Sincerely,
<br />BUCKHORN GEOTECH, INC.
<br />Daniel C. Quigley, P.
<br />cc: Jim Stover, J.E. Stover and Associates — ELECTRONICALLY ONLY
<br />References
<br />Enclosures: Instrumentation Site Plan, Inclinometer Cumulative Displacements, Summary of Pore
<br />Pressure Monitoring
<br />Buckhorn Geotech, Inc. (BGI), 2006. "Geotechnical Report, Stability Evaluation of Coal Waste
<br />Disposal Area, Bowie No. 2 Mine, Delta County, Colorado ", February 15, 2006.
<br />Buckhorn Geotech, Inc. (BGI), 2008. "Revised Stability Evaluations for Coal Mine Waste
<br />Disposal Area No. 2, Bowie No. 2 Mine, DRMS Permit C- 1996 -083 Delta County,
<br />Colorado ", September 22, 2008.
<br />Buckhorn Geotech, Inc. (BGI), 2009. "Summary of Instrumentation Monitoring, 2 Quarter
<br />2009, Bowie Coal Waste Disposal Area No. 2 ", letter to Bowie Resources, LLC dated
<br />June 17, 2009.
<br />Buckhorn Geotech, Inc. (BGI), 2010. "Summary of Instrumentation Monitoring, 1st Quarter
<br />2010, Bowie Coal Waste Disposal Area No. 2 ", letter to Bowie Resources, LLC dated April
<br />5, 2010.
<br />Buckhorn Geotech, Inc. (BGI), 2010. "Summary of Instrumentation Monitoring, 2nd Quarter
<br />2010, Bowie Coal Waste Disposal Area No. 2 ", letter to Bowie Resources, LLC dated
<br />June 30, 2010.
<br />Buckhorn Geotech, Inc. (BGI), 2010. "Summary of Instrumentation Monitoring, 3r Quarter
<br />2010, Bowie Coal Waste Disposal Area No. 2 ", letter to Bowie Resources, LLC dated
<br />September 22, 2010.
<br />Buckhorn Geotech, Inc. (BGI), 2011. "Summary of Instrumentation Monitoring, 4th Quarter
<br />2010, Bowie Coal Waste Disposal Area No. 2 ", letter to Bowie Resources, LLC dated
<br />December 30, 2010.
<br />Buckhorn Geotech, Inc. (BGI), 2011. "Summary of Instrumentation Monitoring, 1st Quarter
<br />2011, Bowie Coal Waste Disposal Area No. 2 ", letter to Bowie Resources, LLC dated
<br />March 30, 2011.
<br />Buckhorn Geotech, Inc. (BGI), 2011. "Summary of Instrumentation Monitoring, 2nd Quarter
<br />2011, Bowie Coal Waste Disposal Area No. 2 ", letter to Bowie Resources, LLC dated
<br />July 1, 2011.
<br />Bowie Gob Pile 2 Instrumentation Monitoring 1st Qtr 2012.doc
<br />Project #05- 126 -GEO
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