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RULE 2 PERMITS <br /> control by weed spraying crews. Both the weed spraying crew and the revegetation monitoring <br /> crews will be especially important in this regard. <br /> In addition to revegetated areas, vigilance will be maintained for other locations conducive to <br /> noxious weed populations. Such areas include: riparian areas, topsoil piles, major traffic areas, <br /> road cuts and fill slopes, ditches, pond embankments, non-use areas, etc. <br /> Weed control measures may include mowing,discing(conventional cultivation),burning,grazing, <br /> or applying an approved herbicide. Weedy annual species (such as pennycress) with a single <br /> season life cycle provide initial site stabilization and moisture conservation in newly seeded <br /> reclamation sites; as such they will not be specifically targeted for control. Historically, seedings <br /> on reclaimed sites have greatly out competed annual weed infestations within three or four growing <br /> seasons. <br /> Specific control measures will be selected by evaluating the location, growth characteristics and <br /> vulnerability of each weed. Management efforts will begin after proper planning and evaluation <br /> are performed. Proper use of chemicals applied during weed control is ensured by oversight of <br /> weed spraying activities by individual(s) certified by the State of Colorado to handle and apply <br /> herbicides. <br /> Colowyo reserves the right to change and modify the practices and materials it utilizes within the <br /> weed management program to achieve compliance with all applicable state and federal rules and <br /> regulations. Colowyo will evaluate each infestation on an individual basis in order to ensure proper <br /> methods,timing, materials and manpower are utilized for maximum effectiveness. <br /> Measures for Determining Success of Revegetation <br /> The success of revegetation will be determined as explained in subsection 4.15. <br /> Soil Testing Plan <br /> From conception to the mid-1990's, Colowyo tested for topsoil fertility. In order to assure that the <br /> reapplied topsoil will support the proposed post-mining land use of rangeland, a soil sampling <br /> program will be implemented. Soil samples were taken randomly over each retopsoiled area and <br /> were analyzed for nitrate-nitrogen, phosphorus, and potassium. Historical results indicated <br /> adequate nutrient value to support post-mining revegetation. <br /> Colowyo has demonstrated through numerous years of monitoring that topsoil fertility is not a <br /> concern at the mine;this is mainly due to the nutrient rich soil that is commonly present throughout <br /> the region. As a result, Colowyo has suspended the soil testing program requirements, until such <br /> time as Colowyo determines that the soil fertility adversely affects the reclamation and/or the post- <br /> mining land use. <br /> As needed other soil amendments will be added to the reclaimed areas to support reclamation <br /> effoi Is. <br /> Rule 2 Permits 2.05-35 Revision Date: 12/20/19 <br /> Revision No.: TR-135 <br />