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i SVE System Operation and Maintenance . Due to low influent petroleum hydrocarbon concentrations in the extracted soil vapor stream during the first quarter 2005, Stratus operated the SVE system in pulse mode beginning second quarter 2005. Stratus conducted seven site visits during the fourth quarter 2005 to operate the system in pulse mode and to collect compliance samples. During the fourth quarter 2005, the SVE system has operated for approximately 1,445 hours. Petroleum hydrocarbons or fuel oxygenates were not reported in any of the influent and effluent air samples collected during October and November 2005. TPHG was reported at 310 mg/m3 in the influent air sample collected on December 7, 2005. The average influent airflow rate to the SVE system was observed at 76.59 cfm at an average applied vacuum of 22 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. As of December 7, 2005, a total of 4,110.46 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. 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 2005) • Figure 3 Groundwater Analytical Summary (Fourth Quarter 2005) • Figure 4 Cumulative Mass Removed and Concentrations of TPHG Vs Time • Appendix A Field Data Sheets • Appendix S Sampling and Analysis Procedures • Appendix C Certified Analytical Reports and Chain-of-Custody Documentation j i • KAUSA Gasolincl0065%Qtr1y120051USA_65_4QOS.DOC STRATUS