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Date July 24,2002 Quarter 2nd Quarter,2002 i APPENDIX A REMEDIAL SYSTEM PERFORMANCE EVALUATION The SVE/AS systems were initiated on January 4, 1996 and June 18, 1997, respectively A brief description and performance evaluation of the remedial system during Second Quarter, 2002 are presented below Certified laboratory analytical reports,chain-of-custody documentation,and field data sheets are included as Attachment A-A SVE System The SVE system is comprised of 11 SVE wells (VES-1 through VES-7, and ATR-3, ATR-4, ATR-5, and TEX-1) and a King Buck Hasstech 100-cfm catalytic oxidizer The SVE system is permitted by the San Joaquin County Unified Air Pollution Control District (SJCUAPCD) Permit to Operate Number N-3413-1-0, for operation through December 31,2005 The system remained off due to low influent concentrations To date, the SVE system has removed approximately 3,616 6 pounds of TPHG and 10 6 pounds of benzene from the soil and groundwater beneath the site Historical SVE system performance and analytical data are summarized in Tables A-1 through A-3 Graphical presentations of TPHG mass removal and influent concentration data are shown on Figures A-I and A-2 AS System The AS system is comprised of 11 AS wells (VES-1 through VES-7, S-1 through S-3, and SMW-1) and a Conde 7 5-hp sparge blower The AS system operated at an average infection pressure of 4 7 psi and an average flow rate of 62 cfm AS system operational data, including well openlclosed status, flow rate and applied pressure, are presented in Table A-4 Historical dissolved oxygen levels for site wells are presented in Table 1 of this report Conclusion Influent concentrations of TPHG and benzene continue to decline The AS system will continue to be operated during the third quarter,the SVE system will be pulsed,and then evaluated to determine if it will remain operational K U5 BP ARCOV020931Quan�)Y\2 QTR 02kr WMR do Page A-1