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Results: <br />The 25 -year 24 -hour storm event of 2.2" was used for all run -off calculations. <br />Peak flows were calculated using SedCad 4.0. <br />The calculated peak flow to Pond 9 resulting from the 25 -year 24 -hour storm <br />event is 0.34 or 153 gpm. Adding the 30 gpm mine water flow brings the total <br />flow in the spillway to 183 gpm or 0.41 cfs. <br />Designs are provided for the Pond 9 trapezoidal channel emergency spillway and <br />the ditch to the refuse pile. The Pond 9 trapezoidal channel transitions into the <br />refuse pile ditch so flow from Pond 9 is directed to the refuse pond. The Pond 9 <br />trapezoidal emergency spillway channel is earth -lined and designed to carry <br />short-term infrequent flows at non- erosive velocities. Sustained flows are not <br />expected. See Drawing D -2 -5 for details. <br />The water in pond 9 and the refuse pile pond are used by the landowners. The <br />landowners are adamant in their position that they do not want to waste the water <br />flowing through the treatment ponds. The landowners want the water stored in <br />the ponds so it can be used by livestock and wildlife. <br />ENGINEERS CERTIFICATION <br />The SedCad calculations and information presented on pages P -9 -12 through P- <br />9-20 were prepared by me during the moilttfigf May 2014 and the information is <br />true and correct to the best of �k11 ©wtedg'?belief. <br />Ca <br />o <br />•ov, <br />James E. Stov, 0 Date <br />°c <br />o�SS1 0 k; ;fie <br />•�47 � � <br />TR -28 P -9 -13 05/14 <br />