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HUdd�talw•Htrry <br />r- ir...�,a r..• ,, t r r <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. <br />X X2008 ALL PR03ECTS•00189 - 3E Storer Associates W00189 -0003 Rouse Mine\200 - Gee00189.0003 R032114Rl doc <br />