Laserfiche WebLink
Construction <br />The total disturbed area of the coal mine waste disposal operation (Gob Pile #2, <br />and the Gob Pile #2 Expansion area) is approximately 58.0 acres. The capacity <br />of Gob Pile No. 2 is approximately 3,300,000 CY. The maximum height between <br />the toe of the fill and its ultimate top is approximately three hundred and fifty feet. <br />The capacity of the west expansion area (aka gob pile #4) is 500,000 cubic <br />yards. The maximum height between the toe of the fill and its ultimate top is <br />approximately one hundred sixty five feet. <br />The first task of the construction of the coal mine waste disposal area was the <br />construction of the sedimentation pond and associated collection and diversion <br />ditches. The second task was the stripping of topsoil, removal of all organic <br />material and salvaging cover material. The third task was the installation of the <br />lateral drains, rock under -drains and excavation of the toe key into competent <br />material as per the recommendation of the Lambert & Associates report dated <br />November 10, 2003. <br />The soil material exposed in the clearing and grubbing operations was <br />compacted prior to material being placed. <br />The first 50 -foot lift, which encompassed the lower 7.5 acres of waste disposal <br />site was initially cleared of trees and heavy brush. The footprint of the topsoil <br />and coverfill stockpiles was also cleared of trees and heavy brush. The trees <br />and heavy brush were stockpiled and burned. After the site was cleared of trees <br />and heavy brush, topsoil, organic material and vegetation (including sagebrush) <br />was stripped together and stockpiled in the topsoil storage area. Approximately <br />50,000 cubic yards of topsoil was salvaged for the entire extent of the pile. <br />Coverfill was salvaged and stockpiled in the designated area. Approximately <br />28,000 cubic yards were salvaged and stockpiled. <br />The west expansion, otherwise known as Gob pile number 4, was constructed <br />on the borrow area approved by technical revision number 43. The site was <br />initially cleared of trees and heavy brush. After the site was cleared, organic <br />material and vegetation was stripped and stockpiled in the topsoil storage area <br />Approximately 6,900 cubic yards of topsoil and nearly 180,000 cubic yards of <br />coverfill material were salvaged. <br />TR -98 - 6 - 04/15 <br />