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R WHO <br /> rry <br /> �--, persistence of tetrachloroethylene in MW-2, the up-giadient monitoring well, prompted <br /> a second investigation of site activities in June, 1991 at the Stan Mori Dealership. During <br /> this second investigation it was discovered that employees detailed new cars which arrive <br /> at the dealership in an area adjacent to the service garage. The new cars, particularly <br /> foreign cars are usually coated with a protective wax as well as grease and oil. It is <br /> therefore possible that solvents have been used to clean and detail the new cars which <br /> contain chlorinated compounds found in the groundwater to cut the wax and grease. Since <br /> the location of the dealership is located approximately 50 feet up-graclie*►t of MW-2, <br /> it is likely that the car wash operation is the source for much of the continued <br /> contamination found in the monitoring wells at the site. It would also explain the presence <br /> of these compounds in MW-2, the up-gradient monitoring well at the site. <br /> Although the chlorinated hydrocarbons are present at levels well below state and federal <br /> ` action levels and hence require no further remediation, it is prudent that rinse water from <br /> the car wash operations be contained, or recycled to prevent the continued impact on <br /> water quality. <br /> Specific work performed during this on-going investigation have includ <br /> E <br /> 77 <br /> 1. Excavation and removal of the 200-gallon waste oil tank; <br /> i <br /> 2. Excavation and removal of the majority of all waste oil contaminated soil; <br /> 3. Preparation of the Problem Assessment Workplan and application for monitoring <br /> well permits. <br /> 4. Drilling of four soil borings and the conversion of three of the borings to <br /> groundwater monitoring wells, MW-1, MW-2 and MW-3- <br /> S. Collection of soil samples at 5 foot intervals down to groundwater. <br /> 2 <br /> �, T <br />