HomeMy WebLinkAbout14.b. Receive Collection System Operations 2021 Sanitary Sewer Overflow (SSO) Annual Report Page 1 of 7
Item 14.b.
CENTRALSAN
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CENTRAL CONTRA COSTA SANITARY DISTRICT
March 3, 2022
TO: HONORABLE BOARD OF DIRECTORS
FROM: PAUL SEITZ, COLLECTION SYSTEM OPERATIONS DIVISION MANAGER
REVIEWED BY: STEVE MCDONALD, DIRECTOR OF OPERATIONS
ROGER S. BAILEY, GENERAL MANAGER
SUBJECT: RECEIVE COLLECTION SYSTEM OPERATIONS 2021 SANITARYSEWER
OVERFLOW (SSO)ANNUAL REPORT
Staff will present the 2021 Sanitary Sewer Overflow Annual Report at the meeting.
Strategic Plan Tie-In
GOAL ONE: Customer and Community
Strategy 1—Deliver high-quality customer service
ATTACHMENTS:
1. Presentation
March 3, 2022 Regular Board Meeting Agenda Packet- Page 104 of 165
Page 2 of 7
ANNUAL REPORT OF SANITARY
SEWER OVERFLOWS
Paul A. Seitz
Division Manager
Collection System Operations
._ March 3, 2022
2021 SANITARY SEWER OVERFLOWS (SSO)
Overflows
1.69 Overflows per 100 Miles
OverflowsNo Capacity
1
March 3, 2022 Regular Board Meeting Agenda Packet- Page 105 of 165 1
Page 3 of 7
COMPARATIVE DATA FOR 2021
FROM STATE DATABASE
Number of 2,847 838 26
Overflows
Total Volume 30,237,266 15,891,067 6,811
(Gallons)
Overflows per 3.90 5.29 1.69
100 Miles
Average Volume 10,621 18,963 262
per SSO(Gallons)
* Information from California Integrated Water Quality System (CIWQS)
Public Spill Report-Summary Page on January 20,2022
' 3
OVERFLOWS COMPARISON
NUMBER OF OVERFLOWS
180- 0
162
160 143 14
140 t 135
123
120 107
100 i. 81 86
80 3 -
3
60 — 43 49 48 49 43 40 38
40 37 28
22 24 26
20
0
1999 2000'01 '02 b3 '04 b5 '06 '07 '08 '09 11 '12 '13 '14 '15 '16 '17 '18 '19 20 21
' 4
March 3, 2022 Regular Board Meeting Agenda Packet- Page 106 of 165 2
Page 4 of 7
OVERFLOW QUANTITIES
Size of • (Gallons) Number in 2020 Number in 2021
Greater Than or 5 1
Equal to 1,000
Between 100 and 999 5 10
Between 10 and 99 11 9
Less Than 10 3 6
Total Overflow Volume 49,089 gallons 6,811 gallons
CATEGORY 1 OVERFLOWS
ANY VOLUME OF WASTEWATER THAT REACHES THE WATERS OF THE STATE)
8
6 6
6
3 5
O 4
4
E 3
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2
2
1
0
2016 2017 2018 2019 2020 2021
YEAR
March 3, 2022 Regular Board Meeting Agenda Packet- Page 107 of 165 3
Page 5 of 7
2021 OVERFLOW CAUSES
Other Plug,4% Physical Defect,4%
Grease,4%
Roots,88%
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2021 OVERFLOWS
BY CITY
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March 3, 2022 Regular Board Meeting Agenda Packet- Page 108 of 165 4
On November 10,2020,a contractor damaged one of the Orinda Crossroads 30"force
mains resulting in a 22,000-gallon Category 1 overflow.
Collection System Operations(CSO)Crews responded and installed bypass pumping.
Final repairs to the damaged force main were completed on November 12,2020.
An investigation by Safety Division determined that there was a fault with the design,
Underground Service Alert(USA)requests,and the marking of the District's force
main.
Locating Standard Operating Procedure(SOP)was revised to mandate a District staff
member be present when excavating within 50'of any force main,ReW pipeline,and
Pumping Station.
Staff was present for three separate excavations that were near or adjacent to our
force mains since revising the SOP.
In the last six years,there have been 147,418 locating requests and this is the first line
that has been damaged by a contractor who made a request. A success rate of
99.99932%.
S
Cleaned 750 miles of scheduled and routine sewers. 17,112 work orders were
completed on schedule,99%of the time.
Closed-circuit televised(CCTV'd)116 miles of sewers.
Completed 75 spot repairs and 220 structure adjustments.
Received and cleared over 30,560 USA requests on time.
Completed 874 services on vehicles and equipment. Department of Transportation
(DOT)regulated services were completed on schedule,100%of the time. Uptime for
vehicles was 100%.
Conducted survey of 100%of all customers'emergency calls.
196 Customer Surveys were sent to ratepayers. 49 surveys were
submitted for a return rate of 25%.
Average Customer Service rating was 3.85 out of 4.0.
Received a rating of 4.0 for 7 months of the year.
Average response time was 30.6 minutes.
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Questions?
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