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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGION <br /> ORDER NO. <br /> NPDES NO. CA0082881 <br /> WASTE DISCHARGE REQUIREMENTS <br /> FOR <br /> EXXON COMPANY U.S.A. , AND <br /> FORMER EXXON RETAIL SITE 7-3942 <br /> GROUND WATER TREATMENT SYSTEM DISCHARGE <br /> SAN JOAQUIN COUNTY <br /> The California Regional Water Quality Control Board, Central Valley Region, D <br /> (hereafter Board) finds that: <br /> 1. Exxon Company U.S.A. (hereafter Discharger) submitted a Report of Waste <br /> Discharge, dated 12 August 1991, and applied for authorization to discharge <br /> waste under the National Pollutant Discharge Elimination System (NPDES) . <br /> Additional information regarding the proposed discharge was received 28 May <br /> 1991. The Former Exxon Retail Site 7-3942 is located at 4444 Pershing Ave, dun}U <br /> Stockton (Parcel No. 110-220-17) , held in trust for Edna Filippi by Bank of <br /> Stockton. <br /> 2. The Discharger proposes to discharge waste from a gasoline-spill ground n <br /> water treatment system primarily into shallow injection wells, with the <br /> remainder into a storm drain which is tributary to the Calaveras River, a U U <br /> water of the United States, at a point defined as W 121019' 10 N <br /> 37059'11", T2N, R6E, MDB&M, as shown on Attachment A, which is attached <br /> hereto and part of the Order by reference. <br /> 3. Pumped ground water will be passed through an air stripper followed by two <br /> serially operated exchangeable activated carbon units, and then discharged <br /> to a holding tank. The activated carbon is regenerated or disposed of off- <br /> site. The treatment system is designed for a flow of 20 gpm (28,800 gpd) <br /> of extracted ground water. Approximately 15 gpm (21,600 gpd) will be <br /> discharged from the holding tank into shallow injection wells to create a II <br /> hydraulic barrier, and the remaining 5 gpm (7200 gpd) discharged into the L <br /> storm drain. <br /> 4. The proposed wastewater treatment technology is capable of dependably <br /> removing the following constituents to concentrations which are generally <br /> non-detectable by current analytical technology. The commonly achieved <br /> detection levels are as follows: <br /> Detection Analytical <br /> Constituent Level Units Method <br /> Total Petroleum 50 Ng/l EPA Method 8015 <br /> Hydrocarbons <br /> Benzene 0.5 Ng/l EPA Method 602 <br /> Toluene 0.5 pg/l EPA Method 602 <br /> Xylene 0.5 pg/l EPA Method 602 <br /> Ethylbenzene 0.5 Ng/l EPA Method 602 <br />