2007-03-16_REPORT - C1981010 ‎(8)‎

• Permit No: C1981010
• IBM Index Class Name: REPORT
• Doc Date: 3/16/2007
• Doc Name: 2006 AHR Section 2.0 Ground Water Levels
• Annual Report Year: 2006
• Permit Index Doc Type: Hydrology Report
• Media Type: D
• Archive: No

Welts GP -5 and GP -6 are useful in defining natural variations in the QR aquifer for
2006. Water levels in wells GP -5 and GP -6 show a rising trend from 1995 through 1998 with an
overall gradual rise from 1998 to 2002. Water levels in these two wells have been fairly steady the
last five years with a small increase in the levels in 2006. Well GP -8 has been used as a baseline
for precipitation/recharge impacts on the KLM aquifer and showed a significant decline in water
levels during 2001 through 2005 followed by a rise in 2006. Mining is close enough to this well
that its water level responses cannot be used relative to baseline conditions for the last six years.
Figure A -1 presents water levels versus time for wells GF -5 and P -5. The wells are
completed in the HI backfill and 2nd White Sandstone aquifers, respectively. Water levels in well
GF -5 were steady in 2006, while well P -5 stayed dry in 2006. Water level in HI well GP -7 (Figure
A -9) shows an overall small decline in the HI aquifer for 2006. This well has been used in the past
to observe natural changes in this aquifer.
The GC wells (GC -1, GC -2, GC -3, see Figure A -2) are located near the northeast comer
of the permit area (PA) slightly more than 1100 feet from mining activity in 2006. These wells are
completed in the HI, 3rd White and alluvial aquifers, respectively. The water -level changes in these
wells may not still be good indicators of natural recharge impacts on these aquifers due to the
upgradient mining. Water levels in well GC -1 were higher in 2002 through 2006 than they were in
2000 and 2001 but within natural variations. Overall decline in water level were observed in well
GC -3 in 2006 but within natural changes previously observed. Water levels in well GC -2 were
steady in 2006. These changes in these three wells are probably natural. The alluvial aquifer
response indicates less recharge in 2006 than in 2005.
Figure A -3 presents the static water -level elevations for wells GD -2, GD -3 and GP -9.
These wells are completed in the QR, QR backfill and 3rd White Sandstone aquifers. In 2006,
water levels in wells GD -2 and GD -3 declined sharply the first quarter of 2006 and then became
Trapper Mining Company 24
2006 Annual Report