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Huddigstan -Berry <br />1-5 -x in,y RY =,. 1 I <br />1.0 INTRODUCTION <br />As part of their operations, Bowie Resources, LLC plans to place coal mine waste <br />(gob) at a new location identified as gob pile #3. Evaluation of proposed gob pile #3 was <br />completed by Buckhorn Geotech, Inc. (Buckhorn) in 2007. However, Huddleston -Berry <br />Engineering and Testing, LLC (HBET) was retained by Bowie Resources to re- evaluate <br />the proposed gob pile #3. <br />1.1 Referenced Documents <br />As part of our assessment, HBET reviewed the following documents. <br />• Field Observation Report by Buckhom Geotech, Inc., May 17, 2013. <br />• Stability Evaluation of Proposed Coal Wastepile No. 3, Bowie No. 2 Aline, Delta <br />County, Colorado by Buckhorn Geotech, Inc. for Bowie Resources, LLC, March <br />29, 2007. <br />1.2 Scope <br />As discussed above, Bowie Resources, LLC proposes to place coal mine waste at <br />a new location designated as gob pile #3. The purpose of our evaluation was to re- <br />evaluate the stability of proposed gob pile #3. The scope of our work included: <br />• Reviewing available data to define engineering parameters, piezometric <br />surface elevation, etc. <br />• Completing laboratory testing to evaluate materials being placed at gob pile <br />#3. <br />• Setting up a model which represents the proposed gob pile #3. <br />• Evaluating the stability of proposed gob pile #3. <br />The evaluation was completed by a Colorado registered professional engineer in <br />accordance with generally accepted geotechnical engineering practices. This report has <br />been prepared for the exclusive use of Bowie Resources, LLC. <br />2.0 BACKGROUND <br />The referenced report indicates that a geotechnical investigation at the location of <br />the proposed gob pile #3 was completed by Buckhorn in 2006. Foundation soil <br />conditions and groundwater conditions were evaluated as part of the investigation. <br />However, at the time of the original investigation, materials to be placed at gob pile #3 <br />were unavailable. As a result, Buckhorn used laboratory testing results for waste on gob <br />pile #2 in the evaluation of gob pile #3. The results of the analyses indicated that the <br />proposed gob pile #3 was stable at a proposed slope of 2.511:1 V. <br />X %2008 ALL PROJECTS'00189 - JE Stover Assoclates IrWD0499.0003 Bmie SBeet200 - Geo.Cmb 3ti nisioa M489 -OW3 R052114 R2 doe <br />