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8 <br />• We have not identified any other landslides outside <br /> the mine area. In view of the favorable hydrological con- <br /> ditions and favorably dipping strata, it is not probable that <br /> any new slides would develop in the vicinity of the mine un- <br /> less they are triggered by inappropriate construction activi- <br /> ties. <br /> 3.2 POTENTIALLY UNSTABLE SLOPES <br /> The same study identified the slopes in the vicinity of <br /> the mine as potentially unstable. A stability problem could <br /> again be encountered if inappropriate construction procedures <br /> are used in this mountainous area. Natural slopes do not <br /> appear to carry any traces of instability. <br />• 3.3 ROCKFALL <br /> Rockfall is a common geologic hazard in mountainous <br /> areas where sandstone cliffs or ledges outcrop along the <br /> slopes. Rockfall is particularly evident along the outcropping <br /> ledge of the Rollins Sandstone Member. Problems of the rock- <br /> fall hazard are evident also along the artificial rock cuts <br /> that have been excavated at the site. <br /> 3.4 EXPANSIVE SOIL AND ROCK <br /> The same study identifies some soils and rock in the <br /> area as expansive. The classification is probably related to <br /> the Mancos Shale that is known to produce expansive soils <br /> when weathered. This problem is limited to the lowest part <br /> of the mine area, as the Mancos Shale outcrops at elevations <br /> cco«mQOCOwann~,wc. <br />