2009-03-30_REVISION - C1982056

• Permit No: C1982056
• IBM Index Class Name: REVISION
• Doc Date: 3/30/2009
• Doc Name: Adequacy Review Memo
• From: Kent Gorham
• To: Janet Binns
• Type & Sequence: TR66
• Email Name: JHB
• Media Type: D
• Archive: No

STATE OF COLORADO
DIVISION OF RECLAMATION, MINING AND SAFETY
Department of Natural Resources
1313 Sherman St., Room 215
Denver, Colorado 80203
Phone: [phone]
FAX: [phone]
Interoffice Memo
COLORADO
D I V I S ION OF
RECLAMATION
MINING
SAFETY
To: Janet Binns
From: Kent Gorham
CC: Dan Hernandez
Date: March 30, 2009
RE: Adequacy review comments, TR-66, Foidel Creek Mine
Bill Ritter, Jr.
Governor
Harris D. Sherman
Executive Director
Ronald W. Cattany
Division Director
Natural Resource Trustee
Janet, as per your email request dated March 27, 2009 1 have completed my adequacy
review for Technical Revision No. 66 (TR-66) for the Foidel Creek Mine, #C-82-056. I added
one question (multi-part, albeit) to your adequacy letter and forwarded it to the applicant.
The applicant has provided adequate information to comply with Rule 2.05.3(4) for Ponds,
impoundments, other treatment facilities, and diversions, and the associated performance
standards of Rules 4.05.6 and 4.05.9. I'll leave it to you to check Exhibit 25Y to ensure that
the applicant has demonstrated a safety factor of 1.3 can be achieved for the sediment ponds
(Rule 4.05.9(8)(b).
One question that is really more of a clarification is related to topsoil removal timing of the
disturbed area. One page 2.05-45.6h the applicant states "Following soil removal, required
drainage and sediment control structures will be constructed or installed". Based on the
sequence of events provided on page 2.05-45.6g, I assume they mean topsoil removal for
the sediment ponds disturbed area as opposed to the ventilation pad disturbed area and
additional upstream areas. The sediment ponds and associated sediment control measures
are required to be constructed and in-place prior to any other watershed disturbance
activities. This includes construction and as-built certification. Once ponds and other
measures are in-place, and certified as constructed as designed, the remaining facilities can
be constructed, beginning with topsoil removal of those additional areas.
Let me know if you have any other questions.
Office of Office of
Mined Land Reclamation Denver • Grand Junction • Durango Active and Inactive Mines