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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 /> EDNA FILIPPI, <br /> FORMER EXXON RETAIL SITE 7-3942 <br /> GROUND WATER TREATMENT SYSTEM DISCHARGE <br /> SAN JOAQUIN COUNTY N <br /> California' �' orn�a �e t Regicnal Water ^uo ity Control Board, Central Valley Region, <br /> �� <br /> (hereafter Board) finds that: - <br /> 1 . Exxon Company U.S.A. submitted a Report of Waste Discharge, dated 12 August <br /> 1991 , and applied for authorization to discharge waste under the National <br /> Pollutant Discharge Elimination System (NPDES) . Additional information <br /> regarding the proposed discharge was received 28 May 1991. The Former <br /> Exxon Retail Site 7-3942 is located at 4444 Pershing Ave, Stockton (Parcel <br /> No. 110-220-17) , held in trust for Edna Filippi by Bank of Stockton. Exxon <br /> Company U.S.A. and Edna Filippi are hereafter jointly referred to as <br /> Discharger. n <br /> 2. The Discharger proposes to discharge wastewater from a ground water <br /> treatment system designed to remove petroleum hydrocarbon constituents, <br /> primarily into shallow injection wells, with the remainder into a storm <br /> drain which is tributary to the Calaveras River, a water of the United <br /> States, at a point defined as W 121019'10", N 37059'11", T2N, R6E, MDB&M. <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 around water. Approximately 15 gpm (21,600 gpd) will be <br /> discharged from the holding tank into shallow injection wells to create a <br /> hydraulic barrier, and the remaining 5 gpm (7200 gpd) discharged into the <br /> storm drain. As needed, the entire 20 gpm may be discharged to the storm <br /> 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 /ig/l EPA Method 602 <br /> Toluene 0.5 pg/1 EPA Method 602 <br />