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West Elk Mine: Subsidence Evaluation ojthe Revised Mine Pane! <br />avou[c in Section 21 and Sections 26 and 27 Paoe 1 <br />• TABLE 1 <br />SECTION 21 PANELS <br /> Panel Length <br />(feet) Panel Width <br />(feet) Average Overburden <br />Thickness (feet) <br />Original Layout <br />Panell 3300 950 900 <br />Panell 3300 950 1000 <br />Panel3 3300 950 950 <br />Revised Layout <br />Panell 3325 950 1050 <br />Panell 3625 950 850 <br />The Sections 26 and 27 panels have been rotated clockwise approximately 10 degrees <br />from the original layout. The revised panel layout is an echelon configuration, with <br />adjacent panels being offset yet pazallel in a step-like fashion. The key pazameters <br />corresponding to the original and revised layouts aze summarized in Table 2. The panels <br />aze numbered from south to north. The southernmost panel of the revised panel layout <br />• was included in the analysis despite a portion of the panel being outside the permit azea. <br />As with the Section 21 panels, the only pazameter to change significantly is the panel <br />length. <br />TABLE 2 <br />SECTIONS 26 AND 27 PANELS <br /> Panel Length <br />(feet) Panel Width <br />(feet) Average Overburden <br />Thickness (feet) <br />Original Layout <br />Panell 7920 950 1400 <br />Panell 7920 950 1400 <br />Panel3 7920 950 1600 <br />Revised Layout <br />Panell 8800 950 1400 <br />Panell 8750 950 1300 <br />Panel3 8600 950 1400 <br />Panel4 8550 950 1700 <br /> <br />Wnght Water Eng~nerr, lnc. 31-0 1.150 <br />