ARCHIVED REPORTS XR0000432 - Laserfiche WebLink

Home Browse Search

0 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 December 14, 2000 and March 1, 2001 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 1,2002 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 system was shut-off in October of 2000 due to low influent concentrations and remained off through January 16, 2001 The system was again re-started and operated through March 1, 2001 The WE system was approximately 40 percent operational between January 16 and March 1, 2001, 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 cumulative mass removal data is presented m Figure A-1 During the first quarter of 2001, influent concentrations of TPHg, benzene and MtBE were non detect Therefore, during the first 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 to Table A-3, and SVE operational data, including well operi/ciosed status,flow rate, and applied vacuum data,are presented in Table A-4 Air Sparging System The air sparging system is comprised of 9 air sparging wells (S-1 through S-9) and a MD Pneumatics Model 3202 7 5-horsepower blower During the first quarter, the air sparging system was fully operational Air sparging 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