REP46451

• Permit No: C1982057
• IBM Index Class Name: REPORT
• Doc Date: 3/27/2007
• Doc Name: 2006 AHR Review
• From: Dan Mathews
• To: Sandy Brown and Mike Boulay
• Annual Report Year: 2006
• Permit Index Doc Type: Hydrology Report
• Media Type: D
• Archive: No

STATE OF COLORADO
DIVISION OF RECLAMATION, MINING AND SAFETY
Department of Natural Resources
7 313 Sherman St., Room 215
Denver, Colorado 80203
Phone: [phone]
FAX: [phone]
DATE: March 27. 2007
TO: Sandy Brown and Mike Boulay
FROM: Dan Mathews
RE: 2006 Water Year Annual Hydrology Report
Seneca II-W Mine, Permit No. C-1982-057
COLORADO
DIVISION OF
RECLAMATION
MINING
- &-
SAFETY
Bill Ritter, fr.
Governor
Harris D. Sherman
Executive Director
Ronald W. Cattany
Division Director
Natural Resource Trustee
I have completed an initial review of the 2006 AHR for Seneca II-W. As usual, the report was thorough and
comprehensive. Monitoring appears to have been conducted in compliance with permit specified schedules
at approved sites, and the report includes appropriate data presentation and discussion/evaluation of
observed compliance with relevant standards and PHC projections.
As in previous years, there are a few exceedances of water use standards at several sites, for various
parameters. Also, as noted last year, there are a few wells that had TDS values exceeding PHC projections.
I will let the reviewing hydrologist evaluate the significance of these exceedances.
Also, it appears that the PHC review has not yet been done for last year's report (see my preliminary review
memo dated April 11, 2006). So, I need to request PHC review by a hydrologist for both the 2005 and 2006
Seneca II-W AHR's.
Office of Office of
Mined Land Reclamation Denver • Grand Junction Durango Active and Inactive Mines