HomeMy WebLinkAbout12.a. Receive 2017 National Pollutant Discharge Elimination System (NPDES) Annual Report Page 1 of 8
Item 42.a.
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Central Contra Costa Sanitary District
February 1, 2018
TO: HONORABLE BOARD OF DIRECTORS
FROM: ALAN WEER, PLANT OPERATIONS DIVISION MANAGER
REVIEWED BY: ANN SASAKI, DEPUTY GENERAL MANAGER
ROGER S. BAILEY, GENERAL MANAGER
SUBJECT: RECEIVE THE 2017 NATIONAL POLLUTANT DISCHARGE ELIMINATION
SYSTEM (NPDES)ANNUAL REPORT
The 2017 National Pollutant Discharge Elimination System (NPDES)Annual Report was submitted to the
California Regional Water Quality Control Board (RWQCB), San Francisco Bay Section, on January 29,
2018.
Plant Operations Division Manager Alan Weer will present the highlights from the annual report.
GOAL ONE: Provide Exceptional Customer Service
Strategy 2- Improve Interdepartmental Collaboration
ATTACHMENTS:
2017 NPDES Annual Report Presentation
February 1, 2018 Regular Board Meeting Agenda Packet- Page 91 of 148
2017 NATIONAL POLLUTANT
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DISCHARGE ELIMINATION SYSTEM
ANNUAL REPORT
Board of Directors Meeting
February 1 , 2018
" Alan Weer
Plant Operations Division Manager
2017 NATIONAL POLLUTANT DISCHARGE
ELIMINATION SYSTEM ANNUAL REPORT
Total flow treated = 16. 1 billion gallons (12.96 billion in 2016)
Average daily flow = 44.0 million gallons (35.4 million in 2016)
Peak hourly flow = 181 million gallons per day (127 million in 2016)
Ash disposal = 4,052 tons
(wet weight for soil amendment; 4, 170 tons in 2016)
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2017 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
2017 NATIONAL POLLUTANT DISCHARGE
ELIMINATION SYSTEM ANNUAL REPORT
CBODmonthly average (mg/L) = 6.8 mg/L (Limit = 25 mg/L)
CBOD (% removal) = 96.4% (Limit = Minimum of 85%)
TSSmonthly average (mg/L) = 7.3 mg/L (Limit = 30 mg/L)
TSS (% removal) = 97.0% (Limit = Minimum of 85%)
Entero (MPN/100ml) = 4 (Limit = Geometric Mean of < 35)
Bioassay (% survival) = 97% (Limit = 11 Sample Median > 90%)
2017 NATIONAL POLLUTANT DISCHARGE
ELIMINATION SYSTEM ANNUAL REPORT
Completed over 15,000 analytical tests
Approximately 11 ,000 hours of laboratory work
100 percent compliance with National Pollutant
Discharge Elimination System Permit requirements
NACWA Platinum Award — 20th Consecutive Year
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ACKNOWLEDGEMENTS
Environmental Laboratory
Operations Department
Engineering Department
Administration Department
Board of Directors
14.
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tECOMMENDATION
Receive the 2017 NPIDES Annual Report
' *February 1, 201 g pard Meeting Agen -