REV91866

• Permit No: C1981010
• IBM Index Class Name: Revision
• Doc Date: 5/10/1999
• Doc Name: PN C-81-010 TR 78 ANNUAL REPORT
• From: TRAPPER MINING INC
• To: DMG
• Type & Sequence: TR78
• Media Type: D
• Archive: No

M
TRAPPER Ct~NtNC ANC.
December 18, 1998
-~crF_tVi~D
Mr. Tom ICaldenbach
Environmental Protection Specialist . -. ~. ~.~merals & Geology
Division Of Minerals and Geology
1313 Sherman Street, Room 2I5
Denver, CO 80203
RE: Permit No. C-81-010; Technical Revision TR-7S, 1997 Annual Resort
Deaz Mr. ICaldenbach:
>n response to comments in your letter dated October 6, 1998, Trapper is submitting the following
information for your consideration.
Comment 2.) Missing hydrologic monitoring data. The Division has compared the monitoring data
contained in the report to the monitoring requirements in Trapper's permit (Section 4.8.S.la for surface
water and Section 4.8.5.2a for groundwater). Table I, below, lists specific monitoring data not found in
the report which are required by the permit. The Division would expect one-time omissions of these data
not to hinder the monitoring program, but requests an explanation for these omissions in order to evaluate
the effectiveness of the overall monitoring procedures.
Response 2.) Two factors contributed to the omission of List A-3 metals at outfalls 013, 015, and 017.
Fall '97 sampling at these outfalls occurred in response to a significant rainfall event which produced
discharge for the first time in several months from these sites. The discharge occurred for only a short
time. As a consequence, at the time Fall '97 samples were collected, the emphasis was on compliance
with the NPDES permit requirements at Trapper. Samples for List A-3 parameters were overlooked due
to a change in personnel contributing to a lack of awareness of the additional sample requirements at the
time. Trapper has since modified its surface water data collection sheets to better track sampling
requirement status ar each site and has reemphasized the practice of collecting appropriate samples as
early as possible in the monitoring period be it monthly, quarterly, or semi-annually.
Fall water level measurement omissions at wells GB-1, GB-2, and GB-5 occurred due to the fall sampling
cycle being interrupted by inclement weather causing the contractor to leave the site and return at a later
date to finish the work. The wells were simply forgotten during this process. 'These omissions were
addressed in the Annual Hydrology Report on page 1-2.
The remaining data omissions noted occurred as a result of changing labs during the year which in turn
resulted in a changed data reporting format. Data is available for these omissions and will be included in
the 1998 Annual Hydrology Report.
Comment 4.) TDS discussion: Pre-mining vs. post-mining, page 6-6, 2"" paragraph. The third
sentence in this paragraph says: "The TDS of the surface water from the mine area is similar to [he
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