FEB 7, 2018 RESUB GEOTECH LETTER.pdfRobert M. Pride LLC Consulting Engineer
January 22, 2oi8
Mr. Joe Lucia, P. E.
Structural Engineer
7307 12th Avenue NE
Seattle, WA 98115
Re: Geotechnical Plan Review
Proposed Residence — Lots i and 2
18109/111 84th Avenue West
Edmonds Washington
Permit #BLD2017017
Dear Mr. Lucia,
This report confirms that I have reviewed the final structural plans for the two proposed
residences on Lots 1 and 2 located on the east side of 84th Avenue East in Edmonds.
These plans were based on our geotechnical recommendations provided in report, and
the structural plans dated November 2017 were prepared by Lucia Engineering.
Temporary slope cuts will be made with the upper sections excavated down at a 1H:1V
slope and then vertical below. These slope cuts will expose dense glacial outwash soils
that consist of silty sands and gravel that will stand without instability during
construction of these two residences. Evaluation of the slope stability for these
temporary slope cuts shows they will have a factor of safety in excess of 1.5 for static and
1.2 for seismic conditions, and will provide construction safety during installation of the
adjacent foundations and retaining walls. It is recommended that these slopes be
covered with heavy plastic sheeting for protection during the wet season months.
As requested by the city of Edmonds these temporary slope cuts will not adversely
impact the adjacent residential structure or other nearby critical areas. In my opinion
there will not be any hazards created that will be in excess of the existing pre -
development conditions.
Locations of the two structures on Lots 1 and 2 will have a sufficient setback from steep
slopes and there will; be no risk for landslide development or risk to these new
residential structures. No steep slopes will exist upon completion of these residences
when final retaining wall backfill has been properly placed and compacted. in A
minimum ten foot buffer should be acceptable for structure protection where any steep
slopes exist upon final site grading.
On the basis of my final plan review of the Lucia drawings for this project, they are
satisfactory from a geotechnical point of view, and they are in accordance with our
recommendations in our November 10, 2017 report. We will provide the required
Robert M. Pride, LLC Page 1
13203 Holmes Point Drive NE Kirkland, WA 98034
geotechnical inspections as required by the city of Edmonds, and appropriate field
memos will be prepared for submittal to the city.
Please call me if there are any questions.
Respectfully,
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Robert M. Pride, P. E.
Principal Geotechnical Engineer
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Robert M. Pride, LLC Page 2
13203 Holmes Point Drive NE Kirkland, WA 98034