My WebLink
|
Help
|
About
|
Sign Out
Home
Browse
Search
2012-01-27_REPORT - M1973021
DRMS
>
Day Forward
>
Report
>
Minerals
>
M1973021
>
2012-01-27_REPORT - M1973021
Metadata
Thumbnails
Annotations
Entry Properties
Last modified
8/24/2016 4:48:02 PM
Creation date
1/30/2012 1:14:47 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
M1973021
IBM Index Class Name
REPORT
Doc Date
1/27/2012
Doc Name
Annual Report and Geotechnical Addendum
From
Tetra Tech for AI
To
DRMS
Permit Index Doc Type
Annual Reclamation Report
Email Name
TAK
Media Type
D
Archive
No
There are no annotations on this page.
Document management portal powered by Laserfiche WebLink 9 © 1998-2015
Laserfiche.
All rights reserved.
/
49
PDF
Print
Pages to print
Enter page numbers and/or page ranges separated by commas. For example, 1,3,5-12.
After downloading, print the document using a PDF reader (e.g. Adobe Reader).
View images
View plain text
zones are also present in the area. A shear zone associated with a mapped fault (Scott, <br />1972) was observed on the north end of bench 6700. The shear zone consists of highly <br />weathered sillimanitic gneiss. Minor seepage has been observed emanating from a small <br />area near the shear zone. Otherwise, all observed highwall areas are dry. <br />The granitic and biotitic gneiss observed in the highwalls is typically slightly to moderately <br />weathered and locally fresh. The rock generally displays two prominent joint sets and a <br />foliation surface. Joint spacing ranges from approximately 2 inches up to 7 feet. Joint <br />surfaces generally are slightly rough to rough and are usually very tight to moderately <br />open. When joint surfaces are open or exposed, the joint faces are typically slightly to <br />moderately weathered with iron staining. With the exception of localized areas, the joints <br />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 slightly rough to very rough and are usually very tight to moderately open. <br />When foliation surfaces are open or exposed, the aperture is up to one tenth of an inch and <br />the foliation faces are typically slightly weathered with iron staining. The foliation <br />generally does not contain infill material. The highwalls observed were dry and seepage <br />through the rock at the upper elevations is not anticipated. Minor water infiltration was <br />observed at the toe of the highwall on bench 6700 between station 41 +70 and 51 +30. The <br />infiltration appears to be related to weak zones affected by the fault. <br />With the exception of the shear zone, average RMR values calculated for the rock exposed <br />in the highwalls of the South Quarry range from 25 to 59 indicating poor to fair rock. <br />The sillimanitic gneiss observed in the fault zone is typically moderately to highly <br />weathered. A band of weak rock parallels the fault zone. One overtopping instability has <br />occurred in the weak rock and is discussed below. No prominent joint sets are observable <br />and the foliation varies greatly. <br />Average RMR values calculated for rock within the weak rock associated with the fault <br />zone range from 9 to 28 indicating very poor to poor rock. Joint orientation field data and <br />RMR spreadsheets for the highwalls are included in Appendix A. Scanline descriptions <br />are included below. <br />Bench 7350 <br />The Bench 7350 scanline is approximately 346 feet long and was separated into 4 discrete <br />sections. The approximate orientation of the highwall varies between is 30 degrees (north <br />30 degrees east) and 325 degrees (north 35 degrees west). <br />• Stations 0 +00 through 0 +40 were unmappable due to overburden and rock <br />cover. It is assumed that the lower stations of this section of highwall are all <br />overburden and highly to completely weathered rock as evidenced by the <br />proximity to native topography. It is assumed that upstation the highwall <br />condition became similar to the scanline between stations 0 +40 and 2 +60. <br />- 4 - <br />Morrison Quarry Annual Report 2011 <br />P.\23514\ 133 - 23514- 12002\ Deliverables \Dehv -01- Annual Report \Annual_Report_2011_Geotech doc <br />January 2012 <br />
The URL can be used to link to this page
Your browser does not support the video tag.