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4A6k <br />West Elk Mine 2016 Surface Water and Groundwater Quantity and Quality Data Summary <br />MOUNTAIN COAL COMPANY, LLC <br />WEST ELK MINE <br />SUMMARY OF WATER YEAR 2016 SURFACE WATER AND GROUNDWATER <br />QUANTITY AND QUALITY DATA <br />TABLE OF CONTENTS <br />1.0 INTRODUCTION...............................................................................................................1 <br />2.0 HYDROLOGIC MONITORING PLAN.............................................................................1 <br />2.1 Surface Water Monitoring Program.........................................................................4 <br />2.2 Spring and Seep Monitoring Program.....................................................................7 <br />2.3 Groundwater Monitoring Program........................................................................10 <br />2.4 Underdrain and Mine Water Monitoring...............................................................13 <br />3.0 ASSESSMENT OF MINE -INDUCED HYDROLOGIC IMPACTS IN <br />WY 2016 AND ANTICIPATED IMPACTS IN WY 2017 ...............................................14 <br />3.1 Surface Water.........................................................................................................14 <br />3.1.1 Impacts to Area Stream Water Quality......................................................14 <br />3.1.2 Impacts to Area Stream Water Quantity....................................................17 <br />3.2 Springs and Seeps..................................................................................................17 <br />3.2.1 Impacts to Spring and Seep Water Quality................................................17 <br />3.2.2 Impacts to Spring and Seep Water Quantity..............................................20 <br />3.3 Groundwater..........................................................................................................20 <br />3.3.1 Impacts to Groundwater Quality................................................................21 <br />3.3.2 Impacts to Groundwater Quantity..............................................................22 <br />4.0 ADEQUACY OF THE MONITORING PROGRAM.......................................................22 <br />4.1 Mining Related Hydrologic Impacts......................................................................23 <br />5.0 REFERENCES..................................................................................................................24 <br />June 2017 HydroGeo, Inc <br />