2008-04-30_REPORT - M1973021 ‎(3)‎

• Permit No: M1973021
• IBM Index Class Name: REPORT
• Doc Date: 4/30/2008
• Doc Name: Geotechnical Addendum/ 2007 Annual Report
• From: Tetra Tech
• To: DRMS
• Permit Index Doc Type: Annual Reclamation Report
• Media Type: D
• Archive: No

Discontinuity
Set 1
Very Low (6) <1 m (<3.3 ft)
Low (4) 1-3m(3.3-9.9ft)
Medium (2) 3 - 10 m (9.9 - 33 ft) < 25 ft
High (1) 10 - 20 m (33 - 66 ft)
Very High (0) >20 m (>66 ft)
Set 2 Set 3 Set 4 Set 5 Set 3 has less persistence due to folding
Notes: and changes in orientation of the horizontal
set
<25ft 3-20ft
Discontinuity Separation (Aperture)

Very Tight Joints (6) Set 1 Set 2 Set 3 Set 4 Set 5
<0.1 mm (< 0.003 in) <0.003 in < 0.003 in
Tight Joints (5) 0.1 - 0.5 mm (0.003 - 0.02 in)
Moderately Open Joints (4 0.5 - 2.5 mm (0.02 - 0.1 in)
Open Joints (1) 2.5 - 10 mm (0.1 - 0.4 in) 0.1 - 0.4 in
V~Wide Aperture (0) >10 mm (> 0 4 in)
Discontinuity
Set 1
Very Rough Surfaces (6) VR
Rough Surfaces (5) R
Slightly Rough Surfaces (3 SR SR
Smooth Surfaces (1) SM
Slickensided Surfaces (0) SL
ess
Set 2 Set 3 Set 4 Set 5
Notes:
SR Set 3 displays undulation through the joint
SM set from folding trending approximately north
to south
Discontinuity Filling (Gouge)
Set 1 Set 2 Set 3 Set 4 Set 5
~e clay, staining, shear, etc none (6) Slight clay (2) none (6)
ckness up to 0.2 in
imated Compressive Strength
;page none, moist dripping etc none none none
Discontinuity Wall Face Weathering
Set 1 Set 2 Set 3 Set 4 Set 5
Unweathered (6) UW
Slightly Weathered (5) SW SW SW
Moderately Weathered (3) MW MW
Highly Weathered (1) HW
Completely Weathered (0) CW
Residual Soil 0 RS
RMR Classification: Fair to Good Rock (58 - 69)
Additional Notes: Rock is granitic gneiss or biotite gneiss with occasional pegmatitic intrusions. A highly weathered shear zone
consisting of biotite schist is present from highwall stations 4+10 to 5+60. The highwall displays gentle horizontal
folding.