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I I I I I I I I I I I I I I I I I I I 3.0 CORTEZ-TOWAoe PIPELINE 3.1 General The principal feature of the Towaoc Municipal Project is the pipeline to convey water from the City of Cortez treatment pl ant to the Town of Towaoc. The straight line distance 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 wide 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. Ouring the initial years of pipeline operation the Tribe's water will be treated by the City of Cortez and the entire line and terminal 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 by tyi ng di rect1y into the Oolores Canal/Col"tez supply line. There is adequate capacity to serve both the City of Cortez and Towaoc through this 3.5-mile pipeline, which is ~4 and 30 inches in diamet~r. 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 and create several pressure and service zones in the Towaoc region have numerous advantages, and will be addressed in Chapter 4.0 as possible Towaoc municipal improvements. This chapter presents the basis for the feasibility design 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 l060c