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Mr Travis Bryant Project 22605-10103 <br /> August 18, 1998 <br /> Page 3 <br /> The results of Iaboratory analyses indicated that TPHG, benzene, ethylbenzene, and total <br /> xylenes were detected in well MW-1 at concentrations of 1,050 micrograms per liter(ug/L), <br /> 325 ug/L, 29 1 ug/L, and 63 9 ug/L, respectively Dissolved hydrocarbons were below <br /> Iaboratory detection limits in well MW-2 The results of laboratory analyses for the <br /> oxygenates MTBE (using both USEPA Methods 8020 and 8260), tertiary butanol, DIPE, <br /> ETBE, and TAME were all below laboratory detection Iimits Results of laboratory <br /> analyses are presented in Tables 1 and 2 <br /> CONCLUSIONS <br /> The typical gradient near the intersection of Charter Way and Lincoln Street has generally <br /> been toward the northeast Groundwater elevations increased 2 96 feet from the previous <br /> sampling event (February 1998) Results of this monitoring event indicate that <br /> concentrations of dissolved gasoline hydrocarbons were generally consistent in well MW-1 <br /> and decreased to non-detect levels in well MW-2 from the previous sampling event <br /> • WORK PROPOSED FOR THIRD QUARTER 1998 <br /> EMCON will continue to perform quarterly groundwater sampling on behalf of IBC The <br /> next sampling event is tentatively scheduled for August 1998 Groundwater samples will <br /> be collected from monitoring wells MW-1 and MW-2 and will be analyzed for TPHG, <br /> BTEX isomers, and MTBE using USEPA Modified Method DHS/LUFT and 8020, <br /> respectively, and for the oxygenates MTBE, tertiary butanol, DIPE, ETBE, and TAME, <br /> using USEPA Method 8260 <br /> SACC 1DMSIIBCUBCST0CK QMZ-981mtt 1 Fmcon <br /> Rev 0,8118/98 <br />