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Phase Partitioning Worksheets Page 2 <br /> I <br /> Having calculated the soil pore water concentrations for TPH-G and benzene using the simple Henry's <br /> I Law Relationship,the concentration of each contaminant adsorbed to the soil phase on a dry weight basis <br /> can be calculated using the following relationship <br /> I <br /> CTd _ CL (PbKd + 8. + <br /> I Pba <br /> I [Lyman, W J at al, <br /> Handbook of Cherrucal Property Fsbmabon Me diods <br /> American Chemical Society, 19901 <br /> Where <br /> CTd = total TPH concentration in soil on a dry weight basis [mg of contaminant/kg of dry soil] <br /> O = the total porosity of sal [cm3/cm3] <br /> 0,,, = the water content of soil [cm3/cm'] <br />' Pb = the dry bulk density of soil [gm/cm3] <br /> Kd = soil water partition coefficient ((gm/gm)/(gm)/(cm3)] <br /> (Kd = ko. - f«) <br /> k,, = normalized organic carbon coefficient (gm/gm/gm/cc) <br /> lipf,, = fractional organic carbon content in soil (mg/mg) <br /> [liven <br /> © = 0 4 cm3/cm3 (porosity of sand, from published literature) <br /> O,, -- 0 15 cm3/cm3 (pore water content of sand, estimated from literature) <br /> Pb = 1 7 gm/cm3 (density of sand, from published literature) <br /> k, = 430 gm/gm/gm/cc for TPH-G (BTEX average, from published literature) <br />' k,. - 83 gm/gm/gm/cc for benzene (from published literature) <br /> %, = 0 007 mg/mg (fractional organic carbon content of sand, estimated from literature) <br /> KK = k • f <br /> d Q� oc <br /> Kd for TPH-G = 430 0 007 = 3 01 gm/gm/gm/cm3 <br /> Kd for benzene = 83 0 007 = 0 58 gm/gm/gm/cm3 <br /> (These chemical constants and soil property estimates are commonly used values for fate and <br /> • transport modeling and are believed to be a reasonable representation of site-specific conditions ) <br />