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Table of Contents <br />Site Specific Ground Water Information and Baseline Data........................................................................ 3 <br />Introduction...................................................................................................................................... <br />3 <br />Baseline Ground Water Levels........................................................................................................ <br />3 <br />AlluvialWater Levels.........................................................................................................4 <br />Overburden Water Levels...................................................................................................4 <br />Dakota Coal Water Levels.................................................................................................. <br />5 <br />UnderburdenWater Levels................................................................................................. <br />5 <br />SpoilWater Levels.............................................................................................................. <br />6 <br />Multiple Completion Well Water Levels............................................................................ <br />6 <br />Potentiometric Surfaces................................................................................................................... <br />6 <br />Overburden......................................................................................................................... <br />6 <br />DakotaCoal........................................................................................................................7 <br />Underburden....................................................................................................................... <br />7 <br />Effects of the Irrigation System on Potentiometric Surfaces .............................................. <br />7 <br />HydrologicBoundaries.................................................................................................................... <br />8 <br />Infiltration and Permeability of the Unsaturated Zone.................................................................... <br />8 <br />Discharge......................................................................................................................................... <br />8 <br />Evapotranspiration........................................................................................................................... <br />9 <br />Aquifer Characteristics of the New Horizon Mining Areas............................................................. <br />9 <br />GroundWater Quality ....................................................................................................................10 <br />Springs..........................................................................................................................................14 <br />GroundWater Suitability ...............................................................................................................14 <br />Present Ground Water Use................................................................................................14 <br />Potential Ground Water Use.............................................................................................14 <br />Regional Surface Water Characteristics.....................................................................................................15 <br />Regional Surface Water Flow........................................................................................................15 <br />Regional Surface Water Quality....................................................................................................16 <br />Site Specific Surface Water Information.................................................................................................... <br />17 <br />Drainage Basin Geomorphology....................................................................................................17 <br />Channel Characteristics.................................................................................................................18 <br />PredictedPeak Flows.....................................................................................................................18 <br />Streams- Flow...............................................................................................................................19 <br />Streams- Water Quality................................................................................................................. <br />20 <br />West Lateral Irrigation Ditch - Flow and Water Quality............................................................... <br />22 <br />Relationships Among Flow, TSS and TDS................................................................................................ <br />25 <br />SurfaceWater Suitability............................................................................................................................26 <br />Hydrological Monitoring Program.............................................................................................................. <br />28 <br />Probable Hydrological Consequences........................................................................................................ <br />30 <br />Interruption of Groundwater Flow and Drawdown....................................................................... <br />31 <br />Impact on Groundwater Rights...................................................................................................... <br />31 <br />Potential Impacts of Replaced Spoil on Groundwater Quality ...................................................... <br />32 <br />Effects of Mining on the Local Geomorphology........................................................................... <br />33 <br />Effects of Sediment Ponds on Channel Characteristics and Downstream Users ........................... <br />33 <br />Effects of Sediment Pond Discharge on Surface Water Quality .................................................... <br />33 <br />Effects of Runoff from Reclaimed Areas on the Quality of Streamflow....................................... <br />33 <br />Page 2.04.7-1 March 2017 (TR -77) <br />