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<br /> <br />, <br /> <br />000536 <br /> <br />.' <br /> <br />Recent detailed foundation drilling at the previously <br />considered damsite disclosed that the glacial moraine materials <br /> <br /> <br />forming the site are more pervious than indicated by previous <br /> <br /> <br />investigations and that considerable costs would be involved in <br /> <br /> <br />preventing excessive leakage of water from the reservoir, Drilling <br /> <br /> <br />at the site proceeded to a maximum depth of 394 feet without reaching <br />bedrock. <br /> <br />~ <br /> <br />Because of these factors, consideration was given to three <br /> <br />other downstream alternative sites for the reservoir. For purposes <br /> <br />of easier identification and reference, the original site is referred <br />to as the Moraine Axis, and the other sites a6 the Dallas Confluence, <br /> <br />Alkali Creek, and Cow Creek axes. <br /> <br />Before hydraulic pumping of water from Ridgway Reservoir <br />was eliminated from the plan, additional storage and higher pump <br />lifts would have been required at the lower sites because of the lower <br />elevations of the alternative reservoirs, <br /> <br />With elimination of the pumping requirements the lower sites <br /> <br /> <br />became relatively more attractive, Other advantages and disadvantages <br /> <br /> <br />of the four sites are listed as follows: <br /> <br />. <br /> <br />5 <br />