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I I I I I I I I I I I I I I I I I I I ~~~ r-- .---- ._----........,-~-_.. -2- " ,... lU J '-' 1. Drawing No. 553-B-19 entitled, "Reconnaissance Design Drawing, Weld County Dam - Lower Axis". 2. 3. Reconnaissance Design Drawing, Narrows Dam. Reconnaissance Estimate Sheet (Dam's Branch), Weld County Dam - Lower Axis. 4. Reconnaissance Estimate Sheet (Dam's Branch), Narrows Dam. 5. Summary of Total Costs - Narrows and Weld County Dams and Reservoirs (U.S.B.R.). l" ..... The "Summary of Total Costs" prepared by the U.S.B.R. indicated that the cost of the dam, spillway, and outlet works at the Weld County site was more than $26,000,000 higher than the cost of the , I i[ dam, spillway,and outlet works at the Narrows site. The spillway and outlet works for the two sites were essentially the same so that the difference in cost was attributable to the difference in cost of the dam proper. Because of this, we were asked to confine our review to that of the dams themselves. The comparative costs for right-of-way, road and railroad relocation and other necessary work are being prepared by others. We have assumed that the dam embankment elevations given by the U.S.B.R. are proper to accomplish the purpose desired. These are controlled by the overall project planning which is beyond the scope of our work. Design of Dam at Lower Weld County Site Drawing No. 553-B-19 reflecting U.S.B.R. criteria for the design of the dam shows a complete cutoff to bedrock throughout the entire length of the dam, including a slurry trench cutoff in the deep "buried channel". The buried channel begins about 100 feet below natural ground and extends to about 160 feet below ~(J '~.~r Y [I . ,,' ".'"L ...t; r \ ;r' A' I .