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renewable resource lands <br />or structures <br /> Predicted impact <br />Item in permit Observed impact Prediction accurate? <br /> application <br /> Maximum 18.4 ft. Between 2000 and 2007 visual <br />Vertical in two-seam mining observations were used for verifying <br />subsidence areas. Less than 1 the conceptual subsidence model, <br />magnitude ft. near panel edges rather than quantitative monitoring. <br /> in single-seam <br />The Spring 2009 report and previous <br />The operator has not completed surveys of subsidence displacements for <br /> mining areas. re- <br />re <br />orts include data from verifying the angle of draw in the E-Seam mining area. Visual observations <br /> p <br />p <br />Horizontal Maximum mining surveys of panel E-1 and the described in the Fall 2009 report indicate subsidence displacements and the <br />displacement horizontal strain of thalweg of the Dry Fork of angle of draw probably are consistent with the predicted values. <br />magnitude 3.9% Minnesota Creek. Postmining <br /> surveys will be conducted after Panel <br /> <br /> E-1 and the Dry Fork are <br />Angle of draw 8 - 21 degrees undermined. <br /> USFS light use roads have been <br /> undermined by the east half of Panel <br /> E-1 since the previous report (Sring <br /> 2009). Other than significant <br /> slabbing of the cliff face next to the <br />USFS roads Rockfalls, cracking West Flatiron road, no new rockfalls Yes <br /> or cracking were found resulting <br /> from previous undermining. (The <br /> West Flatiron site was examined <br /> during the OSM subsidence special <br /> focus oversight inspection in July <br /> 2009. <br /> No new undermining of USFS ponds <br />USFS ponds Draining since previous report (Spring 2009). Yes <br /> No new draining observed from <br /> previous undermining.