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West Elk Mine 2001 Mnual Hydrology Report <br />7.0 SUMMARY <br />• During WY2001, the Project was in regulatory compliance with all hydrologic aspects. Mining <br />operaflons did not cause any significant impacts to local surface or ground water resources. The <br />continued drought conditions in the area have resulted in reduced flows in most surface streams <br />and springs. Wells levels have remained constant, however wells that are above active longwall <br />mining sometimes show lower water levels, but these water levels typically recover after mining in <br />the area has stopped. Casings of some wells (SOM-2H and SOM-16H) have collapsed due the mine- <br />induced subsidence, but these effects have been limited. <br />The Project's current monitoring program is adequate with the exception of flow measurements at <br />the Upper and Lower Deep Creek stations and wells SOM-2H and SOM-16H. The Deep Creek <br />stations need to have a direct means of measuring flow other than a rating curve for the general <br />channel geometry. Direct flow could be measured using a permanent or portable flume or similaz <br />devices. The continuous flow measurement instruments (pressure transducers and data loggers) <br />would need to be recalibrated to the specific flow measurement device. It has been recommended <br />that MCC complete the Deep Creek work in 2002. <br />In addition, wells SOM-2H and SOM-16H are inoperable and should be taken out of the <br />• monitoring program.? <br />Watec, Inc. collected data presented in this report and historical data was provided by MCC. <br />HydroGeo compiled the data, completed the interpretations and prepazed the report. <br />*^-•^+ <br /> <br />27 <br />rrojutnoo3ol HydroGeo, Inc. <br />