2008-07-04_REPORT - C1980001

• Permit No: C1980001
• IBM Index Class Name: REPORT
• Doc Date: 7/4/2008
• Doc Name: 2007 AHR Review Letter
• From: Chevron Mining Inc
• To: DRMS
• Annual Report Year: 2007
• Permit Index Doc Type: Hydrology Report
• Email Name: JDM
• 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]
July 4, 2008
Steven E. Leach
Chevron Mining Inc.
116 Inverness Drive East, Suite 207
Denver, CO 80112
RE: Edna Mine (Permit No. C-1980-001)
2007 Annual Hydrology Report Review
Dear Mr. Leach,
COLORADO
D IV IS I ON OF
RECLAMATION
MINING
SAFETY
Bill Ritter, Jr.
Governor
Harris D. Sherman
Executive Director
Ronald W. Cattany
Division Director
Natural Resource Trustee
The Division has completed its review of the above referenced report received on 20 Feb 2008. The
Division finds the 2007 Annual Hydrology Report (AHR) in compliance of the following Rules:
Rule 4.05.13(4)(a) - The data compiled in the 2007 AHR is kept and maintained at the Routt County
Court House.
Rule 4.05.13(4)(c) - The 2007 AHR is in compliance of this rule, as the report was received by the
Division on 20 February 2008.
Rules 4.05.13(4)(c)(i), (ii), (iii) - The 2007 AHR identifies the water quality data obtained during the
2007 water year. This includes data from each monitoring site. The AHR included interpretation of
the data and related impacts to the hydrologic balance.
Following is a review as per the predicted probable hydrologic consequences based on the base line
predictions in the Edna Mine permit. Predictions appear to be accurate and meet the operator's
obligations.
1. PHC: No direct disturbance of the quantity of water in Trout or Oak Creeks was
anticipated to occur (PAP page 2.5-96). Post-mining conditions to flows in Trout and Oak
Creeks from the permit area will be unchanged from which now exists (PAP page 2.5-98).
The quantity of water discharged from the mine site after reclamation was predicted to
nearly remain unchanged from pre-mining conditions after reestablishment of hydrologic
regimes (PAP page 4.6-61a).
Office of Office of
Mined Land Reclamation Denver • Grand Junction • Durango Active and Inactive Mines