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2.05.4(2) Ic) Backfilling and Grading <br />• Spoil and overburden from the first pit in Area 1 <br />and the first pit in Area 2 will be excavated and placed off the <br />coal in temporary spoil piles 1 and 2 respectively. After the <br />removal of all recoverable coal from the first pit, the overbur- <br />den and other spoil material from the second pit will be back- <br />filled into the first pit. Spoil from the temporary spoil piles <br />will be placed in the last pit in the respective mining areas. <br />Regrading will commence with the progression of <br />the next pit beyond the first pit. After the removal of all <br />recoverable coal from the first pit, the overburden and other <br />spoil material from the second pit will be backfilled into the <br />first pit. Backfilled material will be handled by scrapers or <br />other rubber tired or tracked equipment, and will be compacted <br />and stabilized as it is handled. Any necessary grading will be <br />done by dozers with finish work done by motor graders or pull <br />type scrapers. Regrading will continue from pit to pit with the <br />overburden and spoil material from the advancing pit being placed <br />in the mined out adjacent pit. SauK-h_=bs.okfilling and grading <br />shall be completed within 180 days following coal removal and <br />will not be more than four spoil ridges behind the pit being <br />worked, the spoil from the active pit being considered the first <br />pit. <br />~ The last. pit in each of the two mining areas is a <br />concern with regard to achieving approximate original contours. <br />• In each case the plan is to load haul and place the spoil pile <br />from the first pit into the last pit of the respective mining <br />area. <br />The tabulation in section 2.05.3(61 shows the <br />spoil volume and void volume for each pit. It can be seen from <br />this tabulation that the spoil from the first pit in each mining <br />area will provide adequate backfill material for the last pit in <br />the respective mining area. The material balance from one pit to <br />the adjacent pit can also be determined. <br />• 2.05-21 May 1991 <br />