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(tiY <br /> (see Table 4) Figures 4 and 5 present the rate of TPHG concentration over time and extraction rate and <br /> cumulative mass of TPHG removed over time, respectively EMCON is currently pulsing the SVE <br /> system due to low hydrocarbon extraction rates <br /> Air sparging was initiated on September 5, 1996, and continued through the third quarter 1997 Air <br /> sparge flow rates and DO concentrations are presented in Table 5 EMCON will continue to monitor the <br /> effects of air sparging during the fourth quarter 1997 when the system is being pulsed The DO readings <br /> were measured in the groundwater monitoring wells <br /> ATTACHMENTS <br /> • Table 1 Groundwater Monitoring Data <br /> • Table 2 Operational Uptime Information of the Soil Vapor Extraction System <br /> • Table 3 Flow Rates and Results of Air Sample Analyses <br /> • Table 4 Extraction and Emission Rates <br /> • Table 5 Air Sparge Flow Rates and Dissolved Oxygen Levels <br /> • Figure 1 Site Location Map <br /> • Figure 2 Generalized Site Plan <br /> • Figure 3 Groundwater Contour Map (August 19, 1997) <br /> • Figure 4 TPHG Concentration Vs Time <br /> • Figure 5 Extraction Rate and Cumulative Mass of TPHG Removed Vs Time <br /> • Appendix A Sampling and Analysis Procedures <br /> • Appendix B Chain-of-Custody Records and Laboratory Analysis Records <br /> • Appendix C Field Data Sheets <br /> cc Elizabeth Thayer, California Regional Water Quality Control Board <br /> Bruce Tuter, San Joaquin Valley Unified Air Pollution Control District <br /> i <br /> SACS\PJM805S0805 L 140 8C3-97,cbell 1 <br />