2014-06-24_REVISION - C1996083 (2)

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Susan Burgmaier -2- June 17, 2014 2.' DRMS: The Division received comments from History Colorado, which were forwarded to you on April 22, 2014. History Colorado stated that the proposed expansion of Pond D and subsequent demolition of the King Mine Coal Sales building would have an adverse effect on the National Register - eligible King Mine site. BRL has indicated that a mitigation plan was approved in November of 1995, with the documentation provided in Volume VI of the currently approved permit application package. The Division is currently working with History Colorado to determine whether any additional action or information will be required from BRL, and will notify you as soon as any determination has been made. We have since discussed the proposal further with History Colorado. As a result of those discussions, the Division will require BRL to complete Form 1403 and forward the completed form to Joseph Saldibar at History Colorado (address below): Along with the form, BRL should include an explanation that the proposed activities are not a federal undertaking by referencing the State Permit (C- 1996 -083). It should be noted that the proposed activities are a revision to state issued Permit No. C- 1996 -083. Please copy the Division on this submittal. RL Grand River Institute will complete Form 1403 and it will be submitted as soon as it is complete. 3. DRMS: BRL provided an abridged version, for review purposes only, of the revised design information (SEDCAD output) for the Pond D watershed and indicated that the complete design information would be submitted in a forthcoming revision that would include plans to expand Gob Pile #2. The Division did not have access to and thus did not review the entire Pond D watershed. Accordingly, when the remainder of the watershed design is reviewed, there may be subsequent required changes to the portion of the Pond D watershed design that was provided for our review. BRL: Comment noted. 4. DRMS: The as -built design for the pond (currently Drawing 95266 -04 of Volume IV, or a new Pond D Detail drawing labeled 22 -D), will need to be provided when the construction is complete. A revised as -built drawing or, if the reconstruction is not complete, a revised drawing of the proposed pond details will also be needed to review the upcoming revision for the entire Pond D watershed. BRL: Comment noted. 5. DRMS: BRL proposes the removal of Culvert C -F4 which will result in flow from Ditch D- F21-2, that previously passed through Culvert C -F4 and over to Pond F, now being directed to Ditch D -D3, Culvert C -G3, and Pond D. BRL did not provide updated Structure Details for Ditch D -D3 or Culvert C -G3 to include the additional flow that would enter Ditch D -D3 and Culvert C -G3. Without revised designs for Ditch D -D3 and Culvert