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APPENDIX A SITE 2186 REMEDIAL SYSTEM PERFORMANCE EVALUATION The Soil Vapor Extraction(SVE)system was initiated on August 30,2004 The SVE system treats soil vapors A brief description and performance evaluation of the remedial systems between July 1, 2005 and September 30, 2005, are presented below SVE System Overview The SVE system is comprised of 4 SVE wells(4 wells online VW-1B,VW-213,VW-313 and VW-4)and two 2,000-Ib granular activated carbon (GAC) vessels in series as the primary treatment process for the SVE system The SVE system is permitted by the San Joaquin Valley Air Pollution Control District(SJVAPCD)Permit to Operate #N-5083 for operation through August 2009 Soil Vapor Extraction SVE system influent data is presented in Table A-1 and a plot of soil vapor influent concentrations is shown as Figure A-1 SVE system performance data is included in Tables A-1, A-2 and A-3 and extraction well data is presented in Table A-4 The following data is for the third quarter 2005 • SVE operational uptime was 99 7%for the quarter • o System average flow rate was 100 standard cubic feet per minute SJVAPCD permit to operate does not specify a maximum flow rate • Destruction efficiency was 100%,which complies with SJVAPCD permit requirement of 95%or greater • 196 9 pounds of gasoline were removed • 0 00 pounds of benzene were removed • 0 00 pounds of MtBE were removed Analytical Data Review Based on the review of the electronic and hardcopy data (chain-of-custody records, blanks, dilutions, holding times, LCS/LCSD results, MS/MSD results, and surrogate recoveries), the data are acceptable as reported by the laboratory with the following Iimitations • The reported results for the 8260B analysis of the influent,midpoint and effluent air samples collected on September 8,2005 (02186AINF-090805,02186AMID-090805 and 02186AEFF-090805)may be biased low since the analyses for these analytes were performed beyond the U S EPA recommended holding time Attachments Table A-1 - Soil Vapor Extraction System Performance Data Table A-2 - Soil Vapor Extraction System Emission Data Table A-3 - Operational Uptime of Soil Vapor Extraction System Table A-4 - Soil Vapor Extraction Well Status Data Figure A-1- Soil Vapor Extraction System Mass Removal Trend Figure A-2- Soil Vapor Extraction System Influent Concentrations Attachment A-1 —Field Data Sheets and Laboratory Analytical Reports