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<br />.,
<br />
<br />to District. As such, the District will be the contracting entity for the CWCB loan, and a special
<br />agreement among the three parties is being drafted which specifically addresses loan
<br />responsibilities.
<br />
<br />.
<br />
<br />Prewitt Reservoir is an off-stream reservoir constructed in 1910-12, located primarily in
<br />Washington County, with a portion ofthe dam in Logan County. The dam is a Medium Size (<
<br />50,000 AF), Class 1 Dam (loss oflife expected in the event of failure), with a dam height of36
<br />feet, and a dam length of 3.5 miles. The maximum storage is 32,300 acre feet (GH 28.0), but the
<br />reservoir is currently restricted to 28,600 acre feet (GH 26.5). The reservoir has a surface area of
<br />2,300 acres at the restricted level.
<br />
<br />The intent of this project, as approved by the Board in May of2006, is to maintain the District's
<br />current storage level of28,600 acre-feet by constructing an emergency spillway. Without this
<br />improvement, the State Engineer's Office may further restrict the reservoir. Improvements to the
<br />dam's stability and seepage, at a future date, could completely remove the storage restriction by the
<br />State Engineer's Office, allowing the District to store its full capacity of32,300 acre-feet.
<br />
<br />James Yahn, P.E., the District Manager, completed the feasibility study for the project in March of
<br />2006. The following is a summary ofthe construction costs presented within the original
<br />feasibility study, as provided by W.W. Wheeler and Associates, Denver, Colorado:
<br />
<br />Item
<br />
<br />Cost
<br />
<br />1. Furnish and Place 250- ft. 72-inch RCP
<br />2. General Excavation - 12,000 c.y.
<br />3. Structure Concrete - 300 c.y.
<br />4. Backfill Concrete - toO c.y.
<br />5. Vent pipe
<br />6. Furnish and Place Pipe Bedding - 170 I.f.
<br />7. Furnish and Place Riprap Bedding -150 C.y.
<br />8. Furnish and Place Riprap - 275 c.y.
<br />9. Furnish and Place Log Boom
<br />10. Engineering/Over-site
<br />11. Contingency
<br />12. Other
<br />
<br />$100,000
<br />$24,000
<br />$105,000
<br />$25,000
<br />$1,000
<br />$5,950
<br />$3,750
<br />$13,750
<br />$13,000
<br />$15,000
<br />$30,645
<br />$0
<br />
<br />Total:
<br />
<br />$337,095
<br />
<br />Increase
<br />
<br />$118,000
<br />
<br />$83,000
<br />
<br />.
<br />
<br />$17,540
<br />
<br />$218,540
<br />
<br />In August of2006, the District received bids from Concrete Specialties, Sterling, Colorado, for
<br />$536,009 and from Yost Construction, Sterling, Colorado, for $555,635 to complete the work. The
<br />District Board is electing to award the work to Yost Construction, since they had no conditions or
<br />qualifications on their bid (i.e. dewatering, permits, rip rap, etc.). Therefore, based on a bid of
<br />$555,635, the total increase to the cost of the project is $218,540. Based on the review ofthe bids
<br />received by the Engineer, project location, and overall contractor availability, the District did not
<br />feel that re-bidding the project would prove advantageous.
<br />
<br />The two items that were significantly higher then the original estimate were the 250-feet of 72-inch
<br />reinforced concrete pipe (RCP), and 300 cubic yards of structural concrete. The 72-inch RCP came .
<br />in $118,000 higher then estimated and the structural concrete came in at $83,000 higher then
<br />estimated. These two items accounted for $201,000 of the $218,540 in added construction costs,
<br />which can be attributed to higher material and fuel costs since the May 2005 construction estimate,
<br />project location, and contractor availability.
<br />
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