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Prairie Waters Project Overview <br /> The Prairie Waters Project consists of several key infrastructure components that will allow <br /> Aurora Water to fully utilize its existing water rights from the South Platte River.These <br /> elements include a network of groundwater wells adjacent to the South Platte River, <br /> collection piping,natural purification systems including riverbank filtration and aquifer <br /> recharge and recovery,water storage for augmentation,pumping stations,a transmission <br /> pipeline,and a water purification facility.Based on the preliminary screening process,the <br /> following PWP facilities were recommended in the Conceptual Report(MWH,September, <br /> 2004): <br /> • Diversion facilities to divert water from the lower South Platte River near Brighton, <br /> consisting of alluvial wells and natural purification facilities (North Campus). <br /> • The Conveyance System consisting of transmission facilities including three <br /> pumping stations and a 60-inch diameter pipeline to convey water from the North <br /> Campus near Brighton to new water purification facilities located near Aurora <br /> Reservoir(South Campus). <br /> • A new water purification facility located at Aurora Reservoir(South Campus),to <br /> provide additional treatment of the water from the North Campus natural <br /> purification systems,and to deliver a blend of the new supply and the City's existing <br /> water supply to the water distribution system. <br /> These PWP elements are shown in Figure 2 below. <br /> Water Quality <br /> Because of the source water quality developed at the North Campus facilities,Aurora Water <br /> has carefully assessed the capabilities of two existing direct filtration plants to adequately <br /> treat water before it is delivered to the distribution system.Early in the project,the <br /> consulting team recommended the need for a more robust and sequential water treatment <br /> train that could produce a finished water that replicates the high quality water that Aurora <br /> Water customers currently receive(excerpted from Binney,2006). <br /> Aurora Water staff worked closely with CH2M HILL treatment specialists to complete the <br /> conceptual design of the purification process for the South Campus,which includes a <br /> softening stage,a combined ultraviolet-advanced oxidation stage,and a granular activated <br /> carbon stage before disinfection.The remaining constituent,total dissolved solids(TDS), <br /> will be managed by dilution with existing mountain water sources stored in an adjacent <br /> reservoir.The goal of the blending strategy is to maintain a finished water TDS <br /> concentration under 400 milligrams per liter (mg/L) (excerpted from Binney,2006). <br /> 5 <br />