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Dewatering Evaluation Report <br />Varra Pit 122 <br />Weld County, Colorado <br />Page 6 <br />case scenario and a substantial amount of time will be required before maximum drawdowns will <br />occur. <br />In the author's opinion one cannot reasonably differentiate the head differences of seasonal <br />groundwater fluctuations and head differences possibly created by lining mined pits — they are <br />within expected seasonal head variations expected for geologic settings of this kind. The <br />permeability of the aquifer materials adjacent and in between the extraction areas are sufficient <br />to mitigate pressure gradients created by the impermeable liners. This type of analysis is also <br />complicated by the numerous aquifer stresses and aquifer gains which occur in close proximity to <br />the extraction developments — making any conclusion a best guess. <br />As there are domestic wells located within the area influenced by pumping, it may be advisable to <br />conduct a physical well survey prior to the mine start-up. Though there is sufficient aquifer <br />thickness to provide good well yields in most areas there may be partially penetrating wells that <br />might be affected by mine dewatering. <br />This report was prepared by AWES, LLC <br />Date: 07/27/2015 <br />Joby L. Adams, P.G. <br />Principal/Hydrogeologist