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FEB-10-2005 THU 12;15 PM FAX N0, P, Ol/05 TETRA TECH RMC RECEIVED £ ~s 1 0 2Qp~ v Division of Minerals & Geology February 9, 2005 Mr. Larry Oeliler ~ -'7A FAX (303)833-8.106 and US MAIL Division of Minerals and Geology Department of Natural Resources 1313 Sherman Street, Room 215 Denver, CO 80203 R>r: Aggregate Industries-WCR, c.; MLRB Regular 112 Operation Permit Application #M-20!14-OA4, ucsoa South Resource d and Crave! Mine in Adams County; Clarification of Items ~n Dear Larry: On behalf of Aggregate Industries-WCR, Inc, we are writing to provide clarification on two issues raised at the MLR13 Hearing held on January 19`h; the plan for mining Phase 2A, and the plan for Till placement in the West Fill Area. Mining 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 6e 15' except where there are substantial man-made structures within 100'. This restriction is applicable to the Kent house on the property to the west of the Expansion No. 1 area, artd the gas well, the gas pipeline from the gas well, and the access road to the gas weft. In these areas, no mining wild occur without agreement of the owner of the structure, unless the DMG staff has approved a Slope Stability Rnalysis with a lesser proposed setback. 7'he Expansion No. 1 area will not he sealed within the slurry wall, but some of this area will be temporarily de-watered and dry-mined. A water recharge pond will fie utilized to minimize impact to ofj--site alluvial wells. The area will be buckftlled with overburden, sand spoils, as a discharge pond from the plant, and with silt material from the presend discharge pond within the Existing Permit area. The after use will he an unsealed lake and wetlands area a maximum of 21± acres in size with 5± acres of slope and setback areas. Final reclamation of this area will be wildlife hahdtat. " "Mining Teehniyues.....Mining of Phase Swill first involve up to 10~- acres, which is designated as Phase 3~! on Exhibit C-J Pre-Mining/Mining Plan Map. Mining wtthin 200' of the gas well structures is subject to restrictions already outlined earlier in the I9UU 5. SarucL SLY.gr, Suilc I t I nnvmunl, Cc.1 A0501 Tel 3U3.//'/ ;1Q2 Fax ;U?.1,G5.G9S9 www.unncrnm