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COAL May 14, 1985 Mr. Thomas Gillis Colorado Mined Land Reclamation Division 1313 Sherman Street 423 Centennial Building Denver, Colorado 80203 Subject: Technical Revision 85-03 South Leases Exploration Plan 1985 - Permit No. C-041-81 Dear Mr. Gillis: In response to the Division's May 2, 1985 letter, Powderhorn Coal Company is submitting the requested additional information to be attached to the subject technical revision application. Powderhorn Coal Company inspected Phase I of the project with BLM officials May 3, 1985. As a result of the BLM's site visit, the ~LM is currently writing an Environmental Assessment for Phase I. The Surface Management Agency (BLM) has requested Powderhorn Coal Company to provide water bars, 18-inch culverts where ephemeral channels cross the road, no stripping of topsoil for drill sites and limited stripping of topsoil for roads. Powderhorn Coal Company committed to the provisions of the Regulations of the CMLRB Rule 4.21 and Rule 4.03.3 in the Technical Revision request of April 2, 1985. We believe there is enough flexability in the rules and regulations to satisfy both the regulatory agencies currently involved. The ephemeral stream channel crossing in the center of the NE~t of Section 11, T11S, R98W of the 6th P.M, shall be constructed with a 5-foot culvert sized for the 10-year 24-hour event with riprap placed on the upstream toe and slope. Additionally, water bars, 18-inch culvert cross drains, surface drainage ditches shall be stratigically placed to allow for protection of the road and to protect the environment from adverse impacts as a result of the exploration activity. Topsoil salvage, where necessary as determined by the Surface Manage- ment Agency i.e., excavated pits, shall include stripping to a depth of 12" or the A horizon and stockpiling of the topsoil in a separate pile near the excavation. POWDERHORN COAL COMPANY • P.O. BOX 1430 • Pallsad& Colorado 81528 • (303) 4847951 ' _: