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Fall 2008 Subsidence and Geologic Field Observations <br />Box Canyon, Apache Rocks, and South of Divide Mining Areas <br />0 7.0 BIBLIOGRAPHY <br />DeGraff, J. V. and C. H. Romesburg. 1981. Subsidence Crack Closure; Rate, Magnitude, and <br />Sequence. International Association of Engineering Geology Bulletin 23. <br />Dunrud, C. R. 1976. Some Engineering Geologic Factors Controlling Coal Mine Subsidence in <br />Utah and Colorado. Professional Paper 969. Denver, CO: U.S. Geological Survey. <br />1989. Geologic Map and Coal Stratigraphic Framework of the Paonia Area, Delta and <br />Gunnison Counties, Colorado. Coal Investigations Map C-115. Denver, CO: U.S. <br />Geological Survey. <br />1999. Subsidence Field Observations - September 15-17, 1999. Memorandum to <br />Christine Johnston, Mountain Coal Company, LLC. Denver, CO: Wright Water <br />Engineers, Inc. <br />2000. Subsidence Field Observations - August 28-30, 2000. Memorandum to Henry <br />Barbe, Mountain Coal Company, LLC. Denver, CO: Wright Water Engineers, Inc. <br />2001. Subsidence Field Observations, West Elk Mine, August 28 and 29, 2001. Denver, <br />CO: Wright Water Engineers, Inc. <br />2002. Subsidence Field Observations, West Elk Mine, August 27-29, 2002. Glenwood <br />Springs, CO: Wright Water Engineers, Inc. <br />. 2003. Subsidence Field Observations, West Elk Mine, July 22-24, 2003. Glenwood <br />Springs, CO: Wright Water Engineers, Inc. <br />2004a. Subsidence and Geologic Field Observations: Apache Rocks and Box Canyon <br />Mining Areas, July 12-15, 2004. Glenwood Springs, CO: Wright Water Engineers, Inc. <br />. 2004b. Exhibit 60C: Subsidence Evaluation and 2004 Geologic Hazard Field <br />Observations for the West Flatiron Lease Area. Glenwood Springs, CO: Wright Water <br />Engineers, Inc. <br />• <br />831-032.790 Wright Water Engineers, Inc. Page 67 <br />December 2008