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2016 Recommended Modifications to the West Elk Mine Hydrologic Monitoring Network i <br />2016 RECOMMENDED MODIFICATIONS TO THE WEST ELK MINE <br />HYDROLOGIC MONITORING NETWORK <br />TABLE OF CONTENTS <br />1.0 INTRODUCTION...............................................................................................................1 <br />2.0 SPRING AND SEEP MONITORING NETWORK SUMMARY......................................2 <br />2.1 Gribble Gulch and Raven Gulch Monitoring Network............................................5 <br />2.1.1 Gribble Gulch Area Springs.........................................................................5 <br />2.1.1.1 <br />Spring G-25 (Decreed Spring #22) ............................................5 <br />2.1.1.2 <br />Spring G-26a..............................................................................8 <br />2.1.1.3 <br />Spring G -28a (Decreed Spring #20) ........................................10 <br />2.1.1.4 <br />Spring G-30..............................................................................12 <br />2.1.1.5 <br />Spring G-31 (Decreed Spring#23)..........................................13 <br />2.1.1.6 <br />Spring G-35 (Decreed Spring # l 8) ..........................................16 <br />2.1.1.7 <br />Spring G-49..............................................................................18 <br />2.1.1.8 <br />Spring CR -12 (Decreed Spring#12)........................................20 <br />2.1.2 Raven Gulch Area Springs.........................................................................22 <br />2.1.2.1 <br />Spring 24-3...............................................................................22 <br />2.1.2.2 <br />Spring E-13-1...........................................................................24 <br />2.1.2.3 <br />Spring E-13-2...........................................................................26 <br />2.1.2.4 <br />Spring E-13-3...........................................................................28 <br />2.1.2.5 <br />Spring E-13-4...........................................................................30 <br />2.2 Box Canyon Area Monitoring Network................................................................32 <br />2.2.1 Box Canyon Area Springs.........................................................................32 <br />2.2.1.1 <br />Seep E-14-1..............................................................................32 <br />3.0 SURFACE WATER MONITORING NETWORK...........................................................33 <br />3.1 Gribble Gulch Surface Water Monitoring Sites.....................................................35 <br />3. 1.1 Lower Gribble Gulch.................................................................................35 <br />3.2 Raven Gulch Surface Water Monitoring Sites.......................................................38 <br />3.2.1 Lower Raven Gulch...................................................................................38 <br />3.2.2 Upper Raven Gulch....................................................................................41 <br />4.0 GROUNDWATER MONITORING NETWORK <br />.44 <br />4.1 Collapsed and Obstructed Wells............................................................................47 <br />5.0 RECOMMENDATIONS ..................... <br />6.0 REFERENCES .......................................... <br />.48 <br />.49 <br />August 2016 HydroGeo, Inc. <br />