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RISC Manual Version 4.0 <br /> Table H-9. Parameters Used in Table H-8,Groundwater Attenuation Factor. <br /> Parameters Definithons Units <br /> AFdom attenuation factor calculated using the Domenico (mg/l)/(mg/l <br /> model ) <br /> Co dissolved concentration in groundwater at the mg/l <br /> source or directly underneath the soil source <br /> C(x,y,z) dissolved concentration in groundwater at a mg/l <br /> downgradient location where x is in the <br /> direction of the groundwater flow on the <br /> centerline of the plume <br /> V groundwater seepage velocity(non-retarded) cm/d <br /> (Calculated as v = k *i/0, where 0 =the <br /> porosity of the saturated zone) <br /> WY width of the groundwater source in the horizontal cm <br /> direction, perpendicular to groundwater flow <br /> (this is an input parameter,unique to the <br /> Domenico model) <br /> WZ thickness of the groundwater source in the vertical cm <br /> direction,perpendicular to groundwater flow <br /> (assumed to be equal to the groundwater <br /> mixing zone height, Sgw) <br /> ax longitudinal dispersivity(in the direction of cm <br /> groundwater flow)(Calculated as ax=0 1 * x) <br /> ay transverse dispersivity(perpendicular to cm <br /> groundwater flow in the horizontal direction) <br /> (Calculated as %=%/3) <br /> ax vertical dispersivity (Calculated as ay= ax/3) cm <br /> chemical-specific degradation rate 1/d <br /> H-26 <br />