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2008-03-14_REPORT - C1981010 (5)
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2008-03-14_REPORT - C1981010 (5)
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Last modified
8/24/2016 3:25:13 PM
Creation date
3/14/2008 1:03:23 PM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981010
IBM Index Class Name
REPORT
Doc Date
3/14/2008
Doc Name
2007 Annual Hydrology Report to Appendix A
From
Trapper Mining Inc
To
DRMS
Annual Report Year
2007
Permit Index Doc Type
Hydrology Report
Email Name
DIH
Media Type
D
Archive
No
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level decline in 2001 in well GP-8 and continued on a smaller decline rate in 2002 through 2005 <br />with a water level rise in 2006 and levels in 2007. A si 'cant amount of well dewaterin <br />steady gnifi g <br />occurred from the G pit area in 2007. <br />Steady water IeveLs had been observed in the previous four years in well GMP-1 while a <br />small increase was observed in 2005 through 2007. The previous ten years show a water level rise <br />due to the movement of Pit A to the east of this area. No dewatering was produced from the Z pit <br />in 2007 while some dewatering occun~ from the A, F and G pits. The decrease in water levels in <br />wells GD-2 and GD-3 in 2006 were caused by deep exploration drilling in this area. Water Levels <br />in these two wells gradually rose in 2007. The water levels in KLM well GP-2 overall were higher <br />in 200?. The previous decline could have been caused by the decrease in recharge and mining in <br />this area. <br />Water-level changes are discuses in more detail in the following section. <br />• <br />2.1.2 WATER LEVEL CHANGES <br />Water-level changes for 2007 are presented in Figures A-1 through A-11 in Appendix A. <br />The table in Appendix A list all historical data for the Trapper Mine. The wells are grouped on the <br />water-Ievei plots according to aquifer where possible but, in most cases, are grouped by similaz <br />water-level elevations. Table A-1 in Appendix A presents a tabulation of the water-level elevations <br />for each of the monitoring wells. Figure 2-1 presents the total annual precipitation at the Trapper <br />Mine from 1978 through 2007. Precipitation declined from a high in 1983 to a low in 1988 and had <br />increased again to a peak in 1993 with a below average value in 1994. The years 1995 through <br />1997 had above average precipitation relative to the Trapper Mine record, while 1998 through 2004 <br />were below. The precipitation in 2005 through 2007 was above normal. Water levels in many of <br />the wells reflect the natural variations in recharge. These changes may lag the actual precipitation <br />events due to the time it takes the head change to move through the aquifer to the monitoring well. <br />Trapper Mining Company 2-3 <br />2007 Annual Report <br />
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