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<br />. <br /> <br />.J r, ~.' (~ <br />f.. v i ...: <br /> <br />Riprap <br /> <br />Three sources of riprap are being considered for Narrows Dam. <br />These are Fremont Butte, 3 to 4 miles northwest of Akron, Colorado, <br />the southwest Akron area, 8 to 9 miles southwest of Akron, Colorado; <br />and the Golden area. Quality of Rock tests and haulage cost studies <br />indicate that the Golden area--Ralston Quarry--is preferred over the <br />Fremont Butte and Akron areas, Utilization of the Ralston Quarry <br />will require transportation of the material about 100 miles to the <br />Narrows damsite. <br /> <br />Road and Highway Material <br /> <br />Suitable material for road and highway construction is <br />available in the construction area. In 1950, there were located <br />in the construction area, three sand and gravel pits used by the <br />county and one used by the State Highway Department, as well as two <br />State-approved pits for sandy-clay binder material, Since these <br />particular sources of material may no longer be available, additional <br />investigation for road and highway materials may be necessary. <br /> <br />. <br /> <br />Railroad Ballast <br /> <br />Suitable material for railroad ballast to be used in relocating <br />the Union Pacific Railroad is not available in the area. Types of <br />ballast acceptable to the railroad company are smelter slag and <br />granite. The railroad has expressed a preference for use of granite <br />from their own Sherman Hill Quarry, located in Wyoming, 126 miles <br />from Fort Morgan, Colorado. <br /> <br />Field Surveys <br /> <br />Topography of the reservoir site and railroad relocation on <br />a scale of 1" = 400' with a 5-foot contour interval and detailed <br />topography of the Narrows Dam site on a scale of 1" = 200' with a <br />2-foot contour interval has been surveyed in the field. Horizontal <br />control surveys consist of triangulation and traverse tied to the <br />United States Coast and Geodetic Survey triangulation net. Posi- <br />tions have been computed in the Colorado State Plane Coordinate <br />System, North Zone. Vertical control surveys were tied to the <br />United States Coast and Geodetic Survey level net. <br /> <br />. <br /> <br />A cadastral re-survey was made of the reservoir and rail- <br />road relocation areas by the Bureau of Land Management. Section <br />and outside quarter corners were established and monumented for <br />163 sections of land in 10 townships. Center quarter corners <br />were established and monumented in 46 of these sections, generally <br />along the railroad relocation routes. <br /> <br />5 <br />