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CHAPTERFOUR Environmental Consequences and Mitigation <br />Rockfall Hazards <br />Based on project plans to date, a conveyor and mine portal access road will cross the boundary of <br />the rockfall hazard area. Constructing these facilities will undoubtedly change the existing <br />natural conditions. Therefore, site-specific engineering designs and rockfall mitigation measures <br />will be necessary to ensure the safety of both infrastructure and personnel in these areas. Slope <br />stability studies and, where appropriate, rockfall stability analyses should be completed for <br />structures proposed in the rockfall hazard area. <br />Landslide Hazards <br />If the practice of avoidance is adopted for the proposed construction, risks associated with future <br />movement of the landslide deposit are considered low. <br />Accelerated Erosion <br />Project plans should be guided by an engineering firm qualified in geotechnical engineering <br />design. <br />During periods of isolated heavy precipitation or rapid snowmelt, accelerated erosion is <br />exaggerated. Site-specific engineering designs and mitigation measures should be developed to <br />control the flow of surface water away from the upstream headward erosion scars of the two <br />zones. <br />Other Geologic Hazards <br />Although the anticipated loadings from the proposed Red Cliff Mine facilities will be relatively <br />large, foundation designs should be based on results of laboratory swelUconsolidation testing. <br />Foundation designs should be guided by results of swelUconsolidation laboratory testing. <br />Alternatives Carried Forward for Further Consideration <br />Grade-Separated Crossing at CR M.8 <br />No appreciable impact to the geologic and mineral resource is anticipated. <br />Four-Quadrant Traffic Control Devices <br />No appreciable impact to the geologic and mineral resource is anticipated. <br />Transmission Line Alternative A <br />No appreciable impact to the geologic and mineral resource is anticipated. <br />Transmission Line Alternative B <br />No appreciable impact to the geologic and mineral resource is anticipated. <br />Transmission Line Alternative C <br />No appreciable impact to the geologic and mineral resource is anticipated. <br />4-75 <br />DBMS 630 <br />