20190913_Geotech Letter.pdf
Cobalt Geosciences, LLC
P.O. Box 82243
Kenmore, Washington 98028
www.cobaltgeo.com (206) 331-1097
September 12, 2019
Mark Langford
C/O Brian Kalab
IECO
Brian@insightengineering.net
RE: Geotechnical Addendum
Proposed Short Plat
1736 Vista Place
Edmonds, Washington
We have prepared this letter to discuss the recommendation for a 10 foot effective setback for the
new residence.
In site areas that consist of sloping ground without distinct level building areas, it can become
necessary to deepen some of the foundation elements to create an effective building setback. The
attached figure shows an effective setback as recommended for the new residence at the
referenced site.
As shown, it will likely be necessary to embed the lower elevation footings to a dee per level in
order to create the 10 foot effective setback. The effective setback is the horizontal distance
measured from the outside edge of the bottom of footings to the face of the existing slope.
Let us know if you have any questions.
Sincerely,
Cobalt Geosciences, LLC
Exp. 6/26/2020
Phil Haberman, PE, LG, LEG
Principal
Cobalt Geosciences, LLC
P.O. Box 82243
Kenmore, WA 98028
(206) 331-1097
www.cobaltgeo.com
cobaltgeo@gmail.com
SETBACK
FIGURE 1
Proposed Two Lot Subdivision
1736 Vista Place
Edmonds, Washington
Min. 10’
EFFECTIVE SETBACK DETAIL
Existing/Finish Grades
Grade Prior to Excavation
Area of Residence
Effective setback is the horizontal distance measured from the outer edge of the footing
to the face of the closest slope. In order to achieve the minimum effective setback,
it may be necessary to deepen certain footings on the low side of the residence.
Deepen Footing as Needed to Achieve
Setback