#1_LAI Sharma Residence Site Stabilization Field Report 06-5-2020_SMGLANDAU
1AASSOCIATES
Field Report
Project No.: 0074203.050.051 Report No.: 1
Client/Owner: City of Edmonds/Amit Sharma
Project Name: Sharma Residence Site Stabilization
Location: 15712 72" d Ave West, Edmonds, Washington
Weather Conditions: Cloudy, low 60s (F)
Prepared By: Sean Gertz
Date: 6/5/2020
Reviewed By: Steve Wright
I arrived onsite at about 1:30 PM and met with Amit Sharma (property owner, Applicant) to observe
excavation conditions pertaining to the stability of a City owned road that the proposed wall will support.
When I arrived on -site, the Contractor (G2 Contracting) was in the process of constructing a temporary
ecology block wall to allow for the construction of the eastern basement wall of the residence. Within the
sidewall of the excavation for the ecology block wall, the Contractor had exposed the soil contact between
the buttress fill that had been placed during stabilization efforts in September 2019 and the native glacial
till. According to measurements made by the Contractor, the approximate elevation of the contact with the
glacial till was 265.5 ft.
Because of limitations on the excavation geometry, it was anticipated that the proposed upper retaining
wall would be founded on poorly compacted buttress fill and the Applicant's geotechnical engineer
recommended that the proposed upper wall be founded on pin piles in order to transfer the wall load down
to the competent glacial till. Based on the plans for the residence, prepared by CG Engineering, dated
March 30, 2020, the proposed bottom of footing elevation for the upper wall is 266 ft.
Based on observations made during excavation for the temporary basement retaining wall, the Applicant
requested that he be allowed to lower the footing for the upper retaining wall by 6 inches in order to bear
directly on the glacial till, thereby eliminating the need to install pin piles.
It is my understanding that the proposed upper wall will be located approximately 32 ft west of the edge of
the City roadway, which has an elevation of 284 ft at the highest point. Based on my observations and my
understanding of the proposed improvements, constructing the upper wall with a bottom of footing
elevation of 265.5 ft would require a temporary excavation slope of 1.5H:IV, and therefore is considered
to be generally feasible without impacting the City Right of Way.
The purpose of my site visit was to observe excavation conditions with respect to the stability of the City
Right of Way and the permit submittal documents related to the proposed improvements at 15712 72nd
Avenue West in Edmonds, Washington. No observations or recommendations were made pertaining to
other aspects of the residential construction at the site. The geotechnical services provided by Landau
Associates does not lessen the requirements for the Applicant's geotechnical consultant to serve as the
project's Geotechnical Engineer of Record and other design professionals to prepare an appropriate design
for the site conditions.
Visitors:
Unsatisfactory Conditions & Recommended Corrections: NA
Attachments: None
Distribution: Citv of Edmonds
Landau Associates' representatives are onsite solely to observe operations of the contractor identified, to form opinions about the adequacy of those operations, and report
those opinions to our client. The presence and activities of our field representative do not relieve the contractor from its obligation to meet contractual requirements. The
contractor retains sole responsibility for site safety and the methods, operations, and sequences of construction.
A preliminary copy of the Field Report may be provided solely as evidence that field observation was performed. Observations and/or conclusions and/or recommendations
conveyed in the Field Report are subject to review and revision by Landau Associates' project manager or designee. A reviewed Field Report shall take precedence over a
preliminary report.
130 2nd Avenue South • Edmonds, Washington 98020 • (425) 778-0907 • www.landauinc.com
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Field Report
Signed:
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