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S E C 0 R ATTACHMENT A REMEDIAL SYSTEM PERFORMANCE EVALUATION A dual phase extraction (DPE) system, consisting of the application of combined soil vapor extraction (SVE) and groundwater extraction (GWE) technologies, was initiated at the site on June 14, 2003 A brief description and a performance evaluation of the DPE system during the third quarter 2004 are presented below Certified laboratory analytical reports, chain-of-custody documentation, and field data sheets are included as Attachment A-A Soil Vapor Extraction SVE was started on June 14, 2003 The SVE portion of the DPE system is comprised of 6 SVE wells (SVE-1, SVE-2, MW-1, MW-2, MW-4, and EW-7) and a Thermtech VAC 50 thermal/catalytic oxidizer (Cat-Ox) as the abatement device The SVE system operates under San Joaquin Valley Air Pollution Control District Permit to Operate N-4826-1-0 The SVE system was approximately 49% operational this quarter Approximately 262 pounds (lbs) of TPHg, 15 lbs of benzene, and 90 lbs of MtBE were removed this quarter An estimated 23,457 lbs of TPHg, 99 lbs of benzene, and 1,836 lbs of MtBE have been removed since remediation was initiated at the site SVE system performance data, including hours of operation, applied vacuum, flow rate, ambient dilution status, flame ionization detector (FID) field measurements, influent TPHg and benzene concentrations, and estimated mass removal data are presented in Table A-1 Soil vapor emissions data is provided in Table A-2 Graphical illustrations of soil vapor TPHg and benzene mass removal and concentration data are shown on Figures A-1 and A-2 Groundwater Extraction System The GWE portion of the DPE system is comprised of submersible pumps installed in wells EW-1 and EW-6 and "slurp" tubes installed in wells MW4 and EW-7 which are connected to an air stripper and three 2,000-granular activated carbon vessels Extracted groundwater is treated prior to discharge to a City of Stockton sanitary sewer line During the third quarter 2004, the GWE system pumped and treated approximately 203,800 gallons of groundwater, removing approximately 6 7 lbs of TPHg, 0 07 lbs of benzene, and 6 lbs of MtBE An estimated 109 5 lbs of TPHg, 3 95 lbs of benzene, and 135 4 lbs of MtBE have been removed by GWE since the DPE system began operating at the site GWE system performance data is included in Table A-3 Groundwater treatment effluent data is included in Table A-4 Graphical illustrations of TPHg and benzene mass removal from extracted groundwater and groundwater concentration data are shown on Figures A-3 and A-4 i