WSP02926 - Laserfiche WebLink

Home Browse Search

I I I I I I I I I I I I I I I I I I I SCOPE OG02 This repart presents results of comparative cost estimates for an earth dam at two alternative sites; (1) the Lawer Weld County site near Hardin, Colorado, and (2) the Narrows site near Fort Margan, Colorado. In our Report No. 7547-7354 dated March 11, 1964, covering engineering and geologic investigations at the Lower Weld County site, our opinion was given that from the engineering and geolagic viewpoint, the Weld County site is superior to the Narrows site. It was recammended that the Bureau make comparative cost estimates of construction at these two sites. The U.S.B.R. has completed the estimates for both sites, and we have reviewed the design and estimates. The basic conclusions resulting from our review are listed briefly below followed by a discussion of criteria and assumptions for the estimates made by our firm. SUMMARY OF CONCLUSIONS (1) Tbe total yardage of compacted materials required for the dam and foundation at the Narrows site is 7,400,000 cubic yards while that required at the Lower Weld County site is 17,600,000 cubic yards. Both of these are based on the assumption that the crest elevations presently planned and furnished us are correct, i.e.; elevation 4610 for the Lower Weld County site and elevation 4448 for the Narrows site. (2) In our opinion, the cost of the dam praper at the Lower Weld Caunty site will be approximately $11,000,000 higher (field cost basis) than the dam at the Narrows site. The influence af the dam cost on the cost of the overall project utilizing U.S.B.R. figures and including U.S.B.R. indirect costs is shown in Table I attached. DISCUSSION Data Furnished by U.S.B.R. Follawlng is a list of U.S.B.R. data utilized for the estimates made by our firm: .C')[>."'.' ( l '1', ,." g~'lr &r.[ ~'.\u"" ~ I F \