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(i.e., ditches, berms, impact walls) may be required to reduce the risk of rock blocks <br />falling into the working area or damaging equipment. <br />2. Fill Area H and begin excavation above the highest tension cracks and lay back the <br />slope. This will likely require additional USFS area above the mine, pioneering new <br />access ramps, and adversely raising the visual scar of the mine. <br />A qualified consultant or specialty instrumentation firm should be used to develop and <br />install a short-term and ongoing monitoring program. A professional geotechnical engineering <br />consultant should design stabilization methods for the quarry. CGS is available to review <br />proposals and offer suggestions if DRMS desires further assistance with this aspect. If you <br />have any questions about the content of this memorandum please call Jon White or TC Wait at <br />(303) 866-2611, exts. 8332 or 8330. <br />Cc: Sares, Matthews, CGS <br />Geologic map reference <br />Morgan, M.L., Siddoway, C.S., Rowley, P.D., Temple, J., Keller, J.W., Archuleta, B.H., and <br />Himmelreich, Jr., J.W., 2003, Geologic Map of the Cascade Quadrangle, El Paso <br />County, Colorado, Colorado Geological Survey Open-File Report 03-18, Denver, CO, <br />1:24,000-scale. <br />12