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Updated Site Conceptual Model and Second Quarter 2003 Momtoruig and Remediation Report <br /> Cleanup and Abatement Order No 5-00-707 EAI Proiect 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 and the first quarter 2003 quarterly system testing, the oxidizer was operated only <br />' 166 hours during the second quarter 2003 However, the air sparging compressor was operated <br /> for approximately 1,071 hours alternatively for one week on the Wards site and then one week <br /> on the Unocal site <br /> On April 21, 2003, the oxidizer was restarted to obtain VOC readings from individual vapor <br /> extraction wells (using an OVA calibrated to methane) and to collect soil vapor samples for <br /> quarterly monitoring The field measurement data are compiled in Tables 5 through 7 Soil <br /> vapor samples were obtained from the inlet of the oxidizer while being operated separately on <br /> both the Ward and Unocal sites The samples were analyzed for TPH-G using modified EPA <br /> Method 8015 and for BTEX and MTBE by EPA Method 8021B Only traces of toluene (0 18 <br /> ppmv) and total xylenes (0 37 ppmv) were detected in the extracted soil vapor The analytical <br /> data and chain of custody are presented in Appendix C Due to low concentration of <br /> hydrocarbons in the extracted soil vapor, no stack sampling was performed <br /> Since starting the remedial system, the thermal oxidizer has operated for a total of 6,234 hours <br /> and the spargmg compressor for approximately 12,000 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 /> EAI proposes to conduct field readings from individual wells and obtain soil vapor samples in <br /> the mid-July Based on the results of this testing, a decision will be made whether to operate <br /> the oxidizer The air sparging compressor will be kept operating on a continual basis <br /> i <br /> 13HM WORD 1232RO351 -6- ENVIRONMENTALAUDIT INC <br />