2016-06-24_REVISION - M2006046 (3)

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Greg UiNicld And Associates, PLLC 11-441 NNaning4on Court Phone- (30)346- Fax(3Qi}3t6-6934 Parker, CT) USA SH 38 E-Mail: inf0Xa1e�,,icw biz June 21, 2016 Amy Yeldell Colorado Division of Reclamation, Mining, and Safety 1313 Sherman St, Room 215 Denver, CO 80138 Grand River Pit(M-2006-046) Technical Revision Application Phasing of Operation and Incremental Bonding Dear Ms. Yeldell Western Slope Materials, the operator of the Grand River Pit near Silt, CO are submitting a technical revision application for said operation. This application is to implement incremental bonding for the site,based on the phased nature of the operation. The Table 1 below shows the current disturbance on site in terms of the phases shown on Exhibits C-2 and F in the currently approved permit. Table 1 —Status of Operation Phases Phase Activity Disturbed Area(acres) iB Previous mining area ; <1 acre 2 Current mining area 16.4 acres 3A Production Area(no mining) 20.7 313 Undisturbed 24.34 All mining activity, regardless of phase, is limited to 1000 feet of unbackfilled highwall. Therefore, the maximum possible backfilling needed is that required to take a vertical slope to 31-1:1 V for a height of 25 feet, and along a distance of 1000 feet. The topsoiling requirements of the site area based on a combination of this 1000 feet, and the ancillary disturbed areas in the worst case scenario. As shown in Table 1, no ground water has been exposed in the largest planned mining area(Phase 3A), therefore, the worst case reclamation scenario is the current situation on site: Phases 1B and 2 must be dewatered to complete reclamation. No ground water can be exposed in Phase 3A until Phase 2 reclamation is complete. Western Slope Materials will provide DRMS with a status of each mining phase in the annual report it files. This status will include the disturbance area within the phase, whether or not groundwater is exposed/pumped, and what revegetation has been completed.