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Date: January 28,2004 Quarter: 4`h Quarter,2003 APPENDIX A REMEDIAL SYSTEM PERFORMANCE EVALUATION The SVEIAS systems were initiated on January 4, 1996 and June 18, 1997, respectively A brief description and performance evaluation of the remedial system during the fourth 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 Unified Air Pollution Control District(SJCUAPCD) Perriut 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-1 through S-3, and SMW-1) and a Conde 7 5-hp sparge blower The air sparge (AS) system operated from January 22, 2003 through the end of the fourth quarter, 2003, however no samples were collected in the fourth quarter, 2003 Historical AS system operational data,including well open/closed status, flow rate and applied pressure, are presented in Table A-4 Attachments Table A-I - Soil Vapor Extraction System Performance Data Table A-2 - Soil Vapor Extraction Emission Data Table A-3 - Soil Vapor Extraction System Well Data Table A-4 - Air Sparging System Well Data Figure A-I - Soil Vapor Extraction Mass Removal Trend Figure A-2- Soil Vapor Extraction System Hydrocarbon Concentrations Remedial System Field Data Sheets J SBP ARCOWe[n s ReslStanon No 0209314QMR03WQ03 O&MU093 O&M 4Q03 do