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2009-03-17_REPORT - C1981010 (5)
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2009-03-17_REPORT - C1981010 (5)
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Last modified
8/24/2016 3:44:27 PM
Creation date
3/18/2009 10:24:17 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1981010
IBM Index Class Name
REPORT
Doc Date
3/17/2009
Doc Name
2008 Annual Hydrology Report
From
Trapper Mining Inc
To
DRMS
Annual Report Year
2008
Permit Index Doc Type
Hydrology Report
Email Name
JDM
Media Type
D
Archive
No
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0 continued on a smaller decline rate in 2002 through 2005 with a water level rise in 2006 and steady <br />levels in 2007 and 2008. A significant amount of well dewatering occurred from the G pit area in <br />2008. <br />Steady water levels had been observed in the previous four years in well GMP-1 while a <br />small increase was observed in 2005 through 2008. 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 2008 while some dewatering occurred from the A 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 and overall increased a larger amount in 2008. The water <br />levels in KLM well GP-2 increased at a higher rate in 2008. The previous decline could have been <br />caused by the decrease in recharge and mining in this area. <br />Water-level changes are discussed in more detail in the following section. <br />• <br />2.1.2 WATER-LEVEL CHANGES <br />Water-level changes for 2008 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-level plots according to aquifer where possible but, in most cases, are grouped by similar <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 2008. 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 2008 were above or near normal. Water levels in <br />many of the wells reflect the natural variations in recharge. These changes may lag the actual <br />Trapper Mining Company 2-3 <br />2008 Annual Report
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