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REP09159
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Last modified
8/24/2016 11:38:51 PM
Creation date
11/27/2007 12:03:40 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1980005
IBM Index Class Name
Report
Doc Date
12/11/2001
Doc Name
1992 WATER YEAR ANNUAL HYDROLOGY REPORT SENECA II MINE
Annual Report Year
1992
Permit Index Doc Type
HYDROLOGY REPORT
Media Type
D
Archive
No
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• Water level reports for each well are presented immediately after the water level <br />hydrograph for each respective well in the same appendix. gy presenting twelve years <br />worth of data, trends related to seasonal end annual variability and possible mining <br />related impacts are more clearly evident. Table 3 (Summary of Ground Water Monitoring <br />Yells, Appendix A), is presented as a reference for the reader. No new wells were drifted <br />in 1992. Water level measurements obtained in non-flowing wells are taken with either a <br />Soil Test M-scope, a Slope Indicator Water Level Indicator, or in the case of a feu <br />shallow alluvial wells, directly from a steel tape. Pressure readings (in psi) obtained <br />from flowing wells with pressure gages ere multiplied by 2.31 to obtain head in feet. <br />For the sake of brevity, the GW-S prefix that precedes ell well names will be dropped <br />throughout this report. As an example, Well GY-546-A will be referred to as Yell 46-A. <br />Alluvium. The alluvial monitoring wells are located along Cow Camp (Wells 46-A and 69-A), <br />Bond (Well 68-A), Grassy (Wells 33-A and 34-A), and Little Grassy Creeks (Wells 6-A, <br />31-A1, 31-A2, and 32-A). These wells exhibit seasonal fluctuations in water levels. The <br />spring runoff-infiltration stimulates a water level rise, end as the drier fall season <br />• approaches, water levels decline. Generally, late summer water levels were shaLlouer this <br />year due to an increase in summer precipitation from previous years. <br />Lennox Overburden/Lennox-Wedge Lnterburden. Wells completed in these formations exhibit <br />normal seasonal variations, that is, lowest water levels in the fall and uinte r, and <br />highest in the late spring/early summer after the spring runoff recharge event. Well <br />42P1-LWI has shown a decline in water levels since August 1985 due to dewatering from an <br />adjacent mine pit. A slight increase in water levels, however, has been noted since 1989. <br />Yell 42P2-LO has shown a slight increase in ueter levels over the pest years up to the end <br />of 1988, due likely to the stripping of adjacent overburden material with a resulting <br />increase in the recharge area. The dramatic increase in water levels (approximately 30 <br />feet) for Well 42P 2-LO in 1989, along with the smaller increase noted earlier at adjacent <br />Well 42P1-LW1, were likely due to beckfilling of the adjacent mine pit performed in the <br />fall of 1989. The highwall side of this pit was dozed and graded to fill in the pit and <br /> reduce the height of the highwall. This regrading cut into the Lennox overburden and <br /> Lennox-Wedge interburden, thereby inc reasing the available area for potenti al recharge to <br /> these formations. The resaturation of spoils in the beckfilled pit may have also <br />• contributed to the increase in water levels. Yells 21-LWI end 41-LWI both exhibit normal <br /> seasonal variations. <br />3 <br />
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