REP08807

• Permit No: M1988112
• IBM Index Class Name: Report
• Doc Date: 12/31/1993
• Doc Name: REVIEW OF DRAFT SUMMARY REPORT FOR OCT 93 THIRD PARTY MONITORING TRIP
• From: DMG
• To: RCG HAGLER BAILLY INC
• Media Type: D
• Archive: No

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STATE OF COLORADO
DIVISION OF MINERALS AND GEOLOGY op~co~
Department of Natural Resources a~' -~ q
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1313 Sherman SI., Room 215
Denver, CO 80203 ~'
Phone: [phone] rays ~
FA%:13031 83 2-81 06
Roy ROmer
Governor
michael R. long
Division Director
December 31, 1993
Ann Maest, Ph.D
RCG/Hagler Bailly, Inc.
P.O. Drawer O
Boulder, CO 80306-1906
RE: Review of Draft Summary Report for October 1993 Third-Party
Monitoring Trip
Dear Dr. Maest:
The Division received the above-cited report on December 29. Prior to
releasing this report please consider addressing the Following few
discrepancies.
1. Acceptance criteria for duplicate analyses were not met for total
cyanide analyses of samples from the upper and lower tailing
impoundments and re-analysis of these samples took place after the
EPA-recommended holding time.
If this situation has led to invalid results, it should be stated
so more directly in the conclusions, and recommendation should be
made that new samples be collected and new analysees performed.
BMRI should not have to bear the cost of the new analyses, except
as set forth in their contract with Core Labs. In the event these
points need to be re-sampled, RCG/HBI should discuss with the
Division and BMRI whether RCG/HBI will conduct the sampling.
2. Total cyanide analysis of Sample "Well M-9" was conducted two days
after the holding time.
If these results are invalid, the conclusions should state so
directly. If a new sample must be collected and analyzed, that
too should be stated in the conclusions.
3. Table 3 should include a footnote under well M-9 stating that
analysis of total cyanide exceeding the holding time by 2 days, in
keeping with the notes compiled for other out-of-spec analyses.