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II," dated January, 1995). A series of pumps can be employed, as needed, to <br />evacuate the accumulated runoff water in Sediment Pond 2 back to the Dugout <br />Pond, within a maximum time frame of 72 hours, thus meeting a reasonable <br />evacuation time period for Sediment Pond 2 dewatering. In this manner, CEC can <br />maintain a continued lowered pond level in Sediment Pond 2 during prolonged <br />periods of excess rainfall and runoff at the site (similar to that experienced during <br />the spring of 1995). CEC has had one occasion to follow this plan, during rainfall <br />events in late April and early May 1999. The system functioned as designed. <br />Except for the surface water accumulation from a "recent" rainfall event, the <br />practice of encouraging standing water to "pond" in the former mining pits (now <br />confined to the ash disposal B-Pit) has been eliminated. Deep eolian sand deposits <br />(some as much as thirty feet thick) exist across the remainder of the mine site. The <br />sand's high infiltration characteristic contributes to a significant loss of surface <br />moisture, due to the "deep percolation" of rainfall during most storm events. The <br />result is that normally only minimal runoff is experienced. As additional portions <br />of the Permit site are reclaimed (topsanded and seeded), less and less runoff has <br />been observed. <br />0 <br /> <br />AHR-2008 -42-