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REMEDIAL SYSTEM PERFORMANCE EVALUATION (ARCO) Soil vapor extraction (SVE) and air sparging (AS) were initiated on January 1, 1995 and May 5, 1995, respectively. A groundwater extraction (GWE) system was in operation onsite between 1991 and 1996. A brief description and performance evaluation of the remedial system between January 1 and March 31, 2005 is presented below. Field data are presented in Attachment 1-A. SVE System The SVE system is comprised of 14 SVE wells (V-1 through V-13, and E-6) and an Airex Katox 100 catalytic oxidizer. The SVE system was permitted by the San Joaquin County Unified Air Pollution Control District (SJCUAPCD) Permit to Operate #N-3601-1-0, which expired on December 31, 2004. The SVE system was restarted on March 15, 2000, after being off due to high groundwater elevations rendering operation not feasible. The system was shut off in October 2000 due to low influent concentrations and remained off through January 16, 2001. The system was again restarted and operated through March 1, 2001, when the system was again shut off due to low influent concentrations. The SVE system is currently not-operating at the site. SVE system influent data is presented in Tables A-1 and A-2, and a plot of SVE system influent soil vapor TPNg, benzene, and MtBE concentrations versus time is shown as Figure A-2. A plot of cumulative mass removal data is presented in Figure A-1. SVE system performance data is included in Table A-1. SVE emission data is presented in Table A-3, and SVE operational data, including well open/closed status, flow rate, and applied vacuum data, are presented in Table A-4. Air Sparging System The AS system is comprised of 9 AS wells (S-1 through S-9) and a MD Pneumatics Model 3202 7.5- horsepower (hp) blower. During the first quarter of 2005, the AS system was fully operational. AS system operational data, including well open/closed status, flow rate, and applied pressure data, are presented in Table A-5. Monitoring well dissolved oxygen (DO) data is included in Table A-6. Treatment system field data sheets are included as Attachment 1-A. Attachments: Table A-1 - Soil Vapor Extraction System Performance Data Table A-2- Soil Vapor Extraction System MtBE Removal Data Table A-3- Soil Vapor Extraction System Emission Data Table A-4- Soil Vapor Extraction System Well Data Table A-5- Air Sparging System Well Data Table A-6- Monitoring Well Dissolved Oxygen Data Attachment 1-A- Remedial System Field Data Sheets i