2021-09-07_REVISION - M1973021 (4)

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Aggregate Industries, Morrison Quarry Amendment No.7 to Permit M-1973-021 FYZ Morrison,CO • Fuel Storage Area • Haul Roads and Parking Areas • Truck Wash and Tarping Area on Main Access Road • Dewatering Wells, Communication Towers, and Other Utilities Areas where these structures are constructed will be cleared of debris following dismantling. Debris will be sent to a licensed landfill facility for disposal. Each area will then be graded to surrounding topography and revegetated according to the requirements of the section titled Revegetation. Exhibit L—Reclamation Costs provides costs for dismantling and demolishing structures, including a $425,000 offset assumed for the sale of processing equipment post- mining. Revegetation Revegetation will be performed approximately on a yearly basis, preferably in late fall (November), for any area that has been backfilled, graded, and shaped. Typical acreage having undergone hydroseeding in a given year is between 1 and 5 acres, based on work completed to-date. This may include acreage that has previously been seeded, but which has required overseeding for continued maintenance. . Seeding with 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. Specific application rates for the fertilizer, seed, mulch, and shrub/tree planting frequencies can be found in the section titled Planned Reclamation Scope of Work, Item 11 below. Upon sustained, regenerative native grass establishment, shrubs and trees 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 are those that have been previously discussed in permit amendments, and that are currently providing successful reclamation in the North Quarry. Timed irrigation using "spaghetti tubing"with emitters has been practiced with success on tree and shrub plantings in the older parts of the North Quarry. This practice may be utilized for a maximum of 3 years to "wean" the plants to the natural meteorological cycle. Additionally, the operator has recently been experimenting with individual plantings designed to capture and retain natural moisture in the reclaimed portions of the Central Quarry with apparently good success. Irrigation practices will be at the discretion of the operator, but with the goal of an approximately 70% survival rate of trees and shrubs. The end-result of successful reclamation will provide wildlife habitat surrounding the reservoir(s) that mimics, as closely as possible, the pre-existing vegetative cover using sustained revegetation. Upon final soil preparation at the former plant site, haul roads, and other un-mined areas, these areas will also be hydroseeded with the approved seed mixture and manually planted with trees and shrubs. To achieve a natural, pre-mining density of shrubs and trees, they will be replaced where and when necessary. Shrubs and trees (detailed in Exhibit F.3, Table 2) will be planted where they would be naturally found in this area. For example, Douglas September 2021 1 31