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STATE OF COLORADO <br />DIVISION OF MINERALS AND GEOLOGY <br />Department o(Natural Resources <br />7313 Sherman St., Room 215 <br />Denver, Colorado 80203 D t v I S t O N O F <br />Phone: (303) 866-3567 MINERAL S <br />FAX: (303)832-8706 & <br /> GEOLOGY <br /> RECLAMATION <br /> MINING•SAFETY <br />April 23, 2003 <br /> <br />Robert Shevling Bill Owens <br />covemnr <br />Seneca Coal Company Greg E. Watcher <br />P.O. BOX 670 Executive Director <br />Hayden, CO 81639 Ronald w.cana„y <br /> Acting Division Director <br />RE: Seneca II-W Mine (Permit No. C-1982-057) <br />Technical Revision No. 42 (TR-42) <br />Access Road and Drainage Control Modifications <br />Dear Mr. Shevling: <br />The Division has conducted a preliminary adequacy review of the referenced technical <br />revision application. Our comments are itemized below. <br />1. There appear to be some errors on amended Exhibit 12-2, with respect to Haul Road <br />designations. Haul Road G from the county road up through the D Pit reclamation area is <br />erroneously designated as Haul Road J. Road A from the vicinity of Pond 006 up to the <br />vicinity of Topsoil Pile J appears to be erroneously designated as Road H. Road H along the <br />A Pit area eastern ridgeline appears to be erroneously designated as Road A. Some of these <br />errors also appear on amended Exhibit 13-2. Please address these apparent errors and <br />amend the exhibits as appropriate, with the start and end points of each designated haul . <br />road clearly and accurately delineated. <br />2. Amended Exhibits 12-2 and 13-2 depict a pit area immediately east of Pond 006 as <br />being operational during 2002/2003, designated "A" Pit. Our understanding is that this is <br />actually a portion of the Pit "B" area, which still contains a small amount of coal. Please <br />clarify and amend the Exhibit as appropriate. <br />3. Amended Exhibit 13-2 shows two culverts along the existing interim oil well access <br />road, an upper 30" culvert and lower culvert of unspecified diameter. Calculations <br />documenting the adequacy of the culverts to pass the design storm event were not <br />provided. Please specify culvert diameter for both culverts on the appropriate exhibit, and <br />provide appropriate calculations documenting that the culverts are adequately sized to <br />safely pass the design flow. <br />4. Light use or access roads to Sediment Ponds 016 and 017 are depicted on amended <br />Exhibit 13-2A, but design detail demonstrating compliance with applicable regulations was <br />nqt provided. Please identify the roads to Ponds 016 and 017 as "access" or "light use". <br />roads as appropriate, and provide the appropriate design information. Also, please update <br />the access road or light use road text within Tab 13 as appropriate. <br />5. The interim access road profile on new Exhibit 13-25.1 does not extend to the <br />upper end of the road shown on the plan view. Please amend the profile to extend through <br />