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2014-05-28_REPORT - C1982056 (4)
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2014-05-28_REPORT - C1982056 (4)
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Last modified
3/29/2017 12:50:52 PM
Creation date
5/28/2014 10:16:01 AM
Metadata
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Template:
DRMS Permit Index
Permit No
C1982056
IBM Index Class Name
Report
Doc Date
5/28/2014
From
Twentymile Coal Company
To
DRMS
Annual Report Year
2013
Permit Index Doc Type
Hydrology Report
Email Name
JDM
DIH
Media Type
D
Archive
No
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Alluvial deposits containing groundwater are monitored in the Foidel Creek, Fish Creek, Trout Creek and Middle <br />Creek drainages. In the Foidel Creek drainage, sites both upstream and downstream of the TC portals and <br />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 2013 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 2013 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. 2012 was a significant <br />drought year. 2013 had a decent snow year. Well 009 -5 -10 provides data for the alluvial aquifer upgradient <br />from the mine portals. Water levels in 009 -S -10 for 2006 (Figure 29) are consistent with observed historical <br />seasonal fluctuations. Conductivity values at well 009 -5 -10 (Figure 30) remain consistent with historical values. <br />Well 001 -5 -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 -5 -5 for 2013 (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. 2013 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 -5 -5 through 2010 <br />(Figure 32). Conductivity values dropped in 2013, but are still within historic levels. Down gradient, field <br />conductivities at well 008 -AV -2 ranged between 1480 and 1830 for 2013. 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 2013 <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 />8 <br />
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