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CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD <br /> CENTRAL VALLEY REGION �( <br /> ORDER NO. 92- 113 <br /> ® NPDES NO. CA0082911 <br /> WASTE DISCHARGE REQUIREMENTS <br /> FOR <br /> CITY OF STOCKTON <br /> AUSTIN ROAD LANDFILL <br /> GROUND WATER TREATMENT SYSTEM AND STORM WATER DISCHARGE <br /> SAN JOAQUIN COUNTY <br /> The California Regional Water Quality Control Board, Central Valley Region, <br /> (hereafter Board) finds that: <br /> 1 . The City of Stockton (hereafter Discharger) submitted a Report of Waste <br /> Discharge, dated 24 December 1991, and applied for authorization to �( <br /> discharge waste under the National Pollutant Discharge Elimination System U <br /> (NPDES) . The Discharger submitted addenda to the Report of Waste <br /> Discharge; dated 27 March 1992, which contained the calculations for the <br /> air stripping tower design; and dated 17 April 1992, which addressed the <br /> future addition of the landfill gas condensate to the ground water <br /> treatment system. <br /> 2. The Discharger proposes to discharge waste from a ground water treatment <br /> system designed to remove volatile organic compounds from ground water. <br /> Treated ground water will be discharged into the north branch of the south <br /> fork of Littlejohns Creek which is tributary to the San Joaquin River, a <br /> water of the United States, at a point defined as W 121°11140, N 3705313", <br /> as shown on Attachment A, which is attached hereto and made part of this <br /> Order by reference. <br /> 3. Pumped ground water will be treated by passing it through an air stripper, <br /> and the water discharged to a manhole prior to discharge to Littlejohns <br /> Creek. The stripped air is serially passed through two exchangeable <br /> activated carbon units. The activated carbon is regenerated or disposed of <br /> off-site. The treatment system is designed for a flow of 400 gpm (580,000 <br /> gpd) of extracted ground water. About 305 gpm (440,000 gpd) will be <br /> discharged to Littlejohns Creek. <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 /> 1,1 Dichloroethane 0.5 ug/1 EPA Method 601 <br /> 1,2 Dichloroethane 0.5 Ag/1 EPA Method 601 <br />