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Updated Site Conceptual Model and First Quarter 2003 Monitoring and Remediation Report <br /> Cleanu and Abatement Order No 5-00-707 EAI Project No 1232 <br /> 4,0 REMEDIATION SYSTEM STATUS REPORT <br /> Due to low concentrations of VOCs observed in the extracted soil vapor during the fourth <br /> quarter 2002 quarterly system testing, the oxidizer was operated only 100 hours during the first <br /> quarter 2003 However, the air sparging compressor was operated for approximately 1,000 <br /> hours alternatively for one week on the Wards site and then one week on the Unocal site <br /> On March 18, 2003, the oxidizer was restarted to obtained VOC readings from individual vapor <br /> extraction wells using an OVA calibrated to methane and collect soil vapor samples for <br /> quarterly monitoring Soil vapor samples were obtained from the inlet of the oxidizer while <br /> operating separately on Ward and Unocal sites The samples were analyzed for TPH-G, <br /> BTEX, and MTBE by EPA Methods 8015M and 8021B, and for carbon dioxide, methane, and <br /> oxygen by ASTM-D 1946 The field measurement data are compiled in Table 5 <br /> The analytical data and chain of custody are presented in Appendix C <br /> The soil vapor sample obtained from the Montgomery site contained 0 3% carbon dioxide <br /> which indicates that hydrocarbons in the subsurface are still subjected to the biodegradation <br /> activity <br /> The soil vapor sample obtained from the Unocal's site contains 0 08 % carbon dioxide which is <br /> a significant reduction from the fourth quarter 2002 (Appendix C) <br /> As required by conditions of the air quality permit, quarterly sampling was performed on <br /> March 18, 2003 No analytes were detected above the detection limit (Appendix C) <br /> Since starting the remedial system, the thermal oxidizer has operated for a total of 6,075 hours <br /> and the sparging compressor for approximately 11,000 hours, removing approximately 8,456 <br /> pounds of petroleum hydrocarbons from impacted soil and ground water (see Table 7) The <br /> amount of biodegraded hydrocarbons is not included in this total and is difficult to calculate <br /> It is proposed in the second quarter 2003 to operate the thermal oxidizer alternately for one <br /> week using wells VEW-2, VEW-8, VEW-l0, VEW-12 on the Ward Site and one week using <br /> wells MW-19S, MW-23S, and MW-25S on the Unocal Site The air sparging compressor will <br /> be kept operating on a continuous basis <br /> BHM WORD 1232RO321 -7- ENVIRONMENTAL AUDIT; INC o <br />