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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 March 15,2001 and June 25, <br /> 2001 are presented below Field data sheets, chain-of-custody documentation, and laboratory reports are <br /> included 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 (SJCUAPCD) Permit to Operate Number N-3413-1-0, for <br /> operation through January 1,2002 <br /> During the months of scheduled operation, the SVE system was 49% operational this quarter During this <br /> period, the SVE system removed approximately 2 4 pounds of TPHg Benzene concentrations were mostly <br /> nondetectable, therefore, the system removed an undetermined amount of benzene this quarter To date, the <br /> SVE system has removed approximately 3,616 6 pounds of TPI-Ig and 10 6 pounds of benzene from the soil and <br /> groundwater beneath the site Historical SVE system performance and analytical data are summarized in Tables <br /> A-1 through A-3 Graphical presentations of TPI-Ig mass removal and influent concentration data are shown on <br /> Figures A-1 and A-2 <br /> Air Sparging System <br /> The au sparging system is comprised of I1 air sparging wells (VES-1 through VES-7, S-1 through S-3, and <br /> SMW-1) and a Conde 7 5-hp sparge blower The air sparging system operated at an average injection pressure <br /> of 4 0 psi and an average flow rate of 6 3 cfm Air sparging system operational data, including well open/closed <br /> status, flow rate and applied pressure, are presented in Table A-4 Historical dissolved oxygen levels for site <br /> wells are presented in Table 1 of this report <br /> Conclusion <br /> Influent concentrations of TPHg and benzene continue to decline The remedial system will continue to be <br /> pulsed during the third quarter, and then evaluated to determine if it will remain operational <br /> Attachments Table A-I - 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 /> Table A-4 - Air Sparging System Well Data <br />