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Mr. Timm Corner <br />Page 2 <br />August 23, 2012 <br />A320 — Please confirm the 50 -foot wide material at a 1% slope in Detail J is GCL. <br />A500 — a) Note 5: Inclusion of the tick mark (') after the 4 is confusing, in that it suggests a 4 -foot Precon <br />Impact Baffle. Please either remove the single quotation marks or use double quotation marks in order to <br />avoid confusion over the proposed size of the appurtenant structure. Also, note the proper spelling of <br />baffle. b) The current proposed location of the emergency spillway subjects the 21-1:1V slope to <br />overtopping flows and will lead to significant erosion of this slope. Please move the emergency spillway <br />to the northeast corner of the proposed sediment pond and armor the outfall to at least the contact with <br />native ground. This will lead to a somewhat flatter gradient (at the contact) as well as a more defined <br />channel to convey overtopping flows under this temporary condition. <br />Finally, the Division notes we have not received a response to the Geotechnical Preliminary Adequacy <br />Review, dated August 2, 2012. <br />If you have any questions, please feel free to contact the Division. <br />Sincerely, <br />Timothy A. Cazier, P.E. <br />Environmental Protection Specialist <br />cc: Tony Waldron, DRMS <br />Tom Kaldenbach, DRMS <br />Michael Cunningham, DRMS <br />Berhan Keffelew, DRMS <br />