2010-05-03_REVISION - M1977344 (3)

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Quarry Department - Portland Plant April 22, 2010 Mr. Berhan Keffelew It 0 Holcim (US) Inc. Phone 719-784-6325 ct?-. 3500 State Hwy 120 Fax: 719-784-3470 Holcim Florence, CO 81226 www.holcim.com/us Environmental Protection Specialist IAY 0 3 2010 Division of Reclamation, Mining, and Safety Didion of R.-cWTO!", 1313 Sherman Street, Room 215 -V ltliinir g and Stt%ty Denver, Colorado 80203 Subject: Technical Revision 9 to Mine Permit # M-197-344 - Request to landfill reject coal in Quarry Dear Mr. Keffelew: Holcim (US) Inc. is submitting a request for a Technical Revision JR) to DRMS Permit No. M- 1977-344. This TR is requested to landfill "Distressed Coal" inside the permitted mine area in the quarry. The coal originated in the Powder River Basin of Wyoming. The coal contains inert rock of various sizes. In 2009 Holcim screened the material to separate the rock and coal for use in Holcim's kiln. Holcim is requesting to landfill the screened reject product in the quarry. The estimated volume of the reject material is 20,000 tons. The reject material will be hauled to the quarry by dump trucks. The material will be placed in 2 foot lifts, spread using a D9R Dozer and stabilized to a 3:1 slope. After the haulage is completed the landfilled area will be covered with topsoil and seeded with native grasses consistent with Holcim's reclamation seeding plan. Figure 1 shows the location the material will be landfilled and the materials current location at the plant. The landfilled area will not affect the approved reclamation plan for the quarry since the landfill is outside of the current mine area. The rejected material consists of rock and stone with approximately 35% coal. The material will not release any pollutants to the groundwater nor will it affect the surface drainage system in the area. Plate 2: Wider view of screened reject Plate 1: Close-up view of screened reject