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:~ <br />N <br />EJ~IT D <br />A summary of the project phasing is as follows: <br />Table D-1. Summary of Phase Disturbance Areas and Schedules <br /> Total <br /> Mined Area Disturbance Operation <br /> Location acres Area Len th ears <br /> Dewatering <br />Phase 1 14.62 51.18 1-2 <br /> erimeter <br />Phase 2 Pit center 28.26 51.18 1-4 <br />Section 2 - Earthmoving and Onsite Equipment <br />Overburden and topsoil will be stripped and moved by bulldozers, scrapers, front-end <br />loaders and haul trucks. This material will be stockpiled for reclaim and seeded with <br />fast-growing mix to avoid soil erosion if the piles will not be moved for more than one <br />growing season. <br />The same equipment will extract and transport sand and gravel resource. <br />A primary crusher may be located on the pit floor. A conveyor system or tandem-axle <br />trucks will transport material to the south side of the river onto an existing permit site <br />where secondary crushing, washing, screening and stockpiling (generically referred to as <br />processing) will occur. <br />Section 3 -Water Diversions and Impoundments <br />Water may be diverted from an adjacent ditch, known as the Callahan drain or the <br />existing gravel ponds for wash plant and dust control operations. This will be <br />accomphshed by simple pumping techniques and held in water trucks or tanks, using as <br />needed. Runoff and wash water will be returned to the river via the dewatering trench <br />and settling pond, if needed. <br />It is likely that most on-site water needs will be taken care of by the groundwater from <br />the dewatering trench. A substitute water plan is currently being prepared to address <br />replacement of consumptive use. This will be provided to the DMG prior to start of <br />mining activities. <br />Section 4 -Nature of Deposits and Overburden <br />The deposits of resource consist of sand, gravel and cobbles in a layer an average of 14 <br />feet wide, located on average about 4 feet below ground surface. Overburden consists of <br />topsoil, sandy silty clay, sandy silt and silty sand. Bedrock is a siltstone-claystone <br />located 17 to 21 feet below the surface. The upper''/x to 1 foot of bedrock is weathered. <br />