My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
2015-07-28_REPORT - C1982056
DRMS
>
Day Forward
>
Report
>
Coal
>
C1982056
>
2015-07-28_REPORT - C1982056
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
8/24/2016 6:09:27 PM
Creation date
7/29/2016 10:12:18 AM
Metadata
Fields
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
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
21
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
View images
View plain text
in 2007 through 2008 (Figure 20). The declines may have been influenced by the underground mining operation <br />Since 2009 levels appear stable. <br />Significant inflows from the Trout Creek Sandstone into the mine workings have not been encountered to date to <br />account for the apparent lowering of the potentiometric surface in the Trout Creek formation, as indicated by the <br />water level data previously recorded for well 006-83-48C. Some dewatering of the aquifer does occur from the <br />pumping of well 001-83-106 to supply the mine with domestic water. <br />The southernmost Trout Creek well, 001-83-107 (Figure 19), water levels continued to decline from the early <br />1990s through 2012, and have appear stable since, with a small rise in 2015. Located down dip of the TC facility <br />water well 001-83-106 (Figure 18), had appeared stable since 2000. Declines in water level at that well in the late <br />1980's into the 1990s reflect effects from longwall mining that began in the western mining district in 1990, in <br />addition to water well use. <br />Well FBR-2-E (Figure 22), located along the eastern permit boundary exhibited consistent water levels until early <br />1999, then dropped about 50 feet and immediately stabilized with consistent water levels at the lower depth to <br />date. The specific reason for this drop was not apparent, although many historical boreholes and some faulting <br />exists in this general vicinity. Water levels in 2015 were similar to the previous water years. TDS values for <br />FBR-2-E (Figure 23) dropped in 2001, rebounded back to historical values, and began dropping again in 2003 <br />through 2015. 2011 exhibited an historic low TDS of 380 mg/l. The exact reason for this decline is unknown, <br />and does not appear to correspond with stable water levels. The TDS value rebounded significantly in 2014, only <br />to drop again in 2015 (Figure 23). The reason for these jumps is unknown, but TC will continue to monitor and <br />assess it. <br />Well 97013TC (Figure 24) water levels remained consistent from 2004 through 2010. A drop in water level <br />occurred in mid 2010, which is the result of being mined through. The water level continued to drop during <br />2015. TDS values for well 97013TC (Figure 25) were within historic values from 1997 through 2012, with <br />drops in 2013 and 2014. This also appears to be related to the well having been mined through. In 2015 TDS <br />concentrations rose. <br />Fish Creek Sandstone: Two Fish Creek Sandstone wells (91M001 and 91M004) require monitoring on a <br />semiannual basis for water level only. An additional well (Ashley) requires semi-annual monitoring for water <br />levels and field parameters, and annual water quality sampling. Tables 15 through 17 provide summaries of the <br />2006 Water Year data collected at each site. Tables 15a through 17a provide historical statistical summaries of <br />collected data at each site. Figure 26 provides graphical representation of the period of record water levels <br />measured at sites 91MOO 1 and 91M004. 91M004 has been dry the last two years. <br />Water levels at the Ashley well (Figure 27) dropped appreciably after subsidence in 1998, but afterward began to <br />recover in 1999. Seasonal changes in water levels have been evident, although water levels have appeared close <br />to the same levels from 2005 through 2015. TDS values at the Ashley well (Figure 28) have exhibited a general <br />decline since 1996, rose somewhat in 2005, and generally exhibited a dropped again in 2011 through 2013. <br />Levels appeared stable the last two years. Field measurements and water quality parameters for the Ashley well <br />7 <br />
The URL can be used to link to this page
Your browser does not support the video tag.