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t TABLE 1 <br /> AVERAGE POROSITY and <br /> INTRVgSIC PERMEABILITY <br /> ' Material Porosity Intrinsic Permeability <br /> (darty, D) cm2 <br /> ' Clay 45 0.0005 4.9 x 10-" <br /> ' Sand 35 50 4.9 x 10" <br /> Gravel 25 5,000 4.9 x 10"5 <br /> ' Gravel and Sand 20 500 4.9 x 10-6 <br /> Sandstone 15 5 4.9 x 10' <br /> Dense Limestone and Shale 5 0.05 4.9 x 10` <br /> Quartzite, Granite 1 0.0005 4.9 x 10-" <br /> ' One darty (D) = 0.987 x 10'' cm' <br /> TABLE 2 i <br /> NTPJNSIC PERMEABILITY and <br /> HYDRAULIC CONDUCTIVITY <br /> ' Material Intrinsic Permeability Hydraulic Conductivity <br /> cmDarcy (D) cm/s m/yr <br /> Cla}ey Silts 10'12 to 10'9 10-4 to 10-' 10"' to 104 0.032 to 32 <br /> ' Silty Sand 7x10'" to 9x10"' 7x10'3 to 90 7x10 to 9x10-2 2.2 to 28,401 <br /> Clean and 10"9 to 10'5 10-' to 103 104 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 /> 1 cm/s = 315,567 m/yr <br /> References <br /> Table 1: Approximate average Porosity and Intrinsic Permeability of various materials Laken from Hl'drologv for <br /> Engineers by Linsley,Kohler and Paulhus,c 1932 Table 5-2 ==' <br /> Table 2: Table of Ranges of Intrinsic Permeability and Hydraulic Con&ctivity from SpirLnaker PLUS and <br /> Hyper Ventilate modeling program based on the article"A Practical Approach to the Design,Operation,and <br /> Monitoring of Soil Venting Systems" by P. C.Johnson et. al. <br />