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REP44429
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REP44429
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Entry Properties
Last modified
8/25/2016 12:46:50 AM
Creation date
11/27/2007 10:16:59 AM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1974004
IBM Index Class Name
Report
Doc Date
5/14/2002
Doc Name
Annual Strucutural Analysis Report
From
Mobile Premix Concrete Inc.
To
DMG
Media Type
D
Archive
No
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' 1) Significant mining progress has occurred in both the main pit and upper <br />' level since the previous annual report was prepared. Mining appears to <br />have advanced one bench level on the entire upper level. The start of the <br />t next lower bench for the upper level was evident adjacent to the haul road. <br />Exposed rock faces for the final walls of the upper level were present in the <br />' southwest comer and along the eastern portion of the south wall. Rock <br />exposures on advancing benches were also mapped for north, east, west, <br />' and south orientations on the upper level. <br />' For the main pit, it appeared that mining of the next bench was well <br />underway with mining progressing in a standard counterclockwise fashion. <br />' The area along the north wall had been mined and reclaimed and a <br />significant portion of the west wall had been mined and partially reclaimed. <br />Exposed rock faces for the final walls were present along the west wall of <br />' the new level. Rock exposures on advancing benches were also mapped <br />for south and east faces on the new level. <br />2) The quarry walls appeared to be relatively dry indicating the absence of <br />significant hydrostatic pressures that could influence pit stability. Noticeably <br />absent is any seepage in the southwest comer of the main pit, which had <br />been consistently documented in prior reports. <br />Two areas of groundwater infiltration/accumulation are currently visible. In <br />the southwest comer of the upper level, surface seepage was present <br />(Photo 1). At the time of our inspection, it was not apparent as to whether <br />the seepage was the result of surficial snowmelt, or runoff that accumulates <br />in the minor valley depression beyond the quarry, or groundwater infiltration <br />conveyed by permeable discontinuities. The other area of visible <br />groundwater is in the northeast corner of the main pit where the sump is <br />located (Photo 2). At the time of inspection, no visible seepage into the <br />2002 Spec-Agg Annual Report Page 7 <br />
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