HomeMy WebLinkAbout14.a. Receive 2021 National Pollutant Discharge Elimination System (NPDES) Annual Report Page 1 of 5
Item 14.a.
CENTRALSAN
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CENTRAL CONTRA COSTA SANITARY DISTRICT
March 3, 2022
TO: HONORABLE BOARD OF DIRECTORS
FROM: ALAN WEER, PLANT OPERATIONS DIVISION MANAGER
REVIEWED BY: STEVE MCDONALD, DIRECTOR OF OPERATIONS
ROGER S. BAILEY, GENERAL MANAGER
SUBJECT: RECEIVE THE 2021 NATIONAL POLLUTANT DISCHARGE ELIMINATION
SYSTEM (NPDES)ANNUAL REPORT
The 2021 National Pollutant Discharge Elimination System (NPDES)Annual Report was submitted to the
California Regional Water Quality Control Board, San Francisco Bay Section, on January 30, 2022.
Plant Operations Division Manager Alan Weer will present the highlights from the annual report.
Strategic Plan re-In
GOAL ONE: Customer and Community
Strategy 2—Maintain a positive reputation
GOAL TWO: Environmental Stewardship
Strategy 1—Achieve 100% compliance in all regulations
ATTACHMENTS:
1. Presentation
March 3, 2022 Regular Board Meeting Agenda Packet- Page 99 of 165
Page 2 of 5
+ 2021 NATIONAL POLLUTANT
DISCHARGE ELIMINATION SYSTEM
1� ANNUAL REPORT
.1 .
I Board of Directors Meeting
March 3, 2022
-- Alan Weer
Plant Operations Division Manager
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2021 NATIONAL POLLUTANT DISCHARGE
ELIMINATION SYSTEM ANNUAL REPORT
Total Influent Flow Treated = 12.6 billion gallons (12.1 in 2020)
Average Daily Effluent Flow= 33.1 million gallons (33.1 in 2020)
Average Daily Influent Flow= 34.6 million gallons (35.3 in 2020)
Peak Hourly Flow= 174 million gallons per day on October 24, 2021
(78.6 in 2020)
Average Dry Weather Flow =29.5 million gallons per day (33.2 in 2020)
Ash Disposal = 3627 tons (wet weight for soil amendment), 3451 tons in
2020
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March 3, 2022 Regular Board Meeting Agenda Packet- Page 100 of 165 1
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2021 NATIONAL POLLUTANT DISCHARGE
ELIMINATION SYSTEM ANNUAL REPORT
Average Dry Weather Flow and Annual Average Influent Flow
50
45
40
35
30
25
20
15
2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021
—Average Dry Weather Flow (MGD) —Annual Average Influent Flow(MGD)
ADW F(average dry weather flow):the average daily influent flow from the three lowest influent flow months.
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2021 NATIONAL POLLUTANT DISCHARGE
ELIMINATION SYSTEM ANNUAL REPORT
CBOD—Carbonaceous Biochemical Oxygen Demand
A measure of oxygen used by microorganisms
Entero— Enterococci
A measure of bacteria
TSS—Total Suspended Solids
A measure of suspended particles
Bioassay
A measure for evaluating the potential harmful effects of effluents
discharged into surface waters
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March 3, 2022 Regular Board Meeting Agenda Packet- Page 101 of 165 2
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2021 NATIONAL POLLUTANT DISCHARGE
ELIMINATION SYSTEM ANNUAL REPORT
CBODmonthly average(mg/L)= 8.3 mg/L(Limit= 25 mg/L)
CBOD (% removal)= 95.9% (Limit= Minimum of 85%)
TSSmonthly average(mg/L)= 9.4 mg/L(Limit= 30 mg/L)
TSS (% removal)= 96.0% (Limit= Minimum of 85%)
Entero Monthly Avg. (MPN/100ml) =4 (Limit Geometric Mean of< 35)
Bioassay (11 Sample Median, % survival)= 100% (Limit= > 90%)
2021 NATIONAL POLLUTANT DISCHARGE
ELIMINATION SYSTEM ANNUAL REPORT
• 100 percent compliance with National Pollutant
Discharge Elimination System Permit requirements
• NACWA Platinum Award — 24th Consecutive Year
Peak
erformanceor��MlftN�o)-vAWARDS
Water Boards
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March 3, 2022 Regular Board Meeting Agenda Packet- Page 102 of 165 3
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ACKNOWLEDGEMENTS
Environmental Laboratory
Operations Department
Engineering Department
Administration Department
Board of Directors
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RECOMMENDATION
Receive the 2021
National Pollutant Discharge
Elimination System Annual Report
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March 3, 2022 Regular Board Meeting Agenda Packet- Page 103 of 165 4