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RISC Manual Version 4.0 <br /> Table H-5. Soil,Building,Surface,and Subsurface Parameters Used in <br /> Table H-4. <br /> Parameters Definitions Units <br /> d lower depth of surficial soil zone cm <br /> De" diffusion coefficient in air(chemical-specific) cm2/s <br /> DVMW diffusion coefficient in water(chemical-specific) cm2/s <br /> ER indoor air exchange rate S i <br /> f0c fraction organic carbon in soil g OC/g soil <br /> H henry's law coefficient (cm3-H20)/(cm3-air) <br /> hw thickness of capillary fringe cm <br /> h„ thickness of vadose zone cm <br /> J infiltration rate of water through vadose zone cm/yr <br /> k0c carbon-water sorption coefficient cm'H2O/g OC <br /> ks soil-water sorption coefficient(ka x fa) cm3 H20/9 soil <br /> Ls indoor air volume/infiltration area ratio cm <br /> Laack foundation thickness cm <br /> L9. depth to groundwater(h,,+hv) cm <br /> L, depth to subsurface soil sources cm <br /> Pe particulate emission rate g/cm2-s <br /> S pure chemical solubility in water mPI- <br /> Ue,. wind speed above ground surface in outdoor air cm/s <br /> mixing zone <br /> U9. groundwater Darcy velocity(gradient x hydraulic cm/yr <br /> conductivity) <br /> W width of source area parallel to wind,or cm <br /> groundwater flow direction <br /> S.r outdoor air mixing zone height cm <br /> S7. groundwater mixing zone thickness cm <br /> n areal fraction of cracks in building foundation (cm2 cracks)/(cm2 area) <br /> B—p volumetric air content in capillary fringe soils (cm3 air)/(cm3 soil) <br /> 0 volumetric air content in foundation cracks (cm3 air)/(cm3 soil) <br /> OW volumetric air content in vadose zone soils (cm3 air)/(cm3 soil) <br /> 0 T total soil porosity (cm3 voids)/(cm3 soil) <br /> B p volumetnc water content in capillary fringe soils (cm3 water)/(cm3 soil) <br /> 0 WCr8C, volumetric water content in foundation cracks (cm3 water)/(cm3 soil) <br /> Q,,,,S volumetnc water content in vadose zone soils (cm3 420)/(cm3 soil) <br /> PS soil bulk density g/cni <br /> i <br /> averaging time for vapor flux s <br /> H-22 <br />