C150008 Feasibility Study - Laserfiche WebLink

Home Browse Search

I I I I I I I I I I I I I I I I I I I OPINION OF COST The cost of each alternative was determined based on the quantities of work involved at a urtit price derived by input from Downey Construction, Montrose, Colorado; Farnsworth Construction, Hotchkiss, Colorado; and, based on our experience and costs on past dam projects including Twin Lakes Dam which was constructed in the mountains at elevation 9,200 feet in 1998. The quantities were determined by caIculating the earthwork volumes from surveyed cross sections of the dam provided by Consolidated Consulting Services. The breakdown of quantities and the estimated urtit prices for each alternative is shown in Tables 5 through 8. The following table provides a summary of the estimated costs for all alternatives and includes the estimated construction costs, engineering, legal fees, and contingency. The cost of the temporary breach, the breach investigation, temporary breach design, and interest on project loans is not included in Table 4, The cost per acre-foot is based on our analysis of the water storage as outlined on page 5 of this report. The water storage used for Alternative 2 is 375 acre-feet; for Alternative 3 the storage used is 800 acre-feet; and for Alternative 4 the storage used is 1600 acre-feet. This is based on the volumes determined form the survey of the reservoir which was partially full with water to elevation 8225 feet. TABLE 4 SUMMARY OF ESTIMATED PROJECT COSTS ALTERNATIVE ESTIMATED COST PER PROJECT ACRE-FOOT COST WATER STORED 1. Breach Dam $ 100,320 NA 2. Reduce Dam Height 10 Feet $ 769,622 $2,052 3. Maintain Dam Height $ 1,320,273 $1,650 4. Increase Dam Height 12 Feet $ 4,387,452 $2,742 Carl Smith Dam Feasibility Page 23