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REP11295
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REP11295
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Entry Properties
Last modified
8/24/2016 11:42:34 PM
Creation date
11/27/2007 12:38:40 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1982056
IBM Index Class Name
Report
Doc Date
4/10/2006
Doc Name
2005 Annual Hydrology Report
From
Twentymile Coal Company
To
DMG
Annual Report Year
2005
Permit Index Doc Type
Hydrology Report
Media Type
D
Archive
No
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water level data previously recorded for well 006-83-48C. Some dewatering of the aquifer does occur from the <br />pumping of we11 00 1-83-106 to supply the mine with domestic water. <br />The southernmost Trout Creek well, 001-83-107 (Figure 19), water levels continue to decline. Located down dip <br />of the TCC facility water well (001-83-106), steady declines in water level since the early 1990 may reflect <br />effects from longwall mining that began in the western mining district in 1990, in addition to water well use <br />(Figure 21). <br />Well FBR-2-E (Figure 22), located along the eastern permit boundary exhibited consistent water levels until earl y <br />1999, then dropped about 50 feet and immediately stabilized with consistent water levels at the lower depth <br />through 2005. The specific reason for this drop is not apparent, although many historical boreholes and some <br />faulting exists in the general vicinity. Water levels were at the 6665 ft elevation doting 2005, which is similar to <br />the previous four water years. TDS values for FBR-2-E (Figure 23) dropped in 2001, but have subsequently <br />rebounded back to historical values, and dropped slightly in 2005 (but still remain within historic values). The <br />exact reason for this decline is unknown. <br />Well 97013TC (Figure 24) water levels remain consistent with that of the last two years. Water quality values for <br />we1197013TC (Figure 25) appear consistent with historical values. <br />FSsh Creek Sandstone: Two Fish Creek Sandstone wells (91M001 and 91M004) require monitoring on a <br />. semiannual basis for water level only. These requirements were met during 2005. An additional well (Ashley) <br />requires semi-annual monitoring for water levels and field parameters, and annual water quality sampling. Tables <br />15 through 17 provide summaries of the 2005 Water Year data collected at each site. Tables 15a through 17a <br />provide historical statistical summaries of collected data at each site through 2005. Tables 15b through 17b <br />provide period of record water ievel summaries for each site. Figure 26 provides graphical representation of the <br />period of record water levels measured at sites 91M001 and 91M004. Water levels at the Ashley well (Figure 27) <br />dropped appreciably after subsidence, but have continued to recover since 1998. TDS values at the Ashley well <br />(Figure 28) have continued a general decline since 1996. Field measurements and water quality parameters for <br />the Ashley welt are provided on Table 17. Water quality values were within the typical historical range of other <br />wells in this aquifer. <br />3.2 Alluvial Groundwater Monitorine <br />Table 18 presents a summary of alluvial well monitoring frequencies, which was last updated for Permit Revision <br />6 (PR 03-06) in March of 2004. <br />Alluvial ground water in the Twentymile Park Basin exists under unconfined conditions within the alluvial <br />materials underlying the major surface drainages of the area and backfilled areas of adjacent surface mined areas. <br />Stream flows are the primary source of recharge to the alluvial aquifers. Alluvial deposition is limited in areas <br />. where stream gradients are relatively steep and in areas where the stream channel has eroded to or intersects <br />resistant bedrock. Consequently, the alluvial deposits do not tend to be continuous, Shallow wells completed in <br />these deposits indicate that they are usually less than 20 feet [hick and the depth to ground water is typically less <br />6 <br />
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