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Dunrud, C. Richard (1989). Geologic Map and Coal Stratigraphic Framework of the Paonia <br />Area, Delta and Gunnison Counties, Colorado, United States Geological Survey, Map C- <br />115,1989. <br />Lambert and Associates (2003). Geotechnical Engineering Study, Bowie #2 Mine, Gob Pile, <br />Paonia, Colorado, November 10, 2003. <br />Rocscience (2004). Slide 2D limit equilibrium slope stability for soil and rock slopes, version <br />5.014, Rocscience, Inc., 2004. <br />9.0 CLOSING <br />This report has been prepared in a manner consistent with local standards of professional <br />geotechnical engineering practice. The classification of materials and interpretation of <br />subsurface stratigraphy and pore pressures are based on our training and years of experience, but <br />is necessarily based on limited subsurface observation and testing. As such, inferred ground <br />conditions cannot be guaranteed to be exact. No other warranty, express or implied, is made. <br />We recommend on -going monitoring of piezometers and inclinometers to verify our <br />recommendations and to potentially recommend steeper slopes of the coal waste stockpile. Also, <br />to provide continuity and consistency during gob placement, we should be retained to continue <br />with field inspection and in -situ density testing as a service to the owner. <br />We sincerely appreciate the opportunity to work with you on this project. If you have any <br />questions or concerns regarding this report, please do not hesitate to contact us. Continued <br />monitoring of pore pressures will provide an indication of the need for any such measures to <br />enhance pore pressure dissipation. <br />Respectfully Subm' <br />February, 15, 200 <br />T, <br />I ' 9291 ;D : o <br />Brett R. Byler, <br />%9, 0 'C' <br />E+''C' <br />NAI <br />J <br />J Bowie No 2 Gob Pile Stability Dec2005 <br />Project #05- 126 -GEO <br />1 Page 18 of 18 <br />J <br />Reviewed by: <br />February 15, 2006 <br />Thomas E. Griepentrog, P.E. <br />