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Table E2. Opinion of Probable Cost Summary
<br />Cost Summary for Combinations of Dam Configurations and Conveyance Options
<br />Total Cost
<br />O 6on Reservoir Annual Yield Dam Cost Conveyance i Unit Cost - Onit Cost -
<br />P Size AF 4F/ r Cost O&VI Cost (Dam+
<br />� ) (- Y ) Storage ($/AF) Yeild (�/AF/yr)
<br />Conve ance
<br />I A 154,000 132,000 $278,000,000 $514,000.000 $792,000,000 $5,100 $6,000
<br />1 B 154,000 132,000 $278,000,000 $406,000,000 $684,000,000 $4,400 $5.200
<br />1C I54,000 132,000 $278,000,000 $51,000,000 �336_OOQ000 $665,000,000 $4,300 $5,000
<br />2A 39,800 54,500 $148,000,000 $41Q000.000 $558,000,000 $14,000 $]0,200
<br />2B 39,800 54,500 $148,000,000 $206.000.0�0 $354,000,000 $8,900 $6,500
<br />2C 39,800 �4,500 $148,000,000 $30,100,000 $159,500,000 $337,600,000 $8.500 $6,200
<br />�Annual O&M Cost for Options l C and 2C include present value costs for power usage, pump station maintenance (estimated as a percentage of capital cost)
<br />and pipeline maintenance
<br />Alternative 1 A is comparable to the configuration in the Clay Report. With an estimated total
<br />construction cost of approximately $790 million, this opinion of probable construction cost is
<br />approximately $300 million higher than the $494 million estimate in the earlier report (and this is
<br />without additional water delivery infrastructure from the reservoir to the end water users that were
<br />included in the Clay Report).
<br />The economic and financial feasibility of hydroelectric power generation using releases from Grand
<br />Valley Lake were not quantified in this study. Potential revenues may be sufficient to offset additional
<br />costs for a turbine, generator, transmission lines, distribution system interconnection, controls and
<br />reservoir outlet modifications if a relatively long repayment period is acceptable and/or sufficient
<br />renewable energy credits could be obtained. Based on experience with the development of many other
<br />hydroelectric facilities in Colorado and the Western U.S., the Study team is not optimistic that a
<br />hydropower installation at Grand Valley Lake would be economically attractive and any quantitative
<br />analysis should be deferred until more is known about Project operational scenarios, in particular,
<br />whether reservoir releases would be relatively uniform month-to-month and year-to-year or whether
<br />they would vary significantly. The greater degree to which the reservoir may be used for long-term
<br />drought protection (versus base flows for environmental or other purpose), the less feasibility it would
<br />be to add hydropower to the project.
<br />AECOM
<br />2/22/10
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