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The groundwater flow direction was calculated to be towards the east at an average gradient of 0.0029 <br /> ft/ft. An eastward groundwater flow direction is consistent with previous quarters. The groundwater <br /> elevation has decreased approximately by 1 foot across the site since the previous sampling event (March <br /> 2001). <br /> A Delta technician conducted six site visits to optimize and maintain the SVE/AS system. The SVE <br /> system was found to be shutdown on 04/02/01 due to an inoperable blower. The system was restarted on <br /> 04/16/01 after replacing the blower. The system was found to be shutdown again on 04/29/01 due to <br /> blower failure. The system was restarted on 05/03/01 after replacing the blower again. Approximately <br /> 167.5 lbs of TPHG as gasoline was removed during the second quarter 2001, and a cumulative mass of <br /> 862.10 lbs since startup (09128100). The AS s stem w started on 06/18/01 as free product was not <br /> detected in well VW-5D for two consecutive weeks Delta will continue to monitor well VW-5D for free <br /> product. If free product is detected, the AS system will be shut down. Delta will optimize the operation of <br /> the SVE system by increasing flows, and therefore influent concentrations, by changing the vacuum and <br /> flows from the individual wells. The SVE system was in compliance with San Joaquin Valley Unified Air <br /> Pollution Control District permit to operate. <br /> ATTACHMENTS: <br /> • Table 1 Groundwater Monitoring Data <br /> • Table 2 Groundwater Analytical Results for Oxygenates and Additional Compounds <br /> • Table 3 Floating Product Monitoring Summary, Well VW-51D <br /> • Table 4 Operational Uptime Information of the Soil Vapor Extraction System <br /> • Table 5 Flow Rates and Analytical Results of Air Sample Analyses <br /> • Table 6 Extraction and Emission Rates <br /> • Figure 1 Site Topographic Map <br /> • Figure 2 Groundwater Elevation Contours, 2"d Quarter 2001 <br /> .' • Figure 3 Groundwater Analytical Summary 2`d Quarter 2001 <br /> • Figure 4 Influent Concentrations vs Time <br /> • Figure 5 Cumulative Mass Removed vs Time <br /> • Appendix A Field Data Sheets <br /> • Appendix B Sampling and Analysis Procedures <br /> • Appendix C Certified Analytical Reports and Chain-of-Custody Records <br /> CAIARC0105481QTRLY120011Arco-0548 2Q01Report.doc Delta <br /> 08/24/01 <br />