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Table 1 <br /> Table 1. Existing Structure and Setback Agreements <br /> Structure Owner Closest Distance to <br /> Mining <br /> Gust B&Sharon K Geraft <br /> Fence 2778 Sunburst Or 5 <br /> Medina,OH 44266 <br /> Grand County <br /> Road 467 E Topaz Ave 55 <br /> Granby,CO 80446 <br /> Motes Moss Electric <br /> Power pates and Mines 321 Vest Agate Avenue 6 <br /> Granby,CO$0446 <br /> Note:These structures and setbacks were compiled from aerial photography and operator knowledge. <br /> 2. Slope Stability Analysis <br /> A slope stability analysis was performed using GALENA Slope Stability Software, assuming the <br /> ground conditions described in the DRMS permit. The mining plan calls for slopes along the edge of <br /> the permit area to be mined to the final condition of 3HAV. The model assumes no topsoil or <br /> overburden as the final slope will be mined to, not backfilled. The strength of the in-place sand and <br /> gravel will determine the stability of the slope. The water table is identified in the mining plan of the <br /> existing permit as being below the bottom of the fully mined out pit and is thus placed below the <br /> model bottom. The material used in the slope stability analysis is sand and gravel- mixed grain size <br /> for the aggregate The material properties for these two materials are shown in Table 2 below. <br /> Table 2—Material Properties <br /> DepositAggregate <br /> Doa# to sand and gravel,mixed <br /> rain size <br /> Unit Weight(lbs/ft') 110 <br /> Frlcti m Ark&(° 45 <br /> Cohesion 0 <br /> *Material information is from the SME Mining Reference Handbook(2002 Edition).Values used are the lowest of any <br /> ranges.' <br /> Using these conditions, the failure slopes for the final mining and reclaimed slopes were determined <br /> using Bishop's Method of Slices to identify the circular failure at various factors of safety (FOS). The <br /> Table 2.5; Originally from Houk and Bray, 1977 <br /> Kattenberg Pit Slope <br /> Stability 2 Lewicki 81 Associates <br /> December 2022 <br />