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state Rea. <br />• At the average stripping depth: <br />68' overlxn^den <br />16' coal <br />84' of material removed <br />@ 19.8 swell <br />1.198 x 68' = 81.5' of material replaced <br />81.5' ~ 84' = 0.97 of the initial thickness <br />therefore does not meet either the 0.8 of the initial <br />thiclam~5s requirement for thin overbuttien or the 1.2 of <br />the initial thiclmess requirement for thick overbun9en. <br />• 4.09 DISPOSAL OF F~CCESS SPOIL. All spoil material at the Wadge pit <br />area is used to achieve the appr+~+y»»~te original contour. All <br />spoil material at the Wolf Creek pit area, except that portion <br />of the pit in the western side of the area that was mined in <br />1986 (Wolf Creek Fill), will be used to achieve approximate <br />original contours. <br />INSPFx'I'ION. The Wolf Creek Fill will be inspected for stability <br />by a rerlistered engineer or other qualified professional <br />specialist experienced in construction of earth arri rock fill <br />embarilanents order the direction of a qualified professional <br />enginaar at least quarterly throughout the construction and <br />durir-g the following critical construction periods: 1) removal <br />of all organic material and topsoil; 2) placement of under <br />drainage systems; 3) installation of surface drainage systems; <br />4) placement and compaction of fill materials, arri 5) <br />revegetation. <br />• The qualified registered engineer will provide to the Division, <br />a certified report within two weeks after each inspection that <br />12-61 Revised 10/22/92 <br />