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Dewatering Evaluation Report <br />Varra Gravel Operation <br />Kurtz Pit <br />Platteville, Colorado <br />Page 4 <br />Conclusions <br />The results of analytical and numerical solutions predict that the water table in the vicinity <br />of Tract B at the Varra Kurtz Pit operation will be lowered by eight to ten feet below <br />wetlands identified north of the pit — assuming that the entire 13.75 acre pit is dewatered. <br />Solutions also indicate that dewatering north of the pit can be abated by providing a water <br />source between the pit and identified wetlands. This can be accomplished by constructing <br />an unlined conveyance ditch between the pit and wetlands. Providing a water source <br />along the majority of the north pit face may increase pumping rates in excess of 50 %. <br />Infiltration from the settling pond will adequately protect the wetlands if only one -half of the <br />pit (or less) is dewatered at any given time. <br />This report was prepared by CGRS, INC. <br />Joby L. Adams, P.G. <br />Principal /Hydrogeologist <br />Remarks <br />The discussion and recommendations in this report represent our professional opinions. <br />Our conclusions, opinions and recommendations are based on information available at <br />this time, and we do not guarantee that undiscovered conditions will not become evident in <br />the future. CGRS' report was prepared in accordance with currently accepted engineering <br />practices at this time and location, and no other warranties, representations or <br />certifications are implied or intended. <br />Date (' )--ol'.l.,e-r 7 Zoo 7- <br />