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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION ORDERNO.97-115 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 28 December 1995, 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 it is responsible for its wastewater collection system- The City of Manteca is solely responsible for the wastewater treatment facility. 2. The Board, on 29 May 1991, adopted Waste Discharge Requirements Order No. 91-110 (NPDES No. CA 0081558)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 m&ximized by discharging effluent at agronomic rates seasonally to existing City-owned irrigation fields, and additional leased property as shown on Attachment"A!', a part of this Order. Excess flows are discharged to the San Joaquin River, awater of the United States, at a point in Section 4, T2S, R6E, MDB&K as shown on Attachment"B", a part of this Order. The City-owned irrigation fields, Assessor's parcel Nos. 241-310-16, 18, 32, 4482, 4 , 52, 53, 54, and 241-300-47, 48, 49, 50, total 283) acres. The city-leased irrigation fields, Assessor's Parcel Nos. 241-320-01 and 241-320-02,total 160 acres. 4. The City's biosolids are presently being reusedsite) and applied at city's owned land (Igo acre at agronomic rates, and limited by crop utilization rates as well as 40 CFR 50' and Depa.rtment of Health Services "California Manual of Good Practice for Landspreadin=g of Sewage Sludge"