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1 <br /> ' RISC User's Manual Version 4 0 <br /> Again, it is assumed that CT can be accounted for by summing the mass in the solid, <br /> liquid, and vapor phases (1 a no residual is present) If the liquid phase concentration, <br /> Cw, calculated with equation A-15a exceeds the effective solubility of the compound, <br /> then it is assumed that residual phase is present(and equation A-15a does not apply) <br /> 1 <br /> A 4 6 Source --When Residual Phase Hydrocarbon is Present <br /> If there is residual phase hydrocarbon present in the source, the aqueous <br /> concentration, C, will be calculated from <br /> C, = XS (A-17) <br /> where <br /> S = aqueous solubility of pure component [mg/1 or kg/m 31 <br /> ' x = mole fraction of component in the hydrocarbon mixture <br /> [mol/mol] <br /> The mole fraction is calculated from <br /> ' x = m (A-18) <br /> m rafr <br /> X T F,MWrrx (A-19) <br /> ' where <br /> M = total moles of component [mol] ( perL F' A) <br /> 1 r <br /> mTPH = total moles of hydrocarbon mixture [mol] ( MWY,.If A) <br /> avK <br /> ' Lx = thickness of the source area [cm] <br /> i <br /> A = area(plan view)of the source [cm2] <br /> AI"WrrH = average molecular weight of hydrocarbon{g/mol] <br /> MM = average molecular weight of component: [g/mol] <br /> 1 <br /> A-12 <br /> 1 <br />