2023-09-06_PERMIT FILE - M2023032 (21)

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i. Final grading—maximum anticipated slope gradient or expected ranges thereof; The finished slopes of the reservoirs will be no steeper than 3:1 horizontal to vertical. ii. Seeding—types, mixtures, quantities and time of application; Please refer to the Reclamation Plan Map for the list of plant materials and seeds to be utilized. The operator will seed during the appropriate season to ensure adequate moisture for germination and implement weed controls to allow the grasses to successfully establish. Additional plantings may be installed once the reservoirs are full of water and the grasses are established. iii. Fertilization—types, mixtures, quantities, and time of application; Fertilizer is not anticipated to be necessary. The type and application rate of fertilizer may be determined based on a soil test at the time of final reclamation. iv. Revegetation—types of trees, shrubs, etc.; The site will be revegetated with an upland grass seed mix in areas that are above the highwater line or are graded back to native grade. v. Topsoiling—specify anticipated minimum depth or range of depths for those areas where topsoil will be replaced. Topsoil will be placed and spread on all areas disturbed by the mining above the anticipated high-water line and areas graded back to native grade. The minimum thickness shall be 6 inches above the surrounding finished grade. WEED MANAGEMENT PLAN Noxious weeds will be eradicated or managed within the Mine operations areas. Noxious weed species to be managed are defined as those plant species currently identified by the Colorado State Department of Agriculture (CDA) as noxious under the Colorado Noxious Weed Act. Management efforts will be directed to those species identified under List A or List B by the CDA. List A species are required to be eradicated, while List B species will be controlled. The noxious species are not listed here as the list of noxious species changes regularly. The Colorado State Department of Agriculture maintains a list of noxious weed species on their web site (https://www.colorado.gov/pacific/agconservation/noxious-weed-species). Noxious weeds will be controlled by any combination of cultural, mechanical, biological or chemical measures. Weed control measures will be developed specifically for the noxious weed species encountered and in conjunction with the local county weed control district and/or the Colorado State Department of Agriculture. Weed control measures will be undertaken by trained and/or licensed (if required by law) personnel. Weed management control will be initiated within two weeks of noxious weed identification at any operation, or as specified by the county weed control specialist. Where noxious weed control measures cause elimination of vegetation at a revegetated site, seeding or planting of desirable replacement vegetation will occur during the first normal planting or seeding season after weed control measures have been implemented. Martin Marietta Materials—Thunderbird Sand and Gravel—MLRB 112 Permit Application Exhibit E-6