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Date October 29,2003 Quarter 3`d Quarter,2003 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 the third quarter,2003 are presented below SVE System The SVE system has been shut down since June 2001 The SVE system is comprised of 11 SVE wells (VES-1 through VES-7, 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 Umfied 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 Historic 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-I through S-3, and SMW-1) and a Conde 7 5-hp sparge blower AS system operational data,including well open/closed status, flow rate and applied pressure, are presented in Table A-4 Historic dissolved oxygen levels for site wells are presented in Table I of this report Conclusion The AS system was restarted in January 2003,the SVE system remains off Attachments Table A-I - Soil Vapor Extraction System Performance Data Table A-2 - Soil Vapor Extraction Enussion Data Table A-3 - Soil Vapor Extraction System Well Data Table A-4 - Air Sparging System Well Data Figure A-1 - Soil Vapor Extraction Mass Removal Trend Figure A-2- Soil Vapor Extraction System Hydrocarbon Concentrations Remedial System Field Data Sheets