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' RISC User's Manual Version 4 D <br /> i <br /> ' Well <br /> Volatilization <br /> HV �L. e t <br /> � a �{' ys'F <br /> ,�"'@ +"„'.r{3 �- s h��gf�`�`<.� +� rig,�>�•� 1' y � ,.� , I <br /> Vadose <br /> OA Zone <br /> igr,lf 9 t ,A fr lrwkti •r1 '+"fib a ter', ^k_ Y.� <br /> P r + G <br /> Lo noa� k tt F # A .rEK av <br /> ' Saturated <br /> Zone <br /> 1 <br /> FIGURE A-1. Schematic of the Vadose Zone Model. <br /> This appendix describes the equations used to predict volatile losses from a vadose <br /> zone source, leaehinghnass loading rates from the source to groundwater and <br /> ' • concentration distributions in the vadose zone Appendix B describes the model used <br /> for the saturated zone(including groundwater transport) <br /> i <br /> ' This is a partial list of the main applications and limitations of the model <br /> • This model estimates the mass loading to groundwater from a vadose zone <br /> ' source The model accounts for source depletion due to volatilization and <br /> leaching The volatilization flux is only used to estimate losses from the <br /> source, it is not linked with an indoor or outdoor air model <br /> ' • This model does not simulate the movement ofNAPL(free phase product) It <br /> is a dissolved phase-only model Volatilization losses from the source are <br /> accounted for,however, the vapor phase concentrations with depth are not <br /> ' estimated The volatile losses are assumed to be instantaneous and <br /> irreversible <br /> 1 <br /> A-2 <br /> 1 <br />