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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION ORDER NO. NPDES NO. CA0081558 WASTE DISCHARGE REQUIREMENTS FOR CITY OF MANTECA AND LATHROP COUNTY WATER DISTRICT SAN JOAQUIN COUNTY The California Regional Water Quality Control Board, Central Valley Region, (here- after Board) finds that: 1. The City of Manteca and Lathrop County Water District (hereafter Discharger) submitted a Report of Waste Discharge, dated 6 February 1984, and applied for a permit to discharge waste under the National Pollutant Discharge Elim- ination System. 2. The Discharger currently discharges approximately 2.5 million gallons per day (mgd) (110 1/sec) of combined domestic and industrial wastewater to land. Population growth and acceptance of the community of Lathrop's sewage necess- itates the expansion of the treatment and disposal facilities. Consequently, the Discharger proposes to increase its discharge rate to 5.75 mgd (252 1/sec) . 3. The proposed project will upgrade wastewater treatment to secondary levels, construct a sewer system and interceptor for the community of Lathrop, expand plant capacity to treat flows from Lathrop, develop additional irrigation fields for effluent land disposal , and discharge effluent in excess of the disposal capacity of the irrigation fields to the San Joaquin River. Project completion is scheduled for 1986. 4. The Discharger proposes to maximize land treatment of its effluent by dis- charging effluent at agronomic rates throughout the year to existing and proposed irrigation fields. Excess flows will be discharged to the San Joaquin River, a water of the United States, at a point in Section 4, T2S, R6E, MDB&M. 5. EPA and the Regional Board have classified this discharge as a major dis- charge. 6. The Board, on 25 July 1975, adopted a Water Quality Control Plan for the San Joaquin River Basin (5C) which contains water quality objectives . These requirements are consistent with that Plan. 7. The beneficial uses of the San Joaquin River are domestic, municipal , indus- trial , and agricultural supply; recreation; esthetic enjoyment; ground water recharge, and preservation and enhancement of fish, wildlife and other aquatic resources.