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11 Huddleston-Besq
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<br />1.0 INTRODUCTION
<br />As part of their operations, Bowie Resources, LLC plans to increase the
<br />maximum height of gob pile #2. As part of the design development process, Huddleston -
<br />Berry Engineering and Testing, LLC (HBET) was retained by Bowie Resources to
<br />evaluate the proposed full buildout of gob pile #2.
<br />1.1 Referenced Documents
<br />As part of our assessment, HBET reviewed the following documents.
<br />• 2"`u Quarter Snnmmy of Inclinometer and vibrating Vire Piezometer Data June
<br />2014, Bowie Mine No. 2, Coal Waste Disposal Area No. 2 by Buckhorn Geotech,
<br />Inc., July 1, 2014.
<br />• Stability Evaluation, Technical Revision #85, Gob Pile 92 Drying Area, Bowie
<br />No. 2 Mine by Huddleston -Berry Engineering & Testing, LLC, June 3, 2014.
<br />• Revised Sunintauy of Inso-umnentation Monitoring, 4"' Quarter 2013 by Buckhorn
<br />Geotech, Inc., February 18, 2014.
<br />• Response to DRIFTS Comments dated Januauy 16, 2014 by Buckhorn Geotech,
<br />Inc., February 4, 2014.
<br />• Botivie Resources, LLC, Boivie no. 2 Mine, Technical Revision 985, Gob Pile #2
<br />Duyhng Area, Permit C-1996-083 by J.E. Stover & Associates, Inc., December
<br />18, 2013.
<br />0 Construction Materials Testing and Data, Bowie Mine No. 2 Gob Pile Stability,
<br />Borrie, Colorado, Inlet -int Report No. 35 — 4`n' Quarter 2013 by Buckhorn
<br />Geotech, Inc., December 18, 2013.
<br />• Stability Analyses of Proposed Slopes for Gob Dying Area by Buckhorn
<br />Geotech, inc., December 5, 2013.
<br />• Sunnnnauy of Instrumentation Monitoring, 3" Quarter 2013 by Buckhorn
<br />Geotech, Inc., September 25, 2013.
<br />• Stability Analysis of Proposed Slopes of 2.5K•IV, Sections A -A' and F -F' by
<br />Buckhorn Geotech, Inc., July 29, 2013.
<br />• Revised Stability Evaluations fol- Coal Mine Waste Disposal Area No. 2, Bowie
<br />No. 2 Mine, DRRIIS Permit C-1996-083, Delta County, Colorado by Buckhorn
<br />Geotech, Inc., September 22, 2008.
<br />• Geolechnical Report, Stability Evaluation of Coal Waste Disposal Area, Boivie
<br />No. 2 Mine, Delta County, Colorado by Buckhorn Geotech, Inc., February 15,
<br />2006.
<br />• Geotechnical Engineering Si udy, Boivie 42 Mine, Gob Pile, Paonia, Colorado by
<br />Lambert and Associates, November 10, 2003.
<br />1.2 Scope
<br />The scope of the current work includes the following components:
<br />■ Reviewing available data to define engineering parameters, piezometric
<br />surface elevation, etc.
<br />■ Setting tip a model which represents the proposed final buildout configuration
<br />of gob pile #2.
<br />■ Evaluating the stability of gob pile 42 at final buildout.
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