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Flatirons, Inc. — Surveying & Engineering <br />TSF Water Levels <br />The ultimate water level in the TSF will have a minimum freeboard of 3.0 feet. The top of <br />the TSF embankment is at an elevation of 9723.0, so the ultimate level of the material in <br />the TSF is 9720.0. The runoff from Basin A is conveyed to the TSF, and the TSF has to <br />maintain excess capacity at least equal to the 10 -year, 24 -hour runoff volume. The volume <br />of runoff for the design storm to the TSF amounts to 11,944 cubic feet. The table below <br />indicates if the maximum elevation of material in the TSF is left 3- inches low, there will be <br />adequate capacity to store the 10 -year, 24 -hour runoff and maintain at least three feet of <br />freeboard. The complete TSF stage storage spreadsheet is in Appendix B <br />TSF Stage Storage Table <br />Elevation <br />Area at Elevation <br />(sf) <br />Volume Below Stage <br />W) <br />Comments <br />9718 <br />54,201 <br />857,855 <br />9719 <br />56,136 <br />913,024 <br />9719.75 <br />57,584 <br />955,668 <br />958,199 is max target volume <br />9720 <br />58,103 <br />970,143 <br />Table 4 <br />Union Mill 13 March 5, 2014 <br />