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Y <br /> and gravels typically range between 1,000 to 1 x 106 ft/yr (Freeze and Cherry, 1979). As in the <br /> other drainages at Climax, the bedrock topography controls the direction of ground water flow. <br /> Ground water flow in the valley is also influenced by the presence of three surface water • <br /> bodies: Chalk Mountain Reservoir, Robinson Lake, and Eagle Park Reservoir. Each of these <br /> reservoirs was constructed by excavating and building an engineered dam to impound water. <br /> Construction records for each dam indicate that a low permeability cut-off wall was excavated <br /> into the underlying bedrock to control ground water. Cut-off walls under each dam present a <br /> physical barrier to ground water flow. Therefore, significant and continuous ground water flow in <br /> the alluvium and bedrock throughout the valley is unlikely as ground water flow is intercepted by <br /> the reservoirs. <br /> Eagle Park Reservoir is located above the East Fork of the Eagle River (Figure 1). Ground <br /> water exiting the drainage and the Climax property is intercepted by the Eagle Park Dam (No. 4 <br /> Dam). Site observations indicate that very little ground water exits below No. 4 Dam. Ground <br /> water which does seep below No. 4 Dam is collected in a collection sump keyed into bedrock <br /> and pumped back to Eagle Park Reservoir or Robinson Lake. The average, intermittent <br /> pumping rate for the sump is approximately 10 gpm which reflects the low rate of ground water <br /> seepage. In practical terms, ground water does not discharge from Climax Property into Eagle <br /> River. <br /> • <br /> • <br />