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o¢ologicalT¢cltnicsInc. Page 3 <br /> Site Conceptual Model <br /> Project No. 989.2 <br /> December 17,2003 <br /> ' 2.0 SOURCES OF CONTAMINATION <br /> ' 2.1 Historical Sources of Petroleum Hydrocarbons <br /> Two (2) 1,000-gallon USTs were installed at the VWDC site in June of 1974. The tanks <br /> ' were used to fuel both company and personal vehicles for business purposes. On June 8, <br /> 1994, two USTs along with a fuel dispenser and associated piping were removed from the <br /> site. The location of the former tank pit is shown-in Figure 2. Contamination was detected <br /> ' during the tank pull and was the source of petroleum hydrocarbons found at the site. BTEX, <br /> TPH-G and lead were detected in the original sampling event. The tank removal and relative <br /> laboratory results are discussed in William J. Hunter& Associates—Interim Report Covering <br /> Results of Soil Contamination Investigation dated January 3, 1995. <br /> 2.2 Current Sources of Petroleum Hydrocarbons <br /> The Valley Wholesale Drug Company no longer provides fuel to company vehicles. There <br /> ' are no USTs and no potential sources for petroleum hydrocarbon releases remaining at the <br /> site. <br /> 3.0 NATURE & EXTENT OF CONTAMINATION <br /> ' A summary of soil analytical data is included as Table 1 and a summary of groundwater <br /> analytical data is included as Table 2 of Appendix A. <br /> ' Figure 2 is a site map showing the locations of the former UST pit, structures, soil borings, <br /> GeoProbe boreholes and groundwater monitoring wells. Figure 3 is a rose diagram <br /> indicating historical groundwater gradients and bearings. <br /> ' The excavation of the USTs and the collection of soil samples during the tank removal phase <br /> of work are discussed in William J. Hunter & Associates — Interim Report Covering Results <br /> ' of Soil Contamination Investigation dated January 3, 1995. Plate IV of the report shows the <br /> location of the excavation and soil sample points (Hunter et al.). Plate VII of the report <br /> ' shows plan and section views of the final excavation and soil sample locations (Hunter et al.). <br /> 3.1 Nature of Contamination <br /> ' Contamination is attributed to a leak associated with the USTs in place at VWDC between <br /> June 1974 and June 1994. Soil and groundwater samples have been collected and analyzed <br /> ' during various stages of work performed at the site since the removal of two (2) 1,000-gallon <br /> USTs on June 1, 1994. Testing has been done to determine the presence of BTEX, TPH-G <br /> and fuel oxygenates including; MtBE, ETBE, TAME, DIPS, TBA, 1,2-DCA and EDB from <br />