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EXHIBIT 15 <br />• TABLE OF CONTENTS -CONTINUED <br />FIGURES <br />15-1 Trough Subsidence Nomenclature (Adapted from Subsidence Engineers <br />Handbook, National Coal Board, 1975) <br />15-2 Relationship of subsidence to width and depth. <br />15-3 Predicted Maximum Subsidence <br />15-4 Graph for predicting maximum slope and strain for various width/depth ratios <br />of panel. <br />15-5 Relationship of Damage to Length of Structures and Horizontal Ground <br />Strain. <br />• NOTE: <br />Figures are located at the end of Exhibit 15 after the subsidence handbook section. <br />• <br />iii <br />PR- o y <br />Z~a~~o 1 <br />