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Rernedial activities at the site were initiated with a SVE system consisting of a 150 cfm Stealth Bobcat catalytic oxidizer (cat-ox) and was operated at the site between August 15, 2000 and August 15, 2002, under permit N-903-2-0 Due to low influent concentrations, the cat-ox system was replaced with a SVE System consisting of a 2 3 HP Fuji Blower and two 1,000 lbs vapor phase carbon units, which operated at the site between August 1, 2003 and March 12, 2004, under permit N-4887-1-0 The vapor phase carbon adsorption system was replaced with the currently operating Solleco 100 cfm electric cat-ox in October f 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 for a total of 2,124 hours and removed approximately 33 53 pounds of TPHG The tabulated summaries of peCformance of previously operated SVE systems are included in Appendix D SVE S stem O eration and Maintenance Stratus conducted eight site visits during the fourth quarter 2004 to construct, install and start-up the new Solleco 100 cfm SVE system, to conduct operation and maintenance of the SVE system, and to collect compliance samples Upon authorization from SJVAPCD, the Solleco 100 cfm SVE system was started on October 10, 2004, in the presence of SJVAPCD personnel The SVE system since the start-up has operated for approximately 1,561 hours at an average operational uptime of 99 5 percent The influent GRO concentrations fluctuated from 17,000 milligrams per cubic meter (Mg/M3) during the start-up (on October 20, 2004) to 56 mg/m3 at the end of fourth quarter 2004 (December 9, 2004) The s average influent airflow rate to the SVE system was observed at 69 61 cfm at an average applied vacuum of 26 40 inches of water column Figure 4 presents change in influent concentrations of GRO and the cumulative GRO mass removed as a result of soil vapor extraction During the fourth quarter 2004, approximately 569 33 pounds of GRO was extracted and abated by the SVE system As of December 9, 2004, a total of 4,073 29 pounds of TPHG has been removed from the subsurface beneath the site The 5� SVE system is operating as designed and is in compliance with the SJVAPCD permit requirements . 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 (Fourth Quarter 2004) • Figure 3 Groundwater Analytical Summary (Fourth Quarter 2004) • 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 K\USA Gasoiine10065\Qtrly\2004\USA_65_4Q04 DOC 5rRATU5