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TABLE I <br /> ' AVERAGE POROSITY and <br /> MTRINSIC PERMEABILITY <br /> ' Material Porosity Intrinsic Perineabdity <br /> (darcy, D) cm2 <br /> CIay 45 00005 4 9 x 10-12 <br /> Sand 35 50 4 9 x 10" <br /> ' Gavel 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 5 005 4 9 x 10;4 <br /> Quartzite, Granite I 0 0005 4 9 x 10 S2 <br /> ' One darcy (D) = 0 987 x I0-' cm2 <br /> TABLE 2 <br /> TNTRINSI'C PERMEABILITY and <br /> HYDRAULIC CONDUCTIVITY <br /> ' Matenal Intrinsic Permeability Hydraulic Conductivity <br /> I <br /> cCM2y <br /> Darcy (D) crn/s m/yr <br /> ' Clayey Silts I0-12 to 10-9 10-4 to 10-1 10-1 to 10-4 0 032 to 32 <br /> ' Silty Sand 7YI0'11 to 9X10"' 7x10-3 to 90 7x10 t0 9x10"z 2 2 t0 28,401 <br /> Clean Sand 10'9 to I0 5 10`1 to 103 104 to 1 32 to 320,000 <br /> ' Gravel 1Q-6 to 10.3 IO2 to 105 10'1 to 10' 32,000 to ? 2x30' <br /> 1 arils = 315,567 m/yr <br /> ' References <br /> Table I Approxirnate average Porosity and Intrinsic Permeability of,anotis materials tzl,en from Hvdrofoe-,far <br /> ' En Meers by Linsley,Kohler and Paulhus,c 1982 Table 6-2 <br /> Table 2 Table of Ranges of Int-insic Permeability and H}driufic Conducu'vity from Spinna3,er PLUS and <br /> HyperVenitlate modefmg program based on the article"A Practical Approach In the Design,Operation,and <br /> Momtormg of Sol] Venting Systems~by P C 3ofuis011 et. al <br />