1998-08-04_HYDROLOGY - M1977493

• Permit No: M1977493
• IBM Index Class Name: HYDROLOGY
• Doc Date: 8/4/1998
• Doc Name: Resolutions of Findings and Coditions for Eagle Park
• Media Type: D
• Archive: No

Condition No. 1
Climax Molybdenum Company ("Climax") will maintain water levels and operational controls
on Eagle Park Reservoir to prevent delivery of water to the Eagle River until such time as
the Division of Minerals and Geology ("DMG") has accepted and approved all data from the
approved monitoring plan up to and including water quality data from the sampling event
conducted in the second quarter of 1998. These data were provided in the June 8, 1998
meeting at the WQCD offices. Condition 1 has therefore been satisfied.
Condition No. 2
The DMG will hold the option to rescind its conditional finding that post mining land use of
developed water resources for Eagle Park Reservoir has been achieved if, upon review of
the data and consultation with the Water Quality Control Division ("WQCD"), it is determined
that the discharge results in exceedences of the chronic water quality standards. The
conditional finding will become final based the acceptance of a report on data gathered over
a three-year monitoring period.
The monitoring period will commence with the first release of water and occur during the first
three years of reservoir water delivery.
Data used to judge long-term performance would be obtained by sampling the reservoir
water at the outlet works during delivery. Sampling during reservoir water deliveries will be
conducted as suggested in the April 6 1998 DMG letter (page 3, item d). Concurrent
sampling in the East Fork of the Eagle River below the confluence of reservoir and river
waters during reservoir deliveries will be conducted in order to compare data in the final
report. Quarterly sampling in the reservoir will continue through the fourth quarter of 1998
as agreed to in the April 6, 1998 letter from DMG. Climax uses a depth bomb water
sampling device made of Teflon to extract samples from depth in the reservoir. Collection
and sampling methodologies are aligned with the Sampling and Analysis Plan (SAP)
submitted in the April 15, 1997 Eagle Park Reservoir data summary for the reservoir.
Upon completion of the three-year period, a report will be submitted to the DMG that
summarizes the data and compares the reservoir water quality with in-stream'water quality
and the applicable standards. An anti-degradation type evaluation will be included in this
report. If the data demonstrate that degradation has occurred during the first three years of
reservoir water delivery, DMG's consideration of final approval of SR-002 will be continued
while investigation is conducted into the source of contaminants that caused degradation to
occur. The plan for the investigation will be developed by Climax and subject to DMG
review and approval. If the investigation determines that the contaminant source is related
to the operations of the Climax Mine, the source will be mitigated in accordance with a plan
approved by the DMG prior to SR-002 final approval.
Contingency monitoring and response will be performed as follows:
• If an exceedence of a water quality standard is measured in the release from the
Eagle Park Reservoir weekly monitoring shall commence at a location downstream
of the confluence between the reservoir release and the Eagle River, for parameters
agreed upon by Climax and DMG, If an exceedence is noted at the downstream
monitoring location for the same parameter(s) for two consecutive tests, DMG will be
notified and Climax will take the necessary measures to determine the source of the
exceedence. This may include monitoring the reservoir outlet, monitoring within the
reservoir, verification that the cut off systems are properly functioning, monitoring
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