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Geologicalreckni�clr�c. Page 4 <br /> Initial Site Conceptual Model <br /> Project No. 1030.2 <br /> June 18,2003 <br /> F <br /> The highest concentrations of BTEX and TPH-G constituents are found near the former <br /> ' gasoline UST. The northern most monitoring well (MW-4) is approximately downgradient <br /> from the former gasoline UST and elevated levels of BTEX and TPH-G constituents were <br /> detected in the soil sample from 14-feet bgs. The soil analytical data are summarized in <br /> ' Table 1 of Appendix A. <br /> ' Groundwater analytical data indicate the presence of BTEX and TPH-G constituents in <br /> MW-1 and MW-4. The groundwater analytical data are summarized in Table 2 of <br /> Appendix A. <br /> ' 3.2 Extent of Contamination <br /> Soil Contamination <br /> TPH-G appears to be defined to the southwest by MW-3, southeast by MW-2, and vertically <br /> by MW-101. Figure 4 shows the approximate lateral extent of TPH-G soil contamination in <br /> map view. Figure 5 shows the approximate lateral and vertical extent of the TPH-G plume <br /> in cross section. <br /> Groundwater Contamination <br /> TPH-G appears to be defined to the southwest by MW-3, southeast by MW-2 and vertically <br /> by MW-101. Figure 6 indicates the approximate lateral extent, map view, of TPH-G in the <br /> ' groundwater. <br /> ' 4.0 FATE AND TRANSPORT <br /> ' 4.1 Surface Features <br /> The land surrounding the site is relatively flat and is primarily used for agricultural <br /> ' purposes. The area south of the house and east of the shop (Figure 2) is covered with road <br /> base rock. The front and back of the house is covered in lawn. The uncovered soil of the <br /> property would most likely not hinder infiltration from potential surface spills. The <br /> property is in residential use and bordered on all sides by fields in agricultural use. There <br /> are no rivers or lakes within one mile of the property. <br /> ' 4.2 = Hydrogeology of Site <br /> A site-specific groundwater gradient and bearing was calculated from the depth to water <br /> ' measurements taken during the January 29, 2003, groundwater monitoring event. The <br /> bearing was N42°E and the gradient was 0.0033 ft/ft. The average groundwater elevation <br />