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-14- <br />range. The long haul distances involved, whether by trucking or railroad, would be expensive. <br />Therefore, riprap is not considered practical for use as slope protection for large surfaces. It <br />may be economical for use in limited quantities. <br />Paving the upstrea case f thms with concrete is a viable alternative. `Concrete paving <br />has been utilized on ams 2 and 3. Nearby concrete sources- include North Platte in Nebraska <br />and Sterling or Julesburg in Colorado. For a large paving project, a portable batch plant can <br />be set up at the site. Though fine aggregate can be locally manufactured, coarse aggregate <br />may have to be manufactured or imported to the site. <br />The most viable alternative for slope protection would be soil cement facing. Soil cement is <br />a mixture of sand and cement. Local sources of sand can be utilized for the manufacture of <br />the soil cement. To offset the cost of the soil :cement, the, upstream slope of the embankment <br />can be steepened somewhat reducing: the amount of material needed for embankment <br />construction and offsetting some costs.- Based on our preliminary estimate, 9% to 11 % of the <br />cement by dry weight of the sand =will'`be required for the construction. The actual amount of <br />cement required will be based on the gradation and compaction characteristics of the sand and <br />cement. <br />7.0 ASSUMPTIONS INCORPORATED IN STUDY <br />A number of assumptions were incorporated into the analyses used in the preparation of this <br />report. The major assumptions are listed below. <br />1 . County roads would be relocated above the level of the flood pool. If the roads are <br />allowed to remain within the flood pool, relocated lengths could be significantly shorter, <br />and relocation costs reduced accordingly. <br />2. No evaluations or costs have been prepared in association with wetlands impact; right - <br />of -way acquisition for roads; for utility relocation; or property lease or purchase for dam <br />Zreports \97 -1 -500. n k <br />