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<br />pond construction. <br />e) No table depicting design data was located. <br />f) The emergency spillway crest elevation is in error on EX15-14 for the coal <br />loadout. (633 ] should be 6631). <br />Fill 2 <br />g) The dewatering time for this pond is 125 days. If pond 2 was to fill with water <br />from a 10 year storm event, how would water be removed from storage within a <br />reasonable time to allow for proper treatment of subsequent storm events? <br />Fill 3 <br />h) The crest and emergency spillway values differ between EX 15-14 and the design <br />information. <br />i) The detention time for this pond appeazs too short as 1500 tons of sediment leave <br />this structure from the 10-year design storm event. This equates to 26.8 tons/acre <br />based on the 56 acres in the watershed. While the predicted settleable <br />concentration appears to meet the effluent limitations, this amount of sediment <br />seems excessively high. Please re-evaluate to reduce the sediment exiting the <br />structure if possible. <br />Fill 5 <br />j) This pond also should be re-evaluated, as 13.9 tons/acre of sediment leave this <br />structure. <br />k) Fill 5 required sediment storage elevation on figure EXIS-14 reads 68e6.68. <br />Please correct. <br />Fill 8 <br />l) Design information for Fill 8 pond was not included in Exhibit IS materials. <br />150. This information will be submitted. At this time, this response is inadequate. <br />151. This information will be submitted. At this time, [his response is inadequate. <br />152. The Exhibit 15 table of contents, page i, should identify figure EX 15-15b, not EX 15-56. <br />164. Culvert and ditch calculations were reviewed. Discrepancies which remain are as follows: <br />