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• Analytical data from samples collected on November 4, 2004 Indicated Inadequate destruction efficiency The SVE unit 2 was re-started on November 11, 2004, to troubleshoot for low destruction efficiency and air samples were collected after operating the system for approximately one hour The analytical results of the air samples collected on November 11, 2004, Indicated compliance with SJVAPCD permit requirements The SVE unit 2 was not re-started due to the proposed replacement of both units 1 and 2 by a 500 cfm Solleco thermal oxidizer During the fourth quarter 2004, the influent GRO concentrations to SVE unit 2 fluctuated in the ranges of 1,000 to 2,200 milligrams per cubic meter(mg/m) The average soil vapor extraction flow rates (including the dilution air) for SVE unit 2 were observed to be at 227 73 cfm at an average applied vacuum of 11 80 inches of water column During the fourth quarter 2004, approximately 1,000 9 pounds of GRO were extracted and abated by the SVE unit 2 Influent GRO and cumulative GRO mass removed from both SVE units 1 and 2 are presented in Figures 6 and 7 Since the system start-up, a cumulative mass of 9,625 pounds of GRO has been removed from the subsurface beneath the site by both the units 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-- Unit 1 (SL No 9321) • Table 7 Flow Rates and Analytical Results of Air Sample Analyses—Unit 2 (SL No 9230) • Table 8 Operational Uptime and Flow Rate For Soil Vapor and Extraction System Unit 1 (SL No 9321) • • Table 9 Operational Uptime and Flow Rate For Soil Vapor and Extraction System Unit 2 (SL No 9230) • Table 10 Extraction and Emission Rates— Unit 1 (SL No 9321) • Table 11 Extraction and Emission Rates—Unit 2 (SL No 9230) • Figure 1 Site Location Map • Figure 2 Site Plan • Figure 3 Groundwater Elevation Contour Map, Upper Water Bearing Zone (4th Quarter 2004) • Figure 4 Groundwater Elevation Contour Map, Lower Water Bearing Zone (4th Quarter 2004) • Figure 5 Groundwater Analytical Summary (Fourth Quarter 2004) • Figure 6 Influent GRO and Cumulative GRO Mass Removed Over Time—SVE Unit 1 • Figure 7 Influent GRO and Cumulative GRO Mass Removed Over Time—SVE Unit 2 • Appendix A Field Data Sheets • Appendix B Sampling and Analysis Procedures • Appendix C Certified Analytical Reports with Chain-of-Custody Documentation and EDF Verification • K\Bp-Arco for URS\6100\Quarterly\2004\Arco_6100_4Q04 doe STRA7U5