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XXI. RULE 6.5 - GEOTECHNICAL STABILITY EXHIBIT <br />The geotechnical stability exhibit requirements dictate that the applicant address four <br />additional potential areas of concern related to mining activities on a site-specific basis. <br />These are: <br />1) geologic hazards <br />2) engineering stability analyses <br />3) off-site impacts due to failure of geologic structures or constructed earthen <br />facilities <br />4) blasting considerations <br />The applicant believes that only one of these four topics requires special discussion or <br />planning for DRMS approval of the proposed Bromley Lakes expansion and changes to <br />the permit that comprise this proposed Amendment No. 2 to the existing permit. Brief <br />explanations of each of the three categories considered not applicable followed by a <br />discussion of the fourth, engineering stability analyses, is provided below as the <br />geotechnical stability exhibit for this permit amendment application. <br />None of the common geologic hazards are expected to adversely impact the proposed <br />amended operation. The site geology and physiography do not include the potential for <br />earthquake hazards, natural slope movement hazards, volcanic hazards, subsidence <br />hazards, or methane gas hazards that could impact the operation. Flooding is the only <br />geologic hazard that could impact the site. However, no new fixed operations are planned <br />and all processing will be done at the existing, permitted, Bromley Lakes Pit plant to the <br />north of the expansion area. All new ponds and water storage areas will be constructed <br />below the floodplain. And reclaimed cropland backfill areas will be restricted to outside <br />the floodplain and constructed to approximately pre-mining topography. <br />Field conveyors will be set at elevations above expected flood stages. Portable <br />equipment and vehicles can be moved to elevations above the 100 year floodplain within <br />the property or at the adjacent mining site in the event of rising flood waters. <br />Construction of the mined phases and ultimately the sealed water storage reservoir will <br />67