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2012-03-12_REPORT - C1982056 (2)
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2012-03-12_REPORT - C1982056 (2)
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Last modified
8/24/2016 4:55:04 PM
Creation date
3/12/2012 10:47:19 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1982056
IBM Index Class Name
Report
Doc Date
3/12/2012
Doc Name
2011 Annual Hydrology Report (1 of 2)
From
Twentymile Coal Company
To
DRMS
Annual Report Year
2011
Permit Index Doc Type
Hydrology Report
Email Name
JDM
DIH
Media Type
D
Archive
No
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support facilities are monitored. In the Fish Creek Drainage, sites upstream and downstream of the Mine 2 area <br />and the Fish Creek Borehole mine dewatering facilities are monitored. <br />Foidel Creek Alluvial Groundwater: There are four Foidel Creek alluvial wells, 009 -S -10, 001 -S -5, 008 -AV- <br />1, and 008 -AV -2. Tables 19 through 22 provide summaries of 2011 data collected at each site. Tables 19a <br />through 22a provide historical statistical summaries of collected data at each site. Figures 29 through 33 provide <br />graphical representations of water levels and selected water quality parameters recorded at these sites. <br />Water levels during 2011 remained generally consistent with established ranges and patterns and showed the <br />typical seasonal variability of elevated water levels in the spring. Note that the winters of 2007 and 2011 saw <br />some record snow falls, which is exhibited in the higher water level elevations detected. Well 009 -S -10 provides <br />data for the alluvial aquifer upgradient from the mine portals. Water levels in 009 -S -10 for 2006 (Figure 29) are <br />consistent with observed historical seasonal fluctuations. Conductivity values at well 009 -S -10 (Figure 30) <br />remain consistent with historical values. <br />Well 001 -S -5 is located just downgradient from the mine portals and surface facilities location, and is monitored <br />in conjunction with surface water monitoring site 8. Water levels saw a rise due to record snow melt (Figure 33). <br />Conductivity values in 001 -S -5 for 2011 (Figure 31 and 32) are consistent with observed historical seasonal <br />fluctuations. <br />Data for wells 008 -AV -1 and 008 -AV -2 are provided in Tables 21 and 22, respectively. 2011 data was consistent <br />with historical values. Water levels in these wells and the stream show the typical seasonal interrelationship of <br />relatively rapid increases and declines associated with spring runoff. The longer -term trends in water levels at <br />these sites generally parallel the fluctuations observed in annual stream flows. <br />Field conductivity measurements in general at well 001 -S -5 were noted to be slightly lower than the up gradient <br />site, 009 -S -10. There appears to be a general increasing field conductivity trend for well 001 -S -5 through 2010 <br />(Figure 32). Conductivity values dropped in 2011, but are still within historic levels. Down gradient, field <br />conductivities at well 008 -AV -2 ranged between 1480 and 1830 for 2011. Field conductivity measurements at <br />wells 008 -AV -1 and 008 -AV -2 are comparable and occurred within previously established ranges for these sites. <br />Fish Creek Alluvial Groundwater: Monitored water quality parameters exhibited values at the Fish Creek <br />alluvial wells which were typically within previously established ranges. There are four older Fish Creek alluvial <br />wells (006 -AY -1, 006 -AZ -3, 008 -AU -3 and 008- AW -3). Tables 23 through 26 provide summaries of the 2011 <br />Water Year data collected at each site. Tables 23a through 26a provide POR statistical summaries of collected <br />data at each site. Figures 34 through 37 provide graphical representations of water levels and selected water <br />quality parameters recorded at each site. <br />In addition to the four wells discussed above, three additional alluvial wells, AVF -13 and AVF -14 (installed in <br />August 2001), and AVF -15 (installed June 2002) were added per PR99 -05, 4e-7. Monitoring frequencies for <br />these wells are different than that for the four older wells above (see Table 18). <br />8 <br />
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