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total cost of the alternatives are discussed in the next <br />section. <br />In summary, Table 4 shows no significant economic advantage <br />favoring any specific one of the basic alternatives. <br />New Transfer Stations. Table 4 shows that if the proposed new <br />Harney Lane Landfill or the proposed central county landfill <br />is used, alternatives involving the construction of a transfer <br />station at Eight Mile Road and Highway 99 (A.2 and C.2) are <br />slightly more costly than alternatives which do not include <br />this proposed facility. If the Foothill Landfill is used, the <br />cost of the alternative with the proposed Eight Mile Road <br />facility (C.2) is about the same as the alternative without <br />the proposed facility (C.1). <br />In the case of the new Harney Lane and the proposed central <br />county landfills, the construction of a transfer station at <br />Eight Mile Road and Highway 99 does not appear to be <br />economically justifiable by this analysis. In the case of <br />Foothill Landfill, there is only marginal economic <br />justification for constructing the Eight Mile Road transfer <br />station. Furthermore, in no case would construction of the <br />Eight Mile Road transfer station result in significantly <br />reduced costs over the proposed project. This conclusion <br />should be regarded as tentative and subject to further study <br />when the 1979 SWMP is updated in 1983. <br />Sensitivity Analysis <br />Many of the costs presented in this section are based on <br />assumptions for certain cost items. A sensitivity analysis <br />shows how total costs for alternatives change when these <br />assumptions are changed. In general, sensitivity analyses are <br />9" <br />