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analyses, indicated that the coal refuse pile will have a factor <br />• of safety greater than 1.5. At the worst case, the only point of <br />instability which could occur would be at the toe of the slope <br />due to a high buildup of the phreatic surface. Rather than <br />building expensive subdrain systems, it is recommended that a <br />monitoring program be initiated involving the installation of <br />several piezometers located along the toe of the coal refuse <br />piles. If high phreatic surfaces do develop unexpectedly, a toe <br />drain to be built adjacent to the refuse pile could be <br />constructed at this time. These piezometers will be monitored by <br />Powderhorn Coal Company. <br />• <br /> <br />15 <br />