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ATTACHMENT A REMEDIAL SYSTEM PERFORMANCE EVALUATION Soil vapor extraction (SVE) and groundwater extraction (GWE) systems began operation at the site on June 14, 2003 A brief description and a performance evaluation of the SVE/GWE system during the fourth quarter 2003 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 OPE 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 87% operational this quarter Approximately 4,308 pounds (lbs) • of TPHg, 4 5 lbs of benzene, and 69 lbs of MtBE were removed this quarter An estimated 20,138 lbs of TPHg, 90 lbs of benzene, and 1,680 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 (FED) 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 2 GWE wells (EW-1 and EW-6), 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 fourth quarter 2003, the GWE system pumped and treated approximately 116,000 gallons of groundwater, removing approximately 27 3 lbs of TPHg, 1 63 lbs of benzene, and 26 7 lbs of MtBE An estimated 74 8 lbs of TPHg, 3 15 lbs of benzene, and 88 2 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