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45 <br /> TPHG (303 gallons) Figure 5 presents cumulative mass of TPHG removed versus time and TPHG <br /> extraction rate versus time EMCON will continue to operate, maintain, and optimize the remediation <br /> system <br /> The SVE system downtime was due to winter storms and high groundwater levels The system has been <br /> optimized during the March 20, 1997, site visit by closing wells with low petroleum hydrocarbon <br /> concentrations <br /> ATTACHMENTS <br /> • Table 1 Groundwater Monitonng Data <br /> • Table 2 Results of Additional Analyses of Groundwater Samples <br /> • Table 3 Operational Uptime Information of Soil Vapor Extraction System <br /> • Table 4 Flow Rates and Results of Air Sample Analyses <br /> • Table 5 Extraction and Emission Rates <br /> • Figure 1 Site Location Map <br /> • Figure 2 Generalized Site Plan <br /> • Figure 3 Groundwater Contour Map (February 24, 1997) <br /> • Figure 4 TPHG Concentration vs Time <br /> • Figure 5 Cumulative Mass and Extraction Rate of TPHG Removed vs Time <br /> • Appendix A Field Procedures <br /> • Appendix B Laboratory Analysis Reports for Groundwater Samples and Cham-of-Custody <br /> Records <br /> • Appendix C Field Data Sheets <br /> • Appendix D Laboratory Analysis Reports for Air Samples and Chain-of-Custody Records <br /> cc Elizabeth Thayer, California Regional Water Quality Control Board <br /> Kai Chen, San Joaquin Valley Unified Air Pollution Control Board <br /> SAO N IPJ010805108051461 OBS-961cjb L Rev 0 6112/97 <br />