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. Mr Travis Bryant Project 22605-101003 <br /> December 4, 1998 <br /> Page 3 <br /> TPHG, benzene, and total xylenes were detected in samples collected form wells MW-1 <br /> and MW-2 Ethylbenzene was also detected in well MW-2 TPHG, benzene, and total <br /> xylenes concentrations in MW-1 were 97 5 micrograms per liter (ug/L), 5 17 ug/L, and <br /> 0 684 ug/L, respectively TPHG, benzene, ethylbenzene, and total xylenes concentrations in <br /> MW-2 were 206 ug/L, 0 893 ug/L, 2 87 ug/L, and 0 832 ug/L, respectively All oxygenates <br /> were below laboratory detection Iimits using USEPA Method 8260 Results of laboratory <br /> analyses are presented in Tables 1 and 2 <br /> CONCLUSIONS <br /> The typical hydraulic gradient near the intersection of Charter Way and Lincoln Street has <br /> generally been toward the northeast Groundwater elevations decreased approximately 109 <br /> feet from the previous sampling event (August 1998) Results of this monitoring event <br /> indicate that concentrations of dissolved gasoline hydrocarbons were generally consistent <br /> from the previous sampling events <br /> i WORK PROPOSED FOR FIRST QUARTER 1999 <br /> EMCON will continue to perform quarterly groundwater sampling on behalf of IBC The <br /> next sampling event is tentatively scheduled for February 1999 Groundwater samples <br /> will be collected from monitoring wells MW-1 and MW-2 and will be analyzed for <br /> TPHG, BTEX isomers, and MTBE using USEPA Modified Method DHS/LUFT and <br /> 8020, respectively, and for the oxygenates MTBE, tertiary butanol, DIPS, ETBE, and <br /> TAME, using USEPA Method 8260 <br /> Please call if you have questions regarding this report or any aspect of the project <br /> Sincerely, <br /> EMCON <br /> Mark Capps Jay J son <br /> Project Geologist S for oject Supervisor <br /> R G 6561 R G 867 <br /> i <br /> CP1E UBCIQTRLYIIBCQ498 DOC-98usg 1 aEmcon <br /> Rev 0,12/4/98 <br />