ARCHIVED REPORTS XR0000433 - Laserfiche WebLink

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ATTACHMENT A REMEDIAL SYSTEM PERFORMANCE EVALUATION Soil vapor extraction (SVE) and air sparging were initiated on January 1, 1995 and May 5, 1995, respectively A groundwater extraction system operated at the site between 1991 and 1996 A brief description and performance evaluation of the remedial system between September 27, 2000 and December 14, 2000 is presented below Field data, analytical reports, and chain-of-custody documentations are presented in Attachment A-A SVE System The SVE system is comprised of 14 SVE wells (V-1 through V-13, and E-6) and an Airex Katox 100 catalytic oxidizer The SVE system is permitted by the San Joaquin County Unified Air Pollution Control District (SJVUAPCD)Permit to Operate Number N-3601-1-0,which expires on January 1,2001 The SVE system was re-started on March 15, 2000 after being off due to high groundwater elevations making operation of the SVE system not feasible The SVE system was approximately 100 percent operational during the month of October, at which time the system was shut off due to low influent concentrations SVE system influent data is presented in Tables A-1 and A-2, and a plot of SVE system influent soil vapor TPHg, benzene, and MtBE concentrations versus time is shown as Figure A-2 A plot of cummulative mass removal data is presented in Figure A-1 During the fourth quarter of 2000, influent concentrations of TPHg, benzene and MWE were non detect Therefore,during the fourth quarter,the SVE system removed an undetermined mass of these hydrocarbons from the soil beneath the site SVE system performance data is included in Table A-1 SVE emission data is presented in Table A-3,and SVE operational data, including well open/closed status,flow rate, and applied vacuum data,are presented in Table A-4 Air Sparging System The air spargmg system is comprised of 9 air spargmg wells (S-1 through S-9) and a MD Pneumatics Model 3202 7 5-horsepower blower During the fourth quarter, the air spargmg system was fully operational Air spargmg system operational data, including well open/closed status, flow rate, and applied pressure data are presented in Table A-5 Monitoring well dissolved oxygen data is included with groundwater elevation and analytical data in Table 1 and Table A-6 Treatment system field data sheets are included as Attachment A-A