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,/ TETRATECH RMC / ~ - __ ..__.. February 9, 2005 Mr. Larry Oehler Division of Minerals and Geology Department of Natural Resources 1313 Sherman Street, Room 215 Denver, CO 80203 VIA FAX (303)832-8106 and US MAIL RE: Aggregate Industries-WCR, Inc.; MLRB Regular 112 Operation Permit Application #M'~004-044; Tucson South Resource Sand and Gravel Mine in Adams County; Clarification of Items ~ Dear Larry: On behalf of Aggregate Industries-WCR, Inc., we are writing to provide clarification on two issues raised at the MLRB Hearing held on January 19"'; the plan for mining Phase 2A, and the plan for fill placement in the West Fill Area. Minin¢ Plan for Phase 2A: The intent for mining this 27+ acre area is unchanged from the current permit, Amendment M-91-140. This permit refers to this 27+ acres as the "Expansion No. 1 area/Phase 3". Exhibit D-1 of the Mining Plan for Amendment M-91-140 states: "The Expansion No. 1 area is designated as Phase 3, is 27+ acres in size, and would be completely mined, except for required setback areas. Mining setbacks will be 25' except w9eere there are substantial man-made structures within 200'. This restriction is applicable to the Kent house on the property to the west of the Expansion No. 1 wren, and the gas well, the gas pipeline from the gas well, and the access road to the gas well. In these areas, no mining will occur without agreement of the owner of the structure, unless the DMG staff has approved a Slope Stability Analysis with a lesser proposed setback. The Expansion No. 1 area will not be sealed within the slurry wall, but some of this area will be temporarily de-watered and dry-mined. A water recharge pond will be utilized to neinimize impact to off-site alluvial wells. The area will be backfilled with overburden, sand spoils, as a discharge pond from the plant, and with silt material from the present discharge pond within the Existing Permit area. The after use will be an unsealed lake and wetlands area a maximum of 22+ acres in size with S± acres of slope and setback areas. Final reclamation of this area will be wildlife habitat. " `Mining Techniques....Mining of Phase Swill first involve up to 10+ acres, which is designated as Phase 3A on Exhibit C-1 Pre-Mining/Mining Plan Map. Mining within 200' of the gas well structures is subject to restrictions already outlined earlier in the 1900 S. Sunset Street, Surte I -F, Longmont, CO BO501 Tel 303.772.5282 Fax 3D3.665.6959 www.ttrmcmm