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..., ~ ~ iii iiiiiiiiiiiiiiii STATE OF COLORADO DIVISION OF MINERALS AND GEOLOGY Deuanmem of Natural Resources 1313 Sherman St., Room 215 Denver, Colorado 80203 Phone: (3031 866-3567 FAX: (303) 832-8106 April 13, 1994 RE: Carlton Project, Permit No. M-SO-244, Amendment No. 6 Stipulations ~~ ~~~ DEPARTMENT OF NATURAL RESOURCES Rnr Bonier Guvernrn Rrn Salazar E~cun rve Dire, un Michael tl. LonF Division Direuor 1. All reclaimed slopes shall be no steeper than 2.5H:1 V unless the operator can demonstrate that the required vegetation cover can be established and maintained on steeper slopes and that gross erosion will not exceed gross soil building. Steeper slopes than 2.5H:1 V may be used only when absolutely necessary to blend reclaimed slopes in with natural slopes that are steeper than 2.5H:1 V. 2. All topsoil stockpiles shall be protected from erosion. 3. The operator shall apply topsoil at a minimum depth of six inches to all regraded surfaces, including mine benches. All areas that have topsoil applied shall be revegetated. All suitable topsoil that is four inches and greater in depth shall be salvaged unless exempted by the Office. 4. All foundations, footings, and floor slabs, if they will not be removed, shall be fractured sufficiently to allow root penetration. A minimum thickness of two feet of non-toxic, non- acid-forming overburden or waste rock shall be replaced on all facilities foundations, footings, and floor slabs if they are not removed during reclamation. A minimum of six inches of topsoil will be applied following overburden placement. 5. Reapplied topsoil and/or growth medium shall be sampled for pH, electrical conductivity, sodium adsorption ratio, nitrogen, phosphorus, potassium, major cations and anions, organic matter, and texture. One composite sample shall be taken for every five acres of replaced soils and/or growth medium. Soil amendments shall be added when test parame- ters do not meet the requirements for growing native grasses as set forth in the "Guide to Fertilizer Recommendations in Colorado." If phosphorus application is required, half shall be applied prior to soil placement and half after soil placement. All fertilizer shall be incorporated into the topsoil and subsoil. 6. Tree and shrub seedlings shall be planted on north- and east-facing slopes at an overall average rate of 200 per disturbed acre. Along with other vegetative parameters that must be met, a survival rate of 50 trees and/or shrubs per acre five years after planting will be required for permit financial warranty release. 7. All proposed affected area boundaries will be marked in the field or otherwise delineated in a manner acceptable to the Office within 30 days of amendment approval.