ARCHIVED REPORTS_XR0007996 - Laserfiche WebLink

Home Browse Search

Updated Site Conceptual Model and Third Quarter 2002 Monitoring and Remediation Report Cleanup and Abatement Order No 5-00-707 EAI Prosect No 1232 4.0 REMEDIATION SYSTEM STATUS REPORT Due to low concentrations of VOCs observed in the extracted soil vapor during the second quarter 2002 quarterly system testing, the oxidizer was operated only 88 hours during the third quarter 2002 However, the air spargnng compressor was operated for approximately 1300 hours alternatively for one week on the Wards site and then one week on the Unocal site The compressor operation was coordinated with the construction activities on the Ward site On September 28, 2002, the oxidizer was restarted to obtained VOC readings from individual vapor extraction wells using a PID All readings were near the detection limit with the exception of well VIEW-2 on Ward site which had a PID reading of 230 ppmv and well 25S on Unocal site which had a PID reading in excess of 1,000 ppmv On September 30, 2002, soil vapor samples were obtained from the inlet of the oxidizer while operating separately on Ward and Unocal sites The samples were analyzed for TPH-G, BTEX, and MTBE by EPA Methods 8015M and 802113, and for carbon dioxide, methane, and oxygen by ASTM-D 1946 The sample obtained from the Ward's wells contained a TPH-G concentration below the detection limit of 10 ppmv and benzene, toluene, and ethylbenzene below the detection limit of 0 1 ppmv, total xylenes of 0 37 ppmv, and MTBE below of detection limit of 0 5 ppmv The soil vapor contained 0 41% carbon dioxide which indicates that hydrocarbons in the subsurface are subjected to the biodegradation activity, and 19 90% oxygen which suggests aerobic conditions in the subsurface The sample obtained from the Unocal's wells contained TPH-G at 79 ppmv, benzene at 0 44 ppmv, toluene and ethylbenzene, total xylenes below the detection limit of 0 2, and MTBE at 3 1 ppmv (no confirmation testing by EPA Method 8260B was performed) The soil vapor contains 1 41% carbon dioxide which is three times higher than on Ward's site, and 19 70% oxygen The analytical data and chain of custody are presented in Appendix C As required by conditions of the air quality permit, quarterly sampling was performed on September 30, 2002 No analytes were detected above the detection limit (see Appendix C) Since starting the remedial system, the thermal oxidizer has operated for a total of 5,754 hours and the sparging compressor for 8,222 hours, removing approximately 8,454 pounds of petroleum hydrocarbons from impacted soil and ground water (see Tables 5 and 6) The amount of biodegraded hydrocarbons is not included in this total and is difficult to calculate BHM WORD t232Ro291 -7- ENVIRONMENTAL AUDIT, INC