REVIEWED REVISION BLD2022-0766+Geotechnical_Report+6.14.2023_4.51.04_PM+3610288............................................
BY
CITY OF EDMONDS
REVISION
BLD2022-0766 Jun 152023
Group Northwest, Inc.
Geotedhnical Enginea-s, Geologists, &
Environmental Scientists
13705 Bel -Red Rd
Phone 425-649-8757
...................................... � I E L D REPORT
Job # I Date I Page # I Field Report #
G-5650
Bellevue, WA 98005
Fax 425-649-8758 Permit Number:
6/5/2023 1 1 of 1 1
1214 11th PI N, Edmonds, WA
Travel & Time on Site:
BLD2022-0766 19:45 AM to 12:15 PM
Andrew Hoff, a geologsit with GEO Group Northwest, Inc., visited the site to observe the condition of the
proposed retaining wall's subgrade, and observe the condition of the retaining wall's cut slope. During our
visit, weather consisted of clear skies with temperatures in the low 70s F.
Retaining Wall Subgrade Observations:
While onsite, we observed the contractor had excavated an approximately 5 feet wide by 3.5 feet deep by 70
feet long keyway for the proposed retaining wall. We observed excavated soils had been hauled off site. We
observed the proposed retaining wall's subgrade soils to consist of brownish gray gravelly sand and poorly
graded sand, consistent with our subsurface investigation. We used a 1/2" diameter T-probe to probe the
retaining wall's subgrade and observed firm, dense, and unyielding conditions in areas probed, considered
suitable for supporting the proposed retaining wall for the northern approximately 65 feet of the keyway.
We observed loose soils near the southern extent of the keyway (near an abandoned sewer pipe), and
recommend that the area be over -excavated an additional I foot, and backfilled with clean crushed rock
(minimum 5/8", maximum 1 1/4" clast size).
Retaining Wall Cut Slope Observations:
We observed the over -steepened cut slope behind the proposed retaining wall consisted of an approximately
4 to 6 feet tall near vertical cut and was sloped at an approximately 1 H:1 V inclination above the vertical
cut. We observed the sloped area was undisturbed, and vegetated with ivy groundcover and bushes. We did
not observe any evidence of slope instability or sloughing during our site vist.
A representative of GEO Group Northwest, Inc. will return when requested.
Andrew Hoff, G.I.T.
Staff Geologist
Copy to: Owner - Mr. Howard Chermak
Office File
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