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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 October 1, 2004, and December 28, 2004, are presented below SVE System Overview The SVE system is comprised of 4 SVE wells(4 wells onlme VW-1B,VW-2B,VW-3B and VW-4)and two 2,000-1b 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) 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 Soil Vapor Extraction SVE system influent data is presented in Table A-i and a plot of soil vapor influent concentrations is shown as Figure A-1 SVE system performance data is included m 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 mimmum destruction efficiency requirements of 95% The system was shutdown on September 7,2004,due to excessive noise issues On November 30,2004,a sound enclosure was installed and the system was restarted The following data is for the fourth quarter,2004 o SVE operational uptime was 9 7%for the quarter This is due to the extended shutdown for noise issues o System average flow rate was 152 standard cubic feet per minute SJVAPCD authority to construct does not specify a maximum flow rate • Destruction efficiency was 100%, which complies with SJVAPCD permit requirement of 95%or greater • 30 4 pounds of gasoline were removed • 0 48 pounds of MtBE were removed • No benzene was removed due to non-detect influent concentrations Analytical Data Review Based on the review of the electronic and hardcopy data (chain-of-custody records, blanks, dilutions, holding times, LCSILCSD 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 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 isAttachment A-1 —Field Data Sheets and Laboratory Analytical Reports