeting Packet for August 2, 2022
Calendar
Year
Gravity Sewer
SSOs
Pump Station
SSOs
Force Main
SSOs
Total Volume Spilled
(Gallons)
Portion Contained
and Returned to Sewers
(Gallons)
Total Volume
Entering Surface Waters
(Gallons)
2012 1 0 0 194 100 94
2013 3 0 0 527 11 516
2014 2 0 0 826 1 825
2015 6 0 0 28,341 12 28,329
2016 5 0 0 1,310 328 982
2017 1 1 0 2,039 0 2,039
2018 4 0 0 1,926 271 1,655
2019 0 0 0 0 0 0
2020 1 0 0 19 19 0
2021 2 0 0 5,710 257 5,453
CY Roots Debris Grease Cap./
Infil. Vndl. PipeFailure
PS
Failure
Force
Main
Failure
Other Total
2012 1 0 0 0 0 0 0 0 0 1
2013 0 3 0 0 0 0 0 0 0 3
2014 2 0 0 0 0 0 0 0 0 2
2015 2 3 0 0 0 0 1 0 0 6
2016 3 1 1 0 0 0 0 0 0 5
2017 1 0 0 0 0 0 1 0 0 2
2018 2 2 0 0 0 0 0 0 0 4
2019 0 0 0 0 0 0 0 0 0 0
2020 0 1 0 0 0 0 0 0 0 1
2021 0 2 0 0 0 0 0 0 0 2
Total 11 9 1 0 0 0 2 0 0 23
1 3
2 6
5 2
4 0
1 2
0 1
2 3
4 5
6 7
2012 2013 2014 2015 2016 2017 2018 2019 2020 2021
SSOs
Sanitary Sewer Overflows by Calendar Year
Agenda Item Number 5
Agenda Item Number 5
City Council Meeting Packet for August 2, 2022