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TAB 7 <br /> HYDROLOGIC DESCRIPTION <br /> Table of Contents <br /> Pace <br /> 2.04.5 . Regional Hydrogeology 7-1 <br /> • Introduction 7-1 <br /> Topography 7-1 <br /> Lithology 7-1 <br /> Structural Controls 7-3 <br /> Regional Ground Water Recharge, Movement and Discharge 7-3 <br /> Regional Ground Water Quality 7-3 <br /> Significance of Ground Water 7-4 <br /> 2.04.7(1) Site Specific Ground Water Information 7-6 <br /> Introduction 7-6 <br /> 2.O4.7(1)(a)(ii) Baseline Ground Water Levels 7-6 <br /> Alluvial Water Levels 7-7 <br /> Overburden Water Levels 7-7 <br /> Dakota Coal Water Levels 7-8 <br /> Underburden Water Levels 7-8 <br /> Spoil Water Levels 7-9 <br /> Multiple Completion Well Water Levels 7-9 <br /> 2.04.7(1)(a)(i) Potentiometric Surfaces 7-10 <br /> Overburden 7-10 <br /> Dakota Coal 7-10 <br /> Underburden 7-11 <br /> Effects of the Irrigation System on Potentiometric Surfaces 7-11 <br /> 2.04.7(1)(b) Recharge 7-12 <br /> Hydrologic Boundaries 7-12 <br /> Infiltration and Permeability of the Unsaturated Zone 7-12 <br /> 2.04.7(1)(b) Discharge 7-14 <br /> Evapotranspiration 7-17 <br /> 2.04.7(1)(b) Aquifer Characteristics of the Nucla and Nucla East Mining Areas 7-21 <br /> Ground Water Quality 7-28 <br /> 2.04.7(1)(a)(iv) Site Specific Ground Water Quality 7-30 <br /> Nucla Mining Area 7-30 <br /> i Revised 04/11/88 <br />