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2015-07-28_REPORT - C1982056
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2015-07-28_REPORT - C1982056
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Last modified
8/24/2016 6:09:27 PM
Creation date
7/29/2016 10:12:18 AM
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Template:
DRMS Permit Index
Permit No
C1982056
IBM Index Class Name
Report
Doc Date
7/28/2015
Doc Name
Request for Extension to Submit Annual Hydrology Report, Including Draft Of Annual Hydrology Report
From
Twentymile Coal, LLC
To
DRMS
Annual Report Year
2015
Permit Index Doc Type
Hydrology Report
Email Name
JLE
DIH
Media Type
D
Archive
No
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flow patterns were exhibited at these sites with spring runoff periods accounting for the peak flows observed. At <br />all of these sites, the inverse relationship between flow and field conductivity continues to be evident. Water <br />quality parameters for these sites were within previously established ranges. A slight increase in conductivity at <br />site 8 has been noted over the last two years. This is attributed to increased discharge from Pond D, resulting <br />from overflows from the Area # 1 Pit (via DRMS site 7), which is partially fed by mine water as part of mine <br />dewatering operations for the old WMD and EMD. TC has been considering alternate treatment options for 10 <br />RT (EMD) mine water. A revision swill be submitted in 2015 regarding this. <br />Fish Creek: Nine surface flow monitoring sites are utilized on Fish Creek. Site 16A replaced site 16 in 2000, <br />and is located upstream of the Fish Creek Borehole discharge site 115. Historical data for site 16 may be found in <br />previous AHRs. Site 307 is located approximately one mile downstream of the Fish Creek Borehole mine <br />dewatering site and is monitored in conjunction with alluvial well 006 -AZ -3. Site 302 is located approximately <br />two miles downstream of the Fish Creek Borehole mine dewatering site. Site 305 is located upstream of the Fish <br />Creek Tipple and is monitored in conjunction with alluvial well 008 -AU -3. Site 27A is located immediately <br />upstream of the Fish Creek Tipple discharge (a.k.a. CDPS discharge site 62). Site 1003 is located downstream of <br />the Fish Creek Tipple site 62. <br />Monitoring requirements at sites 307 and 305 require monthly water level measurements (March through <br />September), and semi-annual field parameters. However, per PR03-06, site 305 now requires semi-annual water <br />quality testing. <br />Three relatively new surface sites were added in conjunction with the new Fish Creek Alluvium well sites (AVF- <br />13, AVF-14, and AVF-15), in order to evaluate potential subsidence impacts in the area. These are surface sites <br />SW -13, SW -14 (both added in August 2001), and SW -15 (added in June 2002). These sites require quarterly <br />water level measurements (March through September), and semi-annual field parameters and water quality <br />sampling. <br />Tables 37 through 45 provide summaries of the 2015 Water Year data collected at Fish Creek surface flow sites. <br />Tables 37a through 45a provide some historical summaries of collected data at each site for comparison. Figures <br />60 through 91 provide graphical representations of water levels and selected water quality parameters recorded at <br />each site. Again, typical flow patterns were exhibited at these sites with spring runoff periods accounting for the <br />peak flows observed. In general, an inverse relationship between flow and field conductivity was evident. 2006 <br />water quality parameters for these sites were generally within previously established ranges. <br />Fish Creek almost went dry briefly in late August 2015. Some surface sites (e.g. 1003) saw unusual short term <br />spikes in conductivity and TDS in 2013. Some of this may be related to heavy precipitation and erosion. 2015 <br />saw values return to historical values. 2015 saw some spring spikes in total recoverable iron concentrations (e.g. <br />sites 27A and 1003). This may be related to erosion from rapid snow melt. TC will continue to monitor this. <br />New surface sites SW -13, SW -14, and SW -15 (Tables 43-45, Figures 66-77) indicated elevated concentrations <br />for total recoverable (TR) iron in early June 2003, however iron concentrations dropped dramatically (about an <br />12 <br />
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