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- <br /> • G3 <br /> I SUMMARY <br /> . Lambert C.Barnum of San Andreas, California <br /> Murray &Associates was retained by Mr <br /> Fa <br /> to aasess specific environmental concerns associated with the apparent over spillage of <br /> waste oil from a 200-gallon underground storage tank. The storage tank was excavated <br /> and removed from the Stan Morri Ford Dealership located at 104 West 11th Street ix. <br /> Tracy, California in November 1988 (Figure 1). The Ford Dealership consists of <br /> approximately .62 acres in Section 21, Township 2 Scuth, Range 5 East, located in the <br /> northern part of San Joaquin County. The property is owned by Mr.Lambert Barnum and <br /> has been leased to the owners of the Ford Dealership since 1970. Figure 2 is a plot plan <br /> of the facility which shows the location of buildings, perimeter fencing, asphalt or concrete <br /> cover, water and sewer lines, and the location of the former underground waste oil tank. <br /> The facility was constructed in 1940 and has functioned as a Ford Dealership for over 45 <br /> years. A Tank Excavation Assessment Report was prepared and forwarded to the San <br /> Joaquin County Health Department in February 1.990. Initial water samples collected from <br /> the excavation identified the presence of aromatic hydrocarbons and solvents. <br /> Water samples collected from the three groundwater monitoring wells initially installed in <br /> May, 1990 and sampled on a quarterly basis for the last year have detected no aromatic <br /> hydrocarbons. The water however continues to show trace levels of purgeable halacarbon <br /> contamination, specifically dichlorodifluoromethane, chloroethane, 1,1 dichloroethane and <br /> 1,1,1 trichloroethane. Chloroethane and dichloroethane are believed to be chemical <br /> intermediates of 1,1,1 trichloroethane. <br /> Dihlorodifluoromethane is commonly used as a low temperature solvent, in the freezing <br /> c <br /> of foods by direct contact, even in the chilling of cocktail glasses. There are no state or <br /> EPA drinking water standards, no state action levels, and no known cancer or non-cancer <br /> health advisories or suggested response levels. <br /> The presence of trichloroethane and its chemical intermediates suggest the possible past <br /> use of the product by the garage, probably as a solvent the cleaning of meta parts.—The-- <br /> of <br /> 1 <br />