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• - Overflow provisions will be eliminated from the reject <br /> material holding pond which is not intended to provide <br /> any discharge to downstream drainages . <br /> - Possible overflow of the upper water supply pond and <br /> the local drainages tributary to the bypass ditch <br /> itself is intended to flow around the holding pond <br /> area and enter the lower or downstream water storage <br /> pond through a sloping culvert outfall system that <br /> will provide some energy dissipation and reduce erosion <br /> to the downstream face of the holding pond dam. <br /> The erosion control ditch above and to the west of <br /> the pilot plant, lab, and shop areas will be relocated <br /> to reduce drainage at the rear of the buildings . <br /> This ditch will be deepened to at least two feet deep <br /> and rerouted to drain to the ditch system adjacent <br /> to the office trailer. <br /> The pilot plant fine grained reject material holding <br /> pond located between the two existing fresh water storage ponds <br /> and approved in the original permit, has been subdivided into <br /> two holding ponds. This division was accomplished by placing <br /> a "dam" composed of reject material across the holding pond. <br /> • Fine grained reject material from the operation of the pilot <br /> plant is placed in the upper portion of the holding pond . The <br /> material is dewatered through the divider in the pond and water <br /> is collected in the lower portion of the holding pond, which <br /> serves as a settling pond . The water is then reused in the <br /> pilot plant . Periodically, the upper holding pond is cleaned <br /> out and the reject material used as backfill for the bulk sample <br /> pits. <br /> Please refer to Appendix D for a map of the drainage <br /> plan. <br /> 6 <br />