CANOD.pdfeetechnicc►l Engineering eynct F_ Girth .Sciences
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°M M Y OF
October 26, 2015
Mr. Greg Jacobsen
c/o Krannitz Gehl Architects
765 NE Northlake Way
Seattle, WA 98105
SUBJECT: SUPPLEMENTAL EVALUATIONS
Proposed West Yard Fencing
741 Hanna Park Road
Edmonds, Washington
Project No. 13-133-01
Dear Greg,
In accordance with a request from Bryan Krannitz, this is to confirm our evaluations and
recommendations regarding the siting of the subject proposed fencing as shown on the
attached Figure 1. We have previously prepared a geotechnical evaluation report
dated December 4, 2013 for your new residence.
P.O. Box 276, Issaquah, WA 98027-0276 • Phone: (425) 397-4228 Fd,)c (425) 397-4228
Jacobsen . October 26, 2015
SUPPLEMENTAL EVALUATIONS AND RECOMMENDATIONS
The existing bluff slope that borders the west side of the site is considered to be a
Landslide Hazard Area based upon its height and very steep inclination per the criteria
presented in 23.80.020 B of the Edmonds code.
Based upon our previous site observations and shallow explorations and review of the
geologic map, the bluff is composed of very dense/hard glacially consolidated soils.
Our previous observations of the existing bluff slope surface and the area above the
slope revealed no evidence of deep seated instability of the slope on the site or on the
adjacent properties but we did observe evidence of previous of shallow instability in the
southern portion of the slope.
We previously recommended a variable slope buffer that ranged from about 17 feet to
23 feet from the top of slope due to variations in the top of slope location but averaged
about 20 feet plus a normal 15 foot setback for siting your new residence per the
development standards of section 23.80.070 of the Edmonds code.
The proposed west yard fencing is shown in Figure 1. The fencing will run along the
north and south property boundaries and will extend into the steep slope buffer. In our
opinion the proposed fencing shown in Figure 1 will not adversely impact the critical
area and will not increase the threat of geological hazard to adjacent properties beyond
pre -development conditions provided that our supplemental recommendations
presented below are followed.
We recommend that the proposed fencing within the buffer be performed per the
following conditions:
o Fence posts within 10 feet of the top of the steep slope should be embedded a
minimum of 3 feet and a minimum of 2 feet into very dense/very stiff natural
soils whichever is greater.
o No fence posts should be located closer than 2 feet from the top of the steep
slope.
o All excavated material from post hole excavations should be removed from the
slope buffer area and the buffer area should remain undisturbed except as
required for the fence construction.
o Disturbed areas should be re -vegetated immediately.
Project No. 13-133-01 Page 2
Jacobsen
CLOSURE
October 26, 2015
This letter was prepared with the skill and care ordinarily exercised by local members of
the geotechnical profession practicing under similar conditions in the same locality.
We make no other warranty, either express or implied.
Variations may exist in site conditions between those described in our previous report
and actual conditions encountered during construction. Unanticipated subsurface
conditions commonly occur and cannot be prevented by performing reconnaissance or
explorations. Such unexpected conditions frequently require additional expenditures to
achieve a properly constructed project. If conditions encountered during construction
appear to be different from those indicated in our previous report, our office should be
notified.
Sincerely,
GEOSPECTRUM CONSULTANTS, INC..
w
James A. DooIH
Principal Engineer
Attachment: Figure 1
dist: 1/Addressee
Project No. 13-133-01
Page 3
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ref: Jacobsen Residence Fence Plot Plan,
prepared by Krannitz Gehl Architects,
dated 10/14/2015, Reduced Scale: 1"=30' PROPOSED FENCE PLAN
Proposed Residence Replacement
GEOSPECTRIUM CONSULTANTS, INC. 741 Hanna_ Park Road
t's'r ri Edmonds, Washington
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