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J. E. STOVER & ASSOCIATES <br />z7es co~ASS DR1vE, surrE lol <br />GRAND JiTNCTION, COLORADO 81506 <br />PRONE: (970) 245-4101, FAX 242-7908 <br />MINE ENGINEERING <br />MIIYE RECLAMATION <br />RECEIVED <br />CIVIL ENGINEERING <br />CONST. MANAGEMENT <br />~;OV u ~ 1998 <br />October 28, 1998 <br />DiY~s~on at Minerals & Geology <br />J. J. Dudash <br />Division of Minerals & Geology <br />1313 Sherman St., Room 215 <br />Denver, CO 80203 <br />Re: Bowie No. 1 Mine <br />Technical Revision Application <br />East Ridge Waste Disposal Area <br />Permit C-81-038 <br />Dear Mr. Dudash: <br />In a letter dated February 20, 1998, BRL committed to permit an expansion of the coal waste <br />disposal area. The expansion was based on the East Ridge Pile and 49 Yeaz Pile Conceptual <br />Designs presented on Map Nos. 6A-lE and 6A-1F respectively, presented in Volume 6A. <br />Enclosed is an application for a technical revision to provide for the final design of the east ridge <br />waste disposal site. <br />The application finalizes the conceptual waste rock disposal site design prepared by Geo-Hydro <br />Consulting Inc. in December of 1982. The site is located on the east side of the existing West <br />Ridge Waste Disposal Pile. The East Ridge Waste Pile footprint differs slightly from the original <br />conceptual design. The East Ridge Waste Pile configuration, benches, slopes, stability, access <br />and construction methods are in conformance with the West Ridge Waste Pile design. Although, <br />most of the site is located in an area that has been previously disturbed, new surface drainage <br />designs are needed. The East Ridge Waste Pile was designed with side slopes of 2(II):1(V) with <br />10-foot benches located at a vertical spacing of no more than 50 feet, which will conform with the <br />existing West Ridge Pile and the original design. <br />Since the slopes and waste pile configuration of the East Ridge Pile are the same as the West <br />Ridge Pile, and the waste material properties have not changed, no further stability analysis aze <br />considered necessary. Slope stability analysis of the West Ridge Pile configuration indicate the <br />factors of safety are satisfactory. Over fifteen yeazs of experience with this slope configuration <br />and construction method has proved the design of the pile is adequate from a stability point of <br />view. <br />