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In addition to the main diversion on Canal No.1, water is also pumped into the ditch from a pump station located on the Colorado River near 29 Road. The pump is used during periods of high demand. The ditch has an earthen bottom and side slopes for approximately the first 3300 feet. Thereafter, it has a gunnite lining which was installed sometime in the 1960' s. The gunnite has deteriorated considerably, and substantial seepage occurs. 3. Prqject as Proposed hy NRCS NRCS has proposed installing a pipeline system to carry the irrigation water. The project has been completely designed, with plans and specifications, by the local engineering staff of the National Resource Conservation Service. This design was done as part of the Salinity Control Program. The total length of the project is 21,486 feet, which includes both pipeline and in-line structures (Figure V-A). The project will be bid in three separate phases, with each phase to be completed as funds are available. For Phase 1, NRCS has offered 3 material options: PVC pipe, polyethylene pipe or concrete pipe. Phase 1 covers the first 8,415 feet of the ditch. Phase 2 has options for PVC pipe and polyethylene pipe, and covers 5,315 feet of ditch. Phase 3 has options for PVC pipe or polyethylene pipe and covers 7,800 feet of the ditch. A breakdown of the pipeline sizes for each phase and for each pipeline option is shown in Table V-A. The Bid Schedule for the PVC option is shown in the Appendix. The Bid Schedule for the other pipe option is similar except that the pipe material and sizes are slightly different; however, pipe lengths, types of structures, number of side laterals, etc., will be the same for each pipe option. Take-out stations will be placed along the pipeline. These will consist of either concrete structures or yard taps. A concrete trash cleaning structure will be placed at the inlet. Overflow structures will be placed at critical locations along the pipeline. The system will also include air vents and flow meters. A typical drawing of the pipeline design, along with design details for the trash rack, overflow and take-out structures are shown in Appendix G. Sheet 30 shows the location of all the diversion points. The Contractor will be responsible for removing and disposing of the existing gunnite material in the ditch. The pipe will be buried approximately 3 feet The pipeline will operate primarily under pressure. V-2 I I I I I I I I t I I I I I I I t I I