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Doc Date:12/11/2001 III IIIIIIIIIIIIIIII <br />•r <br />EXHIBIT 51 <br />MOUNTAIN COAL COMPANY, L.L.C. <br />West Elk Mine <br />LOWER REFUSE PILE <br />Submitted as Permit Revision to CDMG Permit #C-80-007 <br />July 1981 <br />~~ <br />Geotechnical studies and designs by Charles C. Rehn, P.E., et. al., ojHarding Lmvson ,associates, formerly of Em~irocon, <br />/nc.. formerly ojGeoWest and formerly ojRocAy,Nountain Geotechnicd. <br />Revised August 1985 <br />May 1986 <br />Decemberl986 <br />February 1988 <br />August 1989 <br />March 1993 <br />1une1994 <br />March 1996 <br />December 1997 MR235 <br />December1998 MR255 <br /> <br />