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TO: Steve Reynolds - February 12, 1986 2. <br /> 5. The stability of the landfill and bedrock may be unsafe if quarry <br /> excavations occur close to the landfill . If a pit was excavated below <br /> the landfill surface elevation, and failure planes existed in the <br /> weathered rock, the landfill loading may be able to cause sideway <br /> slippage of the rock into the pit. We would also be concerned about the <br /> potential for leachate to seep sideways into a pit. <br /> Recommendations <br /> 1 . The limits of the landfill and the proposed quarry area should be <br /> correctly shown on a more detailed map. The proposed boundary should be <br /> revised so it does not overlap the landfill . The proposed bottom <br /> elevation of the pit should be identified. <br /> 2. The potential effects of blasting on the creation of cracks in the <br /> weathered rock should be investigated by a qualified expert, such as a <br /> mining engineer. It may be necessary to limit the size of the ulasting <br /> charge, or locations where it could be used. <br /> 3. The potential for sideways failure of the rock should be investigated by <br /> a geotechnical or mining engineer if a pit will be excavated below the <br /> landfill surface. It may be necessary to maintain a minimum separation <br /> distance between the landfill and the sidewalls of any pit. It may be <br /> necessary to restrict the depth of the pit. <br /> 4. Provisions for rerouting the rainfall runoff drainage ditches should be <br /> made. <br /> If you would like to discuss these ideas in more detail , please call <br /> Marie Stewart at (608) 273-5972, or Daniel Carey at (608) 267-7572. <br /> Attachment <br /> cc: Joe Brusca - SD <br /> John DeBeck - Refuse Hideaway Landfill <br /> 9091S <br />