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to moisturize processed shale. The structure will be about 120 <br />feet high of rolled earth/ rockfill construction. <br />The Middle Fork Dam is primarily a flood and erosion control <br />structure, although it will have maximum storage capability of <br />300 acre-feet. It will be a rolled earth/rockfill structure some <br />100-140 feet high. This structure will be designed to reduce <br />peak floods to a point at which they can be handled by downstream <br />culverts under the mine bench. It is anticipated that the dam <br />design will incorporate an uncontrolled outlet capable of passing <br />400 cfs and the runoff from a probable maximum one-hour thunder- <br />storm can be stored or passed. Since calculated maximum floods <br />may reach peak flows on the order of 9,700 cfs, this structure <br />is a necessity to protect the mine bench. The storage capacity <br />is planned to provide plant backup water supply. Water diverted <br />from the creek will be replaced with water from the river water- <br />• line. For a further discussion of the water supply system see <br />Exhibit G. <br />Both dams will be designed with an outlet structure (Figure D- <br />10). This feature is primarily a regulating measure. It may <br />be used to reduce or extend fill time of reservoir. It may be <br />used to reduce minimum pool, to accommodate anticipated run-in, <br />or to satisfy downstream needs. <br />SOLID WASTE DISPOSAL <br />Approximately 400 million tons of shale will be processed and <br />disposed of during the 20-year operation of the plant. Along <br />with the processed shale, Colony proposes to dispose of various <br />catalytic materials, carbon, small trees and brush cleared during <br />construction operations, sludge from various processes, possibly <br />coke, and sludge from processed sanitary waste at the plant site. <br />D-28 <br />