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STREET G ram i awymp Go Consulting
Robert M. Pride, LLC Engineer
October 31, 2oo6
Mr. Jon K'vernmo
Hillcrest Construction
P. O. Box 3121
Everett, WA 98213-1121
Re: Iteport on WaH Inspection
Single Family Residence
17007 77 1h Place West — Lot 3
Edmonds, Washington
RMP Project No. 05-125-01
Dear Mr. Kvermno,
At your request and as requested by the City of Edmonds, this letter summarizes my
field inspection of the block retaining wall located on Lot #3 at 17007 77th Place West. It
is understood that a separate permit will be required to cover this wall construction due
to its location within the Edmonds Critical Area.
A site inspection was performed to document existing wall conditions, and to confirm
the adequacy of foundation conditions for support of this interlocking block retaining
wall. The block wall was constructed along the north side of the residence adjacent to
the north property line. Maximum height of this wall is four feet, except where the east
and west ends of the wall drop to about one foot in height. A plan will be submitted
showing the wall location with top and toe elevations.
Based on my previous site inspections during excavation for the building pad, this
portion of the wall was placed on competent native soils. Each layer of interlocking
block is off -set one inch with a total of about 6 to 7 inches of back slope into the final
compacted backfill. Drain gravel was placed behind the base of this wall.
Based on my recent site inspection this wall is approved as constructed. Stability
calculations for this four foot high wall show that it has a factor of safety of 1.3 against
overturning. Please call me if there are any questions.
Re,pectfully,-,-
Robert M. Pride, P. E.
Principal Geotechnical
dist: (2) addressee
ring: HillerestWaIDA3
13203
Phone: 425-814-3970
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AP
WA 98034
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Fax: 425-814-5672