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. TABLE 1 <br /> AVERAGE POROSITY and <br /> INTRINSIC PERMEABILITY <br /> Material Porosity Intrinsic Permeability <br /> cIG <br /> (darty, D) cm2 <br /> Clay 45 0.0005 4.9 x 10-12 <br /> Sand 35 50 4.9 x 10-7 <br /> Gravel 25 5,000 4.9 x 10.5 <br /> Gravel and Sand 20 500 4.9 x 106 <br /> Sandstone 15 5 4.9 x 10_g <br /> I <br /> Dense Limestone and Shale 5 0.05 4.9 x 1010 <br /> Quartzite, Granite 1 0.0005 4.9 x 10'2 <br /> One darcy = 0.987 x cm- <br /> TABLE 2 <br /> INTRINSIC PERMEABILITY and <br /> HYDRAULIC CONDUCTIVITY <br /> Material Intrinsic Permeability Hydraulic Conductivity <br /> cm'- Darcy (D) cm/s mlyr <br /> Clayey Silts 10 n'- to 10 g 10-4 to 10-' 10' to 10-4 0.032 to 32 <br /> Silty Sand 7x10-" to 9x10-' 7x10-3 to 90 7x10-6 to 9x102 2.2 to 25,401 <br /> Clean an 10-9 to 10"5 10'' to 103 10-4 to 1 32 to 320,000 <br /> Gravel 10-6 to 10-3 102 to 105 10-' to 102 32,000 to 3.2x107 <br /> cm7s = 315,567 m yr <br /> References <br /> Table 1: Approxnnnate average Porosity and Intriiisic Permeability of various materials taken from <br /> Hydrology for Engineers by Lhisley, Kohler and Paullius, c 1952 Table 6-2 <br /> Table 2: Table of Ranges of Intrinsic Permeability and Hydraulic Conductivity from Spinnaker PLUS <br /> and HyperVenntilate modeling program based on the article "A Practical Approach to the <br /> Design, Operation, and Monitorutg of Soil Venting Systems" by P. C. Johnson et. al. <br /> 4 <br />