REP50267

• Permit No: C1981025
• IBM Index Class Name: Report
• Doc Date: 1/10/2003
• Doc Name: 2002 AHR Review Memo
• From: Byron Walker
• To: File
• Annual Report Year: 2002
• Permit Index Doc Type: Hydrology Report
• Media Type: D
• Archive: No

STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY
Department of Natural Resources
1313 Sherman St., Room 215
Denver, Colorado 80203
DIVISION o F
Phone: [phone] !Vt I N E RA L $
FAX: [phone] &
GEOLOGY

Interoffice MEMORANDUM RECLAMATION
MINING•SAFETY
Bill Owens
to: File C-81-025, North Thompson Creek Mines, 2002 Annual Hydrology Reporfovernor
from: B on G. Walker ~ Greg E. Walther
Executive Director
subject: Review for Compliance, 2002 Annual Hydrology Report (AHR) Ronald W. Cattany
date: January 10, 2003 Acting Division Director
Rule 4.05.13(4)(b): Ground water and surface water data collection shall be based upon a water
year (October 1 through September 30), unless otherwise approved by the Division.
The report is in compliance with this rule. The Division has approved submittal on a calendar
yeaz basis [Permit Application Package (PAP) page 4-122].
Rule 4.05.13(4)(c): A hydrologic report shall be submitted to the Division annually with the date
ofsubmittal determined in consultation with the permittee. The annual hydrologic report shall
contain at a minimum:
The report is in compliance with this rule. The date ofsubmittal of March 30 is stated in the PAP
(page 4-122). The report was submitted under a MINREC, INC. letter of January 6, 2003 and
received in the Division of Minerals and Geology (Division) on January 8, 2003.
Rule 4.05.14(4)(c)(i): Water quantity data obtained from each monitoring site during the water
year;
The report is in compliance with this rule. Water quantity data was submitted by calendar yeaz in-
lieu-oftyater yeaz.
Groundwater quantity data of the monitoring program is limited to quarterly measurements of water
level in Wells D-lA and D-2A (PAP page 3-61). These data aze reported in compliance with the
permit. Although monitoring of water levels in Mine 3 was discontinued (piezometers PZ-2 and PZ-
3) byprevious revisions, mine water levels aze included in the report (Appendix III). Measurements
were taken on 04/25/02 and 07!08!02, through an opening into the mine.
Discharges of mine water are included in surface water monitoring. Surface water quantity
monitoring requirements include those of the Colorado Permit Discharge System (CDPS) permit
(PAP page 3-86). The combined total of flows from Mine 1 and Mine 3 aze reported, starting in
August of 1995, in compliance with a change to the CDPS permit. The report states (page 5) that
there were no discharges from sedimentation ponds [at CDPS outfalls 002 (Sediment Pond P-9) and
005 (Refuse Pile Sediment Pond)]. Copies of Discharge Monitoring Reports are included in the