SITE INFORMATION AND CORRESPONDENCE_1985-2004

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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION ORDER NO. 91-110 NPDES NO. CA0081558 WASTE DISCHARGE REQUIREMENTS FOR CITY OF MANTECA AND CITY OF LATHROP WASTEWATER QUALITY CONTROL FACILITY SAN JOAQUIN COUNTY The California Regional Water Quality Control Board, Central Valley Region, (hereafter Board) finds that: 1. The City of Manteca and the City of Lathrop (hereafter Discharger) submitted a Report of Waste Discharge, dated 2 March 1990, and applied for a permit renewal to discharge waste under the National Pollutant Discharge Elimination System (NPDES) . The City of Manteca's wastewater treatment plant accepts wastewater flows from certain areas of the City of Lathrop, therefore the City of Lathrop is also named in this permit and is responsible for its wastewater collection system. The City of Manteca is solely responsible for the wastewater treatment facility. 2. The Board, on 26 April 1985, adopted Waste Discharge Requirements Order No. 85- 068 (NPDES No. CA0081558) which prescribed requirements for a discharge of 5.75 million gallons per day (mgd) of treated combined domestic and industrial wastewater to land and partially to surface water. Land disposal of effluent is maximized by discharging effluent at agronomic rates throughout the year to existing City-owned irrigation fields, as shown on Attachment "A", a part of this Order. Excess flows are discharged to the San Joaquin River, a water of the United States, at a point in Section 4, T2S, R6E, MDB&M, as shown on Attachment "B", a part of this Order. 3. The City-owned irrigation fields, Assessor's Parcel Nos. 241-310-16, 18, 32, 44, 48, 52, 53, 54, and 241-300-47, 48, 49, 50, total 283 acres. 4. The Discharger proposes to expand the plant's treatment capacity to 6.95 mgd to treat increasing flows from population growth. The expansion will include the addition of a primary clarifier and a secondary clarifier. 5. The Report of Waste Discharge describes the expanded discharge as follows: Average Flow: 4.20 mgd Design Flow: 6.9 mgd BOD: 13 mg/l Suspended Matter: 10 mg/l 6. The Environmental Protection Agency (EPA) and the Board have classified this discharge as a major discharge. 7. The Board, on 31 March 1989, adopted the Second Edition of the Water Quality Control Plan for the San Joaquin River Basin (5C) which contains water quality objectives for all waters of the basin. These requirements are consistent with that Plan.