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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 will the potential for erosion. For seeding the stockpiles, Luna pubescent wheatgrass and/or Amur interrnediate wheatgrass are recommended, both of which will establish readily and quickly. This temporary seeding should be done at a rate of 15 total pounds PLS per acre. The application states that topsoil removed from the site will be treated with along-term residual pre-emergent or post-emergent herbicide to reduce noxious weeds. The grasses recommended for temporary re-vegetation of the topsoil and overburden stockpiles may be negatively affected by certain herbicides; instructions on the herbicide label should be closely followed to avoid problems. It is highly recommended that the applicant coordinate weed treatment plan development and implementation with Kelly Uhing, Adams County Cooperative Extension (303- 637-8100), to ensure compliance with the Colorado Noxious Weed Act. Reclamation Re-Vegetation The applicant proposes placement of 6" topsoil over all reclaimed areas. It is recommended that this be increased to 12" topsoil 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 re-establish normal levels of microbial activity in the soil, compost at the rate of one cubic yard per 1000 ft2 should be mixed with the soil. If compost is not applied, after topsoil replacement and before grass seeding, the soil should be tested to determine the need for additional fertilizer. Recommended grass seeding dates are from November 1 s` through Apri130°i; seeding should be done in unfrozen soil. A good quality grass seed drill 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 soil types found in the mine area for upland and disturbed areas. It is based on NRCS "critical area" seeding rates that are double our normal rates. Upland and Disturbed Areas 100% % in Mix Total LBS of Common Name PLS/Acre PLS needed er acre Western wheat rass Arriba, 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 (Lodorm) 10.0 15 1.5 Blue rama Hachita, Lovin ton 3.0 10 0.3 Sideoats rams Vau hn, Butte 9.0 10 1.0 Total 100% 11.3 Note: If seed is broadcast, recommended rate should be doubled.