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Table 1. Estimated versus Final Cost Summary
<br />Item Estimated Cost Final Cost
<br />1. Reservoir Construction (51 acre-foot) $585,000 $2,312,500
<br />2. Land Acquisition (4 acres) $235,000 $220,000
<br />3. Pump Station ,Stream Diversion, & Pipeline $640,000 $840,000
<br />4. Infiltration Gallery $320,000 $71,000
<br />5. Water Rights Purchases (CBT Shares) $1,000,000 $251,000
<br />6. Administrative and Legal Fees $18,000 $35,000
<br />7. Engineering and Project Inspection $106,425 $330,000
<br />8. Prior Planning Expenditures to DMP $62,380 0$
<br />Total: $2,711,805 $4,059,_500
<br />The loan amount of $2,033,850 approved by the CWCB in July 2004 was based on 75% of the total
<br />estimated project cost of $2,711,805, as identified above.
<br />To-date, the District has completed the installation of the distribution and fill pipeline, the stream
<br />diversion and the pumping station, at a total cost of approximately $1,149,500, which includes a portion
<br />of the estimated administrative, legal and design fees identified above. The remaining items to be
<br />completed include finalizing the land acquisition for the reservoir, State Engineer Office (SEO)
<br />approved reservoir construction, and the purchase of CBT water shares, at a total cost of $2,910,000.
<br />This is based on an estimated land acquisition cost of $220,000, a final design, inspection, testing and
<br />construction cost of $2,439,000 to complete the reservoir, and an estimated $251,000 in CBT water
<br />share purchases. Based on these revised numbers, the new total project cost is $4,059,500, which is an
<br />increase of approximately $1,347,700 from the original estimate. The District originally estimated
<br />$1,000,000 to purchase CBT water shares. Given the final cost of the project and the maximum
<br />projected indebtedness of the District of $3,890,000, the District is limited to approximately $251,000 in
<br />available funds for CBT water share purchases. The $251,000 in water purchases is contingent on the
<br />District receiving $400,000 from a combination of a grant from the State's Water Supply Reserve
<br />Account and/or District land sales The grant request has been submitted to the State and will be
<br />reviewed by the South Platte Basin Round Table on March 11, 2008.
<br />Discussion
<br />The main contributing factor for the extensive cost overrun to the project was the construction of Crow
<br />Lane Dam. The initial planning study for the reservoir identified a 35 foot high dam, without
<br />accounting for any spillway cost in the overall dam estimate of $585,000. During the final design the
<br />SEO minimum 5 foot freeboard requirement was incorporated, increasing the dam height from 35 feet to
<br />40 feet. Additionally, the quality and location of the bedrock resulted in a modification to the
<br />engineer's original spillway design. The SEO was concerned that the quality of the rock would not
<br />withstand long term freeze thaw cycles and that the proposed curved spillway might not be able to
<br />maintain the required freeboard. This resulted in a concrete labyrinth spillway design, enclosed with
<br />10-12 foot high concrete walls, with a concrete stilling basin. These design changes resulted in an
<br />increase of approximately $1,000,000 to the project.
<br />J
<br />Flood Protection • Water Project Planning and Financing • Stream and Lake Protection
<br />Water Supply Protection • Conservation Plaxu~ing
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