HomeMy WebLinkAboutPlans (2) Air— "CROSSING AT BULL MOUNTAIN"
LOT 90
HUB AND TACK CERTIFICATION
SE 1/4 SEC. 8, T 2 S, R 1 W, W.M,
CITY OF TIGARD, WASHINGTON COUNTY, OREGON
SURVEYED AUGUST 9. 2023
PREPARED FOR:
ICHIJO USA
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TRAVIS C. JANSEN
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c I CERTIFY THAT I HAVE VERIFIED THE LOCATION OF THE SCALE
o FOUNDATION UPON THE HEREIN DESCRIBED REAL PROPERTY 20 0 10 20
13 AND THAT I FOUND THE IMPROVEMENTS AS SHOWN TO BE -MIE- --
o UPON THE PREMISES AS HEREIN DESCRIBED, AND THEY DO 1 INCH = 20 FEET
g NOT ENCROACH ON THE PROPERTIES ADJACENT THERETO.
�QRAWN BY: MJL DATE:08f09/23 PACIFIC COMMUNITY DESIGN
a REVIEWED BY: T2 DATE:08/09/23 PLANNING ENGINEERING SURVEYING
Z PROJECT NO.: 139-001 (503) 941 9484 J
1110
GEOPF1CIFIC
Real-World Geotechnical Solutions
Investigation • Design •Construction Support
August 3, 2023
Project No. 22-6162
IchAttn: USA meo., LTD 1/1 -
Attn: Erik Gomez ' _ L
1509 SW Sunset Blvd. Suite 2-D
Portland, Oregon 97239
Via email to: erik.domez(&)chijousa.com
FOUNDATION SUBGRADE REVIEW
LOT 90 RIVER TERRACE CROSSING AKA CROSSING AT BULL MOUNTAIN
15159 SW HUNTWOOD STREET
TIGARD, OREGON
This letter addresses the single-family home foundation subgrade on Lot 90 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 crawlspace. As part of this evaluation, GeoPacific visited the site
on August 1, 2023.
The excavation on lot 90 is sloped down very gently, at an average grade of about 5 percent or less,
to the southwest. The excavation is about 6 to 12 inches below surrounding grades. The exposed
subgrade generally consisted of native silt and bedrock.
Footing-to-slope and footing-to-wall setbacks did not appear to be an issue for the structure. There
is an existing Lock+Load retaining wall along the northern property boundary, but the excavation is
set back a sufficient distance and is shallow so that the retaining wall is not affected.
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 '/z-inch of loose soils are
present prior to pouring concrete. Also, crushed rock placed over the surface of the subgrade should
be compacted so that no more than approximately 1/2-inch of loose gravel is 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
vents). The homebuyers should be informed and educated that some slow flowing water in the
14835 SW 72nd Avenue Tel(503)598-8445
Portland,Oregon 97224 Fax(503)941-9281
GeoPacific Engineering, Inc.
Job No.22-6162
Lot 90 River Terrace Crossing
crawlspaces 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