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• Operation and Maintenance During fourth quarter 2005, Stratus conducted six site visits to re-start the SVE system after blower replacement, conduct routine operation and maintenance, and to collect the required discharge samples Since the influent petroleum hydrocarbon concentrations (measured using PID) from well MW-2 were relatively low (18 6 parts per million by volume on August 16, 2005), this well was disconnected and well MW-4 was connected for soil vapor extraction on August 22, 2005 Currently the SVE system is set-up to extract soil vapors from wells VW-1, VW-3, VW-4, VW-8, VW-14, MW-4, MW-8, and MW-9 The SVE system was shutdown on September 19, 2005, due to a blower malfunction The blower was removed and shipped to the manufactuer for testing and replacement under warranty The SVE system was re-started on December 7, 2005, after replacing the liquid ring blower The SVE system was again found non-operational on December 8, 2005, probably due to a motor-starter malfunction The SVE system was re-started on December 8, 2005, by re-setting the motor starter and the remediation system appears to be functioning normally since then During the fourth quarter 2005, the SVE system operated for 283 6 hours between September 19, 2005 and December 21, 2005, with an average operational uptime efficiency of 54 percent The influent GRO , and benzene concentratsons in the air sample collected on December 7, 2005 were at 9,100 mg/m3 and 77 mg/m3, respectively The average system influent airflow rate to the SVE system was observed at 236 35 cfm at an average applied vacuum of 69 04 inches of water column During the fourth quarter 2005 (between September 19, 2005 and December 7, 2005), approximately 6,177 98 pounds of GRO were extracted and abated by the SVE system A cumulative mass of approximately 39,663 65 lbs (Figure 6) of GRO has been removed from the subsurface by both the two 200 cfm (previously operated) and the current 500 cfm SVE systems The SVE system is operating as designed and is in compliance with the SJVPACD permit requirements ATTACHMENTS • Table 1 Product Monitoring and Removal Summary • Table 2 Groundwater Level Data • Table 3 Groundwater Analytical Summary • Table 4 Groundwater Analytical Results for Oxygenates and Additional Compounds • Table 5 Summary of Wells • Table 6 Flow Rates and Analytical Results of Air Sample Analyses • Table 7 Operational Uptime and Flow Rate for SVE System • Table 8 Extraction and Emission Rates • Figure 1 Site Location Map • Figure 2 Site Plan • Figure 3 Groundwater Elevation Contour Map, Upper Water Bearing Zone (4th Quarter 2005) • Figure 4 Groundwater Elevation Contour Map, Lower Water Bearing Zone (4th Quarter 2005) • Figure 5 Groundwater Analytical Summary (Fourth Quarter 2005) • Figure 6 Influent GRO Concentrations in Soil Vapors and Cumulative GRO Mass Removed Over Time • Appendix A Field Data Sheets • Appendix B Sampling and Analysis Procedures • Appendix C Certified Analytical Reports with Chain-of-Custody Documentation and EDF Verification • Appendix D Performance and Operation Summary of King, Buck, &Associates SVE Systems K\Bp-Arco for URS161001Quarterly120051Arco_6100 4Q05 doc STRATUS