01577Olson Walker N )ciates Architects
April 11, 1980
page 3
The results are presented in Figure S.
G. SLOPE STABILITY
Our over-all slope stability analysis indicated that the slope
is satisfactory and stable for the residential building developments.
At present, our analysis further indicated that the present site !
conditions are stable even for the loose soil zones noted near the
surfaces. However, in the process of site development, the drainage
control should be made to avoid a groundwater build-up behind the }
structures or erosion of any part of the site. The site development f r
resented in this report
should*be adhered to in the recommendations p.
7. RECO(l,MENDATIONS i
{;t
[ J
Recommendations have been formulated from visual, as well as physical F.
ns of the existing site conditions. The
and analytical consideratio
following recommendations are believed to be pertinent. for the
envisaged project.
7.1. SITE PREPAR,4TION
1 'n paved
Site preparation should include the removal of all topsoi i
or graded areas and building locations. The resulting organic
debris and soils should be removed from the site or disposed of away #
from the developed area. No soils are allowed to push over the creek bank. 3
Site stripping should be accomplished in paved areas, building {
locations, and borrow areas for the structural fill. The average
depths of stripping in all areas should include the forest
' topsoil, which extends approximately 0.5 foot below the surface. ,
The underlying brown, loose, organic sandy silt, which is softened
by root action and weathering, should also be removed in paved areas, 1
' and in structural fill locations.
�
Following the stripping operations, the area to receive structural
}
fill or paved areas, should be pre -rolled with a 10-ton-roller to
achieve a non -yielding compact surface.
Soft areas which are evident during the pre -rolling should be
over -excavated to firm, stable soils, and replaced with structural
fill according to the compaction standard recommended in this report.
Areas of slight or moderately yielding surfaces should be allowed
drying, and be re -compacted to a dense, non -yielding state. The