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TABLE OF CONTENTS SECTION 2.04.7 HYDROLOGY DESCRIPTION SITE SPECIFIC GROUND WATER INFORMATION AND BASELINE DATA ...... 2.04.7-1 Introduction .................................. .................. 2 .04 .7-1 Baseline Ground Water Levels ................... .................. 2 .04. 7-1 Alluvial Water Levels . .................... .................. 2 .04 .7-2 Overburden Water Levels ................. .................. 2 .04. 7-3 Dakota Coal Water Levels ................................... 2.04.7-3 Underburden Water Levels .................................. 2.04.7-4 Spoil Water Levels ........................................ 2.04.7-5 Multiple Completion Well Water Levels ......................... 2.04.7-5 Potentiometric Surfaces .................................... 2.04.7-6 Overburden .............................................. 2.04.7-6 • Dakota Coal .............................................. 2.04.7-6 Underburden ............................................. 2.04.7-7 Effects of the Irrigation System on Potentiometric Surfaces ........ 2.04.7-7 Recharge ................................................ 2.04.7-8 Hydrologic Boundaries ........................................... 2.04.7-8 Infiltration and Permeability of the Unsaturated Zone .................... 2.04.7-8 Discharge ..................................................... 2.04.7-9 Evapotranspiration ....................................... 2.04.7-10 Aquifer Characteristics of the New Horizon Mining Areas ............... 2.04.7-11 Ground Water Quality ........................................... 2.04.7-12 Springs ...................................................... 2.04.7-17 Ground Water Suitability ......................................... 2.04.7-17 Present Ground Water Use . .......................... 2.04.7-17 Potential Ground Water Use ................................ 2.04.7-18 REGIONAL SURFACE WATER CHARACTERISTICS ................. 2.04.7-19