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Oil & Natural Gas Technology DOE Award No.: DE-AD26-06NT02045 Final Report Anticipated and Observed Impacts to Groundwater Associated with the Construction Use of Infiltration Impoundments in the Powder River Basin Submitted by: Arthur Langhus Layne-LLC dba ALL Consulting 1718 South Cheyenne Avenue Tulsa, Oklahoma 74119 Prepared for: United States Department of Energy National Energy Technology Laboratory Office of Fossil Energy