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Section 5 Addressing the Water Supply Gap Technical Roundtable Raw ~5~1'8 Potable M&I Use Figure 5-17 Schematic of Conjunctive Use of Surface Water and Groundwater/ASR Conceptual layouts of piping infrastructure for the South Platte could run from the Greeley, Weldona or Sterling areas north to the South Metro Gap area as depicted in Figure 5-18. This route could allow a tie-in to existing and planned pipelines from the Brighton area to the South Metro area. Elevation profiles for the conceptual pipeline alignments were developed and are shown in Figure 5-19. The total elevation gain for the South Platte pipeline alignments to the South Metro gap area vary from approximately 1,500 to 2,100 feet, depending on the intake and ending locations. Conceptual layouts of an Arkansas pumpback are shown from Avondale, Boone and LaJunta north to the El Paso county gap area as shown in Figure 5-20. It may be possible to exchange water upstream and divert higher quality water at upstream locations. Elevation profiles for the pipeline alignments were developed and are shown in Figure 5-21. The elevation gain for the Arkansas pipeline alignments vary from approximately 2,000 to 3,500 feet, depending upon starting and ending location. The following are some of the key considerations when examining the project elements, benefits, potential implementation issues and potential attributes for this alternative. Project Elements-Lower South Platte/Arkansas Pumpback Option ~ Can accommodate a traditional or alternative agricultural transfer. ~ Pipeline and pumping from lower South Platte to South Metro area, and from the Arkansas to northern El Paso County and other areas. ~ Storage would be required at both ends of the pipeline in order to provide for firm annual yield and maximize the use of pipe and pumping infrastructure capacity by delivering water on a full pipe baseload basis. ~ Alluvial pretreatment (bank filtration) is assumed as a pretreatment step for organics removal and to precondition the water for advanced membrane processes such as reverse osmosis. ~ Advanced water treatment (reverse osmosis) would be required to remove total dissolved solids and other constituents and there would be associated high capital and O~eM costs for advanced water treatment and the disposal of the water treatment waste stream concentrate. 5-24 FINAL DRAFT