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J. J. Dudash -2- October 26, 2009 <br />BRL does not agree that outcrop barrier failure caused the June 2007 <br />landslide. On the east end of B-6 panel, the projected burn line is in excess of <br />500 feet below the surface. Both the B-Seam and D-Seam are burnt in this <br />area. Many years ago the burnt seams created a void space so the <br />overburden lost its support and subsided. The subsidence resulting from the <br />burnt coal caused instability in the area of the June 2007 landslide. Historic <br />instability is documented on Map 08, Geologic Hazards, which shows <br />downward pointing arrows in the location of the landslide which indicates <br />debris avalanche. The most likely trigger for the June 2007 landslide was the <br />initial roof fall in the B-6 panel, not outcrop failure. <br />Please call with any questions. <br />Sincerely, ^ <br />J. E. Stover, P.E. <br />Consulting Engineer <br />cc: Wm. A. Bear, Jr.