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• of an erosion channel down the slope. At the outlet of the inter- <br />cepting pipe, and energy dissipating basin will be constructed. <br />Two storm water retention ponds have also been provided as shown <br />on Figure G-5. The ponds are capable of containing surface runoff <br />on a portion of the area above the ponds. The time delay afforded <br />by the ponds will result in the dual benefit of decreasing the <br />momentary peak flow into Davis Gulch, and tend to settle out any <br />transported material before moving into Davis Gulch. Depending <br />on additional material testing of the processed shale, these ponds <br />may be lined to prevent potential infiltration into the disposal <br />pile. It is currently anticipated that these ponds will be built <br />of highly compacted processed shale, and that lining will not be <br />necessary. <br />Davis dam <br />• The Davis Gulch Dam will serve as a major catchment area for all <br />water from the Davis Gulch watershed which may be contaminated <br />as a result of plant operations, processed shale disposal, or <br />coarse ore storage. This facility will be designed to contain <br />a minimum of a ten year runoff event. A safety spillway will <br />be available to pass the PMF. As noted in other sections of <br />this application, the Davis Dam is designed to control and miti- <br />gate any potential adverse water quality impacts produced as a <br />result of activity upstream from the dam. Thus, this dam is an <br />integral part of the water pollution control system for the over- <br />all complex. Additional design information about Davis Dam can <br />be found in Exhibit D. <br />Sewage treatment <br />The sewage treatment system at the plant site will collect sewage <br />from all maintenance, operations, laboratory, safety and security <br />. facilities. Effluent from the sewer will be treated in a secondary <br />G-41 <br />