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-3- <br />• <br />is primarily designed to detain water to allow sedimentation to occur. <br />According to the hydrology and flood routing study, if the PMP should <br />occur, it will take approximately 35 hours to drain the water from <br />the maximum water surface elevation to elevation 6938. In the 100-year <br />event, it will take approximately 26 hours to drain the water from <br />elevation 6942.8 to elevation 6938. <br />The design life of the structure is estimated to range from 15 to <br />20 years. For most of the design life of the structure the maximum <br />head will be on the order of 8 feet. For purposes of this design <br />and analyses, we have assumed that saturation could occur in the struc- <br />ture up to the level of the 10-year, 24-hour precipitation event (eleva- <br />tion 6938). <br />C~ <br />GEOLOGIC SETTING <br />General geologic conditions in the area were provided by Energy <br />Fuels geologist. The site is underlain by Upper Cretaceous <br />sediments. Within the area of proposed construction, the site is <br />underlain by the Williams Fork Member of the Mesa Verde Formation. In <br />the area of the proposed dam construction the Williams Fork consists <br />primarily of a massive marine shale member that is predominantly a clay- <br />stone, with some silts tones. <br />SITE CONDITIONS <br />The site is located south and west of the local prominent hill known <br />as "Pinnacle Peak". At the present time there is a haul road to the <br />• <br />