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Capital cost estimates are based on unit prices developed using contractor's cost <br /> estimating reference guides (R S Means & Co , 1992 and 1994) Published unit prices were <br /> escalated for regional variation as recommended, and for inflation where applicable Indirect <br /> capital costs (engineering design, permitting, and construction management) were estimated as <br /> a fixed percentage of direct capital costs All capital cost estimates include a 30%4 contingency <br /> to account for the uncertainty associated with a predesign level cost estimate and potential <br /> uncertainty in the extent of impacted soils <br /> Annual O&M costs were estimated based on the assumption that a consultant or qualified <br /> icontractor would perform these services for AFPC Equipment O&M costs are estimated as a <br /> fixed percentage of equipment capital costs Annual monitoring and reporting costs were also <br /> estimated based on the assumption that the work would be performed by a consultant <br /> The Net Present Worth of each remedial option was then calculated using a discount rate <br /> of 7% The following table summarizes capital, O&M, monitoring, and Net Present Worth <br /> costs for each of the nine remedial options Economic analysis spreadsheets indicating the <br /> yearly allocation of expenditures are included in Appendix B <br /> SAC 127 10 24 <br /> ' DAMES &.MOORE <br />