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y <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGION <br /> ORDER NO. <br /> NPDES NO. CA <br /> WASTE DISCHARGE REQUIREMENTS <br /> FOR <br /> ARCO PRODUCTS COMPANY FE <br /> ARCO STATION 434 <br /> GROUND WATER TREATMENT SYSTEM DISCHARGE <br /> SAN JOAQUIN COUNTY <br /> The California Regional Water Quality Control Board, Central Valley Region, <br /> .(hereafter Board) fi-nd's-...khat:: . .. . . , �,.�. v <br /> 1. ARCO Products Company (hereafter Discharger) submitted a Report of Waste <br /> Discharge, dated 15 March 1991, and applied for authorization to dischare <br /> waste under the National Pollutant Discharge Elimination System (NPDES}?. <br /> Additional information regarding the proposed discharge was received 28 May <br /> 1991. <br /> 2. The Discharger proposes to discharge waste from a gasoline-spill ground <br /> water treatment system into a storm drain tributary to South Main Canal , a <br /> water of the United States, at a point in Section 11, T3N, R6E, MDB&M. <br /> Pumped ground water will be treated serially through two exchangeable A activated carbon units, and then discharged to the storm drain. The <br /> activated carbon is regenerated or disposed of off-site. When breakthrough <br /> of the lead carbon unit is detected, the lead unit is removed, the trailing <br /> unit switched to the lead position, and a fresh unit is installed in the <br /> trailing position. <br /> The treatment system is initially designed for a flow of 2 gpm (3000 gpd) <br /> of extracted ground water. Should continued investigation of the ground <br /> water plume determine that higher extraction rates are needed to capture <br /> the contaminants, the treatment system may be expanded to treat up to 15 <br /> - gpm (21 ,600 gpd) . <br /> 3. The Report of Waste -Discharge describes the initial proposed discharge as <br /> follows: <br /> Monthly Average Flow: 2200 gallons per day (gpd) <br /> Maximum Daily Flow: 2880 gpd <br /> Design Flow: 2880 gpd <br /> Constituent m i % <br /> Total Petroleum <1 mg/l <br /> Hydrocarbons <br /> Benzene <0.7 ug/l <br /> Ethylbenzene <680 ug/l <br /> Toluene <100 ug/l RIE <br /> Xylene <620 ug/l ' <br /> Lead 0.01 mg/l <br />