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<br />000053 <br />r=- <br />:1 <br />il <br />~' ii' <br /> <br />'" <br />il <br />'I <br />, <br /> <br />-23- <br /> <br />a ~oned cmbankment has been made. The major categories of ma- <br /> <br />toria1s al'C: (1) Aeolian deposits consisting of dune sands and <br /> <br />silts witl] minor amounts of clay which are available in the iOl- <br /> <br />mediate vicinity of the dam site; (2) flood plain alluvium con- <br /> <br />sisting of relatively fine sand-gravels with minor silts and <br /> <br />I clays available in the inullediatc vicinity of the dam site; and <br />I <br />',I <br />(3) impl.'rvious clays approximately seven miles upsh'eam of the <br />I <br />ri axis in all area sufficiently large for exploitation and placement <br />,I <br />:1 i,l an impervious zone, These latter materials lIa ve been tested <br /> <br />in the laboratury and found tu be very impervious after compaction, <br /> <br />adequate.' for a thin central zone wllic]] would provide an excellent <br /> <br />water barl'icr within the embanJ,ment. The locations of test holes <br /> <br />and logs of materials found are given in ~igures 5, 6, 7, and 8, <br /> <br />attached. <br /> <br />The total volume of embanl<llll.mt would be of the order of <br /> <br />l2,700,000 cubic yards not L]cluding cutoffs. Approximately <br /> <br />1,750,000 cubic yarcls of this would be placed in the central im- <br /> <br />pervious core assuming a section as indicated in Figure 10, which <br /> <br />we believe would be reasonable. The remainder of materials for <br /> <br />the emllanJ(lllent, inclucling the pervious zones would be obtained <br />I <br />,I from convenient locations near the clamo The major items of extra <br /> <br />cost for the Weld site <br /> <br />shown below. <br /> <br />Weld <br />County <br />-- <br /> <br />arC,;! <br /> <br />Est. <br />Unit <br />Cost <br /> <br />Cost <br />Difference <br /> <br />Total <br /> <br />Narrows <br /> <br />Difference <br /> <br />Lmb. Volume <br />(~o Cutoff <br />or Drains) 11,420,000 <br /> <br />Overhaul (6 mil <br />(Clay borrow) <br />(N"ot inc lucling <br />1 mile avg. haul <br />both site,s) <br /> <br />12,730,000 <br /> <br />1,310,000 .44 <br /> <br />+$580,000 <br /> <br />1,750,000 <br /> <br />1,750,000 .50 <br />Total <br /> <br />+$875.000 <br />$1,455;000 <br />