2013-12-10_REPORT - C1981025

• Permit No: C1981025
• IBM Index Class Name: REPORT
• Doc Date: 12/10/2013
• Doc Name: 2012 AHR Review Letter
• From: Susan Burgmaier
• To: Brock Bowles
• Annual Report Year: 2012
• Permit Index Doc Type: Hydrology Report
• Email Name: BFB
• Email Name: SB1
• Media Type: D
• Archive: No

December 10, 2013
To: Brock Bowles
From: Susan Burgmaier
Re: North Thompson Creel Mine (Permit No. C- 1981 -025)
2012 Annual Hydrology Report
Adequacy Review
Per your request, I have reviewed the North Thompson Creek 2012 AHR. I have the
following comments:
1. Water monitoring frequency requirements:
The currently approved Hydrologic Monitoring Plan is presented on page 3 -86 of the
approved permit application package. There is no requirement to obtain flow data
on North Thompson Creek, nor is there a requirement for ground water monitoring.
The approved monitoring plan requires water quality samples on North Thompson
Creek in May and September for the following parameters: Total Dissolved Solids,
pH, Calcium, Iron, Manganese, Sulfate, Copper, Total Suspended Solids,
Bicarbonate, Chloride, Magnesium, Sodium, and Zinc. The 2012 North Thompson
Creek samples were not analyzed for Calcium, Sulfate, Bicarbonate, Chloride,
Magnesium, or Sodium. Please explain why full suite samples were not
performed and /or documented in the 2012 AHR, as required by the approved
permit application package and Rules 4.05.13(2), (3), and (4).
2. CDPS monitoring:
Minrec, Inc. reports no discharge at Outfall 001, since there was no discharge
directly to North Thompson Creek. It is our understanding that any discharge
through the Outfall 001 flume would constitute a discharge at this point, regardless
of where the flow is directed after crossing the Outfall 001 discharge point.
Accordingly, the Division believes that Minrec, Inc. should be recording and
analyzing discharges from Outfall 001 in accordance with the approved CDPS
permit.
3. Surface water quality:
The water quality data provided for North Thompson Creek indicates little change in
water quality at the downstream point, below Outfall 001, when compared to the
upstream data. Monitoring data does not indicate that there is any mine related
degradation in water quality on North Thompson Creek.
4. Monitoring results to date are generally in line with the predicted impacts to the
hydrologic balance summarized in the report and detailed in the approved permit
application package.
Should you or the operator have any questions, please let me know.