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2010-02-02_REPORT - M1973021 (2)
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2010-02-02_REPORT - M1973021 (2)
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Last modified
8/24/2016 3:59:14 PM
Creation date
2/4/2010 7:26:03 AM
Metadata
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Template:
DRMS Permit Index
Permit No
M1973021
IBM Index Class Name
REPORT
Doc Date
2/2/2010
Doc Name
Geotechnical Addendum- 2009 Annual Report
From
Aggregate Industries-WCR, Inc.
To
DRMS
Permit Index Doc Type
Annual Fee/Report
Email Name
DB2
Media Type
D
Archive
No
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the field investigation, the quarry was approximately one-third filled. Figure 4 is a photo <br />of the fill placed in 2009. <br />3.3 South Quarry <br />Geotechnical data was collected for the areas mined in 2009. These areas include four <br />highwall and bench combinations at elevations 6880, 6820, 6760, and 6700 as <br />approximately shown on Figure 5. Bench development is complete at elevation 6880, with <br />minor development on 6820. Bench development is on-going at bench elevation 6760 and <br />6700. The highwall faces are referred to by elevation for reference in this report. The <br />benches represent an increased depth of mining in the South Quarry from last year and <br />include expanded mining areas to the east and west (east facing). <br />The type of rock encountered in the highwalls is consistent with rock types described in <br />previous geotechnical addenda and primarily consists of fine to medium grained granitic <br />gneiss or biotite gneiss. Occasional pegmatitic intrusions, biotite schist zones and shear <br />zones are also present in the area. <br />Gneiss observed in the highwalls is slightly to moderately weathered and generally <br />displays two prominent joint sets and a foliation surface. Joint spacing ranges from <br />approximately 2 inches up to 7 feet. Joint surfaces generally are slightly rough to rough <br />and are usually closed. When joint surfaces are open or exposed, the joint faces are <br />typically slightly to moderately weathered with iron staining. With the exception of <br />localized areas, the joints generally do not contain infill material. <br />Foliation plane spacing ranges from less than one inch up to 6 feet. Foliation surfaces <br />generally are smooth to rough and are usually closed. When foliation surfaces are open or <br />exposed, the aperture is up to one tenth of an inch and the foliation faces are typically <br />slightly weathered with iron staining. The foliation generally does not contain infill <br />material. The highwalls observed were dry and seepage through the rock at the upper <br />elevations is not anticipated. Average RMR values calculated for the rock exposed in the <br />highwalls of the South Quarry range from 45 to 77 indicating fair to good rock. Joint <br />orientation field data and RMR spreadsheets for the highwalls are included in Appendix A. <br />Scanline descriptions are included below: <br />The Bench 6880 scanline was continued from the Scanline conducted on this bench for the <br />2008 annual report (starting at station 4+00). The continued scanline is approximately 275 <br />feet long and was separated into 2 discrete sections. The approximate orientation of the <br />highwall is 340 degrees (north 20 degrees west). <br />Stations 4+00 through 4+75 consisted of granitic gneiss. The foliation strike <br />varies in this area due to minor folding and ranges from 305 to 340 degrees. <br />Foliation dips were 15 to 40 degrees southwest, parallel or slightly into the <br />highwall, with average spacing of approximately 4 inches and foliation <br />apertures were closed and smooth. The primary joint set strike ranges from 120 <br />to 150 degrees and generally dips from 45 to 90 degrees northeast, out of the <br />-4- <br />Morrison Quarry Annual Report 2009 February 2010 <br />P:\23514\1 33-23514-10003\Deliverables\Deliv-01 -Annual Report\Annual_Report_2009_Geotech, 1-25-10.doc
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