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At the average stripping depth <br /> 47.8' overburden <br /> 1.7' coal <br /> 8.2' parting <br /> 5.2' coal <br /> 62.9' material excavated <br /> at 15% swell <br /> 1 .15 x (47.8' + 8.21) = 64.4' material replaced <br /> 64.4' c 62.9' = 1.02 of the initial thickness <br /> Therefore, the 0.8 requirement for thin overburden and the 1.2 requirement for thick <br /> overburden are not met. <br /> At the maximum stripping depth <br /> 65.0' overburden <br /> 1.7' coal <br /> 8.2' parting <br /> 5.2' coal <br /> 80.1 ' material excavated <br /> at 15% swell <br /> 1.15 x (65.0' + 8.21) = 84.2' material replaced <br /> 84.2' : 80.1' = 1.05 of the initial thickness <br /> Therefore, the 0.8 requirement for thin overburden and the 1 .2 requirement for thick <br /> overburden are not met. <br /> The maximum and average overburden conditions at Areas 2, 3, and 4 result in ratios <br /> ranging from 0.90 to 0.97 and, therefore, do not meet requirements for either thin or <br /> thick overburden. <br /> In the Nucla East permit area, the requirements of either the thick or thin overburden <br /> regulations are also not met as shown by the following calculations: <br /> 20-3 Revised 04/11/88 <br />