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REP20755
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Entry Properties
Last modified
8/24/2016 11:49:16 PM
Creation date
11/27/2007 2:57:46 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980005
IBM Index Class Name
Report
Doc Date
3/2/1994
Doc Name
1993 WATER YEAR ANNUAL HYDROLOGY REPORT SENECA II MINE
Annual Report Year
1993
Permit Index Doc Type
HYDROLOGY REPORT
Media Type
D
Archive
No
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• levels since 1986 due to high snowpeck runoff. The one remaining well (42P2-LO) displayed <br />its highest water level since 1989. <br />Wadge Coal. Five wells monitor this seam. Wells 16-W and 17-W ere in hydraulic <br />communication with the Yadge Impoundment (NPDES 002 Pond) because [heir water levels <br />change in response to a change in the pond's water level. Yell 16-Y exhibited its highest <br />water Level ever, while 17-W exhibited its second highest water level ever. Yell 41-W <br />exhibits the same seasonal variations es noted for the alluvial aquifer and also exhibited <br />its highest water level on record. Yell 19-Y exhibited its highest water level since <br />1985, while Well 42-4 exhibited its highest water level since 1986. All high water levels <br />may be attributed to high snowpack runoff during 1993. <br />Wolf Creek Overburden/Wedge Underburden. Five wells (with a -U following the well number) <br />monitor the Wedge Underburden in the Wedge Coal mining area, while two wells (with a -WCO) <br />monitor the Wolf Creek Overburden in the Wolf Creek Coel mining area. Wells 2-U and 6-U <br />exhibit typical seasonal variation (as defined in the preceding Alluvium discussion), and <br />exhibited their highest water level since 1986. Well 11•U continues a long-term <br />• increasing water level trend with its highest water levels ever. Wells 8-U and 8P1-U <br />continue their long-term decreasing water level trend. Well 7-WCO exhibits very slight <br />(less than one foot) seasonal variability end long-term variability (3.50 feet since <br />1986), with the highest water levels since 1986 noted in 1993. Well 37-WCO exhibits <br />typical seasonal variability with a long-term decreasing water level trend. <br />Wolf Creek Coal. The five wells (10-WC, 14-WC, 15-NC, 35-WC, end 37-WC) that monitor the <br />Wolf Creek Coal seam all exhibit the same typical seasonal variability as previously <br />defined. All five wells had their highest water levels compared to the past several years <br />(ranging from 1986 for Welt 35-WC to 1991 for WeLI 14 -WC). <br />Spoils. Three wells, 22-5, 23.5, end 24-5 are completed in the upper region of spoils <br />(above the Wadge Impoundment) which is generally unsaturated. Yell 23-5 sometimes shows <br />water in late February, Narch, and April as snow melts quickly off this westerly facing <br />slope. Welt 24-5 has ~heen dry for the entire period of record. The 3.8 feet of <br />saturation observed in 4ell 22-5 is most likely incorrect since adjacent Wells 23-5 and <br />24-5 ere normally dry. The suspect water levels in Vell 22-5 may be a result of water <br />. trapped in the borehole (perhaps by a boulder in the spoils that the borehole does not <br />completely penetrate). <br />3 <br />
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