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RISC Manual Version 4 0 <br /> Receptor Location <br /> ilizY"' v+ �•w`xt���c�`9�''[[�='�'t+'1E�3 w.sa� y► , 10. :� <br /> Optional <br /> F Lens <br /> �N,� i'�.��a�i�`ate �Fr���� !'`�•°��'`¢���+��w <br /> fo <br /> � csR� R �R♦� ��*s+A� Y���eS�iR��a Yc� <br /> yl-;,pry��"'�► <br /> Capillary <br /> Fringe <br /> Source <br /> Figure E-1 Schemabc of the Vapor Transport Model from Groundwater into <br /> Buildings <br /> c <br /> E.2 A-MR-K CAT ONS`af TH15 IIAODEL ° }, F _ _s _ tr <br /> This is a partial list of the main applications of the model <br /> • The source is assumed to be in the groundwater only If the original source <br /> were in the vadose zone and the volatilization to indoor air pathway is being <br /> evaluated for a building close to the source,the soil to indoor air pathway will <br /> dominate the risk <br /> • The source size is assumed to be as large or larger than the footprint of the <br /> building <br /> • The chemicals must diffuse out of the groundwater,through the capillary <br /> fringe and through the vadose zone before reaching the budding If <br /> contaminants are located above the water table(e g the water table has <br /> dropped considerably and residual product is left in the vadose zone)then one <br /> of the soil vapor models should be used <br /> • If soil vapor concentrations have been measured above the water table and are <br /> to be used as the source term, one of the volatilization from soil models should <br /> be used <br /> E-2 <br />