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TPHG (249 gallons) A cumulative amount of 4,582 pounds of TPHG has been removed since <br /> . commencing SVE activities (see Table 5) Figure 5 presents cumulative mass of TPHG removed versus <br /> time and TPHG extraction rate versus time <br /> Vapor extraction wells VW-10, VW-11 (adjacent to the former UST complex), and VW-4 (adjacent to <br /> pump Islands) are still contributing to influent soil vapor petroleum hydrocarbons concentrations EMCON <br /> will evaluate the cost-effectiveness of the remediation system and will continue SVE, if applicable In <br /> the interim of evaluating the system, EMCON will continue to operate, maintain, and optimize the <br /> remediation system <br /> Dissolved oxygen (DO) levels were measured using a down hole measuring device in the monitoring <br /> wells Based on the DO levels and TPHG concentrations, DO concentrations are relatively low within <br /> areas of high dissolved hydrocarbon concentrations and high within areas of low dissolved hydrocarbon <br /> concentrations, indicating biological activity within the plume The dissolved oxygen isoconcentration <br /> map is presented in Figure 6 <br /> ATTACHMENTS <br /> • Table 1 Groundwater Monitoring 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 Analytical Results of Air Samples <br /> • Table 5 Extraction and Emission Rates <br /> • Table 6 Vapor Extraction Well Status <br /> • Figure 1 Site Location Map <br /> • Figure 2 Generalized Site Plan <br />. • Figure 3 Groundwater Contour Map (May 19, 1997) <br /> • Figure 4 TPHG Concentration Vs Time <br /> • Figure 5 Extraction Rate and Cumulative Mass of TPHG Removed Vs Time <br /> • Figure 6 Dissolved Oxygen Isoconcentration Map <br /> • Appendix A Field Procedures <br /> • Appendix B Laboratory Analysis Reports for Groundwater Samples and Chain-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 /> SA(1N T30\080508051461 OCS-96\gb 2 <br />