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. . . - ." G ,^ ......; ....i Construction Materials Volume II, Part 2, of the Narrows Unit Definite Plan Report, dated June 1951 gives in detail t~e results of laboratory tests and locations of suitable embankment materials and should provide all information required for final design. Copies of this report are on file in the libraries of Region 7 and the Chief Engineer. Inasmuch as considerable time has lapsed since the material investi- gations were accomplished in 1950, additional investigations may be necessary to establish the final location of the materials needed for construction. The types of construction materials on which investigation studies have been conducted are as follows: Embankment Materials Laboratory tests on embankment materials were made in the Fort Morgan office and in the laboratories of the Chief Engineer, Denver, Colorado. Materials in the proposed borrow areas are suitable, and sufficient quantities are available in the vicinity of the dam for impervious and pervious embankment and the downstream blanket of topsoil, Pervious Blanket Material Coarse pervious material is not available in the immediate vicinity of the dam. Reconnaissance testing for this material revealed two promising sources 11 and 13 miles from the damsite. Sufficient material is estimated to be available from these two sources for the gravel blanket under the riprap and, with some selection in the areas, no processing would be required. Concrete Aggregate Fine concrete aggregate material is to be found in the flood plain of the South Platte River both upstream and down- stream from the damsite, The maximum haul distance for this material is approximately three miles. Coarse concrete aggregate material is not available in the vicinity of the dam. Satisfactory sources have been located at Greeley and Clear Creek between Golden and Denver, Colorado. Another source to be considered is at Big Springs, Nebraska. 4