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HAHN WATER RESOURCES, LLC <br /> Seasonal variations in the performance of the dewatering system are expected to be relatively <br /> minor. Groundwater levels in the alluvial aquifer, the target of the dewatering, are expected to <br /> track water levels in the Colorado River. River stage is estimated to vary over the course of a <br /> year by about 3 feet, with the exception of the month of June. Snowmelt runoff typically peaks in <br /> June, when river stage may peak at 5 feet or more above average. Changes in groundwater levels <br /> may require slightly more pumping to achieve the equivalent water level drawdown, or they may <br /> limit the depth to which mining can advance while the groundwater levels are elevated. Peaks in <br /> river stage typically last less than one month. <br /> Respectfully submitted, <br /> William F. Hahn, P.G. <br /> 4 <br /> 6589 Elaine Road -Evergreen,Colorado 80439• office 720.242.8639 •cell: 303.870.5757 <br /> hahnwaterresources@gmail.com • www.hahnwaterresources.com <br />