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West Elk Mine 2006 Annual Hydrology Report 48 <br />• levels. Since mining commenced in the Box Canyon Panel area water levels in monitoring wells <br />01-11-1 and RAV 4b, both located down-gradient of active mining, have dropped up to 100 feet, <br />likely the result of dewatering of the B-Seam. <br />The well casings have collapsed in six ground water monitoring wells: SOM-45-H1 (Sept. 2002), <br />SOM-2-H (Jul. 1999), SOM-16-H (Sep. 2000), 96-27-1 (Apr. 2002), and SO.W-1 (Jun. 2002) is <br />most likely due to mine-induced subsidence. The collapsed casing in well SOM-23-H-1 (Aug. <br />2006) is most likely due to poor well construction. <br />A Thermal Event in the Mine occurred between in October 2005 and January 2006. A total of <br />404.35 ac-ft of water was pumped from the North Fork to help extinguish the fire until the water <br />pipeline froze in late December 2005. Normal mining of the E Seam re-started in late January <br />2006 and B Seam mining re-started in early March 2006. <br />The Upper Dry Fork monitoring site was periodically submerged for the past four years by beaver <br />activities. In October 2005 MCC relocated the Upper Dry Fork monitoring station and installed a <br />Parshall flume and a Global Water data logger so data for this site was available for WY 2006. <br />*~**** <br />• <br />• <br />December 2007 HydroGeo, Inc. <br />