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._ <br />J. E. STOVER 8 ASSOCIATES <br />2768 COMPASS DRIVE, SUITE 101 <br />GRAND JUNCTION, COLORADO 81506 <br />PHONE: (970) 245101, FAX 242-7908 <br />MINE ENGINEERING <br />MINE RECLAMATION <br />August 13, 1999 <br />Dan T. Mathews <br />Division of lvfinerals and Geology <br />2148 $roadway, #CS <br />Grand Junction, CO 81503 <br />Re: Roadside Portals (Permit No. C-81-041) <br />Minor Revision No. 40 <br />Bowie Refuse Quantity <br />Deaz Mr. Mathews: <br />III IIIIIIIIIIIII III <br />CML ENGINEERING <br />COdST. MANAGEMENT <br />~'~~~ <br />AUG 1 g 1999 <br />DIV QS.AAINFpei c o .. ~... ..... <br />,. <br />. _ „tom,-v:. <br />The DMG's letter dated August 9, 1999 requested information regarding the projected quantity of <br />refuse to be generated by washing of the Bowie Coal. The request is to substantiate the assumption <br />regarding lack of impact to refuse pile stability, due to the "insignificant amount" of Bowie coal to <br />be processed. On behalf of Powderhorn Coal Company, the following information is presented: <br />For the period February through July 1999, a total of 58,625 tons of preparation plant reject were <br />hauled to the refuse piles. Of this amount, 12,950 tons or 22% was attributable to washing Bowie <br />coal. A table is enclosed which presents a detailed listing of coal deliveries, sales, plant yield and <br />reject quantities. <br />Although 22% may not be considered insignificant, considering the fact that Bowie refuse is being <br />placed on the upper lifts of the refuse piles, its impact on the stability of the piles is believed to be <br />insignificant. If this material were to be placed in the lo~.ver level of a new reP~se pile, it would be <br />appropriate to analyze the stability of the pile with a mix of refuse. <br />Please let me know if you have any questions. <br />Sincerer <br />~~ <br />J. E. Stover, P.E. <br />Consulting Engineer <br />cc: Resource Area Manager <br />BLM Grand Junction Resource Area <br />