Report SJZ74,
GEDPIICIFIC
Real-World Geotechnical Solutions
Investigation• Design •Construction Support
August 24, 2023
Project No. 16-4108
Stonebridge Job No. 3276
Attention: Andy Thomas ) r
Stonebridge Homes NW LLC
r`
S 6
4230 SW Galewood St., Ste. 100 r
,4411*Gs , OR 97035 , ✓) )
503-387-7615 LA"
Email AndvOstonebridgehomesnw.com; JimD(a).stonebridciehomesnw.com;
kristen@dmhholdincisco.com
FOUNDATION SUBGRADE REVIEW
LOT 163 RIVER TERRACE CROSSING
15670 S.W EVERGLADE AVENUE
WASHINGTON COUNTY, OREGON
GeoPacific Engineering Inc. visited the site last week 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 stiff rocky fill soils that could be probed about 1 to 2 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 3/
inch, respectively, over a span of 20 feet. The lot is gently sloped to the east side. Footing-to-wall
and footing-to-rear slope setbacks were not adequate. Some structural fill in the interior of the
crawlspace may be required.
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 163 River Terrace Crossing
Sincerely,
GeoPacific Engineering, Inc.
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OREGON
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EXPIRES:06/30/20j
James D. Imbrie, G.E.
Geotechnical Engineer
FOUNDATION CERTIFICATION
LOT 163 OF "CROSSING AT BULL MOUNTAIN NO.2",
CITY OF TIGARD, WASHINGTON COUNTY, OREGON
N
PREPARED FOR i 5 6 76 c U#1 a �-
STONE BRIDGE HOMES NW, LLC */t I 1044 �
4230 GALEWOOD ST., SUITE 100 PUE PUBLIC UTIUTY EASEMENT
LAKE OSWEGO, OR 9703504,„ "
IN ��� SCALE: 1"= 20 FEET
.i ■-�
00 1 C4 20 0 4 10 20
I I LOT
{ 164
i I i S89'55'53"W 90.00'
1 ZU.0
_ o 013.0'
25' 30.6T 26.33' ,r~
1.00'
c
tco o 0
c a o
m to 2 c, 7.00' o
a
< ' LOT 1.00' �,1 n
LOT
0 3.00' 163 5.6�� 158
co
"44-
r o 6.25' 1.00 -�.,
D N 3.00'-�` o
0 11.00'
n Q o z
I<TI 1210' 55.00' 23.0'
o _ LOT
159
I f N89'55'53"E 90.00' }
{ , i LOT
l 162
I
08/24/2023
REGISTERED
PROFESSIONAL
LAND SURVEYOR I, ROBERT D. RET11G, A REGISTERED PROFESSIONAL LAND SURVEYOR IN THE STATE
c,,,,.. i OF OREGON, HEREBY CERTIFY THAT I HAVE STAKED THE FOUNDATION FOR LOT 163
OF "CROSSING AT BULL MOUNTAIN NO.2" WITH HUBS AND TACKS ON AUGUST 24,
2023.
OREGON
JANUARY 11. 2005 CROSSING AT BULL MOUNTAIN LOT
ROBERT D. RETTIG AK163 60124LS AKS ENGINEERING & FORESTRY, LLC atwn►: DMR
RENEWS: 12/31/24 12965 SW HERMAN RD, STE 100 cHER: PMR
TUALATIN, OR 97062 AKS JOB:
P:503.563.6151 F:503.563.6152 aks-eng.com 9531
DWG:9531CSTK I LOT 163