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Within the disturbance areas, surface water exists only as ephemeral flows in <br />the usually dry tributary drainage ways to the Colorado River. Runoff from local <br />precipitation will be collected in sedimentation ponds. Water from <br />sedimentation ponds will be settled before being discharged to the natural <br />drainage system except during unusually high precipitation events (e.g. greater <br />than a 10-year, 24-hour storm). When discharge from the sedimentation ponds <br />is necessary, the water will be released in accordance with the NPDES permit. <br />Only minor disturbances associated with exploration have or are expected to <br />occur within the Cottonwood and Rapid Creek drainage areas. Therefore, <br />these creeks are not expected to be affected by mining operations. <br />No beneficial use of groundwater has been identified in this permit area and <br />only minor beneficial use has been identified in the adjacent area; therefore, <br />mining operations will not interrupt any present use of groundwater. <br /> <br />(4) The locations of all applicable surface water hydrology features in the Roadside <br />North and South Portals permit area and adjacent areas are shown in Exhibit <br />17, Tab Section 7. <br />• 7-16 (New 3/1/96) <br />