2009-06-19_PERMIT FILE - C1996083A (9)

Home Browse Search

i Construction The total disturbed area of the coal mine waste disposal operation (Gob Pile No. 2) is approximately 50 acres, including the required, stockpiles, borrow areas and sedimentation controls. Gob Pile No. 4 added another 5 acres of disturbance. The capacity of the refuse disposal site (Gob Pile No. 2) is approximately 2,000,000 cubic yards. The maximum height between the toe of the proposed fill and its ultimate top is approximately two hundred and forty feet. The capacity of Gob Pile No. 4 is approximately 300,000 cubic yards. The first task of the construction of the coal mine waste disposal area was the construction of the sedimentation pond and associated collection and diversion ditches. The second task was the stripping of topsoil, removal of all organic material and salvaging cover material. The third task was the installation of the lateral drains, rock under-drains and excavation of the toe key into competent material as per the recommendation of the following Lambert & Associates= report. • The soil material exposed in the clearing and grubbing operations was compacted prior to material being placed. The first 50-foot lift, which encompassed the lower 7.5 acres of waste disposal site was initially cleared of trees and heavy brush. The footprint of the topsoil and coverfill stockpiles was also cleared of trees and heavy brush. The trees and heavy brush were stockpiled and burned. After the site was cleared of trees and heavy brush, topsoil, organic material and vegetation (including sagebrush) was stripped together and stockpiled in the topsoil storage area. Approximately 50,000 cubic yards of topsoil was salvaged for the entire extent of the pile. Coverfill was salvaged and stockpiled in the designated area. Approximately 28,000 cubic yards were salvaged and stockpiled. Gob pile number 4 was constructed on the borrow area approved by technical revision number 43. 1] TR-61 -4- 04/09 /I per, 0 vc'f-? 6 [/ 9/0'7