2009-09-21_PERMIT FILE - C1981010A (41)

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• 4.9.2 Stockoilina Topsoil stockpiles are situated on stable sites and are preferentially located on regraded overburden to reduce total disturbance. They are located to promote drainage, and to avoid sources of contamination. Drainage ditches to divert runoff and prevent water erosion are placed at critical areas around stockpiles. Stockpiles immediately adjacent to other mining activities that might inadvertently be disturbed have protective fences or other "barriers" placed between the stockpiles and the activity. All stockpiles are clearly marked as described in Section 3.1.f. All topsoil stockpiles are stabilized in the fall of the year they are constructed. Side slopes are established at 3H:ly or flatter. Following seedbed preparation, an effective cover of non-noxious, quick-growing annual and/or perennial plants, will be seeded or planted during the first appropriate planting season after stockpile construction (fable 3.8-10). When available, a sterile short-lived perennial grass will be solely drilled at 40 pounds per acre on stockpiles that are to be disturbed within a 3-year period. If stockpile life is greater than three years, then the temporary disturbance mix (Table 3.8.10) will be used. By March 15 of each year, a map will be provided to the Division illustrating the proposed stockpile loca- tions for the upcoming year and the actual location of those stockpiles constructed the previous year. Appendix W will be updated to contain each years report and map. Additional topsoil stockpiles construction areas, not previously identified as a proposed location, and existing piles added to during the construction year, will be reported to the Division in each years annual report. Beginning in 1990, Trapper will provide approximate volumes for all existing topsoil stockpiles in Appendix W. . Once plants are established on stockpiles, an appropriate herbicide formulation or other weed management strategy may be used to control annual and perennial broadleaved noxious weeds. Herbicide applications will normally not be applied the first two growing seasons after seeding to avoid unnecessary applications and destruction of established drilled and volunteer native seedlings from the topsoil. Periodically, topsoil stockpiles will be checked for significant noxious weed invasion. Where visually dominant stands of any combination of the following species occur, an appropriate herbicide will be applied at its recommended rate. Common name Leafy spurge Canada Thistle Musk Thistle Plumeless Thistle Scotch Thistle Perennial Sow Thistle Russian Knapweed Spotted Knapweed Diffuse Knapneed E Scientific name Euohorbta esula Cirsium arvense Canfuus nutans C. acanthotdes Onooordum acanthium Sonchus arvensis Centaurea reoens Centaurea maculosa Ceutaurea dtffusa pp_-q 4-255 MAY 13 1998