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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION ORDER No. 74-453 NPDES 110. CA0079138 WASTE DISCHARGE REQUIREMENTS FOR CITY OF STOCYTON 14AIN 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 9 November 1973. 2. The City of Stockton Main Water Quality Control Plant discharges an average of 19.2 mgd and a maximum of 51 mgd of treated domestic and industrial waste from secondary treatment facilities into the San Joaquin River, a water of the United States, at a point one mile downstream from the Highway 4 bridge, in the ITW-1/4 of Section 17, TlN, R6E, MDB&M. 3. The report of waste discharge describes the existing discharge as follows: Average flow: 19.2 million gallons per operating day Average temperature: 80"F Summer; 54°F Winter Average BOD5: 14 mg/l Average total suspended solids: 35 mg/l Average settleable matter: 0.1 ml/l PH: 7.2 lowest monthly average; 8.8 highest monthly average 4. Maximum flows occur during the summer and fall months, with the major volume con- tributed 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 proposes to consolidate wastewater treatment in the Stockton area by accepting all wastes presently going to the Stockton Northwest and Lincoln Village treatment plants. This consolidation will most likely occur within the next five years. 6. The City of Stockton Main Water Quality Control Plant is presently in the middle of an expansion program which will result in continuing upgrading of plant effluent to meet more stringent requirements effective 1 July 1977. The plant capacity will be expanded to a maximum daily flow of 67 mgd, a 7-day average maximum flow of 61 mgd, and a 30-day average maximum flow of 58 mgd. 7. The Board on 15 June 1971 adopted an Interim Water Quality Control Plan for the Sacramento-San Joaquin Delta. The Interim Basin Plan contains water quality ob- jectives for the San Joaquin River. 8. The beneficial uses of the San Joaquin River and Delta waters are: municipal, agri- cultural, and industrial supply; recreation; esthetic enjoyment; navigation; and preservation and enhancement of fish, wildlife, and other aquatic resources.