2008-12-11_REPORT - C1981010

• Permit No: C1981010
• IBM Index Class Name: REPORT
• Doc Date: 12/11/2008
• Doc Name: 2007 AHR Letter
• From: DRMS
• To: Trapper Mining, Inc
• Annual Report Year: 2007
• Permit Index Doc Type: Hydrology Report
• Email Name: TAK
• Media Type: D
• Archive: No

Require-
ment
Requirement Regulation complied Comment
with ?
(yes / no)
V. Minimization of
disturbance to the CDRMS
hydrologic regulation yes
balance within 4.05.1(1)
and adjacent to
the permit area
W. Prevention of The only apparent significant impact to surface water
material damage CDRMS outside the permit area has been TDS loading of surface
to the hydrologic regulation yes streams, and this impact has not impaired water use. There
balance outside 4.05.1(1) are no data indicating impacts to an aquifer outside the
the permit area permit area.
The only apparent major hydrologic impacts at Trapper
are TDS loading of the following waters: No Name Gulch
stream flow, ground water and spoil backfill at wells GF-7
and GF-11, and the 3rd White sandstone at well P-8.
Although these are major local impacts, they do not rise to
the level of material damage because use or potential use is
X. Agreement of CDRMS not impaired. Of these impacts, only the impact at well P-8
observed regulation has not undergone final bond release.
hydrologic (2)
and The TDS increase in No Name Gulch was addressed in

impacts with requir
ement
requir
DMG's review of Trapper's 1997 annual report (TR-78).
"probable to keep
information yes TDS loading of ground water in the 3rd White Sandstone
hydrologic in well P-8 may be the result of suspected spoil leachate
consequences" current,
CDRMS discharging from A-pit 1100 ft. upgradient from the well.
(PHC) projected Surface infiltration may affect the well because the well is
in mining permit regulation
2.03.3(1) only 35 feet deep. The well is completed in sandstone beds
that probably are permeable, and that may be in direct
communication with the land surface. Well P-8 is 150 feet
from a pond which has high inflows (East Pyeatt #1). High
nitrate content of samples in past years may indicate the
well receives infiltration of surface water.
Y. Adequacy of CDRMS
ground water regulation yes
monitoring program 4.05.13(1)
Z. Adequacy of CDRMS
surface water regulation yes
monitoring 4.05.13(2)
program
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