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Greg Le`vicki And Associates, PLLC <br />llatl Nkarring-ton Court Panne: (303) 316$196 Far (303)-316-6931 <br />Parliur, CO (SA 80138 E -Mail: infuralerricldhic <br />June 21, 2016 <br />Amy Yeldell <br />Colorado Division of Reclamation, Mining, and Safety <br />1313 Sherman St, Room 215 <br />Denver, CO 80138 <br />Grand River Pit (M-2006-0467 Technical Revision Application <br />Phasing of Operation and Incremental Bonding <br />Dear Ms. Yeldell <br />Western Slope Materials, the operator of the Grand River Pit near Silt, CO are submitting a <br />technical revision application for said operation. This application is to implement incremental <br />bonding for the site, based on the phased nature of the operation. The Table 1 below shows the <br />current disturbance on site in terms of the phases shown on Exhibits C-2 and F in the currently <br />approved permit. <br />Table 1— Status of Operation Phases <br />Phase Activity Disturbed Area (acres) <br />is _ Previous minirLarea — T l - TT— _ _ , <1 acre <br />2 Current minina area 16.4 acres4 <br />3AProduction Area (no mining) ;_20.7 _ <br />36 Undisturbed 24.34 <br />All mining activity, regardless of phase, is limited to 1000 feet of unbackfilled highwall. Therefore, <br />the maximum possible backfilling needed is that required to take a vertical slope to 3H:1 V for a <br />height of 25 feet, and along a distance of 1000 feet. The topsoiling requirements of the site area <br />based on a combination of this 1000 feet, and the ancillary disturbed areas in the worst case <br />scenario. <br />As shown in Table 1, no ground water has been exposed in the largest planned mining area (Phase <br />3A), therefore, the worst case reclamation scenario is the current situation on site: Phases 113 and 2 <br />must be dewatered to complete reclamation. No ground water can be exposed in Phase 3A until <br />Phase 2 reclamation is complete. Western Slope Materials will provide DRMS with a status of each <br />mining phase in the annual report it tiles. This status will include the disturbance area within the <br />phase, whether or not groundwater is exposed/pumped, and what revegetation has been completed. <br />