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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD CENTRAL VALLEY REGION ORDER NO. NPDES NO. CA0079154 WASTE DISCHARGE REQUIREMENTS FOR CITY OF TRACY SAN JOAQUIN COUNTY The California Regional Water Quality Control Board,Central Valley Region, (hereafter Board) finds that: 1. The City of Tracy (hereafter Discharger) submitted a Report of Waste Discharge, dated T I May 1995, and applied for an updated permit to discharge waste under the National Pollutant Discharge Elimination System(NPDES). e 2. The Discharger discharges 9.0 mgd of domestic and industrial waste from secondary n treatment facilities into Old River, a water of the United States, at a point four miles north of the City of Tracy in the E 1/2 of projected Section 34. See Attachment "A", incorporated t: herein and made part of this Order. 3.- The Discharger owns and operates a wastewater collection, treatment, and disposal system, a and provides sewerage service to the City of Tracy. The treatment plant is in Section 16, TIS, R5E, MDB&M., as shown on Attachment A. Treated municipal wastewater is discharged to Old River (Outfall No. 1), a water of the United States, and tributary to Middle River, San Joaquin River and the Delta waters at the point, latitude 37 deg., 48 min., 07 sec. and longitude 121 deg., 24 min., 03 sec.. 4. The treatment system consists of primary clarification, activated biological tower filtration, aeration, final clarification, and chlorination; with activated sludge processing. Sludge is dewatered in drying beds and disposed of as a soil amendment at an off-site property owned by the City of Tracy. The Report of Waste Discharge describes the City of Tracy's discharge as follows: Average Flow: 4.5 million gallons per day (mgd) Design Flow: 9.0 million gallons per day (mgd) Average Temperature: 77°F (25°C) Summer; 64T (18°C) Winter BOD: 16 mg/l, 774 lbs/day(annual average) Suspended Solids: 9 mg/l,435 lbs/day (annual average) 5. The Environmental Protection Agency and the Regional Board have classified this discharge as a major discharge. 6. The Discharger has five wastewater holding ponds that are used to provide aerated treatment for peak industrial wastewater flows during the summer canning season (see Attachment A). The holding ponds are shallow unlined ponds that cover an area of approximately 53 acres. The holding ponds receive partially treated influent with high Total Dissolved Solids (TDS) and/or BODS wastewater from Tracy's industrial users. 7. The Discharger submitted the City of Tracy Wastewater Treatment Plant Holding Ponds Investigation on 8 June 1995. The groundwater monitoring performed during the investigation concluded that the ponds are in hydraulic connection to groundwater and that the groundwater discharges to Sugar Cut Slough adjacent to the ponds. The investigation