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Ciosiner <br />On -going monitoring of inclinometers and piezometers at CWDA No. 2 provides an indication of <br />the stability of the refuse as well as an indication of probable performance for other refuse piles <br />at Bowie. For these reasons, we recommend continued monitoring of this instrumentation on a <br />quarterly basis. We sincerely appreciate the opportunity to work with you on this project. If <br />you have any questions regarding this letter or the instrumentation monitoring at CWDA No. 2, <br />please don't hesitate to contact me at (970) 497 -8852 or danCa>buckhorngeo,corn. <br />Sincerely, <br />BUCKHORN GEOTECH, INC. <br />Daniel C. Quigley, P.E. <br />cc: Jim Stover, J.E. Stover and Associates — ELECTRONICALLY ONLY <br />References <br />Bowie Gob Pile 2 Instrumentation Monitoring 3rd Qtr 2011.doc <br />Project #05- 126 -GEO <br />Page 3 of 4 <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, 2n Quarter <br />2010, Bowie Coal Waste Disposal Area No. 2 ", letter to Bowie Resources, LLC dated <br />June 30, 2010. <br />