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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 /> TPHG decreased to 64.1 pg/L, and benzene was below method detection limits in well MW-4, TPHG also <br /> decreased to 80.4 dug/l_ in well VW-3, and benzene, ethylbenzene, and total xylenes were below method <br /> reporting limits. The groundwater gradient and direction of groundwater flow (east) were generally <br /> consistent with the previous sampling events. Groundwater elevation increased 0.05 feet in wells MW-1, <br /> MW-2, MW-4, and VW-3, and decreased 0.02 feet in well MW-3 from the previous sampling event <br /> --' - (September 1999). - - - - <br /> Groundwater samples were analyzed for oxygenates tertiary butanol,MTBE, di-isopropyl ether, ethyl tertiary <br /> butyl ether, and tertiary amyl methyl ether (TAME) using USEPA Method 8260. MTBE was detected in <br /> wells MW-1, MW-2, MW-3; MW-4, and VW-3 at concentrations of 984 �tg/L, 6.66 µg/L, 2.64 [ug/L, 760 �tg/L, <br /> and 262 ttg/L, respectively. TAME was detected in wells MW-1, MW-4, and VW-3 at concentrations of 8.92 <br /> ttg/L,.6.56 µg/L, and 2.08 µg/L, respectively. All other oxygenates were below laboratory detection limits for <br /> all wells. <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 Analytical Summary (Fourth Quarter 1999) <br /> • Figure 3 Groundwater Elevation Contours (Fourth Quarter 1999) <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 /> CP:IN:1CamPk\DataWrchiveWco12186\Qtrly�21860499.DOC-98Vsg:1 IT Corporalioa <br /> 02/22/00 <br />