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Updated Site Conceptual Model and First Quarter 2002 Monitoring and Remediation Report Cleanup and Abatement Order No 5-00-707 EAI Project No 1232 • 4.0 REMEDIATION SYSTEM STATUS REPORT 4.1 Remediation System Restart—Montgomery Site Only ' The remediation system was shut down on December 24, 2000, due to Wards filing bankruptcy On June 21, 2001, the remedial system was reactivated At the time the system was restarted, a soil vapor sample was taken from the inlet of the oxidizer The analytical result indicated that the concentration of TPH-G in the extracted soil vapor was below one ppmv (see Table 8) The lab report is presented in Appendix D Based on the results, the thermal oxidizer was shutdown The air compressor was left running in a " pulse" mode (3 ' days on, and 4 days off) to support aerobic biodegradation of dissolved hydrocarbons by indigenous microorganism The oxidizer was restarted on August 27, 2001 to obtain and analyze a soil vapor sample The analytical results indicated the TPH-G concentration of 74 ppmv or 306 gg/L (see Table 8 and Appendix D), which was too low to justify running the oxidizer Therefore, the oxidizer was shutdown On December 11, 2001, the oxidizer was restarted for inspection by the San Joaquin Valley Air ' Pollution Control District A soil vapor sample obtained at that time contained no TPH-G above the laboratory detection limit (Table 8 and Appendix D) The concentration of carbon dioxide was 0 22% which is approximately 10 times higher than atmospheric The oxidizer was shutdown after sampling 4.2 Trenching and Piping Installation on Unocal Site In January and February 2002, the following wells located on the Unocal site were connected to the remedial system located on the Wards site • Wells MW-19S and MW-25S were connected to the vapor extraction manifold • Wells MW-19D, MW-23S, and MW-25D, and AS-26 were connected to the air- sparging manifold Appendix E contains copies of the pem-lits issued for this work 4.3 Joint Wards and Unocal Remediation System Start-Up After connecting the Unocal wells to the remediation system the thermal oxidizer was restarted on February 20, 2002 The start-up proceeded in three steps as follows • Vapor extraction only (i e , the air compressor was not operated) After start-up, VOC readings were taken from vapor extraction well heads MW-19S and MW-25D using a ' photo-ionization detector (PID) The highest reading, 5,350 ppmv, was observed in well MW-19S (see Table 9) BFSM I212Rp231 -7- ENVIRONMENTAL AUDIT, INC�