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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGION <br /> ORDER NO. 94-324 <br /> NPDES NO. CA0079138 <br /> WASTE DISCHARGE REQUIREMENTS <br /> FOR <br /> CITY OF STOCKTON <br /> REGIONAL WATER QUALITY CONTROL PLANT <br /> SAN JOAQUIN COUNTY <br /> The California Regional Water Quality Control Board, Central Valley Region, (hereafter Board) finds <br /> that: <br /> 1. The City of Stockton (hereafter Discharger) submitted a Report of Waste Discharge, dated <br /> 2 October 1990, and applied for renewal of a permit to discharge waste under the National <br /> Pollutant Discharge Elimination System (NPDES) from the Stockton Regional Water Quality <br /> Control Plant. Additional information was submitted 4 February 1991, 25 October 1991, <br /> 30 November 1992, 7 September 1993, 29 September 1993, 30 December 1993, 11 -February <br /> 1994, 28 April 1994, 26 July 1994, 13 September 1994, 20 September 1994, 22 September <br /> 1994, 27 September 1994, 28 September 1994, 5 October 1994, 6 October 1994, 14 October <br /> 1994, and 20 October 1994. <br /> 2. The Discharger owns and operates a wastewater collection, treatment, and disposal system, and <br /> provides sewerage service to the City of Stockton, as well as the Port of Stockton and <br /> surrounding urbanized County areas. The treatment plant is in TIN, R6E, MDB&M, as shown <br /> on Attachment A, a part of this Order. The treatment plant is on property owned by the <br /> Discharger. Treated municipal wastewater is discharged to the San Joaquin River, a water of <br /> the United States and part of the Sacramento-San Joaquin Delta at a point, latitude 37,56,20", <br /> and longitude 121',19',30". <br /> 3. The treatment system includes trickling filters and post secondary treatment in 630 acres of <br /> polishing ponds. Tertiary treatment, dissolved air flotation and filtration, is used when <br /> necessary to meet effluent limitations. Sludge is dewatered by belt press and is reclaimed off- <br /> site. The Report of Waste Discharge describes the existing discharge as follows: <br /> Monthly Average Dry Weather Flow: 34.4 million gallons per day (mgd) <br /> Design Flow Dry Weather <br /> (Secondary Plant): 38 mgd <br /> Design Flow Dry Weather <br /> (Tertiary Plant): 55 mgd <br /> Daily Peak Wet Weather Flow <br /> (Tertiary Plant): 67 mgd <br /> Average Temperature: 79 °F summer; 54 °F winter <br />