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2 .05.4 (2 ) <br /> (2 ) (a) In Mining Area 3, only two pits were mined in two <br /> strip pits before the mine was idled because its coal sales <br /> contract was not renewed. A total of four 300 ' X 90, pits were <br /> mined from the location of strip pits 2 & 3 as shown on Map 134 . <br /> Only about 10 acres was disturbed. <br /> (b) The amount of performance bond is developed assuming <br /> that the bond would be forfeited at the time reclamation <br /> liabilities were highest during the mining of the four pits. The <br /> worst case would occur when there is the maximum amount of material <br /> in the spoil ridges and in the topsoil stockpile. Approximately <br /> 150,000 cubic yards of spoil was handled during the mining of the <br /> four pits. (4 each X 300 ' X 90 , X 29 , deep X 1.3 swell) . The worst <br /> case would be when two pits were open, therefore 75,000 cubic yards <br /> of spoil would have to be moved to backfill the two pits. <br /> In round numbers the amount of material, measured in <br /> cubic yards, that would be handled to reclaim the mine at the worst <br /> case condition is as follows: <br /> Topsoil 27,000 <br /> Spoil From Ridges 75,000 <br /> • The 27,000 cubic yards of topsoil represents 10 <br /> acres of disturbance in 20" deep topsoil. <br /> The average haul distance from topsoil pile #3 to <br /> the pits in strips 2 & 3 and the average grade is as follows: <br /> Topsoil #3 Topsoil #4 <br /> Haul Distance 1200 ' N/A <br /> Grade 0.0% N/A <br /> • 2.05-20ii September 1993 <br />