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REP47152
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REP47152
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Last modified
8/25/2016 12:50:39 AM
Creation date
11/27/2007 11:41:20 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1982056
IBM Index Class Name
Report
Doc Date
3/20/1995
Doc Name
2ND HALF 1994 SUBSIDENCE SURVEY REPORT PART 1
Permit Index Doc Type
SUBSIDENCE REPORT
Media Type
D
Archive
No
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• IV. Fish Creek AVF <br />No survey monument data was generated during the period with the exception of the <br />baseline coordinates for the 5000 series established in December. Hydrologic data <br />collection occurred as required and results are provided in this report. With the <br />submittal of this information, the Fish Creek AVF Hydrologic Monitoring program is <br />concluded as undermining of the area occurred in September 1993 and subsequent <br />monitoring has continued for one year since that time. <br />Hydrologic monitoring data for the period is presented as Tables ]through 60. No new <br />impacts were evident with regard to water levels or flow rates throughout the reporting <br />period. Water levels in wells GWB-1 and GWB-2R fluctuated slightly during the period <br />and to date remain slightly lower than pre-mining elevations. Total recoverable selenium <br />values for sites GWA-1, GWA-2, andGWA-6 are noted to be higher during the reporting <br />period. Elevated dissolved and total recoverable selenium values are noted for site <br />GWA-9. <br />As noted in the First Half 1994 Subsidence Report, three Fish Creek AVF hydrology <br />monitoring sites (GWA-b, GWAP-7, and GWB-2R) lie in areas which have been <br />subsided by Twentymile's mining operation. Site GWB-2R replaced well GWB-2 which <br />was destroyed in the subsidence process. <br />• No vegetation data was generated during the period as this aspect of the study was <br />completed. Results are summarized in the First Half 1994 Subsidence Report. <br />V. Conclusions <br />Subsidence monuments revealed no unusual developments throughout the reporting <br />period. Subsidence magnitudes were within the ranges previously documented for [he <br />area. <br />Structures remained essentially unaffected during the period. Minor impacts to the road <br />were evident but the road remained in good condition both during and after [he <br />subsidence process. No impacts whatsoever were evident to the power line. <br />No material damage was evidenced during the reporting period. <br />• <br />
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