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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 Reve eta <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 />efforts. <br />Rule 2 Permits 2.05-38 Revision Date: 5/25/18 <br />Revision No.: RN -07 <br />