Report (11) GEDPACIFIC
Real-World Geotechnical Solutions
Investigation•Design•Construction Support
June 2, 2023
Project No. 16-4108
Stonebridge Job No. 3243
l‘nAttention: Andy Thomas
�i 202-
Stonebridge Homes NW LLC
4230 SW Galewood St., Ste. 100 0° 519
Lake Oswego, OR 97035
Fax 503-387-7615
Email Andvestonebridgehomesnw.com; JimD(a�stonebridgehomesnw.com;
kristen(cr�dmhholdingsco.com
FOUNDATION SUBGRADE REVIEW
LOT 14 RIVER TERRACE CROSSING
j 15643 S.W.VANDERWOOD AVENUE-G-
WASHINGTON COUNTY, OREGON
Reference: NV5, Revised Summary Letter Geotechnical Construction Observation Services, Phases
1 and 2, River Terrace Crossing, SW Woodhue Street and SW 150th Avenue, Tigard,
Oregon, dated September 30, 2022.
GeoPacific Engineering Inc. visited the site today to review the single-family home foundation
subgrade at the above address. We understand that the proposed building is a two-story home. In
our opinion, the observed subgrade is adequate for support to an allowable bearing pressure of
1,500 psf.
At the time of our site visit, the excavation was complete, and soils exposed in foundation excavation
consisted of predominantly medium stiff to stiff fill soils that could be probed about 2 to 4 inches with
moderate pressure using a steel "T" bar probe. The expected maximum anticipated total and
differential footing movements (generally from soil expansion and/or settlement) are 1 inch and %
inch, respectively, over a span of 20 feet. A 2:1 slope is present to the west; the rear of the home is
near the base of the slope. Rear footing-to-slope setback was adequate, but it is likely that interior
granular fill is required to laterally support short vertical cuts.
Due to relatively impervious silty and clayey soils encountered throughout the site, all foundations
should incorporate appropriate drainage measures in accordance with the International Residential
Code. Adequate crawlspace drainage is not something that geotechnical consultants can verify; the
purpose of our visit is for observations of foundation bearing conditions only.
Our work scope pertains to a geotechnical engineer's foundation excavation review only and the
conditions existing and exposed at the time of our site visit. 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. No warranty, express or implied, is made. If you have
any questions, please call.
14835 SW 72nd Avenue Tel(503)598-8445
Portland,Oregon 97224 Fax(503)941-9281
. • GEOPACIFIC
Job No. 16-4108
Lot 14 River Terrace Crossing
Sincerely,
GeoPacific Engineering, Inc.
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OREGON
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EXPIRES:06/30/20 .
James D. Imbrie, G.E.
Geotechnical Engineer
41' 2623 .,-
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FOUNDATION CERTIFICATION
LOT 14 OF "CROSSING AT BULL MOUNTAIN",
CITY OF TIGARD, WASHINGTON COUNTY, OREGON
PREPARED FOR 166 4 S S v
STONE BRIDGE HOMES NW, LLC 1w"A, 1 � `/I� ,\ ti5
4230 GALEWOOD ST., SUITE 100 \ \
LAKE OSWEGO, OR 97035 LOT \ f�lL
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TRACT 56�. 6 \ l0
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N89'55'53"E 78.52' N
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06/06/2023
( REGISTERED PUE PUBLIC UTILITY EASEMENT SCALE: 1"=20 FEET
PROFESSIONAL
LAND SURVEYOR �_4/.,7,7":"/ �
20 0 4 10 20
OREGON j CURVE TABLE
JANUARY 11, 2005
ROBERT D. RETTIG CURVE RADIUS DELTA LENGTH CHORD
60124LS
RENEWS: 12/31/24 C1 191.00' 9 41'19" 32.30' S3O'46'48'E 32.26'
I, ROBERT D. RETTIG, A REGISTERED
PROFESSIONAL LAND SURVEYOR IN THE STATE CROSSING AT BULL MOUNTAIN LOT
OF OREGON, HEREBY CERTIFY THAT I HAVE 14
STAKED THE FOUNDATION FOR LOT 14 OF AKS ENGINEERING & FORESTRY, LLC CHKD: GWS
"CROSSING AT BULL MOUNTAIN" WITH 12965 SW HERMAN RD, STE 100 AK cHKo: PMR
HUBS AND TACKS ON DUNE 5, 2023. TUALATIN, OR 97062 AKS JOB:
P:503.563.6151 F:503.563.6152 aks—eng.com 9531