Sharma geo tech ret. wall-SITE REPORTL � COBALT
GEOSCIENCES
Date: September 15, 2020
Contractor: G2
Observations:
Project: Sharma SFR
Location: Edmonds
Cobalt Geosciences, LLC
P.O. Box 82243
Kenmore, Washington 98028
Job No.: 2019-329
Weather: Smoke 6o
At your request and authorization, Cobalt Geosciences, LLC was on site to evaluate the shallow
soil conditions in the area of the proposed retaining wall east of the residence. The foundation
area appeared suitable to support foundation loads (native till). Probe penetrations were less
than 1 inch.
The cuts east and north of the wall are up to 7 feet tall and faced with a 3 block high ecology block
wall. The slope above the wall is 1H:1V to 3/4H:1V and up to 15 feet tall (about). The temporary
slopes are in older fill but appear stable at this time. We notified the contractor that the proposed
shoring was Ultra block walls of greater height and block depth with a lower backslope in fill.
They (G2) are aware of these facts; however, are proceeding with the current system of blocks and
slope. We notified them that the City and other jurisdictions (L and I/OSHA) may stop work and
require changes to the system.
The current 3 block tall wall and cuts behind the walls appear stable at this time. If this method
of shoring is utilized, we recommend periodic visits by the geotechnical engineer be performed
(and requested by the owner/contractor) to verify stability.
We will return upon request to periodically verify overall stability. All exposed slopes should be
protected from wet weather with visqueen. The area behind the ecology block wall should be
backfilled with 5/8 inch clean angular rock. If sloughing or cracks appear, we must be notified
immediately so that we may provide additional recommendations. Contractor is responsible for
all site safety and the ongoing construction activities.
Sincerely,
Cobalt Geosciences, LLC
q4- -
Phil Haberman, PE, LG, LEG
Principal
PH/sc
2o63311097; philocobaltgeo.com
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