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(~ <br />Memo to Dan Mathews <br />Red Canyon Mine Structure Examination <br />page 5 <br />A second network of timber pillars was subsequently installed. Six-inch thick concrete pads <br />were poured on grade, approximately a yard square. Several of these pads were poured over and <br />around the bases of the timber/concrete block pillars, allowing me to deduce that they post-date <br />the earlier timber block pillars. Large log timbers (8 to 12 inches in diameter) were then cut to <br />exact length and hammered into place beneath the trailer steel framework. All of these timbers <br />appear to be tightly fit, even though no wedges were used between the timbers and the frame of <br />the trailer. The tenant occupant of the trailer reported that a carpet layer recently reported that the <br />floor at one end of the trailer has deflected. I suspect that hydraulic jacking and the installation <br />of metal plates could relevel the floor with minimal difficulty and expense. My examination <br />detected no evidence of subsidence impacts upon the Truitt mobile trailer. <br />Surficial Cracking on the Arney Property <br />I accompanied you to the site of the repaired cracks on the Amey property. Mr. Stover, on behalf <br />of MinRec had repaired the cracks at your direction. No subsequent cracking has occurred. <br />Your preliminary conclusions hypothesizing separation of consolidating backfill along the <br />original highwall of a surface contour bench appear to be a plausible explanation for the semi- <br />circularnear surface crack in uncompac[ed fill on the Arney property. My examination detected <br />no evidence of subsidence impacts on the Arney property. <br />cc: Larry Routten <br />doc: M:\COALUAP\redcanin.wpd <br />JP/jP <br />