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i 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 Operation and Maintenance During first quarter 2006, Stratus conducted twelve site visits to verify the system operation, to optimize system performance, conduct routine maintenance, and to collect the required discharge samples 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 observed to be non-operational on January 24, 2006, due to low propane The system was re-started on the same day after a propane re-fill The SVE system was observed to be non-operational on February 14, 2006, due to the air pressure alarm Based on the hour meter readings for January 27 and February 14, 2006, the SVE system was likely shutdown on January 28, 2006 The SVE system was re-started on February 14, 2006, by adjusting the influent air flow rate The SVE system was again found to be non-operational on March 21, 2006, due to low propane Based on the hour meter readings for March 15 and 21, 2006, the SVE system was likely shutdown on March 20, 2006 The SVE system was re-started on March 23, 2006, after re-filling the propane tank During the first quarter 2006 (between December 21, 2005 and March 28, 2006), the SVE system operated for 1,884 9 hours with an average operational uptime efficiency of 82 percent The GRO and benzene concentrations in the influent air samples collected during first quarter 2006 were in the range of 6,000 to 15,000 Mg/M3 and 34 to 210 mg/m3, respectively The average system Influent airflow rate to the SVE system was observed at 292 67 cfm at an average applied vacuum of 100 49 inches of water column During the first quarter 2006 (between December 7, 2005 and March 1, 2006), approximately 37,843 82 pounds of GRO were extracted and abated by the SVE system A cumulative mass of approximately 77,507 47 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 (1st Quarter 2006) Figure 4 Groundwater Elevation Contour Map, Lower Water Bearing Zone (1st Quarter 2006) Figure 5 Groundwater Analytical Summary(First Quarter 2006) • 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 1Bp-Arco for URS161001Quarterly120061Arco 6100_1 Q06 doc STRATUS