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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 bnef description and performance evaluation of the remedial systems between January 1, 2005, and March 31,2005, are presented below SVE System Overview The SVE system is comprised of 4 SVE wells(4 wells online VW-1B,VW-2B,VW-3B and VW4)and two 2,000-1b granular activated carbon (GAC) vessels in senes as the primary treatment process for the SVE system. The SVE system is permitted by the San Joaquin Valley Air Pollution Control Distract (SJVAPCD) Authority to Construct Permit#N-5083-1-0 for operation until the Permit to Operate is issued by SJVAPCD Initial sampling and flow data was submitted to SJVAPCD on September 28,2004 To date, a Permit to Operate has not been received 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 AA 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 destruction efficiency for this quarter averaged to 100%,which complies with the SJVAPCD permit numnium destruction efficiency requirements of 95% The following data is for the fust quarter 2005 • O SVE operational uptime was 75 0%for the quarter C System average flow rate was 124 standard cubic feet per minute SJVAPCD authority to construct does not specify a maximum flow rate • Destruction efficiency was 100°/x,which complies with SJVAPCD permit requirement of 95%or greater • 369 6 pounds of gasoline were removed • 0 09 pounds of benzene were removed • 2 94 pounds of MtBE were removed • An error was found in the calculation for the mass removal in Table A-1 The error was corrected for all lustorical data,resulting in revised total mass removed for GRO,benzene and MtBE 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 without limitations Attachments Table A-1 - Soil Vapor Extraction System Performance Data Table A-2 - Soil Vapor Extraction System Errussion 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