HomeMy WebLinkAbout09.b. Receive 2020 Sanitary Sewer Overflow (SSO) Annual Report Page 1 of 8
Item 9.b.
CENTRALSAN
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CENTRAL CONTRA COSTA SANITARY DISTRICT
March 4, 2021
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 2020 SANITARYSEWER
OVERFLOW (SSO)ANNUAL REPORT
Staff will present the attached 2020 Sanitary Sewer Overflow Annual Report at the meeting.
GOAL ONE: Customer and Community
Strategy 1—Deliver high-quality customer service
GOAL FOUR: Workforce Development
Strategy 4—Meet or exceed industry safety standards
GOAL FIVE:Infrastructure Reliability
Strategy 1—Manage assets optimally to prolong their useful life
GOAL SIX: Innovation and Optimization
Strategy 2—Improve and modernize operations through technology and efficiency measures
GOAL SEVEN:Agility andAdaptability
Strategy 1—Maintain a safe working environment for employees and the public during the COVID-19 pandemic
ATTACHMENTS:
1. Presentation
March 4, 2021 Regular Board Meeting Agenda Packet- Page 100 of 131
Page 2 of 8
ANNUAL REPORT OF SANITARY
SEWER OVERFLOWS
Paul A. Seitz
Division Manager
Collection System Operations
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Legend
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March 4, 2021 Regular Board Meeting Agenda Packet- Page 101 of 131
Page 3 of 8
2020 SANITARY SEWER OVERFLOWS
Overflows
1.56 per 00 Miles
OverflowsNo Capacity
COMPARATIVE DATA FOR 2020
FROM STATE DATABASE
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Number of 2,513 716 24
Overflows
Total Volume 20,773,865 1,217,746 49,089
(Gallons)
Overflows per
3.09 3.51 1.56
100 Miles
Average Volume 8,267 1,701 2,045
per SSO(Gallons)
*Information from CIWQS Public Spill Report—Summary Page on 1/19/21
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March 4, 2021 Regular Board Meeting Agenda Packet- Page 102 of 131
Page 4 of 8
OVERFLOWS COMPARISON
NUMBER OF OVERFLOWS
180 4 162 4
160 143141
100 - 135
140
123
120 107
100 Bl 86
80 73 63
60 65f; 43 49 48 49 43
4037 38
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2000 2001 2W2 2003 2004 200S 2006 200 2008 2009 2010 2011 2012 2013 2014 201S 2016 2017 2018 2019 2020
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OVERFLOW QUANTITIES
•
,."= Number in 2019 Number in 2020
Greater Than or
2 5
Equal to 1,000
Between 100 and 999 13 5
Between 10 and 99 5 11
Less Than 10 2 3
Total Overflow Volume 12,947 gallons 49,089 gallons
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March 4, 2021 Regular Board Meeting Agenda Packet- Page 103 of 131
Page 5 of 8
2020 OVERFLOWS
BY CITY
2020 Overflows By City
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Alamo Danville Lafayette Martinez Orinda Pleasant Hill San Ramon Walnut
Creek
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2020 OVERFLOW CAUSES
Physical
Other Plug,8% Defect,4%
Grease,13%
Roots,75%
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March 4, 2021 Regular Board Meeting Agenda Packet- Page 104 of 131
Page 6 of 8
2020 OVERFLOWS
BY PIPE SIZE AND TYPE
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AC CMLC DIP MANHOLES VCP
PIPE SIZE
■6" ■8" ■10" ■30"
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CATEGORY 1 OVERFLOWS
(ANY VOLUME OF WASTEWATER THAT REACHES THE WATERS OF THE STATE)
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075 2016 2017 2018 2019 2020
YEAR
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March 4, 2021 Regular Board Meeting Agenda Packet- Page 105 of 131
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Cleaned 761 miles of scheduled and routine sewers. 17,186 work orders were completed
on schedule 94%of the time
548 of the 761 miles(72%)were attributed to a 1,2,3,6 and 12 month schedules
152 of the 761 miles(20%)were attributed to Hotspots-1,2,and 3 month schedules
CCTV'd 130 miles of sewers.
Completed 34 spot repairs and 105 structure adjustments.
Received and cleared over 26,510 USA requests on time.
Completed 927 services on vehicles and equipment.DOT regulated services were
completed on schedule 100%of the time. Up time for vehicles was greater than 95%.
.GACD
Conducted survey of 100%of all customers'emergency calls.
204 Customer Surveys were sent to ratepayers. 73 surveys were
submitted for a return rate of 36%.
Average Customer Service rating was 3.8 out of 4.0
Received a rating of 4.0 for 4 months of the year.
Average response time was 33 minutes.
24 overflows which equates to 1.56 overflows per 100
miles. This is the second lowest on record for CentralSan
Innovation of the Year Award for the Sanitary Sewer
Overflow Simulator
The collections system conveyed 99.9996% of the
wastewater received to the treatment plant
Challenges in 2020: COVID 19, Fires, Protests, Working
with the Public, Elections, Re-Districting, New Staff
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