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Spring 2010 Subsidence and <br />Geologic Field Observations <br />Box Canyon, Apache Rocks and <br />South of Divide Mining Areas <br />PREPARED FOR: <br />Mountain Coal Company, LLC <br />West Elk Mine <br />P.O. Box 591 <br />Somerset, CO 81434 <br />PREPARED BY: <br />Gary D. Witt, P.G., Hydrogeologist/Geological Engineer <br />C. Richard Dunrud, P.E., Adjunct Senior Geological Engineer <br />Wright Water Engineers, Inc. <br />OCTOBER 2010 <br />831-032.792