REP02129

• Permit No: C1980007
• IBM Index Class Name: Report
• Doc Date: 11/1/1980
• Doc Name: Landslide Study
• From: Geo-Hydro Consultants
• Permit Index Doc Type: STABILITY REPORT
• Media Type: D
• Archive: No

' i. -8-
j accurate data on the ground water fluctuation.
' I 3.0 CONSTRUCTION CONDITIONS AND DESIGN RECOMMENDATIONS
I
" 3.1 GENERAL APPROACH
!~
I

' i It was concluded during our previous phases of work that
h
i
f
h
t
e ex
stence o
t
e landslides at the site will influence the
construction; from a geotechnical point of view it would be
' preferable to relocate the proposed surficial structures and
facilities outside the area of landslides. As this is apparent-
ly not feasible, it is necessary to design and construct the
proposed facilities so that the old slide deformations are not
renewed or new slides or deformations are not initiated.
~ As recommended earlier in our previous report, placement
' of large fills or excavating large cuts at improper locations
~, should be avoided; drainage patterns should not be deteriorated;
high cuts or cuts at critical locations should be supported.
Foundations of structures within the slide area should be
designed so that they do not decrease the stability.
~
.
' I
~ As has become evident during the previous phases of our in-
vestigation, ground water conditions have an important impact
on the stability of the area. It is very probable that most of
' the landslides which are present in the area developed during the
i periods when the ground water levels were high and soils and
~; .rocks were saturated. As discussed earlier in this report,
' experience from last spring confirms this conclusion: the steep
slope close to the proposed mine bench became saturated and a
~ slide developed as a result of a very minor excavation for one
' i of the drilling pads. Several other slides documented in our
i Pro
ss Re
ort develo
ed on other locations durin
the last
r
g
g
p
p
e

~«.o.o~..a..~