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REP48338
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REP48338
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Last modified
8/25/2016 12:52:01 AM
Creation date
11/27/2007 12:17:57 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1982056
IBM Index Class Name
Report
Doc Date
12/11/2001
Doc Name
1ST HALF 1994 FISH CREEK ALLUVIAL VALLEY FLOOR STUDY AREA 1ST HALF 1994
Permit Index Doc Type
SUBSIDENCE REPORT
Media Type
D
Archive
No
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parameters. <br />Well GWAP7, like the above well, started subsiding during October, <br />1993 and by year's end the well had subsided a total of 2.2 feet. <br />During the first half of 1994 the well subsided an additional 0.1 <br />foot. The water levels recorded for this well appear to reflect <br />the fact that the well has subsided but do not indicate that <br />dewatering of the alluvium has occurred. The water level in the <br />well appears to have stabilized since first being subsided. <br />Well GWB-2R, did not show any further subsidence effects during the <br />first half of 1994. Well GWB-2, which well GWB-2R replaced, at the <br />time of initial completion showed the water level was above ground <br />elevation. However, during the mining process the shallow sandstone <br />was dewatered and the water level as of December 30, 1993 was <br />measured at 35.8 feet below the measuring point. During the first <br />half of 1994 the water level has been increasing and is approaching <br />premine conditions, indicating the well is recovering. <br />Well GWB1, like wells GWB2 and GWB2R, is also completed in the <br />shallow sandstone. This well is located outside of the subsided <br />area and is showing signs of recovering to premine levels. The <br />water quality data does not appear to have been impacted by the <br />sandstone unit subsiding. <br />3.0 STATION ELEVATION SURVEYS <br />• Tables 52 through 56 provide the hydrologic monitoring station <br />elevation data collected during the period of January 3, 1994 <br />through December 31, 1993. The July 22, 1993 data is used as the <br />baseline elevation for the various sites, except as noted on table <br />2. This date was chosen due to the fact that mining activities <br />have not previously impacted any of the stations established along <br />Fish Creek and in its valley floor, and that mining of panel 6 <br />would begin in September, 1993. The approved mining plan indicates <br />that panel 6 would have the greatest potential of subsiding Fish <br />Creek and its valley floor. <br />The survey data gathered during this time period showed that the <br />following sites were subsided: GWA6, GWAP7 and GWB2. All of these <br />wells showed that they have begun subsiding when they were surveyed <br />on October 18, 1993. The extent of subsidence varied from 1 to 2.4 <br />feet. The remainder of the stations did not experience any <br />significant subsidence. Station GWAP5 appears to warrant further <br />review as the data indicates the well's measuring point is rising <br />as opposed to subsiding. This may well be a survey error. <br />4.0 CHANNEL PROFILE <br />The Fish Creek channel was surveyed twice during the first half of <br />1994. A review of the sections and profiles does not indicated any <br />major impacts due to undermining and subsiding the creek. The <br />sections and profile do not show any significant difference from <br />the prior surveys. Visual observations of the channel, bank and <br />
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