Report GeoPacific
lngincennp,Inc.
Real-World Geotechnical Solutions
Investigation• Design• Construction Support
July 31, 2015
Project No. 12-2704
Stonebridge Project No. 1861 S12e 15 •
Stonebridge Homes OOO 9
4230 SW Galewood St., Ste. 100
Lake Oswego, OR 97035
Fax 503-387-7615
Email Andy @stonebridgehomesnw.com; JimDc stonebridoehomesnw.com
RE: FOUNDATION SUBGRADE REVIEW
SOUTH VIEW SUBDIVISION LOT 24
12028 AUTUMNVIEW STREET
TIGARD, OREGON
References: GeoPacific Engineering, Inc., Geotechnical Explorations, Knauss Property
Subdivision, 12035 Southwest Beef Bend Road, Washington County, Oregon, report
dated August 10, 2012.
GeoPacific Engineering Inc. visited the site Wednesday to review the single family home foundation
subgrade on Lot 24. We understand that the proposed building is a two-story garage under style
home. In our opinion, the observed subgrade is generally adequate for support to an allowable
bearing pressure of 2,000 psf. The expected maximum anticipated total and differential footing
movements (generally from soil expansion and/or settlement) are less than 1 inch and S/4 inch,
respectively, over a span of 20 feet.
At the time of our site visit, the excavation was nearly complete. The excavation consisted of
predominantly very stiff native silt and very stiff engineered fill soil that could be probed less than 1/4
inch with heavy pressure using a steel "T" bar probe. This rock is considered adequate to support
the planned foundation loads. Footing-to-slope setbacks were adequate and foundation embedment
depths appeared adequate.
Due to rocky and silty soils encountered throughout the site, all foundations should incorporate
appropriate drainage measures. Crawlspaces should be provided with a low-point drain and pass
through pipes should be installed through footings which would otherwise restrict water flow to the
low-point drain. A small seep is evident coming from fractures in the rock.
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.
14835 SW 72"d Avenue Tel (503)598-8445
Portland, Oregon 97224 Fax (503) 941-9281
Project No. 12-2704
South View Lot 24
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.
Sincerely,
•
GEOPACIFIC ENGINEERING, INC.
01,0) PRO,c siFS
.GIN�F
w 9 1
14 /
0 EG.N
✓,y s D.1tAov
EXPIRES:06/30/20(7
James D. lmbrie, P.E., G.E.
Geotechnical Engineer
- 2-
FOUNDATION CERTIFICATION
LOT 24 OF "SOUTH VIEW HEIGHTS"
CITY OF TIGARD, WASHINGTON COUNTY, OREGON
1 2oZ$ SW A„y,,..r... ✓—,, s+--.
5_-26i5- o'O9q
SW AUTUMNVIEW STREET
in
N
S88'26140"E 44.01'
SCALE 1" = 20 FEET
20 0 8 12 18 20 VCE c�c) �. �'
tl.,
5.0'--- �- 30.00' °010.00' •y�
o 3.00 5.00' `��
= 7,1"
Z
zo LOT 23 N b W
.,) LOT 24 8 >
10.00' $ a
-
'1,1 o ,;, W
N a, U) pl
>
g .e ",:12 k u
� Cl)
20.00' -- 10.d -- >-
v Q, I o . >
z CC
a
n3.0' STE`----1 I
N
8.0' PUE--+ -- CO
N
C.�
PUE = PUBLIC UTILITY EASEMENT LOT 26 N88'26'40 W 60.00'
STE = STREET TREE EASEMENT LOT 25 23'
VCE = VISUAL CLEARANCE EASEMENT
�--2 -3o-15
REGISTERED ■ I, ROBERT RETTIG, A REGISTERED PROFESSIONAL LAND SURVEYOR IN THE STATE OF OREGON,
PROFESSIONAL HEREBY CERTIFY THAT I HAVE STAKED THE FOUNDATION FOR LOT 24 OF "SOUTH VIEW HEIGHTS"
LAN SU- •YO R WITH HUBS AND TACKS.
L
PREPARED FOR BEEF BEND ROAD
L / EGON VENTURE PROPERTIES, INC. DRAWN BY:MEBICHECKED BY:RDRIDwc:3252CSTK IJOB: 3252
JANUARY 11, 2005 4230 SW GALEWOOD STREET AKS ENGINEERING St FORESTRY, LLC
ROBERT D. RETTIG SUITE 100 12965 SW HERMAN RD SUITE 100
60124LS LAKE OSWEGO, OR 97035 TUALATIN, OR 97062 www.aks-eng.cam
RENEWS: 12/31/16 PHONE: 503.563.6151 FAX: 503.563.6152 AME