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it <br /> cwtogica[TeckKusInc, Page 5 <br /> Initial Site Conceptual Model <br /> Project No. 1030.2 <br /> June 18,2003 <br /> F <br /> recorded at the site for this monitoring event was 64.10 feet above mean sea level. Gradient <br /> calculations at the site are consistent with those previously recorded for Sinclair Trucking. <br /> ' The historical average depth to water is 11.15 feet below top of casing. The historical <br /> average groundwater elevation is 65.46 feet above mean sea level. The average <br /> ' groundwater bearing and slope recorded at the site are 0.0034 ft/ft and N421E respectively. <br /> A summary of groundwater elevation and gradient is attached as Table 3 in Appendix A. <br /> Figure 3 is a rose diagram showing historical groundwater bearing and slope. <br /> Vertical groundwater gradients were calculated for the site using the MW-I/MW-101 well <br /> pair and found to be positive, indicating an upward component to contaminant migration. <br /> MW-1 is screened from 5 to 20 feet bgs and MW-101 is screened from 29.5 to 34.5 feet <br /> bgs. The vertical gradient is approximately one order of magnitude less than the horizontal <br /> 1 gradient. <br /> 4.3 Climatic Summary <br /> Average Temperature: 62.45° F <br /> Average High Temp: 74.4° F <br /> Average Low Temp: 49.7° F <br /> Highest Recorded Temp: 112° F <br /> Lowest Recorded Temp: 17° F <br /> ' Average Relative Humidity: 86% <br /> Average Rainfall: 12.19 inches <br /> ' 4.4 Geological Summary <br /> The site map included as Figure 2 shows the line of section for cross section (A-A'). Figure <br /> t 7 shows the geology of the site in cross section. Monitoring well and soil boring locations <br /> as well as the location of the former UST are specified on the site map (Figure 2). Borehole <br /> ' logs are included in Appendix C. <br /> The shallow geology of the site is characterized by clay and silt primarily gray in color with <br /> ' varied degrees of plasticity. A d_irtylsan_d layer was encountered through out the site at <br /> approximately 15-feet bgs. A clay layer dominates the site between 19 and 22 feet bgs. <br /> Each of the sites four water table wells terminated in "plastic" clay. The deep well (MW- <br /> 101) terminated in highly plastic"fat" clay. Dirty sand and_clay define the 25-35 feet bgs <br /> lithology near the former USTs. Groundwater was encountered between 9.5--11.4 feet bgs. <br /> The capillary fringe extended approximately 4 feet above the water table. <br /> 1 <br />