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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />A feasibility-level design for rehabilitating Twin Lakes Dam was elaborated <br />based on the alternative selected. Design computations were refined, and <br />drawings prepared. A construction cost estimate was developed by <br />recalculating quantities and reviewing unit costs. The estimated <br />construction cost for rehabil i tati ng and enl argi ng Twi n Lakes Dam, i ncl udi ng <br />a 15 percent contingency, is $627,107. <br /> <br />Total project costs were developed by addi ng the cost of the feasi bi 1i ty <br />study to the estimated cost for engineering and construction management, <br />allowing for cost escalation due to inflation, and computing interest during <br />project execution. The total estimated cost to rehabilitate and enlarge Twin <br />Lakes Dam so that it can operate to its full decreed capacity of 460 <br />acre-feet without restriction, is $824,425. This amounts to a unit cost per <br />acre-foot of total storage of $1,792 and a cost of $1,816 per acre-foot of <br />firm annual yield. These unit costs are compared in the following table with <br />the estimated total costs to rehabi 1 itate Peterson Lake and Comanche Dams. <br />Replacement of Twin Lakes Dam with an RCC structure would decrease the annual <br />O&M Cost by an estimated $4,000. <br /> <br />========================================================================================= <br /> <br /> ESTIMATED UNIT COST <br /> UNRESTRICTED FIRM ANNUAL TOTAL UNIT COST FIRM ANNUAL <br /> STORAGE CAPACITY YIELD PROJ ECT OF STORAGE YIELD <br /> PROJECT (Acre-Feet) (Acre-Feet) COST ($) ($ Ac-Ft) ($ Ac-Ft) <br />Comanche Dam 2,629 1,770 1,724,286 656 974 <br />Peterson Dam 1,252 1,01 0 756,312 604 749 <br />Twin Lakes Dam 460 454 824,425 1,792 1,816 <br /> , <br /> <br />========================================================================================= <br /> <br />An al ternati ve to rehabil i tati ng Twi n lakes Dam woul d be to purchase CBT <br />water at approximately $1,070 per acre-foot of yield. Since this water can <br />only be del i vered in the summer, when CBT faci 1 Hi es are operati ng, thi s <br />source of water is not comparable, as Twin Lakes Dam will allow releases <br />throughout the year. Another alternative is to construct Rockwell Dam on the <br /> <br />ix <br />