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Attachment A CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION ORDER NO. RO-116 NPDES NO. CA0079138 WASTE DISCHARGE REQUIREMENTS FOR CITY OF STOCKTON MAIN WATER QUALITY CONTROL PLANT SAN JOAQUIN COUNTY The California Regional Water Quality Control Board, Central Valley Region, (here- after Board), finds that: 1. The City of Stockton Main Water Quality Control Plant submitted a report of waste discharge NPDES No. CA0079138, dated 29 May 1980. 2. The City of Stockton Main Water Quality Control Plant discharges an average of 24 mgd (1051 1/sec) and a maximum of 67 mgd (2935 1/sec) of treated domes- tic and industrail waste from secondary treatment facilities and when needed, 58 mgd (2540 1/sec) of treated domestic and industrial waste from tertiary treatment facilities into the San Joaquin River, a water of the United States, at a point one mile (0.6 km) downstream from the Highway 4 Bridge, in the NW-1/4 of Section 17, TIN, R6E, MDB&M. 3. The report of waste discharge describes the existing discharge as follows: Average flow: 24 mgd (1051 1/sec) Average temperature: 720F (220C) Summer; 550F (130C) Winter Average BODS: 8 mg/l Average total suspended solids: 11 mg/l Average settleable matter: <0.1 ml/l pH: 6.9 lowest monthly average; 8.3 highest monthly average 4. Maximum waste flows occur during the summer and fall months, with the major volume contributributed by the canneries connected to the city sewerage system. Liquid cannery wastes also provide the major organic loading to the plant during this period. 5. The City of Stockton has consolidated wastewater treatment in the Stockton area by accepting all wastes from the Stockton Northwest, Stockton Airport, and Lincoln Village treatment plants. 6. The Board, on 25 July 1975, adopted a Water Quality Control Plan for the Sacramento-San Joaquin Delta. The Basin Plan contains water quality objec- tives for the San Joaquin River and Delta Waters.