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CALCULATION SHEET F-2 <br /> DUAL-PHASE EXTRACTION TESTING - DARCY ANALYSIS <br /> Former Canteen Facility <br /> 1500 Shaw Road <br /> Stockton, California <br /> DPE Well-- MW-24 <br /> Piezometers <br /> Parameter Units Definitions MW-13 VE-2A VE-2B <br /> Q scfm Flow Rate from SVE Well 480 480 480 <br /> Pe Pa Atmospheric Pressure 101,325 101,325 101,325 <br /> µ Pa*sec Viscosity of Air 1 80E-05 1 80E-05 1 80E-05 <br /> Re feet Radial Distance from SVE Well 195 288 288 <br /> R. feet Radius of SVE Well 0 417 0 417 0 417 <br /> In(Re 1 R,N) --- Natural Log of Ratio 3 846 4 234 4 234 <br /> Ir --- Pi 314159 314159 314159 <br /> h feet Length of Exposed Screen In SVE Well 300 300 300 <br /> VW in w c Vacuum at SVE Well 920 920 920 <br /> Ve in w c Vacuum at Observation Point"e" 0 275 0 175 0 145 <br /> P, Pa Absolute Pressure at SVE Well 78,432 78,432 78,432 <br /> Pe Pa Absolute Pressure at Point"e" 101,257 101,281 101,289 <br /> (Pez - PV --- Difference of the Squares 4101E+09 4106E+09 4108E+09 <br /> Darcy's Equation Permeability Values <br /> k cm2 Soil Permeability 1 35E-08 1 48E-08 1,48E-08 <br /> AVERAGE SOIL PERMEABILITY: 1 44E-08 cm2 <br /> GEOMETRIC MEAN SOIL PERMEABILITY: 1 44E-08 cm2 <br /> DARCY'S EQUATION NOTES <br /> The following configuration of Darcy's Equation was utilized to determine the apparent soil per- <br /> meability at the site <br /> k <br /> Q Pb In (R./R,,,) C <br /> = <br /> n h (Pe2 - P,n,2) <br /> where <br /> k = Soil Permeability (cm2) <br /> Q = SVE Flow Rate (scfm) <br /> Pe = Base (Atmospheric) Pressure (Pa) <br /> µ = Viscosity of Air (Pa * sec) <br /> Re = Radial distance from SVE well to Observation Point"e" (feet) <br /> R,,, = Radius of SVE Well (feet) <br /> C = Conversion Factor, C = 15 48 (cm2* miny(ft2 *sec) <br /> h = Length of!2xeosed screen at SVE well (feet) <br /> Pe - Absolute Pressure at Observation Point "e" (Pa) <br /> PW - Absolute Pressure at SVE Well "e" (Pa) <br />