The number of waste packages within an eruptive conduit is assumed to be simply a function of conduit area and the average waste package density within the repository. No attempt is made to specifically determine or assign where a conduit occurs in the repository. If the conduit occurs in the repository, the number of waste packages hit is determined by multiplying the conduit area by the calculated waste package density factor, which is the total number of w,aste packages divided by the total repository area. Although magma associated with an eruption may contact other packages along the drift, the magma moving with sufficient vertical velocity to entrain waste in an eruption is assumed to be located only within the conduit because if additional waste packages outside of the conduit profile fail, then this simplified calculation approach would not be viable.