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12'8d-1997 9:86Ah1 FR011 ENG. WEST ELK 1tINE g78 g2g5850 P. 23 NOV 6'97 15 19 FR BARR ENGINEERING 61Z 832 2601 70 9295595--0626016 P.04/10 1'a 1'1mm Every Plna~ P6:kp H. 9o1MOg 8abjw.4 WM Slk Mier-7.vadflld! tI~W. Nowmbe7 b, 1987 Pto;.oa 06760148WW001 Pa¢4 3 (d) W-1 currently hsa about 82 feet of water sad is slowlp raising after being puozped. Current elevation of water is about 6262. The data indicates that W-1B and W-lE are strongly connected to the pumping well (W-1) and that perhaps W-ID is draining into W-1 from above. Aa intereatiag feature is that the water levels in W-1. W-1B and W IE are at about the same elevation as the observed slip plane in I-6 and I-7. b. The reported °hangup" is I-6 at 78 feet below the ground surface and the ~ "mucky" soil in W-iC at I04foot depth closely match a potential deeper failure plane just above the cobble layer at the oolluvium/bedrock interface. The reported vadds in PP-4 and I-6 (adjacent borings) together with the reported soft drilling conditions immediately below the voids and just above the bedrock also suggest a deeper failure plane above the cobble layer. 6. The reported weak mudstone in the bedrock in boring SB-1 indicates a potential fai]ure plane in the bedrock, at least at the toe of the landslide. The relatively thin interbedded layers of shale, coal and sandstone above the underlying massive sandstone throughout the landslide area suggest a potential for a shear plane within the bedrork if water is present. As indicated by W-1, water is present above the massive sandstone. The massive sandstone, however, appears to be relatively impervious and dry. ?. The fill placed just upslope from the flesh water pond could be blocking the normal seepage paths and cauaiag a `dam". However, discussion with Norm Every indicate that the fill maybe acting ae a buttress in retaining the substation. 0676011\54881.1/CET