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I I I I ! I I I I I I I I I I I I I I I JCHA Ruete....Hess Reservoir Proiect Descriotion January 2000 Rueter-Hess Reservoir Site Advantages Advantages of the Rueter-Hess Reservoir dam site: ,f Proximity to District water supply facilities for reservoir storage and for direct distribution. ,f Proximity to District treatment plant for use of A WT effluent. ,f Proximity to District Denver Basin well fields for a conjunctive use plan. ,f Fewer permitting issues due to the off-stream nature of the reservoir. ,f Recognized by the Front Range Water Forum. In addition to being able to store in-priority Cherry Creek flows, the District has also adjudicated an augmentation plan (Case No. 83CW348), which allows the District to (a) operate its other Cherry Creek water rights under their own priority, (b) re-use its Denver Basin aquifer water, and (c) operate an exchange essentially through the stream reach that is within the District's boundaries. The augmentation plan allows the District a greater degree of flexibility for water that is available for storage in Rueter-Hess Reservoir. Preliminary work has also been conducted at the dam and reservoir site relative to the geotechnical feasibility of the dam and a preliminary environmental assessment of the dam and reservoir area. Knight-Piesold (KP) conducted a preliminary geotechnical investigation for the proposed Rueter-Hess dam axis in 1994 that included the drilling of four boreholes along the proposed dam alignment to evaluate subsurface conditions. In 1996, KP conducted a follow-up subsurface exploration that included the drilling of an additional four exploratory boreholes along the abutment areas of the proposed dam alignment and the digging of 23 test pits in the reservoir basin and embankment footprint areas to gain additional knowledge about the near- surface soils and bedrock, in addition to obtaining a cursory material assessment. 5611i-Dec-rpt -7-