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Exhibit D <br /> Peters 313 Site Mining Plan <br /> a) Mining Methods <br /> The area to be mined will be stripped so that the crushing and screen plants can be set <br /> up on the northwestern portion of the permitted area. It is anticipated that mining will <br /> be done using excavators, front end loaders, dozers, scrapers, and haul trucks. <br /> Weld County Road 136.5 extends east-west along the north edge of the Peters 313 site <br /> (see Exhibit C2). An access road has been constructed from Weld County Road 136.5 to <br /> the Peters 313 site. Gravel excavation and processing areas will be accessed from that <br /> road. <br /> Any trash generated will be collected in an on-site dumpster and disposed of at the <br /> County landfill. No chemicals are anticipated to be utilized at the site. <br /> b) Earth Moving <br /> Excavation and stockpiling volumes are anticipated to be approximately 100,000 tons per <br /> year. The excavation of gravel and sand reserves is estimated to take 5 years or less. <br /> Approximately 20 to 25 acres (15 acres for stockpiling and processing and 5 to 10 acres <br /> for mining) will be disturbed during the initial phase of the mining operation. <br /> MSHA approved open excavation and fall protection safety measures including fencing <br /> and berms will be installed as needed. During, and following mining, the side slopes of <br /> the pit will be graded for stability and will be re-vegetated as needed to meet the <br /> reclamation plan. <br /> There is typically less than twelve inches of topsoil at the Peters 313 site. Topsoil will be <br /> stockpiled around the perimeter of the permit area as shown on the mine plan map (see <br /> Exhibit C2). The topsoil piles will be seeded to prevent erosion and loss of soil. <br /> c) Water Diversions and Impoundments <br /> The Peters 313 property is tributary to Porter Creek which is an intermittent stream that <br /> is typically dry most months of the year. Berms will be constructed around the perimeter <br /> of the permit area to retain onsite surface water runoff. Additionally, the pit floor will be <br /> sloped back into the pit in order to minimize the amount of water running down the <br /> unmined slopes located below the mining operation. <br /> There are no irrigation structures or surface water impoundments existing or planned at <br /> the site. Water needs for gravel mining and processing operations are expected to be <br /> minimal. Water for dust control can be obtained and hauled from existing County-owned <br /> wells that have been decreed for dust control and industrial uses. Water used in mining <br />