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DISCUSSION <br /> Groundwater samples were analyzed for TPHG, BTEX, and oxygenates Results of this monitoring event <br /> indicated that dissolved gasoline hydrocarbons were generally consistent with previous monitoring events <br /> for wells MW-1, MW-2, and MW-3 TPHG, MTBE, and TAME (232 µg/L, 2070 fig&, and 15 7�ig/L, <br /> respectively) were detected above historical high levels for MW-4 In addition, samples tested from VW-3 <br /> also indicated concentrations higher than historical levels, for all constituents previously detected <br /> Groundwater samples were analyzed for oxygenates including tent-butyl-alcohol, MTBE, di-isopropyl ether, <br /> ethyl tertiary butyl ether, and tertiary amyl methyl ether (TAME) using USEPA Method 8260 MTBE was <br /> detected in wells MW-1, MW-4, and VW-3 at concentrations of 114 ug/L, 2070 }LgIL, and 3180 µg/L, <br /> respectively TAME was detected in wells MW-4, and VW-3 at concentrations of 15 7 µg/l- and 23 µg/L, <br /> respectively All other oxygenates were below laboratory detection limits for all wells <br /> The groundwater gradient and direction of groundwater flow (east) were generally consistent with the <br /> previous sampling events Groundwater elevation decreased less than 22 feet in wells MW-1, MW-2, MW- <br /> 4, and VW-3, and increased 0 005 feet in well MW-3 from the previous sampling event (April 3, 2000) <br /> A workplan to further assess the extent of hydrocarbons and to conduct a Soil Vapor Extraction (SVE) test <br /> was submitted in July 2000 The SVE test is scheduled for September 2000 Once access to the City <br /> property (Oak Park) has been obtained, drilling activities will be scheduled <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 (Second Quarter 2000) <br /> • Figure 3 Groundwater Analytical Summary (Second Quarter 2000) <br /> • Appendix A Sampling and Analysis Procedures <br /> • Appendix B Laboratory Analysis Reports and Chain-of-Custody Records <br /> • Appendix C Field Data Sheets <br /> I <br /> C 1ARC0121 WQTRLY1200012186Q200 doe Delta <br /> 09/19/00 <br />