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The site specific properties used in the modeling are shown below <br /> Properties Values Sources <br /> Annual Precipitation 14 inches Noaa (1988) <br /> Depth to Groundwater 37 to 45 feet S Geels et al., (1994a, 1994b) <br /> rr Projects No 190916 7 and 190916 8 <br /> Aquifer Thickness 6 to 15, avg 10 Harlan Knoll, San Joaquin County <br /> feet Department of Environment and Health, <br /> personal communication, 1/13/95 <br /> Hydraulic Gradient 0.01 feet/feet S Geels et al , (1994a) <br /> rr Projects No 190916 7 <br /> Water Density 1 gram/cm3 White, (1979) <br /> Soil Type silty sand with S Geels (1994), <br /> gravel, clay layer IT Projects No 190916 7 and 190916 8 <br /> from 25 ft to 30 ft <br /> bgs. <br /> Bulk Density 14 g/ml Ravi and Johnson (1993) <br /> Effective Porosity 041 % Ravi and Johnson (1993) <br /> Hydraulic Ravi and Johnson (1993), VLEACH <br /> Conductivity Manual (Appendix B-2) for loamy sand <br /> 67 (cm/hour) <br /> 5 87x1 (cm/year) <br /> Volumetric Water 15 % Das (1985) <br /> Content <br /> Organic arbon 0.35 % Ravi and Johnson (1993) <br /> Content <br /> Location I is located entirely beneath a 300 x 100 foot building and Location H is entirely <br /> overlain by concrete and pavement Drill logs for the project locations show there is a clay <br /> layer between 25 and 30 feet (Geels et al , 1994a, 1994b). This clay layer is situated well <br /> above the groundwater. Clay layers have very low permeability and are often effective <br /> barriers in the prevention of vertical contaminant migration. In spite of this, we did not <br /> include this clay layer in our model Hence, the groundwater contamination levels derived <br /> M7VW-O6-95/UST/95-0089 14 <br />