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DISCUSSION <br /> Results of the third quarter 2000 groundwater monitoring event indicate that the concentrations of <br /> dissolved hydrocarbons are generally consistent with previous sampling events MTBE was detected in <br /> the samples collected from monitoring wells MW-1, MW-3 and MW-4 at concentrations of 4,500 µg/L, <br /> 4 98 WL, and 6,590 µg/L, respectively The shallow vapor extraction wells, VW-1 through VW-3, were <br /> scheduled to be sampled, however groundwater was not present in the wells at the time of sampling <br /> The groundwater gradient and direction of groundwater flow (east-northeast) were generally consistent <br /> with the previous sampling events Groundwater elevations decreased approximately five feet in wells <br /> MW-1, MW-2, MW-3, MW-4, and VW-3 since the previous sampling event (June 2000) <br /> A soil vapor extraction (SVE) test was conducted on September 18 and 19, 2000 to evaluate the technical <br /> feasibility of SVE as a remedial alternative Three SVE tests, each of approximately four hours duration, <br /> were conducted on shallow vapor extraction wells VW-1A, VW-2A and VW-3A Influent soil vapor <br /> samples were collected during the tests and analyzed for the presence of petroleum hydrocarbons The <br /> analytical results of air samples along with applied vacuum and resultant flow data will be used to evaluate <br /> the feasibility of SVE as a remedial alternative <br /> ATTACHMENTS <br /> • Table 1 Groundwater Monitoring Data <br /> • Table 2 Groundwater Analytical Results for Oxygenates <br /> • Figure 1 Site Location Map <br /> • Figure 2 Groundwater Elevation Contours (Third Quarter 2000) <br /> • Figure 3 Groundwater Analytical Summary (Third Quarter 2000) <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 /> PAVILION\MyDocumentslARC0121861QTRLY1200012186Q300 Delta <br /> 11/30/00 <br />