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REP14684
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REP14684
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Entry Properties
Last modified
8/24/2016 11:44:29 PM
Creation date
11/27/2007 1:29:28 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1982056
IBM Index Class Name
Report
Doc Date
8/21/1996
Doc Name
1995 AHR Review
From
DMG
To
Twentymile Coal Company
Annual Report Year
1995
Permit Index Doc Type
HYDROLOGY REPORT
Media Type
D
Archive
No
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2. Drawdowns of approximately 6o feet may have occurred in <br />the Twentymile sandstone at the location of well 91M0o5. <br />No discernable changes in water level are noted at this <br />time in well 006-BRDH7. No significant water quality <br />changes are apparent from data collected at these wells. <br />1995 comments <br />2. A marked increase in two Twentymile sandstone wells was <br />noted. Recharge due to heavy spring rainfall was evident <br />in both BRDH-7 and 91M005, with a 40-foot and 100 foot <br />rise, respectively, in water level. Water quality <br />changes are not apparent. <br />1994 comments <br />3. The Trout Creek sandstone wells reveal water level <br />changes due to pumping by the mine or mining itself. <br />Page 2.05-111 of the approved permit require that Trout <br />Creek wells in the vicinity of the mine be monitored if <br />the sandstone shows impacts due to mining. The Division <br />reminded TCC of this commitment in a letter dated <br />'•11/25/94 after review of the 1993 AHR. Please submit <br />data collected to-date for the wells in the vicinity. <br />1995 comments <br />3. Once again, the Division reminds TCC of the permit <br />commitment to monitor Trout Creek sandstone wells in the <br />vicinity of the mine, should inflows into the mine occur <br />from this unit. AHR text states " Well 006-83-48C <br />exhibited a fairly steady decline prior to being <br />undermined during 1993..." This statement would imply <br />that mining itself does, in-fact, cause some dewatering <br />of the Trout Creek sandstone and would trigger the <br />commitment to monitor wells in the region. <br />1994 comments <br />4. Data appears to indicate a 20 foot decline in Fish Creek <br />sandstone well 91-MO04 since the fall of 1993. Does this <br />decline correspond to undermining during 1994? <br />1995 comments <br />4. Both 91M001 and 91M004 continue to exhibit depressed <br />water levels from baseline conditions. <br />Alluvial Wells <br />1994 comment - <br />1. The conductivity in well 001-5-5 has exceeded 2000 <br />umhos/cm for the first time (twice) since monitoring <br />
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