2024-10-15_PERMIT FILE - M2024053 (4)

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EXHIBIT D MINING PLAN • 1 . General Mining Plan The property boundary has been surveyed. Map C-2 outlines the mining plan including the affected area of 957.5-acres. Sand and gravel will be extracted for use in construction materials such as crushed rock, sand, washed rock, concrete, and asphalt. There is also the possibility of incidental fill dirt production. Access to the mine will be from County Road 23 that connects the mine to Highway 287 to the north. This road connects directly to mining areas 1 and 6. Drainage crossings and crossings under the overhead utility lines will be constructed to connect to the other mining areas. The sand and gravel deposit to be mined averages 10 feet in thickness. The overlying overburden varies greatly in thickness due to the terracing present above the upland areas surrounding the drainage. Closer to the ephemeral drainage through the center of the site, overburden thins out, and ranges from 1-10 feet increasing towards the terraces. The deposit underlies 15-35 feet of overburden under the terraces. The terrace and upland areas in relation to the deposit are depicted on Map C-3. Dozers and scrapers will strip topsoil and overburden from mining areas, storing them in designated stockpiles. Any stockpile remaining for over 90 days will be seeded to prevent erosion. During pre-mine stripping, all agricultural structures will be demolished. Some overburden and topsoil may be directly placed as backfill, particularly the terrace overburden as backfill into the upland areas. Sand and gravel extraction will involve loaders, excavators, dozers, and trucks. Mined material will then be transported to the processing area, which will move around the site as mining progresses. Processing will include crushing, washing, and screening. Portable concrete and/or asphalt plants may also be present at the site. While haul trucks are currently anticipated, there is potential for replacement by a conveyor belt in the future. Sand and gravel will be mined in cells of 3-5 acres at a time within each mining area. Mining will progress from the upland areas with the least amount of overburden to the terraced areas. After each small section is mined, the overburden from that area will be used as backfill on the previously mined area. This will repeat in sections until the terraced area is mined out, with reclamation of backfilled areas occurring as mining progresses. Augmentation water will be needed for the evaporative losses from the exposed water and from the material mined out. The operator commits to exposing no more than 5 acres of water at a time. The area from the original 111 permit has already been backfilled, graded, and reclaimed. It is located in the center of the first mining area. This area will be left as is. Mining and reclamation will occur simultaneously to minimize overall disturbance. There is ample on-site topsoil and overburden for successful reclamation, transforming the site back into Limon Sand& Gravel Pit D-1 III Lewicki&Associates August 2024