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Due to the complex nature of the construction program for the <br />Colony project, the design and location of these pollution con- <br />trol facilities will be finali2ed by the "Engineering Contractor" <br />It is anticipated that all sedimentation ponds will be designed <br />to function for the minimum of a 10 year, 24 hour precipitation <br />event. Bypass drainage systems will be constructed to safely <br />control and pass runoff flows from larger events. <br />As a general guide, it is currently anticipated that temporary <br />sedimentation ponds would be constructed down drainage from <br />the process plant construction area, the Davis Dam area, the <br />Middle Fork Dam area, the mine bench construction area, and <br />a series of ponds prior to the intersection of Middle Fork <br />Parachute Creek and the Dow West south property line. <br />All fuel and lubricant storage will be designed to prevent <br />such materials from entering any water courses in the event <br />. of spills. All construction labor sanitary facilities will <br />be temporary self-contained units with no discharges to water <br />courses in the permit area. Where construction offices are <br />to be set-up, septic tanks with leach fields will be employed. <br />Such facilities will be permitted with the proper state and <br />county agencies prior to construction. <br />HYDROLOGIC PROTECTION DURING OPERATION <br />Runoff and oily water <br />The waters and chemicals collected from leaks, drain-outs, <br />flushes, washdowns, and storm runoff in the process area will <br />flow through the oily water storm sewer system to an oil-water <br />separator capable of handling up to 1,000 gpm. A surge and <br />guard pond will be provided to handle large quantities of water <br />during a period of high storm runoff. These ponds will be <br />• <br />G-35 <br />