HomeMy WebLinkAbout08.a. Accept 2012 (NPDES) National Pollutant Discharge Elimination System Annual ReportCentral Contra Costa Sanitary District ' BOARD OF DIRECTORS POSITION PAPER Board Meeting Date: January 24, 2013 subject: BOARD ACCEPTANCE OF THE 2012 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES) ANNUAL REPORT Submitted By Mary Lou Esparza Laboratory Superintendent Initiating Dept /Div.: Plant Operations / Laboratory REVIEWED AND RECOMMENDED FOR BOARD ACTION. �, 6 M. parza D raig Curtis W. Swanson Interim General Manager ISSUE: The Central Contra Costa Sanitary District's (District) 2012 National Pollutant Discharge Elimination System (NPDES) Annual Report has been prepared for submission to the California Regional Water Quality Control Board (RWQCB), San Francisco Bay Section. This annual report is presented to the Board of Directors' for information and acceptance. The Sewer System Overflow and Recycled Water Annual Reports will be submitted separately at later dates. RECOMMENDATION: Accept the 2012 NPDES Annual Report. FINANCIAL IMPACTS: None ALTERNATIVES /CONSIDERATIONS: None BACKGROUND: During 2012, the treatment plant received a total of 13.7 billion gallons of wastewater, which equates to an average flow of 37.6 million gallons per day. This average flow is approximately 4.8 percent lower than in 2011. The treatment plant produced an effluent with annual average carbonaceous biochemical oxygen demand (C -BOD) and total- suspended solids (TSS) concentrations of 6 mg /L and 8 mg /L, respectively. These concentrations are markedly lower than our NPDES permit standards of 25 mg /L and 30 mg /L, respectively. Both C -BOD and TSS removal efficiency for the treatment plant averaged 97 percent. Solids disposal during the year involved the incineration of dewatered sludge in the District's multiple -hearth furnaces. Approximately 3,657 tons of furnace ash was produced. The ash met regulatory requirements for final disposal throughout the year. More than 15,000 tests were completed to comply with the NPDES permit. The treatment plant effluent met all (100 percent) of the NPDES permit requirements throughout the year, which makes this the fifteenth consecutive year of full compliance. N: \POSUP \Board of Directors \Board - Position Papers\2013 \NPDES Annual Report 01- 24- 13.doc �M' POSITION PAPER Board Meeting Date: January 24, 2013 subject. BOARD ACCEPTANCE OF THE 2012 NATIONAL POLLUTANT DISCHARGE ELIMINATION SYSTEM (NPDES) ANNUAL REPORT The District's NPDES permit requires the annual report to have four content areas that cover the following: • A comprehensive discussion of treatment plant performance and compliance with the permit. This includes a statement about all projects that were completed to improve performance and reliability of the District's wastewater treatment, collection and disposal practices in 2012. • List of Approved Analyses. • Plant schematic. • Annual review of Facility Reports. Additionally, the District has compiled yearly totals, averages, maximum and minimum values for influent, final effluent, sludge, and receiving water quality parameters for Board review and District staff use. This information has been submitted to the RWQCB electronically and is not a required component of the annual report. Upon acceptance of this annual report by the District Board of Directors, it will be submitted to the RWQCB. The NPDES permit requires the annual report be submitted to the RWQCB by February 1, 2013. RECOMMENDED BOARD ACTION: Accept the 2012 National Pollutant Discharge Elimination System Annual Report. NAPOSUP \Board of Directors \Board - Position Papers\2013 \NPDES Annual Report 01- 24- 13.doc