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<br />Page 3 of 3 <br />Finally, the USGS report states it would be difficult to isolate the contribution of any one pit to the behavior of <br />groundwater levels (Ref. p. 2; USGS 2010). As such, it is impractical to determine how much, if any, the Everist Fort <br />Lupton Mine Pit reclamation slurry walls contribute to local flooding. <br />References <br />U.S. Geological Survey, 2010. Land-Use Analysis and Simulated Effects of Land-Use Change and Aggregate Mining <br />on Groundwater Flow in the South Platte River Valley, Brighton to Fort Lupton, Colorado, Scientific Investigations <br />Report 2010-5019. U.S. Geological Survey, Reston, VA 2010. <br />Exhibit 1. Sand Bars near Bachofer Property