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KLEINFELDER <br /> { <br /> TABLE 1-3 <br /> j GENERAL CHARACTERISTICS OF GRAVEL, S , SILT AND CLAY <br /> Hydraulic <br /> Permeability Conductivity Porosity <br /> Material (k), cm (K) cm/s (n) % <br /> Gravel 10-3 - 10-6 10"1- 10-2 25 -40 <br /> Sand 10-5 - 10-9 10"1 - 10-4 25 -50 <br /> Silt 10"8 - 10 10.3 - 10"7 35 -50 <br /> Clay 10"12 - 10-15 10-7- 10-10 40- 70 <br /> 1.3.4 Ground Water Gradient <br /> There is no regional information on the depth to ground water or the direction of ground <br /> water flow in the area of Foothill Sanitary Landfill. <br /> Kleinfelder measured the depth-to-ground water in six wells near the site in October 1987 <br /> to estimate ground water flow direction. Table 1-4 presents the depth to ground water and <br /> approximate ground water elevations based on regional topography, for these wells. <br /> TABLE 1-4 <br /> OCTOBER 1987 WATER LEVEL MEASUREMENTS <br /> Map Well.No. Depth to Water (ft) Approx. Land Approx.Water <br /> Elevation(ft) Elevation (ft) <br /> 1 249 307±2 58±2 <br /> 2 167 264±2 97±2 <br /> 3 177 237±5 60±5 <br /> 6 209 295+5 86±5 <br /> 7 238 330±5 _ 47±5 <br /> 8 167 245+10 78+10 <br /> FOOTHILL 10 <br />