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Mr Travis Bryant Project 22605-10103 <br /> • June 8, 1998 <br /> Page 3 <br /> The results of laboratory analyses indicated that dissolved hydrocarbons were present in the <br /> monitoring wells TPHG was detected in monitoring wells MW-1 and MW-2 at <br /> concentrations of 1,600 and 69 ppb,respectively Benzene was detected in monitoring wells <br /> MW-1 and MW-2 at concentrations of 130 and 2 8 ppb, respectively The results of <br /> laboratory analyses for the oxygenates MTBE, tertiary butanol, DIPE, ETBE, and TAME <br /> were all below laboratory detection limits Results of laboratory analyses are presented in <br /> 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 3 28 feet from the previous <br /> sampling event (November 1997) Results of this monitoring event indicate that <br /> concentrations of dissolved gasoline hydrocarbons increased in well MW-1 and decreased <br /> in well MW-2 from the previous sampling event <br /> WORK PROPOSED FOR SECOND QUARTER 1998 <br /> EMCON will continue to perform quarterly groundwater sampling on behalf of IBC The <br /> next sampling event is tentatively scheduled for May 1998 Groundwater samples will be <br /> collected from monitoring wells MW-1 and MW-2 and will be analyzed for TPHG; <br /> BTEX isomers, and methyl tert-butyl ether <br /> Please call if you have questions regarding this report or any aspect of the project <br /> Sincerely, <br /> EMCON <br /> W-41- <br /> Mark Capps JayJo sonProject Geologist roject Supervisor <br /> R G 5867 <br /> • <br /> SACW 1PJ212605126051010 3AA-98\cbell 1 mon <br /> Rev 0,6/8/98 <br />