2013-08-27_REVISION - C1981022 - Laserfiche WebLink

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8/28/13 State.co.us Eecutive Branch Mail - Re: Elk CreekSEDCAD reuiewC1981022 RN 6 Burgmaier - DNR, Susan <susan.burgmaier @state.co.us> Wed, Aug 28, 2013 at 11:28 AM To: "Bowles - DNR, Brock" <brock.bowles @state.co.us> Cc: Sandy Brown - DNR <sandy.brown @state.co.us >, Alysha Hernandez - DNR <alysha.hernandez @state.co.us> Brock - I have one adequacy comment for this renewal response: Section 6 of Exhibit 2.05 -E3 includes a Pond D Summary that lists the details of the currently approved Pond D configuration. The primary spillway invert elevation on this table is reported to be 6166.0'. The previously approved SEDCAD demonstration for Pond D (Exhibit 2.05 -E3 Section 10y) also specified a primary spillway elevation of 6166.0'. The SEDCAD run provided by Oxbowwith the RN -6 adequacy response indicates that the spillway elevation is 6167.5'. The riser height in the currently approved run is 5.0'; the RN6 submittal is 5.2. Likewise, the previous version indicates a secondary spillway elevation of 6168.1' and the RN6 submittal is based on an elevation of 6169.5'. Please verify the spillway elevations and riser height and revise the RN -6 SEDCAD runs or the Pond D Summary for consistency. On Tue, Aug 27, 2013 at 2:36 PM, Bowles - DNR, Brock <brock.bowles @state.co.us> wrote: Susan, Elk Creek submitted a SEDCAD for Pond D. They are demonstrating that Pond D is adequate to handle the runoff of the undisturbed area collected in Ditch D6. Please review this SEDCAD and let me know if yo have any further questions. I will be sending out a second adequacy review on Monday of next week. Thanks, Brock Bowles Environmental Protection Specialist Colorado Division of Reclamation, Mining and Safety 1313 Sherman Street, Room 215 Denver, CO 80203 303 - 866 -3567 ext. 8142 https: / /mail.g oog le.conVmai I /u /0 / ?ui =2 &i k= e29129fcb5 &view = pt &search =i nboy&th= l4Oc5f8a4ffdf6e6 1/2