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<br />1 <br />1 <br />I <br />1 <br />I <br />I <br />I <br />1 <br />I <br />I <br />I <br />I <br />I <br />I <br />1 <br />1 <br />I <br />1 <br />1 <br /> <br />Construction in this area is more difficult. In <br /> <br /> <br />noting Exhibit XI b., some rock can be anticipated. Additional <br /> <br /> <br />equipment will have to be used with a resultant increase in <br /> <br /> <br />the cost of construction. Most rights of way will have to be <br /> <br />pioneered, gradients steep and accessibility hampered during <br /> <br />times of wet conditions. <br /> <br />Alternate III will not remedy the problems of loss <br /> <br /> <br />of water during the course of traverse, nor the continual <br /> <br /> <br />strife of water modulation on the four miles of open ditch <br /> <br />from Beaver Creek to Lake Otonawanda. Correspondingly, opera- <br /> <br />tion and maintenance will be greater as this open ditch still <br /> <br />has to be maintained during all seasons. <br /> <br />The raw water will still present problems to the <br /> <br />filter with respect to contamination, high salts content, <br /> <br />colloidal suspensions (organic and inorganic) and an ever <br /> <br />varying quality. Filter media must be replaced and back flush- <br /> <br />ing required more frequently. <br /> <br />4. Alternate IV: (Exhibit XIII e.) <br />Alternate IV is basically the same as Alternate III <br /> <br />except a 6" diameter gravity line will be installed from Beaver <br /> <br />Creek at the diversion structure for the Ridgway Ditch and run <br /> <br />to the diversion structure in Cottonwood Canyon. At this point <br /> <br />the pipeline would become pressurized to create sufficient <br /> <br />pressure to operate the filters. Having a main diversion <br /> <br />structure on Beaver Creek and minor structures with piping to <br /> <br />Ridgw~y Spring #2 and #3, West Fork of Coal Creek (water rights <br /> <br />2'+ <br />