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Aggregate Industries, Morrison Quarry Amendment No. 7 to Permit M-1973-021 Morrison, CO October 2021 | 40 regulatory approval procedures. Soil amendments will not contain pathogens or toxic materials harmful to human health or vegetation growth. Item 11.0 Revegetation It is anticipated that the revegetation area of the North, Central, and South/West Quarries covers approximately 155.4 acres. Seeding of the reclaimed areas assumes a native seed mix composed of the species and mixtures listed in Table E-2. This seed mix incorporates species that have performed well at the site to date. Assumed application rates of 48.0 lbs of pure, live seed per acre have been doubled in Exhibit L – Reclamation Costs to account for broadcast seeding. Revegetation will be performed approximately on a yearly basis, preferably in late fall (November), for any area that has been backfilled, graded, and shaped. Seeding of a native grass seed mix will be performed by the hydroseeding method. This method allows for seeding on fairly steep slopes; provides complete coverage; and combines mulch, fertilizer, tackifier, and seed together in one application. The hydromulch and soil amendments to be combined with the hydroseed mixture includes: • 1 ton/acre hydromulch; • 150 lbs/acre tackifier; and • 250 lbs/acre 18-46-0 fertilizer. A substitute for inorganic fertilizer would be to apply 500 to 1,000 lbs/acre of BIOSOL, an organic soil enhancer that has been effective at establishing vegetation in other reclaimed areas of the site. The proposed hydroseed mixture per acre is listed in Table E-2. Table E-2. Hydroseed Mix Grass Type Amount/Acrea Western Wheatgrass, Native 8.0 lbs/acre Slender Wheatgrass 7.0 lbs/acre Thickspike Wheatgrass 5.0 lbs/acre Vaughn Sideoats Grama 6.0 lbs/acre Blue Grama, Native 5.0 lbs/acre Apar Blue Flax 3.0 lbs/acre Indian Ricegrass 5.0 lbs/acre Perennial Ryegrass 2.0 lbs/acre Hard Fescue 3.0 lbs/acre Reubens Canada Bluegrass 4.0 lbs/acre Total 48.0 lbs/acre a-Amount per acre reported indicates "pure live seed" Shrubs and trees (detailed in Exhibit F.6, Table 2) will be planted where they would be naturally found in this area. For example, Douglas Fir will only be planted in the upper areas of the north- facing slopes of the reclaimed areas after final mining. Upon sustained, regenerative native grass establishment, shrubs and trees that are acclimatized to this area will be manually transplanted from local nursery stock. These will be in the form of containerized or tubeling trees and shrubs. Density of plantings and types to be used