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• <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, <br /> respectively A brief description and performance evaluation of the remedial system between October 12, <br /> 1998 and December 21,1998 is presented below <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 <br /> TEX-1) and a King Buck Hasstech 100 cfm catalytic oxidizer The SVE system is permitted by the San <br /> Joaquin County Umfied Air Pollution Control District (SJVUAPCD) Permit to Operate Number N-3413-1-0, <br /> for operation through January 1, 2002 <br /> The SVE system was approximately 15 % operational this quarter Down time was associated with <br /> replumbmg of SVE and AS piping and a power failure and blown fuse in the PG&E transformer To date,the <br /> SVE system has removed approximately 3,134 pounds of TPH-g from the soil and groundwater beneath the <br /> site Histoncal SVE system performance and analytical data is summarized in Tables A-1 and A-2 Graphical <br /> presentations of TPH-g mass removal 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 <br /> The air sparging system operated at an average infection pressure of 7 psi and an average flow rate of 5 5 cfm <br /> Air sparging system operational data including well open/closed status, flow rate and applied pressure data are <br /> presented in Table A-3 Dissolved oxygen levels for site wells is presented in Table A-4 <br /> Attachments Table A-1 - Soil Vapor Extraction System Performance Data <br /> Table A-2 - Soil Vapor Extraction Emission Data <br /> Table A-3 - Air Sparging System Well Data <br /> Table A-4 - Dissolved Oxygen Well Concentrations <br /> Figure A-1 - Soil Vapor Extraction System Removal Trend <br /> Figure A-2 - Soil Vapor Extraction System Hydrocarbon Concentrations <br /> Attachment A-A - Remedial System Field Data Sheets <br /> 7G600-026-0114Q98 doe A-] March 8,1999 <br />