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activities (see Table 5) Figure 5 presents cumulative mass of TPHG removed versus time and TPHG • extraction rate versus time Vapor extraction wells VW-10, VW-11 (adjacent to the former underground storage tank complex), and VW-12 (adjacent to pump islands) are still contributing to influent sod vapor petroleum hydrocarbons concentrations EMCON, on behalf of ARCO, will continue to operate, maintain, and optimize the remediation system The system was shut down for 2 weeks in the third quarter to adjust the catalyst in the oxidizer to improve system destruction efficiency Monitoring data indicates that benzene is declining in influent vapor concentrations,therefore, EMCON will evaluate suspending vadose remediation Dissolved oxygen (DO) levels were measured using a down hole measuring device in the monitoring wells DO levels are consistent throughout the site and ranged from 0 52 milligrams per liter (mg/L) to 0 79 mg/L ATTACHMENTS • Table 1 Groundwater Monitoring Data • Table 2 Results of Additional Analyses of Groundwater Samples • Table 3 Operational Uptime Information of Soil Vapor Extraction System • Table 4 Flow Rates and Analytical Results of Air Samples • Table 5 Extraction and Emission Rates • Table 6 Vapor Extraction Well Status • Figure 1 Site Location Map • Figure 2 Generalized Site Plan • Figure 3 Groundwater Contour Map (August 21, 1997) • Figure 4 TPHG Concentration Vs Time • Figure 5 Extraction Rate and Cumulative Mass of TPHG Removed Vs Time C Appendix A Field Procedures • Appendix B Laboratory Analysis Reports for Groundwater Samples and Chain-of-Custody Records • Appendix C Field Data Sheets • Appendix D Laboratory Analysis Reports for Air Samples and Chain-of-Custody Records cc Elizabeth Thayer, California Regional Water Quality Control Board Kai Chen, San Joaquin Valley Unified Air Pollution Control Board • SACNN\Pd0N0805\08051461 ODS-97\chell 1