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<br />The Rockfill Dam with Impervious Core is recom- <br />mended because of its lower cost. The availabil- <br />ity of materials as determined by the soils inves- <br />tigations may result in an alternate choice. <br /> <br />The extremely short construction season result- <br />ing from the high altitude of the site may have an <br />adverse effect on the construction costs. The speed <br />of construction may require additional equipment <br />that would not ordinarily be required or the con- <br />struction may require two construction seasons. <br /> <br />D. Alternatives Considered <br /> <br />In the preliminary stages of this study, alter- <br />native size and location for the proposed dam were <br />considered. A 1000 acre foot structure was considered <br />at the proposed site with the result that a 2000 <br />acre foot structure would be more cost effective. <br />In addition, analysis of the water requirements shows <br />that a 1000 acre-foot structure would not meet the <br />needs of this project. An alternative site was <br />considered at the same location in which the USPS <br />gaging station on Arapahoe Creek was installed. The <br />cost of excavation at this site caused it ,to be ,:'1 <br />eliminated from consideration unless a reservoir <br />of over 4000 acre feet capacity were to be developed. <br />There is insufficient surface water to fill a reser- <br />voir of this size at that location. <br /> <br />:1 <br /> <br />"'1 <br /> <br />'~" I <br /> <br />i <br />, <br /> <br />-37- <br />