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y/ r . Mr Travis Bryant Project 22605-10103 October 2, 1998 Page 3 The results of Iaboratory analyses indicated that TPHG, benzene, ethylbenzenc, and total xylenes were detected in wells MW-1 and MW-2 TPHG, benzene, ethylbenzene, and total xylenes were detected in well MW-1 at concentrations of 251 micrograms per liter (ug/L), 28 9 ug/L, 5 20 ug/L, and 6 27 ug/L, respectively TPHG, benzene, ethylbenzene, and total xylenes were detected in well MW-2 at concentrations of 210 ug/L, 3 61 ug/L, 7 76 ug/L, and 8 62 ug/L, respectively MTBE was below laboratory detection limits in wells MW-1 and MW-2, using USEPA Method 8020 All oxygenates were below laboratory detection limits using USEPA Method 8260, except in well MW-2 MTBE was detected at a concentration of 3 7 ug/L in well MW-2 by USEPA Method 8260 Results of laboratory analyses are presented in Tables 1 and 2 CONCLUSIONS The typical gradient near the intersection of Charter Way and Lincoln Street has generally been toward the northeast Groundwater elevations decreased 0 12 foot from the previous sampling event (May 1998) Results of this monitoring event indicate that concentrations • of dissolved gasoline hydrocarbons were generally consistent from the previous sampling events WORK PROPOSED FOR FOURTH QUARTER 1998 EMCON will continue to perform quarterly groundwater sampling on behalf of IBC The next sampling event is tentatively scheduled for November 1998 Groundwater samples will be collected from monitoring wells MW-1 and MW-2 and will be analyzed for TPHG, BTEX isomers, and MTBE using USEPA Modified Method DHS/LUFT and 8020, respectively, and for the oxygenates MTBE, tertiary butanol, DIPS, ETBE, and TAME, using USEPA Method 8260 • SADA UBCSTOCK OM3 48Vntt 1 Emcon Rev 0, 10/2/48