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r� <br /> ATTACHMENT A <br /> REMEDIAL SYSTEM PERFORMANCE EVALUATION <br /> Soil vapor extraction (SVE) and air sparging were initiated on January 1, 1995 and <br /> May 5, 1995, respectively A brief description and performance evaluation of the remedial <br /> system between January 1 and March 31, 1998 is presented below <br /> The SVE system is comprised of 14 SVE wells (V-1 through V-13, and E-6) and a Airex <br /> Katox 100 catalytic oxidizer The SVE system is permitted by the San Joaquin County <br /> Unified Aar Pollution Control District (SJVUAPCD) Permit to Operate Number N-3601-1-0, <br /> for operation through January 1, 2000 <br /> SVE System <br /> The SVE system was not operated this quarter due to high groundwater elevations making <br /> operationof the SVE not feasible <br /> Historical SVE system operational and analytical data including hours of operation, applied <br /> vacuum, flow rate, ambient dilution status, field FID, influent TPH-g and benzene <br /> concentrations and mass removal data are presented in Table A-1 Emission data is presented <br /> in Table A-2 SVE wells data including open/closed status, vacuum, flow, and analytical data <br /> are presented as Table A-3 Graphical presentation of TPH-g and benzene mass removal and <br /> concentration data are shown on Figures A-1 and A-2 <br /> Air Sparging System <br /> The air sparging system was not operational this quarter Downtime was associated with an <br /> burned out motor on the air sparging blower Aar sparging system operational data including <br /> well open/closed status, flow rate and applied pressure data are presented in Table A-4 <br /> Dissolved oxygen data is presented in Table A-5 <br /> Conclusion <br /> SECOR will repair the air sparge blower and restart the air sparge system The SVE system <br /> will remain off until groundwater elevations decline to a point where SVE is feasible <br /> 7G600 019 01\1Q98 doe A - l June 30 1998 <br />