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• 103.96' maximum stripping depth <br />79.93' average overburden <br />7.94' Combined Upper and Lower Dakota <br />At the average stripping depth <br />79.93' overburden <br />+ 7.78' coal <br />87.71' material excavated <br />at 15% Swell <br />1.15 x (79.93) = 91.92 material replaced <br />91.92'/87.71' = 1.048 of the initial thickness <br />Therefore, the 0.8 requirement for thin overburden and the 1.2 requirement for thick overburden <br />are not met. <br />• At the maximum stripping depth <br />96.02' overburden <br />+ 7.94' coal <br />103.96' material excavated <br />at 15 % Swell <br />1.15 x (96.02') = 110.42' material replaced <br />110.42'/103.96' = 1.062 of the initial thickness <br />Therefore, the 0.8 requirement for thin overburden and the 1.2 requirement for thick overburden <br />are not met. <br />• (Revised July 2006) 2.05.4(2)(c)-6 <br />