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IS.. 2 aze very invasive and move onto disturbed areas very quickly. Some of these can be noxious weeds and require control based on the state noxious weed list. Through immediate seeding to promote temporary cover, the opportunity for weed invasion will be less, as w$1 the patemial for erosion. For seeding the stockpiles, Lunapubescent wheatgrass and/or Amur intermediate wheatgrass are recommended, both of which wdl establish read~7y and quickly. This temporary seeding should be done at a rate of 15 total pounds 1'I.S per acre. The application states that topsofl removed from the site will be treated with along-team residual pre-emergern orpost-emergent herbicide to reduce noxious weeds. The grasses recommended for te~orary re-vegetation ofthe topsod and overburden stockp~7es may be negatively,affected by certain herbicides; instructions on the herbicide label should be closely followed to avoid problems. I4 is highly recommended that the applicant ceordinate weed treatrne~ plan development and implemernation with Kelly Uhing, Adams County Cooperative Extension (303- 637-8100), to ensure compliance with the Colorado Noxious Weed Act. Reclamation Re-Ve etati The applicant proposes placement of ti' topsoil over all reclaimed areas. It is recommended that this be increased to 12" topsod that is spread in lifts not to exceed 4 inches and worked into the slopes to ensure good adhesion and to minimize soil creep. In order to reestablish nornral levels of microbial activity in the sot7, compost at the rate of one cubic yard per 2000 tt''shouldbe mixed with the sot7. If cohost is not applied, after topsoil replacement and before. grass seedmg, the soil should be tested to determine the need for additional fertilizer. Recommended grass seeding dates are from November 1"through Apn130°i; seeding should be done in unfrozen sml A good quality grass seed dn71 with an agitator, depth bands and press wheels is recommended The following native grass seed mix and application rate is recommended for re-vegetation in the sot? types found in the mine area for upland and disturbed areas. It is based on MRCS "critical azea" seeding rates that are double our normal rates. Upland and Disturbed Areas 100°h °~ in Mlx Total L8S of Common Name PLSlAcre PLS needed er acre Western wheat rass A~rriba, Barton 16.0 30 4.8 Switch rass Blackwell 10.0 20 2.0 Bi bluestem Kaw 11.0 15 1.7 Green needle rass Lodonn 10.0 15 1.5 Blue rams Hachita, Lovin on 3.0 10 0.3 Sideoats rarr~ au hn, Butte 9.0 10 1.0 Total 100°~ 11.3 Note: If seed is broadcast, recommended rate should be doubled