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Final West Elk Mine 2005 Annual Hydrology Report 43 <br />• dewatering has also lowered the Barren Member and F-Seam ground water levels shown in wells <br />SOM 45-H2 and SOM C-76. <br />The well casings have collapsed in five ground water monitoring wells: SOM-45-H] (Sept. 2002), <br />SOM-2-H (July 1999), SOM-16-H (Sept. 2000), 96-27-1 (Apr. 2002), and So.W-1 (June 2002, <br />most likely due to mine-induced subsidence. <br />The Project's monitoring program is providing adequate hydrologic data to assess mining-related <br />impacts with the exception of the flow measurements collected at the Upper and Lower Deep <br />Creek and the Upper Dry Fork monitoring stations and the aforementioned dysfunctional wells. It <br />is strongly recommended that flumes or similar devices be installed at both of the Deep Creek <br />stations to provide a direct means of accurately measuring flow. The existing scenario that utilizes <br />a rating curve for the general channel geometry, which is dynamic, is inadequate and does not <br />provide reliable or representative data. Once flumes or other devices are installed, the continuous <br />flow measurement instruments (pressure transducers and data loggers) would need to be <br />recalibrated. <br />The Upper Dry Fork monitoring site was submerged for the past three years due to beaver <br />activities. In October 2005 MCC relocated the Upper Dry Fork monitoring station and installed a <br />• Parshall flume and a Globa] Water data logger so data for this site can be collected and analyzed in <br />WY 2006. <br />~:~.+. <br />• <br />September 2006 Hy(l/oG¢O, //1C. <br />