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A.4. <br /> City of Cortez Water Supply System <br /> The City of Cortez's water treatment system supplies potable water to the residents of Cortez <br /> plus the Ute Mountain Ute Tribe (UMUT) and Montezuma County Water District No. 1 <br /> (MCWD#1). The water supply is drawn from McPhee Reservoir situated on the Dolores River. <br /> The initial water delivery is provided by the Dolores Project facilities constructed by the <br /> Bureau of Reclamation and operated by the Dolores Water Conservancy District. Water is <br /> transferred from McPhee Reservoir through the Project's tunnel and then flows in a canal for <br /> about a mile to Cortez's 30-inch raw water pipe intake. The pipe line begins as a 30-inch <br /> transmission pipe for several miles then changes to a 24-inch pipe for the remaining distance to <br /> a 20 million gallon(MG) settling reservoir at the plant site. Water is then fed to the Cortez <br /> Water Treatment Plant through pipe lines from the reservoir. <br /> The Cortez Water Treatment Plant provides a series of treatment processes. The pretreatment <br /> processes include coagulation, flocculation, and sedimentation provided by an upflow clarifier. <br /> The treatment process is then followed by filtration through a multimedia granular filter or <br /> through a submerged membrane microfiltration system operating in parallel with the media <br /> filters. Final processes are chlorine disinfection and pH control provided as water leaves the <br /> Plant. Maximum treatment capacity is approximately 10 million gallons per day (MGD). <br /> Current peak day production is about 6.5 MGD with the average daily use of 2.6 MGD and the <br /> low winter demand of approximately 1.3 MGD. <br /> The Plant has three steel 2 MG water tanks for finished water storage. The upper two tanks <br /> closest to the plant provide storage to supply the UMUT's system. These tanks also supply the <br /> lower third tank which feeds the City of Cortez and MCWD#1. Cortez and MCWD#1 are <br /> served by three transmission lines to Cortez and then one transmission line from Cortez to <br /> MCWD#1 which abuts Cortez on the southwest corner of the City. UMUT's transmission line <br /> extends approximately 11 miles to Towaoc where it is stored in four tanks for use as needed. <br /> The City of Cortez has approximately 3,990 service connections consisting of single family <br /> residents,multi-family units, commercial users, and institutional users. The usage breakdown <br /> of the treated water between the three entities is 76% for Cortez, 20% for UMUT, and 4%for <br /> MCWD#1. <br />