2011-09-09_REVISION - M1981185 ‎(43)‎

• Permit No: M1981185
• IBM Index Class Name: REVISION
• Doc Date: 9/9/2011
• Doc Name: Response to Fifth Adequacy Letter
• From: R Squared, Inc.
• To: DRMS
• Type & Sequence: CN1
• Media Type: D
• Archive: No

Mr. Wallace H. Erickson
Response to August 19, 2011 Cazier Memorandum
September 9, 2011
Page 4
Adequacy Issue No. 6.
Page 8, Augmentation Pond, second to last paragraph. The last line of this paragraph
references the work plan, Attachment D -5, Figure D -5 -1 for illustration of the
embankment slopes. Attachment D -5 is the Dry Stack Tailings Work Plan, Attachment
D -6 is the Augmentation Pond work plan. Furthermore, it is Figure D -2 in Attachment
D -6, not Figure D -1 that presents sections of the Augmentation Pond. Finally, there are
no embankment side slopes labeled in cross section A, and the downstream embankment
is cut off in the cross section. There is no horizontal scale provided from which to
estimate a side slope on the cross section.
Response to Adequacy Issue No. 6.
Wildcat will correct the reference in the last line of the second to last paragraph
on Page 8 of Exhibit 6.5 to refer to Attachment D -6, Figure D -2. Wildcat is also
providing a corrected Attachment D -6, Figure D -2 labeling side slopes in cross section
A. See Attachment 3. There is no embankment. This is an incised pond. The
downgradient topography is natural.
Adequacy Issue No. 7.
Page 9, La Plata River Bridge. The first bullet references Attachment 6.5 -3 with respect
to the bridge. The "Geotechnical reconnaissance report" in Attachment 6.5 -3 does not
mention the bridge.
Response to Adequacy Issue No. 7.
Wildcat will clarify its approach to demonstrating the stability of the La Plata
River Bridge, and any necessary upgrades to the bridge to achieve stability, by
modifying the bullets at Page 9 of Exhibit 6.5 under the La Plata River Bridge section as
follows:
• Based upon preliminary analysis, the La Plata River Bridge is currently
designed to support an AASHTO truck loading of 15 tons. (Attachment
6.5.6).
• The bridge is currently 36 feet long, 11 feet wide with four 12 "x12" beams.
(Attachment 6.5.6). The bridge supports are approximately 33 feet on center.
(Attachment 6.5.6). The bridge is capable of supporting an AASHTO truck
loading type H15 -44 which is 6,000 pounds on the front axle and 24,000
pounds on the rear axle spaced 14 feet on center. (Attachment 6.5.6).
• In order to confirm the stability of the La Plata River Bridge in its current
configuration, and to assess the need for any improvements to further
DEN 97,591,785v2 9 -9 -11
GREENBERG TRAURIG, LLP • ATTORNEYS AT LAW • WWW.GTLAW.COM