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0 <br /> ATTACHMENT A <br /> REMEDIAL SYSTEM PERFORMANCE EVALUATION <br /> Soil vapor extraction(SVE) and air sparging were initiated on January 4, 1996 and June 18, 1997, respectively <br /> A brief description and performance evaluation of the remedial system between September 29, 2000 and <br /> December 18, 2000 are presented below Field data sheets, chain-of-custody documentation, and laboratory <br /> reports are concluded as Attachment A-A <br /> SVE System <br /> The SVE system is comprised of 11 SVE wells (VES-1 through VES-7, and ATR-3,ATR-4,ATR-5, and TEX- <br /> 1) and a King Buck Hasstech 100 cfm catalytic oxidizer The SVE system is permitted by the San Joaquin <br /> County Unified Air Pollution Control District (SJVUAPCD) Permit to Operate Number N-3413-1-0, for <br /> operation through January 1,2002 <br /> Due to relatively low influent concentrations, the SVE/AS was pulsed between the second and fourth quarters <br /> and will be pulsed during the first quarter of 2001 During the months of scheduled operation, the SVE system <br /> was 100% operational this quarter During this period, the SVE system removed approximately 11 9 pounds of <br /> TPHg No detectible concentrations of benzene were reported, therefore, the sytem removed an undetermined <br /> amount of benzene this quarter To date, the SVE system has removed approximately 3,611 9 pounds of TPHg <br /> and 10 6 pounds of benzene from the soil and groundwater beneath the site Historical SVE system performance <br /> and analytical data are summarized in Tables A-1 through A-3 Graphical presentations of TPHg mass removal <br /> and influent concentration data are shown on Figures A-1 and A-2 <br /> Air Sparging System <br /> The air sparge system is comprised of 11 air sparge wells (VES-1 through VES-7, S-1 through S-3, and SMW- <br /> 1) and a Conde 7 5-horsepower sparge blower The air sparging system operated at an average infection <br /> pressure of 3 9 psi and an average flow rate of 21 6 cfm Air sparging system operational data, including well <br /> open/closed status, flow rate and applied pressure, data are presented in Table A-4 Dissolved oxygen levels for <br /> site wells are presented in Table 1 of this report <br /> Attachments Table A-1 - Soil Vapor Extraction System Performance Data <br /> Table A-2 - Soil Vapor Extraction System Emission Data <br /> Table A-3 - Soil Vapor Extraction System Well Data <br /> fable A-4 - Air Sparging System Well Data <br /> Figure A-1- Soil Vapor Extraction System Mass Removal Trend <br /> Figure A-2- Soil Vapor Extraction System Hydrocarbon Concentrations <br /> Attachment A-A - Certified Laboratory Analytical Reports,Chain of Custody <br /> Documentation and Remedial System Field Data Sheet% <br />