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s <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 June 29, 2000 and September <br /> 29,2000 are presented below <br /> SVE System <br /> The SVE system is comprised of 11 SVE wells (VES-I 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 during the second and third quarters and <br /> . will be pulsed during the fourth quarter of 2000 During the months of scheduled operation, the SVE system <br /> was 100% operational this quarter During this period, the SVE system removed approximately 100 93 pounds <br /> of TPHg and 1 16 pounds of benzene To date, the SVE system has removed approximately 3,621 5 pounds of <br /> TPHg and 10 5 pounds of benzene from the soil and groundwater beneath the site Historical SVE system <br /> performance and analytical data are summarized in Tables A-1 and A-3 Graphical presentations of TPHg mass <br /> 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 The air spargmg system operated at an average injection <br /> pressure of 4 7 psi and an average flow rate of 21 1 cfm Air spargmg 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 weIIs 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 Ermssion Data <br /> Table A-3 - Soil Vapor Extraction System Well Data <br /> Table 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 Analytical Reports,Chain of Custody Documentation,and <br /> Remedial System Field Data Sheets <br />