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GEOTECHNICAL STABILITY EXHIBIT <br /> There are no buildings or any structures outside the permit area which could be affected by the <br /> excavation. <br /> From Table 2.5 in the SME Mining Reference Handbook', the backfill is best classified as sand <br /> and gravel, mixed grain size. This material has an internal angle of friction of approximately 48 <br /> degrees, a unit weight of 110 lbs/ft3, and no cohesion. <br /> The nearest offsite structure not owned by the applicant is the county road along the east side <br /> (CR 29). This road is over 50 feet from the mining slope. The fence along the property and <br /> permit boundary is owned by both the landowner and by the county. Therefore,the mining pit <br /> crest is not allowed closer than 50 feet to the permit boundary. <br /> 1. Slope Stability Scenarios Analyzed <br /> Given the presence of the 100-YR floodplain,the proposed maximum mining slope (2H:IV) at <br /> the extent of the mining areas was evaluated for dry conditions, flooded conditions, and rapid <br /> drawdown conditions. GALENA software was used to find the failure slopes for these conditions <br /> using Bishop's Method of Slices. Result figures are shown below for each set of conditions with <br /> the GALENA data output included at the end of this exhibit. <br /> l� <br /> c�a <br /> 0047151�m J- :5, <br /> 1-2 31//8 <br /> Original source:Houk and Bray 1977 <br /> Yevoli Cobblestone Pit Grrp lewuh and�s+x alc.,i'LI <br /> December 2018 GS-1 <br />