2014-07-25_REPORT - C1981010

• Permit No: C1981010
• IBM Index Class Name: Report
• Doc Date: 7/25/2014
• From: DRMS
• To: Trapper Mining, Inc
• Permit Index Doc Type: Annual Reclamation Report
• Email Name: JLE
• Media Type: D
• Archive: No

Requirement
Regulation
Reviewed
Comment
Several issues were identified with the monitoring
frequency:
• Ground water quality data was not submitted for
wells P -3 or P -5 for 2013. Data through June
2005 and June 2011 was submitted for wells P-3
and P -5 respectively. Well P -3 has been reported
to have been dry since 2005. According to the
report well P -5 only had a sufficient amount of
water to sample in 2011.
• Well P-3 has been reported to be dry since the last
measurements were taken in June of 2005. Prior
to this, the water elevation's almost mirrored the
elevations measured at well P -1 until the well was
Table 4.8 -13a
reported to be dry. This is logical given the
P. Sampling
of CDRMS
construction of this well and its proximity to P -1.
frequency of
mining
Comment
It was unclear why well P -3 went dry. Upon
groundwater
permit C -81-
further investigation there appears to be a problem
monitoring wells
010
with the well. The Division sent an adequacy
review letter for TR113 on April 24, 2014 asking
Trapper to look into this issue. On July, 17, 2014
the Division received a response letter back from
Trapper and they indicated the P-3 well casing has
either cracker, sheared or collapsed. Trapper also
indicated monitoring of the Lewis Shale at the
mine should not be necessary and they would like
to abandon the well and cease monitoring of this
aquifer. If Trapper would like to abandon this
well, they need to submit a technical revision to
change the ground water monitoring plan to
account for this along with justification for
ceasing monitoring at this location /aquifer.
Q. Parameters to be
Table 4.8 -13
analyzed in
of CDRMS
groundwater
mining
Yes
samples
permit C -81-
010
Well GP -9 monitors the Third White Sandstone immediately
downgradient from Trapper's pits at a location where a
leachate plume can be expected to form, as explained in the
PHC (Section 4.83 of the permit). Well GP -9 is Trapper's
ground water point of compliance for the Third White
Sandstone as explained on permit page 4 -242. In general,
the 2013 data from well GP -9 does not exceed Basic
R. Basic Standards
CWQCC
Standards for Ground Water for a domestic use
for Ground Water
regulations
Comment
classification based on the parameters analyzed. (This
41.4 and 41.5
classification is for the Third White Sandstone in a Specified
Area that extends outward from Trapper's northern permit
boundary on the east half of the mine to the axis of the Big
Bottom Syncline, a distance ranging between 1/2 and 3/4
mile from the boundary.) There are exceedances of drinking
water standards for Fe and Mn; however, Fe and Mn
exceedances also occurred in well GP -9 prior to mining in
the area upgradient of this well. Furthermore, other
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