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' RISC User's Manual Version 4 0 <br /> • <br /> Table A-1 Data Requirements for the Vadose Zone Model <br /> Typical Range of Values <br /> Units Minimum Maximum <br /> ' MEDIA-SPECIFIC PARAMETERS <br /> Porosity cm3/cm3 001 05 <br /> Irreducible Water Content cm3/cm3 0 porosity <br /> ' Fraction Organic Carbon g oc/g soil 0 001 005 <br /> Hydraulic Conductivity m/day 1 OOE-07 100 <br /> Soil Bulk Density fraction 1 4 22 <br /> van Genuchten Parameter dimensionless —1 3 <br /> ' Unsaturated Zone Thickness m site-specific site-specific <br /> SOURCE PARAMETERS <br /> ' Length of Source (x-direction) m site-specific site-specific <br /> Width of Source(y-direction) in site-specific site-specific <br /> ' . Thickness of Source(z- m site-specific site-specific <br /> direction) <br /> ' TPH DATA <br /> Molecular Weight of TPH g/mol 80 120 <br /> ' Concentration of TPH mg/kg site-specific site-specific <br /> CHEMICAL SPECIFIC DATA (individual chemical component) <br /> Molecular Weight g/mol chem-specific chem-specific <br /> Source Concentration mg/kg site-specific site-specific <br /> ' Solubility mg/l chem-specific chem-specific <br /> Diffusion Coefficient in Air cm2/s chem-specific chem-specific <br /> Diffusion Coefficient in Water cm2/s chem-specific chem-specific <br /> K. ml/g chem-specific chem-specific <br /> ' Degradation Rate l/d site-specific site-specific <br /> Henry's Law Constant (mg/I)/(mg/1) I chem-specific I chem-specific <br /> • <br /> 1 <br /> A-20 <br />