HomeMy WebLinkAbout09.a. Receive 2020 NPDES Annual Report Page 1 of 5
Item 9.a.
CENTRALSAN
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CENTRAL CONTRA COSTA SANITARY DISTRICT
March 4, 2021
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 2020 NATIONAL POLLUTANT DISCHARGE ELIMINATION
SYSTEM (NPDES)ANNUAL REPORT
Receive the 2020 National Pollutant Discharge Elimination System (NPDES)Annual Report.
Strategic Plan re-In
GOAL TWO: Environmental Stewardship
Strategy 1—Achieve 100% compliance in all regulations
GOAL FOUR: Workforce Development
Strategy 4—Meet or exceed industry safety standards
ATTACHMENTS:
1. 2020 National Pollutant Discharge Elimination System Annual Report
March 4, 2021 Regular Board Meeting Agenda Packet- Page 95 of 131
Page 2 of 5
r.
2020 NATIONAL POLLUTANT
DISCHARGE ELIMINATION SYSTEM
ANNUAL REPORT
Board of Directors Meeting
March 4, 2021
s,
Alan Weer
Plant Operations Division Manager
2020 NATIONAL POLLUTANT DISCHARGE
ELIMINATION SYSTEM ANNUAL REPORT
Total flow treated = 12.1 billion gallons (15.1 in 2019)
Average daily effluent flow= 33.1 million gallons (38.6 in 2019)
Average daily influent flow= 35.3 million gallons (41.2 in 2019)
Peak hourly flow= 78.6 million gallons per day on April 5, 2020
(174 in 2019)
Average Dry Weather Flow = 33.4 million gallons per day
(34.1 in 2019)
Ash disposal = 3451 tons(wet weight for soil amendment), 3514 tons
in 2019
March 4, 2021 Regular Board Meeting Agenda Packet- Page 96 of 131
Page 3 of 5
2020 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
—Average Dry Weather Flow (MGD) —Annual Average Influent Flow(MGD)
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ADWF(average dry weather flow):the average daily influent flow from the three lowest influent flow months.
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2020 NATIONAL POLLUTANT DISCHARGE
ELIMINATION SYSTEM ANNUAL REPORT
BOD/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 4, 2021 Regular Board Meeting Agenda Packet- Page 97 of 131
Page 4 of 5
2020 NATIONAL POLLUTANT DISCHARGE
ELIMINATION SYSTEM ANNUAL REPORT
CBODmonthlyaverage(mg/L)= 6.8 mg/L(Limit= 25 mg/L)
CBOD (% removal) = 96.6% (Limit= Minimum of 85%)
TSSmonthly average (mg/L)= 8.9 mg/L(Limit= 30 mg/L)
TSS (% removal) = 96.5% (Limit= Minimum of 85%)
Entero (MPN/100ml) = 2 (Limit= Geometric Mean of< 35)
Bioassay(11 Sample Median in % survival) = 100% (Limit= > 90%)
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2020 NATIONAL POLLUTANT DISCHARGE
ELIMINATION SYSTEM ANNUAL REPORT
• 100 percent compliance with National Pollutant
Discharge Elimination System Permit requirements
• NACWA Platinum Award — 23rd Consecutive Year
Peak
)V— Performance
AWARDS
0 7 7
Water Boards
March 4, 2021 Regular Board Meeting Agenda Packet- Page 98 of 131
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ACKNOWLEDGEMENTS
Environmental Laboratory
Operations Department
Engineering Department
Administration Department
Board of Directors
RECOMMENDATION
Receive the 2020
National Pollutant Discharge
Elimination System Annual Report
March 4, 2021 Regular Board Meeting Agenda Packet- Page 99 of 131