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., <br />~. <br />Notm Every -2- November 12, 1996 <br />Mountain Coal Company <br />1. The actual refuse material strength parameters may be higher than were created in the <br />laboratory. Additional testing of the actual pile material may prove useful in determining an <br />adequate safety factor. <br />2. The embattlnrten[ could be zoned, to specifically place stronger materials at the interior. <br />3. The facial slope angle can be reduced by regrading the potentially unstable area. <br />4. The overall height of the pile can be reduced. <br />5. The substandard slope segment could be buttressed adjacent to the slope toe. <br />These are only suggestions and they are not all inclusive. <br />In the interim, DMG recommends that MCC stop placement of refuse on the potentially substandard portion <br />of the Lower Refuse Pile, specifically the eastern facial area of the pile. MCC may continue to place refuse <br />on the remaining portions of the Lower Refuse Pile. This restriction should remain in place until the safety <br />factor inadequacy has been resolved. <br />Please call if you have any questions. <br />Sincefely, <br />~''. - <br />;% <br />David Berry <br />Senior Environmental Protection Specialist <br />cc: Jim Pendleton <br />Mike Boulay <br />M'\ov\YmH\EVERY.DAB <br />