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TRAVEL PATH <br />SCENARIO <br />(transport time) <br />HYDRAULIC CONDUCTIVITY <br />POROSITY <br />(percent) <br />dh \dl <br />VELOCITY <br />(feet per year) <br />DISTANCE <br />(feet) <br />TIME <br />(years) <br />(feet per year) <br />1 cm/sec <br />Cell to <br />White River Alluvium <br />(Through bedrock) <br />slowest <br />0.0105 <br />8.0E -09 <br />30% <br />0.225 <br />0.008 <br />205 <br />26032 <br />fastest <br />1.05 <br />1.0E -06 <br />5% <br />0.225 <br />4.73 <br />205 <br />43 <br />median <br />0.105 <br />1.0E -07 <br />18% <br />0.225 <br />0.13 <br />205 <br />1562 <br />Cell to closest <br />alluvial well down stream <br />(Through bedrock and alluvium) <br />slowest <br />26280 <br />2.5E -02 <br />45% <br />0.005 <br />292.0000 <br />6000 <br />26052 <br />fastest <br />568000 <br />5.4E -01 <br />35% <br />0.005 <br />8114.2857 <br />6000 <br />44 <br />median <br />297,000 <br />2.8E -01 <br />40% <br />0.005 <br />3712.5000 <br />6000 <br />1564 <br />Impoundment to nearest <br />domestic well (Rondell) <br />(Through bedrock) <br />slowest <br />0.0105 <br />1.0E -09 <br />30% <br />0.001 <br />0.00004 <br />9700 <br />277142857 <br />fastest <br />1.05 <br />1.0E -06 <br />5% <br />0.001 <br />0 0210 <br />9700 <br />461905 <br />median <br />0.105 <br />1.0E -07 <br />18% <br />0.001 <br />0.0006 <br />9700 <br />16628571 <br />TABLE 1 - <br />SATURATED FLOW ESTIMATES - WESTERN GRAVEL E &P WASTE DISPOSAL FACILITY <br />V= K *(dh /d1)/P <br />T =DN <br />V= VELOCITY OF FLOW IN FEET PER YEAR <br />K= HYDRAULIC CONDUCTIVITY IN FEET PER YEAR <br />P= EFFECTIVE POROSITY <br />dh/d1= GRADIENT OF FLOW SUCH AS FEET PER FEET <br />D= DISTANCE TRAVELED IN FEET <br />T =TIME IN YEARS <br />Notes: <br />Porosity ranges taken from Freeze and Cherry (1979) or Fetter (1988). <br />Vertical hydraulic conductivity ranges taken from USDA UMTRA Project Office, 1990 <br />Lateral hydraulic conductivity ranges of alluvial sands and gravels taken from USGS Report 84 -4307 (1985). <br />dh/dl is the difference in site elevations divided by the distance. <br />All soil and bedrock units are assumed to be saturated and hydraulically continuous. <br />Lateral movement to White River Alluvium assumed down through bedrock 205 feet <br />Lateral movement to nearest down gradient alluvial water well assumed down through bedrock for a distance of 205 feet then 6000 feet through alluvium <br />Lateral movement to nearest down gradient domestic water well through bedrock for a distance of 9700 feet and with an elevation drop of 10 feet <br />NWCC, Inc. Page 1 of 1 <br />F Uobs \l0 -8718 Western Gravel E&P Dtspossl Facdtty\F.ngmeermg\Darcy Calculations <br />lore} 1 -18 -11 xis <br />1/19/2011 <br />