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~' ,S III IIIINIiliiii iii July 21, 1982 ~L'L 2's 1982 Mr. Jim Herron Colorado Mined Land Reclamation Division 1313 Sherman Street, Room 423 Denver, Co 80203 rJ ~., ~ ~ ~ M1.q ~ 1~ Y,ti, Y' ~/ .r~+j ~,.,_ .Q V~J "ar'l~..rL NIIP.I~~ ! ,,nir~ ~rv.l^r>/1:',lION' Colo. Depl. of , ~;;;:~a Resources RE: Minor Revision for Powderhorn Coal Company Permit Application C-041-81 Sedimentation Control Plan Cameo No. 1 and Roadside Mines. Dear Mr. Herron: Please find enclosed design calculations, maps, and plans for a minor re- vision to the Sedimentation Control Plan for Permit Application C-04i-81. Powderhorn Coal Company is requesting the minor revision because of field design changes and modifications due to environmental, safety and economical factors. The minor changes, as proposed, will not cause any significant alterations in Powderhorn Coal Company's reclamation plan. ROADSIDE MINE See Exhibits 68, 20, 22 New Sediment Pond Number 9 was designed for the southwest corner of the property. This pond will intercept run-off from about 20 acres of land. The North diversion ditches and associated flumes were deleted. These ditches were designed to intercept a relatively small amount of run-off at a relatively high environmental, safety and dollar cost. Sediment Pond Number 8 is designed to handle the additional run-off anticipated because the North diversion ditches were deleted. It is coincidence that the previous pond number 8 design is adequate for the new run-off calculations for pond number 8. The pond was reshaped to reflect actual field conditions. The spillway for pond number 8 has been revised from a one-half round, 48- inch culvert to three arch pipe 35" x 24". A 600 gpm, portable pump wilt be available on the property to dewater the pond after a 10-year, 24-hour precipitation event. The lower catch ditch no longer runs across the toe of the refuse pile. This change was necessitated by two factors; first, the ditch would have to be lined at substantial cost and secondly, stability of the Roadside POWDERHORN COAL COMPANY P.O. BOX 1430 Palisade, Colorado 81526 • (303) 464.7951 COAL COMPANY