Report (-- "CROSSING AT BULL MOUNTAIN NO. 2"
LOT 161 /467-0ZP3-COZEZ____ 1
FOUNDATION CERTIFICATION
SE 1/4 SEC. 8, T 2 S, R ' W. 'N.M. /.506' so efite6LovE,
CITY OF TGARD, W4SH3NGTON COUNTY, OREGON
SURVEYED OCTOBER 9, 2023
' 1 PREPARED FOR:
ICH je USA
1 LOT 1509 SW SUNSE T BLVD. SUITE 2-D
752 PORTLAND, OR 97239
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OREGON N.
.c. JULY 9, 2002
›. TRAVIS C. JANSEN
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0 RENEWS: 6/30/2025
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..e I CERTIFY THAT I HAVE VERIFIED THE LOCATION OF THE SCALE
2 FOUNDATION UPON THE HEREIN DESCRIBED REAL PROPERTY 20 0 10 20
0 AND THAT I FOUND THE IMPROVEMENTS AS SHOWN TO BE In111"111INISO
5 UPON THE PREMISES AS HEREIN DESCRIBED, AND THEY DO 1 INCH = 20 FEET
g NOT ENCROACH ON THE PROPERTIES ADJACENT THERETO.
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% ' DRAWN BY: MJL DATE: 10/10/23
PACIFIC COMMUNITY DESIGN
5.1 REVIEWED BY: T2 DATE: 10/10/23
PLANNING - ENGINEERING - SURVEYING
pRo CT NO.:
jE 1 39-001
(503) 941-9484
Msr 2o2s-a9zz2,
GEOPfCIFIC
Real-World Geotechnical Solutions
Investigation• Design •Construction Support
October 3, 2023
Project No. 22-6162
Ichijo USA Co., LTD
Attn: Erik Gomez
1509 SW Sunset Blvd. Suite 2-D
Portland, Oregon 97239
Via email to: erik.gomez a ichijousa.com
FOUNDATION SUBGRADE REVIEW
LOT 161 RIVER TERRACE CROSSING AKA CROSSING AT BULL MOUNTAIN
15698 SW EVERGLADE AVENUE
TIGARD, OREGON
This letter addresses the single-family home foundation subgrade on Lot 161 of the River Terrace
Crossing development, also known as Crossing at Bull Mountain. We understand that the proposed
building is a two-story home with a daylight basement or a tall crawlspace. As part of this evaluation,
GeoPacific visited the site on September 25, 2023 to observe the subgrade foundation preparation.
At the time of our site visit, the foundation excavation was complete and generally extended
approximately 6 to 36 inches below the surrounding grades.
Subgrade generally appeared to consist of gravelly silt engineered fill. The deepest cut appeared to
expose competent native silt soil. The foundation layout of Lot 161 is stepped down to the east in
benches about 3 to 4 feet tall. The total vertical relief is approximately 10 feet. To the east of the
house footprint, grades slope down and away, at a grade of approximately 3H:1V. There is an
existing Lock+Load retaining wall to the south of the house footprint, but foundation is nearly level
with the bottom of the wall and the setback distance is such that the existing wall is not adversely
affected by the foundation excavation. Footing-to-wall and footing-to-slope setbacks did appear to
be adequate. Structural backfill may be necessary if footings are proposed near the vertical
benches.
Based on observed conditions, foundation subgrades as prepared are considered suitable to
support the planned allowable bearing pressure of 1,500 psf. Estimated settlement under the
allowable bearing pressure is 1-inch total, and 3/4 inch differential, measured over a horizontal
distance of 20 feet.
Care should be taken to avoid saturation or disturbance of footing subgrade soils during and after
excavation. If footing bearing soils become saturated or disturbed, any softened soil or slough
should be removed and replaced with crushed aggregate or additional concrete. In general, footing
excavations should be cleaned such that no more than approximately'h-inch of loose soils are
present prior to pouring concrete.
Construction should include typical measures for controlling subsurface water beneath the homes,
including positive crawlspace drainage to an adequate low-point drain exiting the foundation,
visqueen covering the exposed ground in the crawlspace, and crawlspace ventilation (foundation
14835 SW 72nd Avenue Tel(503)598-8445
Portland,Oregon 97224 Fax(503)941-9281
GeoPacific Engineering, Inc.
Job No.22-6162
Lot 161 River Terrace Crossing
vents). The homebuyers should be informed and educated that some slow flowing water in the
crawispaces is considered normal and not necessarily detrimental to the home given these other
design elements incorporated into its construction. Adequate crawlspace drainage is not something
that geotechnical consultants can verify; the purpose of our visit is for observations of foundation
bearing conditions only. Appropriate design professionals should be consulted regarding
crawlspace ventilation, building material selection and mold prevention issues, which are outside
GeoPacific's area of expertise.
We have prepared this report for Ichijo USA, and it should not be relied upon by third parties without
consulting GeoPacific. Within the limitations of scope, schedule and budget, GeoPacific attempted
to execute these services in accordance with generally accepted professional principles and
practices in the fields of geotechnical engineering and engineering geology at the time the report
was prepared. The conclusions and interpretations presented in this report should not be construed
as a warranty of the subsurface conditions.
No warranty, expressed or implied, is made. The scope of our work did not include flood hazard
evaluations, environmental assessments, the presence or absence of wetlands; or potential
hazardous substances in the soil, surface water, or groundwater at this site.
We appreciate this opportunity to be of service.
Sincerely,
GEOPACIFIC ENGINEERING, INC.
Benjamin G. Anderson, P.E.
Associate Engineer