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RISC Manual Version 4 0 <br /> • <br /> used if the model is run in a stand-alone mode (not linked with the Vadose Zone or <br /> Saturated Soil models) <br /> Table E-1. Data Requirements for the Groundwater Vapor Model. <br /> Typical Range of Values <br /> Units Minimum Maximum <br /> UNSATURATED ZONE <br /> Porosity cm3/cm3 0 O1 .05 <br /> Residual Water Content cm3/cm3 0 porosity <br /> (irreducible) <br /> Hydraulic Conductivity m/day 1 OOE-07 jiuu <br /> Distance from groundwater to in site-specific site-specific <br /> foundation <br /> FOUNDATIONBUILDING PARAMETERS <br /> Cross-Sectional Area for Volatile m2 site-specific site-specific <br /> Flux <br /> • Volume of Building m3 site-specific site-specific <br /> No of Air Exchanges per Day d"i residential 12 location/site- <br /> industrial 20 specific <br /> Fraction of Cracks(by area)in cm2/cm2 site-specific site-specific <br /> Building Foundation <br /> CHEMICAL SPECIFIC DATA(individual chemical component) <br /> Concentration in Groundwater* mg/1 site-specific site-specific <br /> Diffusion Coefficient in Air cm2/s chem-specific chem-specific <br /> Diffusion Coefficient in Water cm2/s chem-specific chem-specific <br /> Henry's Law Constant 1(mg/l)/(mg/I) chem-specific chem-specific <br /> * Only needed if the groundwater concentration is not calculated by another model <br /> E-8 <br />