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2004 The 150 cfm Stealth Bobcat SVE system operated at the site for a total of 13,624 hours and removed approximately 3,467 pounds of TPHG and the carbon adsorption system has operated at the site ifor a total of 2,124 hours and removed approximately 33 53 pounds of TPHG The tabulated summaries Of performance of previously operated SVE systems are included in Appendix D SVE System Operation and Maintenance Stratus conducted seven site visits during the first quarter 2005 to conduct operation and maintenance of the SVE system, and to collect compliance samples During the first quarter 2005, the SVE system has operated for approximately 1,803 9 hours at an average operational uptime of 93 9 percent The influent TPHG concentrations fluctuated from less than 50 mglm at the beginning of the quarter (January 13, 2005) to 40 Mg/M3 at the end of first quarter 2005 (March 3, 2005) The average Influent airflow rate to the SVE system was observed at 85 35 cfm at an average applied vacuum of 68 inches of water column Figure 4 presents change in Influent concentrations of TPHG and the cumulative TPHG mass removed as a result of soil vapor extraction During the first quarter 2005, approximately 40 83 pounds of TPHG was extracted and abated by the SVE system As of March 3, 2004, a total of 4,114 12 pounds of TPHG has been removed from the subsurface beneath the site The SVE system is operating as designed and is in compliance with the SJVAPCD permit requirements Due to low influent petroleum hydrocarbon concentrations in the extracted sod vapor stream and high energy costs, Stratus will operate the SVE system in pulse mode The SVE system will be operated for 15-days per month beginning second quarter 2005 ATTACHMENTS • Table 1 Groundwater Elevation and Analytical Summary • Table 2 Groundwater Analytical Results for Oxygenates • Table 3 Operational Uptime and Flow Rate • Table 4 Flow Rates and Analytical Results of Air Sample Analysis Table 5 Extraction and Emission Rates • Figure 1 Site Location Map • Figure 2 Groundwater Elevation Contour Map (First Quarter 2005) • Figure 3 Groundwater Analytical Summary (First Quarter 2005) • Figure 4 Cumulative Mass Removed and Concentrations of TPHG Vs Time • Appendix A Field Data Sheets • Appendix B Sampling and Analysis Procedures • Appendix C Certified Analytical Reports and Chain-of-Custody Documentation • Appendix D Performance Summaries for Previous SVE Systems • 05 DOC STWATU5 K IDSA Gaso1me100651Qtr1y120051USA_65_I Q