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The MTBE in ground water at 305 South Hutchins Street could not have originated at the site <br /> MTBE is a gasoline additive that was not used until the early 1980's, well after the service station <br /> operations at the site ceased The observed MTBE may instead have originated at the former <br /> Exxon service station located upgradient, across West Loch Avenue at 501 West Lodi Avenue <br /> The Exxon station operated from the tune that MTBE came into common use, in the early 1980's, <br /> until 1995 An ARCO station currently operates at 501 West Lodi Avenue Upgradient monitoring <br /> well MW-5 contains water that has consistently shown the presence of several hundred parts per <br /> billion (ppb) of dissolved MTBE Further, soil samples from 305 South Hutchins Street did not <br /> contain MTBE Thus, the MTBE likely was not leached from the soil profile at 305 South <br /> Hutchins Street <br /> Two monitoring wells, BMW-1 and BMW-2, are located on the upgradient 501 West Lode Avenue <br /> site Water from these two wells contains dissolved TPHg, TPHd, and BTEX In fact, water from <br /> BMW-1 generally has greater concentrations of dissolved fuel hydrocarbons than the downgradient <br /> monitoring wells associated with 305 South Hutchins Street <br /> Based on these data, it appears that the fuel hydrocarbon contamination and the MTBE <br /> contamination in ground water beneath 305 South Hutchins Street originated offsite in the <br /> upgradient direction The former service station operations at 305 South Hutchins Street could not <br /> have been the source of the MTBE, because they were terminated before MTBE came into use as a <br /> motor fuel additive The soil at 305 South Hutchins Street that is contaminated with fuel <br /> hydrocarbons is separated from the lin est known osntnon of the local water table by 8 5 feet or M0 f <br /> more Thus it appears that fuel hydrocarbons have not been leached to the water table beneath 305 <br /> South Hutchins Street <br /> Detectable concentrations of chlorinated hydrocarbons are present in water from all 5 monitoring <br /> wells associated with the 305 South Hutchins Street site The site is located downgradnent from <br /> Guild Cleaners and Busy Bee Laundry and Cleaners (Busy Bee) These two operations have been <br /> identified by the California Regional Water Quality Control Board-Central Valley Region <br /> (CVRWQCB) as being potentially responsible for tetrachloroethene identified in City of Lodi <br /> drinking water in early 1989 Studies performed for the California Environmental Protection <br /> Agency, Department of Toxic Substances Control (DTSC) by URS Consultants indicate that <br /> undelineated plumes of tetrachloroethene and trichloroethane exist in ground water beneath the <br /> Guild Cleaners and Busy Bee sites The 305 South Hutchins Street site appears to be within the <br /> chlormated hydrocarbon plume being investigated by the CVRWQCB and the DTSC As noted <br /> previously, the SJCPHS has indicated that the 305 South Hutchins Street site is not the source of <br /> these chlorinated hydrocarbons Further, SJCPHS has indicated that ground-water remediation of <br /> petroleum hydrocarbons at 305 South Hutchins will not be required because of the presence of the <br /> regional, chlorinated hydrocarbon plume which is being addressed separately <br /> 7 <br />