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Ceokgicjl7"eckxicsInc. Page 3 Initial Site Conceptual Model Project No. 1030.2 June 18, 2003 r 2.2 Current Sources of Petroleum Hydrocarbons ' The site is currently a residence. There are no USTs remaining at the former Sinclair Trucking Site. There are no potential sources for petroleum hydrocarbon releases at the site. ' 3.0 NATURE & EXTENT OF CONTAMINATION A summary of soil analytical data is included as Table 1 and a summary of groundwater ' analytical data from the monitoring wells is included as Table 2 of Appendix A. Figure 2 is a site map showing the locations of the former UST, septic tank, structures, ' monitoring wells and soil borings. Figure 3 is a rose diagram indicating historical groundwater gradients and bearings. ' 3.1 Nature of Contamination Laboratory tests on soil and groundwater were performed on samples collected during the installation of Monitoring Wells at the site. Details regarding sample collection and the results are discussed in GTI reports: Subsurface Investigation Report— September 27, 1995, Subsurface Investigation Report — July 21, 1999, Site Characterization, Monitoring Well ' Installation and Groundwater Monitoring Report--June 18, 2002. Additional laboratory tests have been perfonned on groundwater samples collected from monitoring wells during quarterly groundwater monitoring events. Quarterly Groundwater Monitoring Reports have been prepared and submitted to SCJ PHSIEHD since Sept of 1995. ' Chemicals of concern for the Sinclair Trucking site in Tracy, California are: BTEX and TPH-G. BTEX and TPH-G constituents have been detected during soil and groundwater investigations performed at the site. Testing has been done to determine the presence of fuel oxygenates including MTBE, ETBE, TAME, DIPE, TBA, 1,2-DCA and EDB. Fuel oxygenates have been non-detect in all analyzed samples. Analyzed soil samples, collected from 6 to 14-foot bgs, have indicated the presence of the following constituents: • TPH-G (ranging from ND<1 to 13,600 mg/Kg) - • Benzene (ranging from ND<3 to 171,000 ug/Kg) ' • Toluene (ranging from ND<3 to 630,000 ug/Kg) • Ethyl benzene (ranging from ND<3 to 330,000 ug/Kg) • Total xylenes (ranging from ND<3 to 1,080,000 ug/Kg)