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2008-02-29_REPORT - C1982056
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2008-02-29_REPORT - C1982056
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Last modified
8/24/2016 3:23:51 PM
Creation date
2/29/2008 1:29:03 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1982056
IBM Index Class Name
REPORT
Doc Date
2/29/2008
Doc Name
2007 Annual Hydrology Report
From
Twentymile Coal Company
To
DRMS
Annual Report Year
2007
Permit Index Doc Type
Hydrology Report
Media Type
D
Archive
No
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• Tables 33 through 36 provide summaries of the 2007 Water Year data collected at each site. Tables 33a, 34a, and <br />35a provide POR statistical summaries of collected data at each site. Figures 52 to 59 and 102 to 105 provide <br />graphical representations of water levels and selected water quality parameters recorded at each site. Typical <br />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. <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 maybe found in <br />previous AHIZs. Site 307 is located approximately one mile downstream of the Fish Creek Borehole mine <br />dewatering site and is monitored in conjunction with alluvial we11006-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 2007 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 />New surface sites SW-13, SW-14, and SW-15 (Tables 66 through 77) indicated elevated concentrations for total <br />recoverable iron in early June 2003, however iron concentrations dropped dramatically (about an order of <br />magnitude) by August 2003. With the exception of total recoverable iron, none of the values recorded during the <br />initial sampling episode fell outside the typical historical range of other surface sites on Fish Creek. In 2007 iron <br />values ranged between 290 mg/1 to a high of 4280 mg/1. This is typical for historical seasonal fluctuations, with <br />spikes often seen during high runoff period, most likely relating to fresh erosion. Analytical data relating to these <br />sites is discussed further in section 4.0 on Subsidence Impacts. <br />10 <br />
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