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• TABLE OF CONTENTS <br />SITE SPECIFIC GROUND WATER INFORMATION AND BASELINE DATA ........ 2.04.7-6 <br />Introduction .................................................... 2.04.7-6 <br />Baseline Ground Water Levels ..................................... 2.04.7-6 <br />Alluvial Water Levels ........................................ 2.04.7-7 <br />Overburden Water Levels ................................... 2.04.7-8 <br />Dakota Coal Water Levels ................................... 2.04.7-9 <br />Underburden Water Levels .................................. 2.04.7-9 <br />Spoil Water Levels ........................................ 2.04.7-10 <br />Multiple Completion Well Water Levels ........................ 2.04.7-10 <br />Potentiometric Surfaces .................................... 2.04.7-11 <br />Overburden ............................................. 2.04.7-11 <br />Dakota Coal ............................................. 2.04.7-12 <br />Underburden ............................................ 2.04.7-12 <br />Effects of the Irrigation System on Potentiometric Surfaces ....... 2.04.7-13 <br />Recharge ............................................... 2.04.7-13 <br />Hydrologic Boundaries .......................................... 2.04.7-13 <br />Infiltration and Permeability of the Unsaturated Zone ................... 2.04.7-14 <br />Discharge .................................................... 2.04.7-15 <br />Evapotranspiration ........................................ 2.04.7-15 <br />Aquifer Characteristics of the New Horizon Mining Areas ................ 2.04.7-16 <br />Ground Water Quality ........................................... 2.04.7-17 <br />Springs ...................................................... 2.04.7-22 <br />Ground Water Suitability ......................................... 2.04.7-23 <br />Present Ground Water Use .................................. 2.04.7-23 <br />Potential Ground Water Use ................................ 2.04.7-23 <br />REGIONAL SURFACE WATER CHARACTERISTICS ........................ 2.04.7-25 <br />Regional Surface Water Flow ..................................... 2.04.7-25 <br />Regional Surface Water Quality ................................... 2.04.7-26 <br />• <br />REVISED JULY 2006 <br />