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• <br />• <br />• <br />Exhibit D — Amendment 4 <br />Mining Plan <br />This Exhibit applies to the mining operation in Phase 7 only. Except for a six acre <br />portion to the east end of Phase 1, the existing permit with Amendments 1, 2, and 3 <br />continue to govern the mining activities in Phases 1 and 2. <br />(a) Methods of Mining <br />Initially the trees and shrubs will be removed from an annual mining area. Then the <br />overburden is removed. The dewatered sand and gravel deposit is exposed and excavated <br />with a wheeled front loader. The loader first dumps the sand and gravel into a screen <br />plant, where the excess fine material and clays are separated out. The marketable sand <br />and gravel exits the screen and a stacker conveys the material to the field conveyor. The <br />field conveyor carries the sand and gravel to the processing plant in the Phase 1 area. <br />This field conveyor, with an access road along side of it, is constructed initially with the <br />levee and drainage channel. <br />The mining will commence on the east side of Phase 7 and proceed to the west. We <br />expect that approximately 20 acres per year will be mined and Phase 7 will take two to <br />three years to complete. <br />(b) Earthmoving <br />The earthmoving functions involve several types of work to accomplish the mining. <br />Prior to any earthmoving, the trees and shrubs will be cleared and grubbed. The first 20 <br />acres of clearing will be deposited on the north side of Phase 7. When enough space is <br />created by mining the sand and gravel in the first 20 acres, the tree and shrub debris will <br />be moved into the excavation. <br />The next earthmoving function is the construction of the dewater trench. This trench will <br />be dug annually to enclose that year's mining area. Initially the trench will be <br />approximately 20 feet deep. As the groundwater drains out and the overburden is <br />removed, the trench will be deepened to the shale bedrock. <br />The dewater trench empties into a sump hole equipped with a pump. This water is <br />pumped up into the settling basin, which is dug down to shale bedrock in the southeast <br />corner of Phase 7. This basin allows the groundwater to settle out suspended solids prior <br />to draining out to the River. The basin will have an overflow weir to control the volume <br />of water released and to set the water elevation. <br />A concrete culvert under US 50 carries intermittent runoff water from a drainage basin to <br />the north. South of US 50, the runoff water flows in a small, inadequate channel, then <br />spreads out over the Phase 7 land. The runoff finally sheet flows into the River. To <br />