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• designed to withstand the probable maximum thunderstorm, which <br />is 6.5 inches in one hour (Metcalf & Eddy, 1975). <br />The water effluent from the guard pond will be pumped to the <br />pyrolysis water makeup tank for eventual use in moisturizing <br />processed shale. The skimmed oil is sent to a slop oil tank <br />for reprocessing. Water from the sump area in the mine will <br />be collected in holding tanks and periodically trucked to the <br />process plant for processing through the oily-water separator. <br />in the mine bench area, work areas subject to oil and grease con- <br />tamination will be tied into a storm sewer system similar to that <br />servicing the process plant area. All other non-contaminated <br />drainage will be channelized for control purposes and taken <br />to sedimentation ponds, if future design studies indicate such <br />is required, and/or eventually returned to natural drainages. <br />• In the Grand Valley terminal facilities area all contaminated <br />runoff will be collected and treated prior to release into <br />the city sewer system. All other runoff will be channelized <br />and released into the city storm system or natural drainages. <br />In the area of the water intake facility, contaminated runoff <br />is not anticipated to exist. The area around the pump station <br />and settling basins will be graded to minimize erosion and <br />direct runoff to natural drainage courses. <br />Processed shale disposal area <br />The planned processed shale disposal area will have a surface <br />area of approximately 900 acres when fully developed. Surface <br />water runoff from this area will be collected and controlled <br />to mitigate erosion and pollution potential. An overall surface <br />water collection plan has been devised that coordinates the <br />C~ <br />G-36 <br />