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J. E. STOVER & ASSOCIATES, INC. <br />2352 NORTH 7TH STREET, UNIT B <br />GRAND JUNCTION, COLORADO 81501 <br />PHONE: (970) 245-4101, FAX: (970) 242-7908 <br />MINE ENGINEERING <br />MINE RECLAMATION <br />December 8, 2015 <br />Jason Musick <br />Division of Reclamation, Mining & Safety <br />1313 Sherman St., Room 215 <br />Denver, CO 80203 <br />Re: Bowie Resources, LLC, Bowie No. 2 Mine <br />Technical Revision 105, Expand Gob pile #3 to the East <br />Adequacy Response #1 <br />Dear Mr. Musick: <br />CIVIL ENGINEERING <br />CONST. MANAGEMENT <br />ptvtsl 7 t r 00amation, <br />Mining & 5atety <br />DRMS' letter dated November 23, 2015 transmitted its adequacy review for the referenced technical <br />revision. On behalf of Bowie Resources LLC, following are its responses to the DRMS' comment and <br />concerns. <br />1. DRMS: The TR -105 application discusses changes to the operational configuration of Gob Pile #3 and <br />associated revised text pages 1, 2, 3, 4, 4b, 5, 6 & 10 of Volume XI. New Page 4b is referenced as the <br />page showing the separation of the full build out configuration and the operational configuration and <br />the proposed new underdrain. No revised or new text pages were included with the TR -105 submittal. <br />Please submit all associated and revised new text to support the proposed Gob Pile #3 expansion. <br />BRL: Please see attached revised pages 1, 2, 3, 4, 4b, 5, 6, 10 & 11 of Volume XI. <br />2. DRMS: Based on the provided proposed new and revised Volume XI appendices associated with TR - <br />105, there is no indication or discussion that the additional piezometers are to be installed in the Gob <br />Pile #3 expansion. Information associated with the TR -105 application discusses details for an additional <br />underdrain to be constructed in the expansion are which leaves the impression that the potential for <br />groundwater exists. Water within the foundation and/or gob itself would increase pore water pressure <br />which may impact stability of the gob pile. Additionally, as stated in Huddleston -Berry Engineering & <br />Testing, LLC's (HBET) "Stability Evaluation - Gob Pile #3" (Report), based upon data from gob pile #2, <br />pore pressure will likely increase during the construction of the gob pile. Based upon this, it is the <br />Division's opinion that additional piezometers in the expansion section are needed. Please provide <br />details for additional piezometers within Gob Pile #3 expansion section or a justification as to why <br />additional piezometers are not required. In addition, please update Volume XI -Coal Mine Waste <br />Disposal Area No. 3 Figure 1 to include the addition of piezometers if needed. <br />BRL: Please see Figure 1, two additional piezometers will be installed in the expansion area. <br />