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Draft 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-H-2 and SOM C-76. <br />The well casings have collapsed in five ground water monitoring wells: SOM-45-H 1 (Sept. 2002), <br />SOM-2-H (Jul. 1999), SOM-16-H (Sep. 2000), 96-27-1 (Apr. 2002), and SO.W-1 (Jun. 2002, mast <br />likely due to mine-induced subsidence. <br />The Project's monitoring program is providing adequate monitoring 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 by beaver activities. <br />• Tn October 2005 MCC relocated the Upper Dry Fork monitoring station, installed a Parshall flume <br />and a Global Water data logger so data for this site can be collected and analyzed in WY 2006. <br />:~ ~ * x * ,~ <br />`J <br />September 2006 HydroGeO, Inc. <br />