My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
2009-03-17_REPORT - C1981010 (5)
DRMS
>
Day Forward
>
Report
>
Coal
>
C1981010
>
2009-03-17_REPORT - C1981010 (5)
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
8/24/2016 3:44:27 PM
Creation date
3/18/2009 10:24:17 AM
Metadata
Fields
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
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
58
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
View images
View plain text
2.1 GROUND WATER-LEVEL CHANGES <br />2.1.1 SUMMARY <br />Significant mine activities during 2008 included the continued expansion of the A, F, G <br />and Z pits. Mining in the F pit, which started in 1997, continued in the M and Q seams with <br />additional mining in the I and L seams in 2004 through 2007. Mining was initiated in 2001 in the <br />G pit (H and K seams in 2007) and Z pit (I, K, L, M and Q seams in 2007). Dewatering occurred in <br />the A and F pits during 2007 at dewatering volumes of 27.53 and 7.00 ac-ft, respectively. Well <br />dewatering of 44.87 ac-ft was produced in 2007 near the G pit. <br />Annual precipitation for 2008 was near normal at 16.39 inches, compared to the Trapper <br />record and larger than the long-term record (Figure 2-1). The 2005, 2006 and 2007 precipitation <br />were above normal while the previous seven years of precipitation had been below normal, relative <br />to the Trapper average established since 1978 (see Figure 2-1). The 2008 average being near <br />normal compared to the Trapper average still resulted in a good recharge year. The last four years <br />were significantly above the long-term record average. Recharge in this geographic setting is <br />directly related to precipitation. <br />The effects of natural recharge variations on the respective aquifers can be observed in <br />wells located in undisturbed areas away from the influence of mining activities. Wells GC-2, GC-3 <br />and GP-9 are used to indicate natural response in the past but need to be used with caution starting <br />in 2000 due to mining moving into this area. Well GC-3 exhibited the alluvial water-level response <br />with a similar variation in water level in 2008. The effects on the 3rd White Sandstone aquifer are <br />observed in wells GC-2 and GP-9. Wells GC-2 and GP-9 show a water-level rise in 2008, showing <br />good recharge with the above average precipitation over the last few years. The HI aquifer (GP-7) <br />is characterized by steady water levels after a water-level decline in this aquifer over the previous <br />few years. The KLM aquifer showed a larger water-level decline in 2001 in well GP-8 and <br />Trapper Mining Company 2-2 <br />2008 Annual Report
The URL can be used to link to this page
Your browser does not support the video tag.