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<br />1.0 INTRODUCTION
<br />As part of their operations, Bowie Resources, LLC plans to dry coal mine waste
<br />(gob) on top of gob pile #2 prior to final placement in the gob pile. As part of the design
<br />development process, Huddleston -Berry Engineering and Testing, LLC (HBET) was
<br />retained by Bowie Resources to evaluate the proposed gob drying area.
<br />1.1 Referenced Documents
<br />As part of our assessment, HBET reviewed the following documents.
<br />• Revised Summary of Instrumentation Monitoring, 4'h Quarter 2013 by Buckhorn
<br />Geotech, Inc., February 18, 2014.
<br />• Response to DRrbIS Comments dated January 16, 2014 by Buckhorn Geotech,
<br />Inc., February 4, 2014.
<br />• Bowie Resources, LLC, Bowie no. 2 Mine, Technical Revision #85, Gob Pile #2
<br />Drying Area, Permit C- 1996 -083 by J.E. Stover & Associates, Inc., December
<br />18, 2013.
<br />• Construction Materials Testing and Data, Botivie Mine No. 2 Gob Pile Stability,
<br />Bowie, Colorado, Interim Report No. 35 — 4'6 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 />• Smmnnary of Instrumentation Monitoring, 3'd Quarter 2013 by Buckhorn
<br />Geotech, inc., September 25, 2013.
<br />• Stability Analysis of Proposed Slopes of 2.5H.-]V, Sections A -A' and F -F' by
<br />Buckhorn Geotech, Inc., July 29, 2013.
<br />• Revised Stability Evaheations for Coal Mine Waste Disposal Area No. 2, Botivie
<br />No. 2 Mine, DRMS Permit C- 1996 -083, Delta Comity, Colorado by Buckhorn
<br />Geotech, Inc., September 22, 2008.
<br />• Geotechnical Report, Stability Evaluation of Coal Waste Disposal Area, Bowie
<br />No. 2 Mine, Delta Comity, Colorado by Buckhorn Geotech, Inc., February 15,
<br />2006.
<br />• Geotechnical Engineering Study, Bowie #2 Mine, Gob Pile, Paonia, Colorado by
<br />Lambert and Associates, November 10, 2003.
<br />1.2 Scope
<br />As discussed above, Bowie Resources, LLC proposes to dry gob on top of the
<br />existing gob pile #2. The purpose of our evaluation was to determine the impacts on the
<br />existing gob pile #2 associated with drying gob on top of the existing pile. The scope of
<br />the work included the following components:
<br />• Reviewing available data to define engineering parameters, piezometric
<br />surface elevation, etc.
<br />• Setting up a model which represents the existing gob pile #2 and proposed gob
<br />drying area.
<br />• Evaluating the stability of the gob drying area and gob pile #2.
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