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} <br /> k <br /> 1 SUMMARY <br /> Murray& Associates was retained by Mr. Lambert C. Barnum of San Andreas, California <br /> to assess specific environmental concerns associated with the apparent over spillage of waste <br /> oil from a 200-gallon underground storage tank. The storage tank was excavated and <br /> removed from the Stan Morri Ford Dealership located at 104 West 11th Street in Tracy, <br /> California in November 1988(Figure 1). The Ford Dealership consists of approximately.62 <br /> acres in Section 21, Township 2 South, Range 5 East, located in the northern part of San <br /> Jouquin County. The property is owned by Mr. Lambert Barnum and has been leased to <br /> the owners of the Ford Dealership since 1970. Figure 2 is a plot plan of the facility which <br /> shows the location of buildings, perimeter fencing, asphalt or concrete cover, water and <br /> sewer lines, and the location of the former underground waste oil tank. The facility was;. <br /> constructed in 1940 and has functioned as a Ford Dealership for over 45 years. A Tank <br /> Excavation Assessment Report was prepared and forwarded to the San Joaquin County <br /> Health Department in February 1990. Initial water samples collected from the excavation <br /> identified the presence of aromatic hydrocarbons and solvents. <br /> Water samples collected from the three groundwater monitoring wells installed during this <br /> phase of the investigation'detected no aromatic hydrocarbons, but found low levels of <br /> purgeable halocarbons, specifically dichlorodifluoromethane, chloroethane, 1,1 <br /> dichloroethane and 1,1,1 trichloroethane. Chloroethane and dichloroethane are.believed to <br /> - be chemical intermediates of 1,1,1 trichloroethane. <br /> Dichlorodifluoromethane is commonly used as a low temperature solvent, in the freezing of <br /> foods by direct contact, even in the chilling of cocktail glasses. Ther2 are no state or EPA <br /> drinking water standards,no state action levels,and no known cancer or non-cancer health <br /> advisories or suggested response levels. Apparently dichlorodifluoromethane does not <br /> become a health concern until it reaches concentrations of at least 50,000 ppm(Montgomer; <br /> - and Welkom, 1989). <br /> The presence of trichloroethane and its chemical intermediates suggest the possible past use <br /> of the product by the garage, probably as a solvent for the cleaning of metal parts. <br /> LJ 1 <br />