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<br />. <br /> <br />. <br /> <br />'~fb8~tted and during periods when the reservoir level fluctuates. <br /> <br />However, this is not an unusual condition for reservoirs in soft <br /> <br />rock, and it is difficult to believe that it can occur to a degree <br /> <br />which will impair the capacity or functioning of the reservoir. <br /> <br />Study of the reservoir basin and surrounding areas shows <br /> <br />that there have been landslides in the past and suggests that <br /> <br />others will occur whether there is a reservoir there or not. The <br /> <br />presence of the reservoir can be expected to facilitate such oc- <br /> <br />casional slides, but there is no evidence to suggest that slides <br /> <br />will occur of such magnitude as to impair the reservoir or threaten <br /> <br />the safety of the dam. <br />Drilling and surface examination of the damsite reveals that <br /> <br />the dam will be built totally within the Maroon formation and that <br /> <br />the top of the gypsum lies more than 1,000 feet below the ground <br /> <br />surface at the axis of the dam. The character of the gypsum could <br /> <br />not, in the writer's opinion, affect the stability of the dam. The <br /> <br />structural attitude of the Maroon beds, their jointing and structure <br /> <br />patterns and their degree of hardness and bearing capacity are <br /> <br />similar to many other damsite foundations that have been success- <br /> <br />fully used. The problems of stability involved in constructing <br /> <br />an earth dam at this site are of engineering nature rather than <br /> <br />geological and are solvable by normal engineering procedures. <br />Leakaqe <br /> <br />If leakage is to become a problem at a reservoir site, the <br /> <br />water must have both ingress to the reservoir foundation and egress <br /> <br />- 8 - <br />