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References <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 />Closin <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 us. <br />Sincerely, <br />BUCKHORN GEOTECH, INC. <br />Brett R. Byler, P.E. <br />Enclosures: Instrumentation Site Plan, Inclinometer Cumulative Displacements, Summary of Pore <br />Pressure Monitoring, Interpretation of Inclinometer Data, Calibration Certificates for <br />VWP-06 through VWP-08 <br />cc: Jim Stover, J.E. Stover and Associates <br />Bowie Gob Pile 2 Instrumentation Monitoring 2nd Qtr 2009.doc <br />Project #05-126-GEO <br />Page 3 of 3