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�I <br /> SECTIONF®UR Amore Assessm®na <br /> The Domenico groundwater model represents the groundwater source term as a vertical plane source, <br />' perpendicular to groundwater flow, releasing dissolved constituents into groundwater passing through <br /> the plane <br /> Ca, = exp(x/20X <br /> I– 1+4.UaxR, /v (SW 14�)erf(S, /4 c—= ) <br /> I ]erf <br /> where <br /> v =K#r /0, <br /> where <br />' CN,=Concentration of constituent I at distance x downstream of source(mg/1 or mg/m3) <br /> C,, =Concentration of constituent I in Source Zone(mg/1 or mg/m3) <br /> x =distance downgradient of source(cm) <br /> ax =Longitudinal groundwater dispersivrty(cm) <br /> oy =Transverse groundwater dispersivrty(cm) <br /> az =Vertical groundwater dispersivnty(cm) <br /> b =Fust-order degradation rate(day")for constituent I <br /> Sw = Source width(cm) <br />' Sd = Source depth(cm) <br /> R, =Constituent retardation factor <br /> K =Hydraulic conductivity(cm/day) <br /> I =Hydraulic gradient(cm/cm) <br />' Oe =Effective sal porosity <br /> Recommended ASTM default values were used for dispersion coefficients condh <br /> , and effective <br /> soil porosity due to the lack of sufficient site specific data Groundwater parameters used in the <br /> modeling are listed un Appendix A in Output Table 1 for the RBCA evaluation In order to be very <br /> conservative and protective of human health and the environment, the biodegradation half lives used <br />' were 100,000 days for all chemicals which is orders of magnitude higher than the literature values for <br /> groundwater indicate Model results from the RBCA modeling are also included in Appendix A. <br /> Groundwater concentrations used in the modeling included all data scenarios discussed in Section 3 <br /> (Tables 3-3 through 3-7) Therefore five different groundwater concentration scenarios were used that <br />' included the following (1) all groundwater data, (2) older groundwater data only, (3) recent <br /> r%1e97W30osNAWOCK ONREPORTSHOREM D0C%6+E9-98 73oogNA%sNn 4-8 <br /> r <br />