2011-09-09_REVISION - M1981185 (43)

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Mr. Wallace H. Erickson Response to August 22, 2011 Cazier Memorandum September 9, 2011 Page 7 schedule is tied to the date site access might be granted and seasonal limitations related to field and construction work. Response to Adequacy Issue No. 9. Wildcat will modify the fifth solid bullet of the Reporting section at Page 6 of Attachment D -3 as follows: "'As built' drawings will be prepared and submitted where center lines, cuts and fills have been established 45 days after the work performed pursuant to the Little Deadwood Gulch May Day No. 2 Drainage Control Work Plan has been completed." Adequacy Issue No. 10. Figure D -1, Stormwater Control Plan: a. The ditch profile does not show cover over the culvert(s), nor does it indicate there are two culverts. b. The plan view indicates two 24 -inch CMPs are required. Is it one or two? c. The typical ditch section A -A shows a 2 -foot bottom width. The FlowMaster® output after Table U -6 (Attachment U -3) uses a 4 -foot bottom width. Which is it? d. The placement of the rock check dam immediately downstream of the culvert(s) should be placed far enough downstream such that it does not create a tailwater condition for which the culvert(s) are not designed leading to overtopping flows. Response to Adequacy Issue No. 10. Response to Adequacy Issue No. 10.a. Wildcat is submitting a revised Exhibit D, Attachment D -3, Figure D -1, Stormwater Control Plan, modifying the ditch profile to show cover over the culverts and to indicate two culverts will be installed. See Attachment 3. Response to Adequacy Issue No. 10.b. See supra Response to Adequacy Issue No. 10.a. Response to Adequacy Issue No. 10.c. The typical channel width bottom will be 4 feet as presented in Exhibit U (Environmental Protection Plan), Attachment U -3 (Stormwater Management Plan), DEN 97,591,786v1 9 -9 -11 GREENBERG TRAURIG, LLP • ATTORNEYS AT LAW • WWW.GTLAW.COM