HomeMy WebLinkAboutBLD1987-00388 Geo Tech NORTHWESTERN TERRITORIES, INC.
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NTI
Clark Associates
EVALUATION OF HOMESITE NEAR A BLUFF
IN JEFFERSON COUNTY
Prepared for
DAVID RUGH
Owner
Prepared By
CLARK ASSOCIATES , A Division of
NORTHWESTERN TERRITORIES , INC .
ID
July , 1987
717 SOUTH PEABODY, PORT ANGELES, WA 98362 (206) 452-8491 1-800-654-5545
EVALUATION OF HOMESITE NEAR A BLUFF
IN JEFFERSON COUNTY , WASHINGTON
For
David Rugh
July, 1987
GENERAL
On July 16 , 1987 , Norman A. Dixon of Clark Associates , A
Division of Northwestern Territories , Inc . , made an engineering
and geological evaluation of a homesite near a bluff in
northeastern Jefferson County , about half way between the towns
of Quilcene and Chimacum (Section 5 , Township 27 North, Range 1
West , W. M. , Jefferson County , Washington. The more precise
location of this property is shown on the enclosed map provided
by the owner David J. Rugh . Mr . Rugh is interested in building
a home at the location indicated on the map, which is adjacent
to the south bank of Canyon Stream.
SITE DESCRIPTION
The homesite is situated in a forest setting , and just at the
top of the slope of the south bank of Canyon Stream, as shown
in the accompanying photographs , where a former log structure
has been partially completed . The planned residence will
occupy approximately the same location as the log structure ,
but will be 60 feet long and 25 feet in width, with the long
dimension of the house parallelling the bank edge .
The valley walls of Canyon Stream, which is about 75 feet deep,
are inclined at about 32" at the home site, which is just about
the long term stable angle of repose for the sand subsoils
existing throughout this area. Furthermore , these slopes are
everywhere heavily vegetated and covered by many trees , all of
which tend to prevent surface erosion, due to the soil
reinforcing effect of the extensive root systems .
No evidence of recent slope movements could be observed , and
most of the tree trunks on the banks were observed to be
straight , not bent downslope, near their bases .
CONCLUSIONS AND RECOMMENDATIONS
1 . The sideslopes of Canyon Stream in the vicinity of the Rugh
homesite have been stable for some time , and will continue
to remain stable provided:
a. the existing vegetation and tree cover are not
disturbed; and
b . all future surface water is directed away from the
bluff edge .
2 . It is recommended that the nearest house footing be placed
no closer than 10 feet from the bluff edge .
3 . Once approximately two feet of topsoil has been removed,
the native undisturbed sand stratum should be fully capable
of supporting footing loads of up to 2 , 500 pounds per
square foot .
STANDARD DISCLOSURE STATEMENT
This report is based on a limited budget . Only visual
inspection of the existing site conditions and/or facility was
conducted . No scientific measurements , tests or calculations
were performed . The findings and report are limited to the
normal standard of care of the industry for a limited budget
investigation without benefit of scientific data and
calculations . Unless foundation plans are reviewed and the
construction work is inspected by the Engineer, no warranty is
made by the Engineer concerning conformity of the construction
to the conclusions and recommendations of this report .
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= � Norman A . Dixon PEG
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0 - T. Engineering Geologist
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J . R . Jerry Newlin, PE
E „•'D' Principal Engineer
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Photograph 1 Photograph 2
Photographs show homesite location at approximate site of partially completed log
structure. Note heavy forest and protective vegetative cover along the south bank of
Canyon Stream.