PERMFILE44073 - Laserfiche WebLink

Home Browse Search

A summary of the topsoil stockpile azeas is given below: • 1. Stockpile #1: Main Stockpile located north of County Road containing 5,900 cy from the initial stripping of Area 2 plus 1,300 cy from Area 1 for a total estimated volume of 7,200 cy. The stockpile azea shown on Map C-2 is lazger than necessary to store 7,200 cy, so there is extra storage space available in case the average stripping depth is greater. 2. Stockpile #2: Located at Watet Treatment Area with an estimated volume of 4,200 cy. 3. Stockpile #3: Located at Whirlwind portal bench with an estimated volume of 3,900 cy. Total estimated topsoil storage required: 15,300 cy Temporary topsoil stockpiles will be created in front (i.e., east) of the waste rock pile as it expands. This material will be used to concurrently reclaim the north facing waste rock pile slopes next to County Road 5/10 after they are regraded to a 3H:1 V configuration. • Each topsoil stockpile will have a small, one-foot high berm along the perimeter to isolate it from the surrounding azea runoff and to trap runoff from the stockpile itself within the ditch created by the berm. All stockpiles that will be in place for more than one yeaz will be seeded using the prescribed mix shown in the Reclamation Plan. Pond Excavation After topsoil is removed to an average depth of 16 inches over the water treatment and sediment pond azea, the ponds will be excavated. Some of the excavated material will be used to build up the treatment azea to a nominal elevation of 7,050 feet and to construct a 1.5-foot high berm with 2H:1 V side slopes azound each of the lined ponds. These berms will prevent runoff from entering the treatment system. The remaining volume of subsoil will be in a stockpile located east of the ponds as shown on Map C-2.. The estimated volume of subsoil removed and stockpiled from the ponds is summarized below: ~~ Whirlwind Mine June 07 D-17