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E-20 <br />• E.7.1 Surface Waster <br />During the construction phase, surface disturbance including <br />cuts, fills, and grading could increase the potential for <br />sedimentation in nearby streams. Presently, no perennial streams <br />occur within the mine area. Streams which drain the mine area <br />are intermittent and usually have less than 2 square miles of <br />drainage area above the project site. Sedimentation pond and <br />runoff diversion ditches will be placed at strategic locations to <br />minimize runoff and sediment contributions from construction <br />areas. <br />Each production/injection well will have a retention pond during <br />• drilling to contain all drill cutting liquids. Saline <br />cutting/liquids greater than 5,000 umhos/cm will be removed and <br />placed in process ponds near plant site. <br />The proposed mine plan requires two ponds (evaporation/process) <br />for use in the nalicolite extraction process. These ponds are <br />approximately 10 acres in size with a dual liner system that <br />incorporates a drain blanket and leakage detection system. Any <br />water which breaches the top liner would flow by gravity between <br />the liners to a leakage collection ditch and sump. Leak <br />detection equipment in the collection sump will signal that a <br />breech of the liner has occurred. Remedial action will then take <br />place. Provisions will be made to allow one pond to be drained <br />• to the other so that repairs can be conducted. <br />