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Hernandez, Alysha <br />From: Burgmaier, Susan <br />Sent: Friday, March 09, 2012 12:50 PM <br />To: Ebert, Jared <br />Cc: DRMS - Coal - Admin; Brown, Sandy <br />Subject: RE: HG Loadout; C- 1992 -081 TR -08 <br />Jared — I have completed my adequacy review of TR -08 for the H -G Loadout, and would recommend approval of the <br />revision as proposed. <br />The operator has provided a revised design for Ditch 3, since reclamation activities and railroad track removal have <br />negated the need for Culvert 18. The culvert will be replaced by a continuation of Ditch 3. The design information <br />provided for Ditch 3 included revised watershed information corresponding to the current conditions resulting from <br />recent reclamation activity. The information provided for the ditch adequately demonstrated that runoff from the 10 <br />year — 24 hour event will be safely conveyed. The operator has proposed that vegetation will ensure channel stability, <br />so it would probably be a good idea to verify that the ditch is vegetated in a reasonable amount of time. If vegetation is <br />not established and there are signs of erosion, it might be necessary to revise the design to a riprapped channel. <br />The operator noted that Culvert 18 might be reinstalled if the railroad tracks were replaced at some later date, but did <br />not review design information for the culvert based on the current reclamation configuration and predicted runoff. I <br />reviewed the design information for the culvert based on the post - reclamation runoff volume, and determined that the <br />existing design for a 24" culvert remains adequate. Should the culvert be reinstalled, the minimum diameter must be <br />24 ". <br />Please let me know if you have questions or need additional information. <br />Susan L. Burgmaier <br />Environmental Protection Specialist <br />Colorado Division of Reclamation, Mining and Safety <br />1313 Sherman Street, Room 215 <br />Denver CO 80203 <br />303 - 866 -3567 x 8111 <br />From: Ebert, Jared <br />Sent: Wednesday, March 07, 2012 4:10 PM <br />To: Burgmaier, Susan <br />Cc: Brown, Sandy; DRMS - Coal - Admin <br />Subject: HG Loadout; C- 1992 -081 TR -08 <br />Hello Mrs. Burgmaier, <br />We received TR -08 for the Hayden Gulch Loadout Permit No. C- 1992 -081. I am requesting your assistance with the <br />review of this revision. I will place a copy of the revision on your desk. <br />Thanks, <br />Jared Ebert <br />Department of Natural Resources <br />Division of Reclamation, Mining and Safety <br />1313 Sherman Street, Room 215 <br />Denver, Colorado 80203 <br />