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Prairie Waters Project Overview The Prairie Waters Project consists of several key infrastructure components that will allow Aurora Water to fully utilize its existing water rights from the South Platte River. These elements include a network of groundwater wells adjacent to the South Platte River, collection piping, natural purification systems including riverbank filtration and aquifer recharge and recovery, water storage for augmentation, pumping stations, a transmission pipeline, and a water purification facility. Based on the preliminary screening process, the following PWP facilities were recommended in the Conceptual Report (MWH, September, 2004): • Diversion facilities to divert water from the lower South Platte River near Brighton, consisting of alluvial wells and natural purification basins (North Campus). • The Conveyance System consisting of transmission facilities including three pumping stations and a 60-inch diameter pipeline to convey water from the North Campus near Brighton to new water purification facilities located near Aurora Reservoir (South Campus). • A new water purification facility located at Aurora Reservoir (South Campus), to provide additional treatrnent of the water from the North Campus natural purification systems, and to deliver a blend of the new supply and the City's existing water supply to the water distribution system. These PWP elements are shown in Figure 2 below. Water Quality Because of the source water quality developed at the North Campus facilities, Aurara Water has carefully assessed the capabilities of two existing direct filtration plants to adequately treat water before it is delivered to the distribution system. Early in the project, the consulting team recommended the need for a more robust and sequential water treatment train that could produce a finished water that replicates the high quality water that Aurora Water customers currently receive (excerpted from Binney, 2006). Aurora Water staff worked closely with CH2M HILL treatment specialists to complete the conceptual design of the purification process for the South Carnpus, which includes a softening stage, a combined ultraviolet-advanced oxidation stage, and a granular activated carbon stage before disinfection. The remaining constituent, total dissolved solids (TDS), will be managed by dilution with existing mountain water sources stored in an adjacent reservoir. The goal of the blending strategy is to maintain a finished water TDS concentration under 400 milligrams per liter (mg/L) (excerpted from Binney, 2006).