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2011-09-30_REVISION - M1981185
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2011-09-30_REVISION - M1981185
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Last modified
6/15/2021 5:58:22 PM
Creation date
10/4/2011 1:25:31 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1981185
IBM Index Class Name
REVISION
Doc Date
9/30/2011
Doc Name
Sixth adequacy letter (CN-01)
From
DRMS
To
R Squared Incorporated
Type & Sequence
CN1
Email Name
WHE
Media Type
D
Archive
No
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May Day /Idaho Mine — Comments to Selected Work Plans Responses September 9, 2011, <br />Exhibit D <br />Page 3 <br />September 27, 2011 <br />process. The response to this adequacy issue presented in the subject response letter shall be <br />included in the revised Work Plan. <br />Adequacy Issue No. 10: <br />ated <br />a. This has not been corrected on the revised show drawing over over(Attachment <br />the culve, Drt Figure D-1 <br />does pr e <br />9/7/2011). The profile still does not <br />there are two culverts. Please <br />revise between ditch <br />an profile as to whether thickness <br />over o the culvert(s), provide consistency <br />two culverts are intended. <br />b. See supra Comment to Adequacy Issue No. 10a. <br />c. Based on the new drawing submittal, Attachment D -3, Figure D -1 and Table U -6 are now <br />consistent with respect to the bottom width of the proposed channel. <br />d. The applicant has committed to resolving this adequacy issue. However, they have not <br />committed to addressing this adequacy issue in a TR or AM. Please provide a written <br />commitment to resolve this work plan adequacy TR <br />or <br />in the subject respo� letter shall be <br />bulleted response to this adequacy presented <br />included in the revised Work Plan. <br />Attachment D -4, Chief Drainage and Portal Work Plan and Lamb Affected Area Little <br />Deadwood Gulch <br />Adequacy Issue No. 11: <br />a. The response is unacceptable. DRMS cannot allow mining to proceed while mine waste <br />is disturbing the prevailing hydrologic balance (pursuant to C.R.S. 34- 32- 116(g)) in Little <br />Deadwood Gulch. Regardless as to whether the applicant can demonstrate removal of the <br />existing mine waste material will destabilize the Chief Portal and adjacent bench, an <br />alternative means of stabilization shall be provided by the applicant that includes the <br />removal of the mine waste material from Little Deadwood Gulch. <br />i. DRMS will require the applicant provide a geotechnical /stability analysis <br />to demonstrate that the proposed alternative means of stabilization will in <br />fact stabilize the Chief Portal and adjacent bench with an appropriate <br />factor of safety. <br />b. The applicant states that all mine waste will be removed during reclamation. However, <br />the referenced drawing Figure F -5A, does not in fact show all the mine waste being <br />removed, even at reclamation. Future submittals shall show all the mine waste is to be <br />removed from Little Deadwood Gulch both during operations and after reclamation. <br />Attachment D -6, Augmentation Pond Work Plan <br />Adequacy Issue No. 12: The response is inadequate. The applicant's revised Attachment D -6, <br />Figure D -2 and response to Adequacy Issue No. 12 does not adequately address the August 22, <br />2011 comment and raises additional questions: <br />a. The applicant's response states wattles will be installed during construction. No wattle <br />locations are shown on the revised Attachment D -6, Figure D -2. Please provide locations <br />where these wattles will be installed. <br />b. The applicant's response states a down gradient perimeter ditch and catch basin will be <br />installed to collect and divert stormwater and snow melt. The new diversion ditch <br />c: \pegleg \my documents -2 \my documents \correspondence, minerals, 2011\nay day cnl, 6, tac, exhd, <br />27sep 11.docx <br />
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