REV103224

• Permit No: M1980244
• IBM Index Class Name: Revision
• Doc Date: 4/9/1999
• Doc Name: REVIEW OF TR28 CRESSON PROJECT M-80-244
• From: DMG
• To: BERHAN KEFFELEW
• Type & Sequence: TR28
• Media Type: D
• Archive: No

STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY
Depanmenl of Nalu ral Rewurces
131 3 Sherman SL, Room 115
Dem~er, Colorado 80203 D I v 15 1 0 N O F
Rnnne:lso31e~,6-sse~ MINERAL S
FAX. [phone]fi &
GEOLOGY
R E C L A M A T I O N
MI NING•SAFETY
April 9, 1999
Fill O..ens
Governor
To: Berhan Keffelew e,eF E. ~ti-alcner
E ~ecwive Dveclo~
From: James Dillie Micnael e. Eonti
Divi~iun Dueaur
Re: Review of Technical Revision No. 28, Cresson Project, M-80-244
I completed a technical review of CC&VG's latest TR submittal which involves a revision of the
toe berm (increasing the height by 2 feet) and a modification of the coarse shaft backfill and fine
shaft backfill gradation specifications.
Both of these items were discussed at the March 5, 1999 meeting with CC&VG where it was
decided that the revisions were minor but significant enough to require a technical revision
submittal to address [he revisions.
CC&VG proposes to increase the height of the toe berm to approximately 9,312 feet above mean
sea level instead of 9,310 feet above mean sea level as approved in the recent Amendment No. 7
application. The increased height will reduce [he width of the toe berm crest [0 12 feet. The
operator is required to comply with all other approved specifications related to the construction
of the toe berm raise (compaction, soil liner fill, applicable geomembrane specifications, etc.).
If the operator rips, tears or punctures the existing liner system during excavation operations, the
operator shall commit [o repairing the geomembrane with certified liner material and shall
comply with the approved welding, etc., specifications.
As required, the operator submitted a replacement drawing to show the additional two feet of
height proposed for the Phase II toe berm. This will replace drawing number 9 in Volume II of
the Amendment No. 7 application. Also included in this TR application are two replacement
pages for Volume III, Appendix I of Amendment No. 7 which reflects the minor revisions of the
coarse shaft backfill and fine shaft backfill gradation specifications.
I recommend approving TR-28 as submitted with one stipulation, as noted above.
cc: James Stevens, James Pendleton