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• 4.9.2 StockoilinSl Topsoil stockpiles are situated on stable sites and are preferentially located on regraded ovefiurden to reduce total disturbance. They era located to promote drainage, and to avoid sources of contamination. Drainage d'Aches 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 protedive fences or other 'bertiers" placed between the siockpiles and the adivfty. All stockpiles are dearly marked as described in Sedion 3.1.f. All topsoil stockpiles are stabilized in the fall of the year they are constructed. Side slopes are established at 3H:Iv or flatter. Following seedbed preparation, an effective cover of non-noxious, quick rowing annual and/or perennial plants, will be seeded or planted during the first appropriate planting season after stockpile constNdion (fable 3.8-10). When available, a sterile short-lived perennial grass will be solely drilled at 40 pounds per acre on siockpiles that are to be disturbed within a 3-year period. If stockpile life is greater than three years, then the temporary disturbance mix (Table 3.10) 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. Add'Aional topsoil stockpiles constNdion areas, not previously identfied as a proposed krcation, and existing piles added to during the construction year, will be reportetl 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 wUl 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. Whet visually dominant stands of any combination of the following species occur, an appropriate hefiicide will be applied at its recommended rate. Common name Leafy spurge Canada Thistle Musk Thistle Plumeless Thistle Scoich Thistle Perennial Sow Thistle Russian Knapweed Spotted ICnapweed D'rffuse Knapr+eed u Scentific name Euohorbia esula Cirsium arvense Carkfuus nutans C. acanthoides Onooortfum acanthium Sonchus arvensis Centaurea recens Centaurea maculose Ceulaurea diffuse Pe-~ 4-255 f~AY 1 3 1998