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<br />C~ <br />As shown in Appendix O-2R3 E 4, Modification No. 2 of the permit <br />ap~•lication and the Panorama Resource Services report of Rugust 1, 1984 <br />the Sedimentation Pond B was constructed to contain in excess of a 10 <br />year-24 hour event. Also the sp it luay was dls igned to pass safely the <br />25 year-24 hour event. <br />The amount the 12 inch gated spillway on the Rienau No. 2 Sedimentatir~. <br />Pond S must be opened to allow for automatic deuatering with an averz~~. <br />retention period of 24 hours is 3.0 inches CSee attached calculation<_). <br />] hereby certify that these calculations and statements are correct <br />within the confines of the accuracy of the data provided by Northern <br />Coal Company. <br />Troy Wills, P.E. <br />,_ f <br />/ice ~'. `. ~ ~. <br />~i' <br />^ate • 3 ~ >' S <br />...~Va uyrgq,., <br />~; .>~ a P. <br />is YF• ~ ~ y. <br />_ /; r ~ T_ <br />"'•.n..un~ud~~ <br />U <br />