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• DISCUSSION: Groundwater samples were analyzed for TPHG, BTEX, and the oxygenates tertiary butanol, MTBE, DIPS, ETBE, and TAME. .Results of this monitoring event indicated that dissolved gasoline hydrocarbons were generally consistent with previous monitoring events, with the following exceptions. TPHG and benzene concentrations decreased in well MW-1 to 81.7 micrograms per liter (jg/L) and 4.32 µg/L, respectively, and toluene, ethylbenzene and total xylenes were below method reporting limits: In addition, toluene was detected in well MW-2 at a concentration of 0.781 [.g/L. The groundwater gradient and direction of groundwater flow (north-northeast) were generally consistent with -the previous sampling events. Groundwater elevation increased 2.80 feet from the previous sampling event (December 1998). Groundwater samples were also analyzed for the oxygenates tertiary butanol, MTBE, di-isopropyl ether, ethyl tertiary butyl ether, and tertiary amyl methyl ether using USEPA Method 8260. MTBE was detected in wells MWA and MW-4 at concentrations of 3.92 µg/L and 7.86 µg/L, respectively. MTBE by USEPA Method 8260 was below laboratory detection limits for wells MW-2, MW-3, and VW-3. All other oxygenates were below laboratory detection limits for all wells. Assembly Bill 681 Notification (AB 681) This property is owned by Catherine R. Bevanda of P.O. Box 901297, Palmdale, California. The property owner receives copies of reports for this site. . ATTACHMENTS:' • Table 1 Groundwater Monitoring Data • Table 2 Groundwater Analytical Results for Oxygenates • Figure 1 Site Location Map • Figure 2 Groundwater Analytical Summary (First Quarter 1999) • Figure 3 Groundwater Elevation Contours (First Quarter 1999) • Appendix A Sampling and Analysis Procedures • Appendix B Laboratory Analysis Reports and Chain-of-Custody Records • Appendix C Field Data Sheets • CP\FAARC0121861Q1'RLY121860199.D0C-9811sg:1