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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGION <br /> ORDER NO. <br /> NPDES NO. CA0079138 <br /> WASTE DISCHARGE REQUIREMENTS <br /> FOR <br /> CITY OF STOCKTON MAIN WATER QUALITY CONTROL PLANT <br /> SAN JOAQUIN COUNTY <br /> The California Regional Water Quality Control Board, Central Valley Region, <br /> (hereafter Board), finds that: <br /> 1. The City of Stockton Main Water Quality Control Plant (hereafter Dis- <br /> charger) submitted a Report of Waste Discharge NPDES No. CA0079138, dated <br /> 31 January 1985. <br /> 2. The City of Stockton Main Water Quality Control Plant discharges an average <br /> of 29 mgd and a maximum of 67 mgd of treated domestic and industrial waste <br /> from secondary treatment facilities and when needed, 58 mgd of treated <br /> domestic and industrial waste from tertiary treatment facilities into the <br /> San Joaquin River, a water of the United States , at a point one mile <br /> downstream from the Highway 4 Bridge, in the NW-1/4 of Section 17, TIN, <br /> R6E, MDB&M. <br /> 3. The Report of Waste Discharge describes the existing discharge as follows: <br /> Average flow: 29 mgd <br /> Lowest monthly average flow: 22 mgd <br /> Highest monthly average flow: 34 mgd (canning season) <br /> Average temperature: 79 OF (22 °C) Summer; 54 OF (13 °C) <br /> Winter <br /> Average BODS: 6 mg/l <br /> Average total suspended solids: 15 mg/l <br /> Average settleable matter: <0.1 ml/l <br /> pH: 6.1 lowest monthly average; <br /> 7.1 highest monthly average <br /> 4. Maximum waste flows occur during the summer and fall months, with the major <br /> volume contributed by the canneries connected to the city sewage system. <br /> Liquid canning wastes also provide the major organic loading to the plant <br /> during this period. <br />