REV14611

• Permit No: C1981023
• IBM Index Class Name: Revision
• Doc Date: 8/22/1994
• Doc Name: PARTIAL PHASE II BOND RELEASE CHIMNEY ROCK MINE C-81-023
• From: DMG
• To: HARRY RANNEY
• Type & Sequence: SL2
• Media Type: D
• Archive: No

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STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY
Depanmeni of Natural Resources ~~~~
1313 Sherman 51.. Room 215
Denver, Colorado A0203
Phone: [phone]
FAX: [phone]
DEPARTMENT OF
NATURAL
Date: August 22, 1994 RESOURCES
Roy Romer
To: Harry Ranney ,%/' co~emor
/J~.{;; Ken Salazar
From: Kent Gorha ~`(\~\N Execwive Director
Michael B Long
CC: David Berry Division Director
RE: Partial Phase II Bond Release, Chimney Rock Mine, #C-81-023
I have completed review of the July 1994 responses to my adequacy
review dated February 15, 1994 for the Phase II Bond Release for
the Chimney Rock Mine.
There was not a map submitted for use during my review. I can only
assume that the acreage changes which will result from the proposed
field modifications have been correctly portrayed. other issues
identified in my original adequacy review have been satisfactorily
addressed.
Most areas proposed for Phase II release have been demonstrated to
contribute less sediment given the modelling assumptions used. The
exception is the AVF area which produces a very small amount of
sediment (< 1 ton). I will leave the final call on whether this
area can be released to you and your senior.
One big reason this modelling successfully demonstrated less
contribution of sediment in the reclaimed state is due to the
extremely poor condition of the reference area. It is important
that the cover data of the reference area is valid and
representative of field conditions. Your team vegetation expert
can easily verify this.
Also, given the erosion which has occurred recently at the site and
the changes that are proposed to be made, it is very important that
we continue to closely monitor and inspect the site for signs of
excessive erosion. Proposed changes, if properly done, should
increase the landscape stability and improve vegetative cover.
I would recommend Phase II release once proposed field changes are
completed and the operator has complied with all permit commitments
with regard to drainage control.
If you have questions let me know.