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i ATTACHMENT A REMEDIAL SYSTEM PERFORMANCE EVALUATION Soil vapor extraction (SVE) and air sparging were initiated on January 1, 1995 and May 5, 1995, respectively A brief description and performance evaluation of the remedial system between March 15, 2000 and June 29, 2000 is presented below 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 is permitted by the San Joaquin County Unified Air Pollution Control District (SJVUAPCD)Permit to Operate Number N-3601-1-0, which expires on January 1,2001 The SVE system was re-started on March 15, 2000 after being off due to high groundwater elevations making . operation of the SVE system not feasible The SVE system was approximately 74 percent operational this quarter Downtime associated with the SVE system operation was due to a power failure that shut the system off during the month of May SVE system influent data is presented in Tables A-1 and A-2 and a plot of SVE system influent soil vapor TPHg, benzene, and MtBE concentrations versus time is shown as Figure A-1 During the second quarter of 2000, the SVE system removed 209 pounds of gasoline and 0 1 pounds of benzene and 2 4 pounds of MtBE from the soil beneath the site 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 air sparge system is comprised of 9 air sparge wells (S-1 through S-9) and a MD Pneumatics Model 3202 7 5-horsepower blower During the second quarter, the air spargtng system was fully operational Air spargmg system operational data, including well open/closed status, flow rate, and applied pressure data are presented in Table A-5 Moiutoring well dissolved oxygen data is shown on Table A4 Treatment system field data sheets are included as Attachment A-A Conclusion SECOR will continue to operate the SVE/AS system until the operation of the SVE system is not feasible due to low influent concentrations or high groundwater levels