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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />,I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />during summer months. Furthermore, the existing water delivery system is nearing the end of its <br />design life cycle. As these facilities age an increased rate of failure and escalating maintenance costs <br />are usually anticipated. The reliability of this water transmission system raises some concerns due <br />to the fact that the existing water delivery system is the only means of water transmission from <br />reservoirs to the treatment facility. Ceratin sections of the current water transmission system have <br />been identified as areas where possible failure will require extensive repair time. In particular, a <br />section of the raw water conveyance system which passes through the Plateau Canyon Tunnel, due <br />to its existing physical limitations, has been identified as an area which will be difficult and <br />inconvenient to repair in case of failure. <br /> <br />This study encompasses the technical, permitting, and financial advantages and disadvantages of the <br />Plateau Creek pipeline alternative, recommended by WEI in their October 1987 feasibility study, <br />versus a new tunnel alternative recommended by the SRKlBLI team. <br /> <br />2.2 Background <br /> <br />2.2.1 General <br /> <br />The District was formed on April 4, 1956, to provide potable water to the rural areas of the Grand <br />Valley, Colorado. The district is currently providing water to the Greater Grand Valley, Mesa <br />County Colorado excluding the municipal system service areas of Palisade, Clifton, and Grand <br />Junction. The district obtains water from two main sources: <br /> <br />. Plateau Creek Drainage Basin <br />The primary source of water is from the tailrace of Molina Powerplant. This water <br />originates in Big Creek and Cottonwood Creeks. During May through July, the <br />powerplant operates continuously. At other times of the year, the plant <br />intermittently produces peaking power. During this time, a maximum of 44 cfs may <br />be obtained. The district also has direct flow rights for 20 cfs from Plateau Creek <br />at the Molina Powerplant. Finally, through the purchase of ranch land, the District <br />acquired water rights in Coon Creek and Mesa Creek totalling 13.5 cfs. <br /> <br />. Colorado River <br />The district has water rights on the Colorado River for diversion of 14 cfs. <br /> <br />Initially, the district provided service to 1802 customers conslstmg of 624 agricultural, 1,127 <br />residential, and 51 commercial/industrial water users. Since then there has been a considerable <br />growth in the number of customers and the District service area. The usage demand has changed <br /> <br />4 <br />