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I I I I I I I I I I I I I I I I I I I B. ESTIMATED COSTS Table IX lists the estimated costs for the proposed improve- ments on the main stream and south tributary. These costs are broken down into categories to allow for better analysis of the distribution of costs. No costs have been allocated to flood control and flood plain zoning programs or flood insur- ance acquisition. These items have certain costs for imple- mentation, however. The costs for flood management programs . is presumably undefineable. The cost of insurance is not a City cost but is borne by the private property owner. TABLE IX SLAUGHTERHOUSE GULCH Estimated Costs Items Cost South Tributary Cost Main Stream Channel $110,400 150,200 10,400 $ 8,000 94,700 o Street & Crossing Improvements Right-of-Way Total Estimated Construction Cost $271,000 $108,400 $379,400 $102,700 $ 41,100 $143,800 Contingency 40% Total Estimated Project Cost C. REVIEW OF ESTIMATED COSTS The final estimated costs are generally somewhat higher than those estimated in the Interim Report. Table X compares the Interim Report estimate cost to the preliminary design detailed cost estimates. The cost estimates are based on present day construction costs for large scale public works projects; A large contingency cost has been used in the estimate to allow for engineering, legal and fiscal costs as well as unidentified utility problems and possible additional construction problems along the Denver Water Board 60-inch conduit alignment. Costs may be expected to increase if the project is phased over an extended period of time in small portions. Many costs included in the estimate may never be necessary as a cost sharing basis with the private developer may help to pay for some of these improvements. X-2