PERMFILE60742

• Permit No: C1980004A
• IBM Index Class Name: Permit File
• Doc Date: 9/7/2004
• Section_Exhibit Name: Section 3.0 Reclamation Plan
• Media Type: D
• Archive: Yes

3~7
3,2 TOPSOIL REMOVAL AND STORAGE
• Two soil units occur in the 0.5 acre area of the sediment pond, the Rivra gravely sand loam
variant (0.2 acres) and Nihill loam (0.3 acres). Recommended stripping depths are 12 inches
and 18 inches, respectively, based upon data presented in Table 4.4-2, Soils Inventory, McClane
Canyon Mine (WRDC 1982a).
Volumes of topsoil available for stripping and stockpiling have been calculated from the area
of the soil mapping units and recommended stripping depths. A total of 0.56 acre-feet (900
bcy) of soil will be salvaged from the sediment pond area.
The topsoil storage area is adjacent to the sediment pond. Vegetation will be stripped from
the storage area prior to stockpiling. The stockpile area is about 8,400 sgft (0.2 acre). The
volume of material to be stockpiled is about 1.24 acre-feet (2,000 bcy) and the stockpile will
reach a height up to 10 feet. The salvaged soil should have good characteristics. It will be
imperfectly mixed, but the soil characteristics are shown below:
Characteristic Avera¢e Ran e
Texture Scl-SI SI-L
Electrical Cond. 0.6 mmhos/cm 0.5 to 0.9 mmhos/cm
SAR 1.0 0.2 to 1.3
pH 7.0 6.3 to 8.0
Organic Matter 0.6% 0.2-0.9%
Gravels <10% 0-40%
Water Availability 0.8in/in 0.5-1.0 in/in
Permeability mod. rapid mod. rapid to rapid
During storage the topsoil stockpile will be stabilized with a perennial vegetation cover of 5
Ib/ac Western Wheat grass - Arriba, 5 Ib/ac Streambank Wheat grass- Sodar, and 5 Ib/ac
Thickspike Wheat grass - Critana. Weed cover will be controlled via the most appropriate
i technique. This will decrease problems with weed competition during final reclamation.
M~ Volume 1 4-29.96