REV92244

• Permit No: C1981019
• IBM Index Class Name: Revision
• Doc Date: 4/11/2007
• Doc Name: Review Memo of Adequacy Submittal
• From: Dan Mathews
• To: Jim Stark
• Type & Sequence: PR2
• Media Type: D
• Archive: No

STATE OF COLORADO
DIVISION OF RECLAMATION, MINING AND SAFETY
Department of Natural Resources
1313 Sherman S[., Room 215
Denver, Colorado 80203
Phone: [phone]
FAX: [phone]
COLORADO
DIVISION OF
RECLAMATION
MINING
&-
SAFETY
Bill Ritter, lr.
Governor
INTEROFFICE MEMORANDUM Harris D. Sherman
Executive Director
Ronald W. Cattany
Division Director
Natural Resource Trustee
DATE: April 11, 2007
TO: Jim Stark
FROM: Dan Mathews
RE: Review of Adequacy Submittal, PR-02 Colowyo Mine (Permit No. C-81-019)
Below are my itemized review comments pursuant to Colowyo's responses
to our 3/23/07 adequacy letter for PR-02. Faron Compton of Walsh Associates delivered a
packet to me on April 2, which included "Comment Response Submittal, PR-02 Second
Adequacy Letter", and various amended text sections, tables, figures, exhibits, and maps. The
response letter was dated Apri12, 2007. Additional soils data and tables were delivered to me on
the afternoon of Apri15. Comments here are limited to those review items that originated with
my review memo of March 12, 2007. I did not reiterate the full adequacy comments or
Colowyo's full responses here, I just provided my review comment based on the operator
response and associated amended materials. I tried to write the comments so that they can be
directly inserted into an adequacy letter.
Let me know if you have any questions. Note that there are Excel spreadsheet "Topsoil Block"
tables associated with Comment No. 17 that should be attached to this memorandum, and to the
adequacy letter that you prepare.
Rule 2.04.6 Geology Description
10. Operator's response indicates that Table 2.04.6-2 will be retained within the PR-2
application, as requested, and references text changes in Section 2.05.3(1) of the revision
application, and amended page 2.05-8 of the current permit package Volume 1.
Amendments to page 2.05-8 of the current permit package Volume 1 reduce the list of
overburden monitoring parameters from 6 parameters down to 3 parameters (pH,
electrical conductivity, and sodium adsorption ratio). A partial explanation and
justification for this change is provided on amended pages R2-92 through R2-94 of the
Office of Office of
Mined Land Reclamation Denver Grand Junction Durango Active and Inactive Mines