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~ n" ., ~u;).i.. -4- distance. We have assumed that tbe local dune sand and other silty and sandy materials available along the axis would reduce I , I I I I I I I I I I I I I I length of baul to 1 mile average and that excavation will be above water table and quite economical for the major volumes involved. The attached Figure I shows the maximum embankment section and criteria utilized by our firm in the cost estimates for Lower Weld County Dam. We have used the U.S.B.R. unit costs, except where we disagree substantially. Table 2 attached shows the de- tails of the estimates indicating that the total field cost for the dam, spillway, and outlet works at the Lower Weld County site would be approximately $27,660,000. Design af Narrows Dam We have reviewed the design and cost estimate by the U.S.B.R. for the dam at the Narrows site on the same basis as the Weld County site. We essentially agree with the estimate as given, except that, in our opinion, blanketing of the right side of the reservoir- would be- requirecC for -3 -cons f<leraoIe llisU-n(fe-\1pstream- - - for stability reasons. However, if the blanketing is included as has been done in our estimate, we believe that the drain wells included in tbe U.S.B.R. estimate for control downstream of the dam would not be necessary. These essentially balance so that the cost differential between the U.S.B.R. estimate and that made by our firm is minor. Details of the estimates are given in the attached Table 3 shOWing that the total field cost for the dam, spillway, and outlet works,~~"~<<.,~rrDWs site would be approxi- , .._--~; mately $16,000,000. ".}.::~;,c.'/'';.;.;Z''''''' BY '" \1YD.&&.. & ,G " .' / o~ i~go~f~ "1:!OOol.o.I1t).(;L l ef ~Hf<l""O /IItf.[I_A~S'1t!J{.. 1 E \ .. ..~1' .<';.;: . { -;. y~'