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II I I I I I I I I I I I I I I I I I I 3.0 CORTEZ-TOWAOC PIPELINE 3. 1 General The principal feature of the Towaoc Municipal Project is the pipeline to convey water from the City of Cortez treatment plant to the Town of Towaoc. The straight line t:!istance between the point of origin to the terminus of the pipeline is 16.5 miles. The length of the final design alignment ultimately selected will obviously be greater than that, depending on the final route selected. There is a wit:!e range of excavation conditions along the way, ranging from rock to swamps, and also great variation in land use, including residential, commercial, irrigated agricultural, and range land. During the initial years of pipeline operation the Tribe's water will be treated by the City of Cortez and the enti re 1 i ne and termi nal storage near Towaoc will contain treated water. Either the Tribe or the City of Cortez may terminate the treatment agreement, in which case the Tribe would probably build a treatment facility on the Reservation. The pipeline would then be converted to a raw water 1 i ne hy tyi ng di rectly into the Dolores Canal/Co...tez supply 1 i ne. There is adequate capac i ty to serve both the Ci ty of Cortez and Towaoc through this 3.5-mile pipeline, which is ~4 and 30 inches in diameter. While available terminal storage volume is a factor in sizing the pipeline for ultimate use, the additional storage does not have to be added at the present time in order to serve the existing municipal demands. Alternatives \'/hich include additional storage facilities ant:! create several pressure ant:! service zones in the Towaoc region have numerous advantages, and will be addresset:! in Chapter 4.0 as possible Towaoc municipal improvements. This chapter presents the basis for the feasibility t:!esign of the pipeline and includes alignment alternatives, pipe sizing, suitable pipe types, controls and metering, and cost estimates for making comparisons among design options. 3-1 1060c