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• monitored along with inflows, use and outflows. This information is recorded and <br />compiled to develop a water balance and consumptive use report which is included <br />in the Annual Mine Hydrology Report submitted to the CMLRD. <br />Sedimentation Ponds Nos. 1, 4, and 5 at the Southfield Mine have been designed <br />to retain the runoff from a 10-year, 24-hour event and include separate principal <br />and emergency spillways to safely pass the peak discharge resulting from the 25- <br />year, 24-hour design storm event. The configuration and construction of Ponds 1, <br />4, and 5 are graphically illustrated by the Sedimentation Ponds 1, 4, and 5 Design <br />Maps, (Maps 21, 23 and 24 respectively). <br />Sedimentation Pond No. 1 is designed to retain runoff from coal stockpile and <br />associated mine yard areas. Runoff from the northern and eastern portions of <br />these areas sheet-flows to adrop-structure located at the west end of the pond. <br />Runoff from the western portions similarly sheet-flows to a mine yard collection <br />basin, and is transferred through an 18" CMP to the pond. After retention to allow <br />settlement of suspended solids, Sedimentation Pond No. 1 discharges to the <br />• Magpie Creek Diversion at NPDES discharge point 001. <br />Sedimentation Pond No. 4 is designed to retain runoff from the coal refuse pile <br />area. Surface runoff from the refuse pile is collected and routed to Pond 4 by the <br />North, West, and South Refuse Collection Ditches. The pond also receives <br />groundwater drainage from the refuse pile which is intercepted by rock sub-drains <br />and routed to the north and south collection ditches. Pond 4 discharges to minor <br />tributary of Newlin Creek through NPDES discharge point 002. <br /> <br />2.05.3-46 Revised 4/10/96 <br />Minor Revision No. 30 <br />