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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 April 1, 2005, and June 30, 2005, are presented below SVE System Overview The SVE system is comprised of 4 SVE wells (2 wells online VW-1$ and VW-2B, and 2 wells offline VW-3B and VW4) 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 To date, a Permit to Operate has not been received 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 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 second quarter 2005 • SVE operational uptime was 80 3%for the quarter • System average flow rate was 123 standard cubic feet per rrunute 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 • 439 0 pounds of gasoline were removed • 0 00 pounds of benzene were removed • 0 84 pounds of MtBE were removed • A carbon change out was performed on the pnmary carbon vessel on April 4,2005 The secondary vessel was moved to the primary positron A second carbon change out was performed on the primary vessel (previously the secondary vessel) on May 20,2005 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 limitations • The reported results for the 8260B analysis of the influent and midpoint air samples collected on April 11, 2005 (02186AINF-041105 and 02186AMID-041105)may be biased low since the analyses for these analytes were performed beyond the U S EPA recommended holding time . • The reported results for the 8260E analysis of the influent air sample collected on May 12, 2005(02186AINF- 051205)may be biased low since the analyses for these analytes were performed beyond the U S EPA recommended holding time