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' r <br /> it <br /> TABLE I �- <br /> AVERAGE POROSITY and <br /> +— INTRINSIC PERMEABILITY <br /> FF-- <br /> -Material Porosity Intrinsic Permeability <br /> � 0/Q <br /> (dar J, Dl c,j-j2 <br /> Clay 45 0.000s 4.9 x 10-42 <br /> Sand 35 50 4.9 x 10' <br /> �. Gravel 25 5,000 4.9 x 10-1 <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`0 <br /> Quartzite, Granite 1 0.0005 7 4.9 ). 10`12 <br /> One darcy(D) = 0.987 x 10-' cm' <br /> TABLE 2 <br /> NTRINSIC PER-NEEABILITY and <br /> `r HYDRAULIC CONDUCTIVITY <br /> Material Intrinsic Penneabi.lity Hydraulic Conductivity <br /> cm- Darcy(D) crn/s rr1/yr <br /> Clayey Silts 10-1' to 10-9 10-4 to 10-1 10-7 to 10-4 0.032 to 32 <br /> Silty Sand 7x10"11 to 9XIO-7 7x10`3 to 90 7xI0r4 to 9x10' 2.2 to 28,401 <br /> 4r Clean Sand 10-9 to 10'5 . 10'1 to 103 I0'; to 1 32 to 320,000 <br /> Gravel to 10'3 102 to 105 10-1 to 102 32,000 to 3.2xI07 <br /> I crn/s = 315,5671n/yr <br /> References <br /> Tabie 1: Approximate average Porosity and Intrinsic Pc=eability of various materials taken.from Fvdrolo¢v for <br /> En ' eers by Linsley,Kohler and Paulhus,c 1982 Table 6-2 <br /> Table 2: Table of Ranges of Intrinsic Pen-ncability and Hydraulic Conductivity from Spinnake<PLUS and <br /> HyperV=tilate modeling prograna based on the article"A Practical Approach to the Design,Operation,and <br /> Monitoring of Soil Venting Systems"by P.C.Johnson ct.al. <br /> - -------------- <br />