Report II10. 2413 10:47AM; No. 4043 P. 1
. f l .
GeoPTa ,..
. • .
• Engineering,Inc.
Real-World Geotechnical Solutions
•Investigation
•Design
•Construction Support
October 3,2013
Project No.03-8449 �S
Stonebridge Homes Job No. 1452 1) 5 L 22 q 1' SL. Oc cAo„..4 P/
Attention:Andy Thomas and Jim Delmore r°t 51—.2_013— 60 /64
Stonebridge Homes
4230 SW Galewood St.,Ste. 100
Lake Oswego,OR 97035
Fax 503-387-7815
Email JimD@stonebridgehomesnw.com
FOUNDATION SUBGRADE REVIEW
LOT 81—ARLINGTON HEIGHTS NO.3
15394 SW OAKMONT PLACE
CITY OF TIGARD,OREGON
Geopacific Engineering Inc. visited the site this week to review the single family home foundation
layout on Lot 81. The foundation excavation reached medium hard rock on the lower half. In our
opinion, the observed subgrade is now generally adequate for support to an allowable bearing
pressure of 1,500 psf. 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.
At the time of our final site visit,the excavation was complete and exposed stiff native soils on the
front and medium hard rock on the lower footing line. These materials are considered adequate to
support the planned foundation loads. Footing-to-slope setbacks are adequate and footing-to-wall
setbacks are not an issue.
Due to relatively impervious soils encountered throughout the site, all foundations should incorporate
appropriate drainage measures in accordance with the International Residential Code. Adequate
crawispace drainage is not something that geotechnical consultants can verify; the purpose of our
visit is for observations of foundation bearing conditions only.
Care should be taken to avoid saturation or disturbance of footing subgrade soils during and after
excavation. We observed some placement of crushed aggregate to protect the subgrade from wet
weather. 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 about 1/2 inch of loose soils is present prior to
pouring concrete.
14835 SW 724 Avenue Tel(503)5984445
Portland,Oregon 97224 Fax(503)941-9281
10. 2013 10:08AM No. 4043 P. 2
GeoPacific Engineering, Inc.
Job No.03-8449
Lot 81 Arlington Heights No.3
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. ,,,q� D4 - P�
Sincerely, �'` l
5
.GeoPac�C Engineering,Inc. l��1 �0°1-
�
� (�j
�G N guess/o ,rn �
„.1) , " Y . `
147 _•
r OREGON
LO
.SD.IN
EXPIRES:06/30/20)
James D.Imbrie,G.E.
Geotachnical Engineer
/6--3621 s� .'it"'a h.4-
p,.
FOUNDATION CERTIFICATION •5f2cyl-- Co/5'1
LOT 81 OF "ARLINGTON HEIGHTS NO. 3"
CITY OF TIGARD, WASHINGTON COUNTY, OR
14' I 14' i i LOT 82 ' 1
i o i
' 8.00' PUE I
I r r! + S88'16'24"E 101.59'
i
i -- 1-20.0'
Q } 45.50' 25'II ,
,� ° ° . al r
Ni rr N N c:,
moo, U/ d i r I c Q
/ ,' 4.00' LOT 81 I N
/ � 1/ '/ 0 15.00' I ,
/ Q �/ / 3.00' -CD
1 W
i O / / O - ! I
i\/ (� ^�' 59.50' Z
CO / /i i/^ . 1.9 2' O I
• �, 0, /
/ ;� , i
/ ,r u
�ao Z
N /
//�T/S pp• S,pp.W 0�9 �r c_, J .
/ sly BS ' ° l /
�/ F tie
6 h o / Q
,/ //i BSp• f ,� i /
%%%/1 pUF LOT 79 LOT 80 ,• [ � ;, /
,, 4,.1----4 '' i
PUE = PUBLIC UTILITY EASEMENT SCALE 1" = 20 FEET
SWE = PUBLIC PEDESTRIAN ACCESS EASEMENT
WME = WALL MAINTENANCE EASEMENT
CURVE TABLE " "
PREPARED FOR
CURVE RADIUS DELTA LENGTH CHORD STONE BRIDGE HOMES NW
Cl 164.00' 14'25'28" 41.29' N13°51'31"E 41.18' 16869 SW 65TH AVE #505
C2 200.00' 18'39'28" 65.13' S11'O3'2O"W 64.84' LAKE OSWEGO, OR 97086
I, ROB REf11G, A REGISTERED PROFESSIONAL LAND SURVEYOR IN THE STATE OF OREGON, HEREBY CERTIFY THAT I HAVE
ACCU ELYg KED�TIE FOUNDATION FOR LOT 81 OF "ARLINGTON HEIGHTS NO. 3" WITH HUBS AND TACKS.
REGISTERED
PROFESSIONAL JOB NAME: ARLINGTON HEIGHTS AKS ENGINEERING AND FORESTRY, LLC
LAND SURVEYOR 13910 SW GALBREATH DR
AK
JOB NUMBER: 2643 SUITE 100
SHERWOOD, OR 97140
PHONE: 503.925.8799
4, .-
G N DRAWN BY: BDT FAX: 503.925.8969
LJANUARY 1 2005
ROBERT D. RETTIG CHECKED BY: RDR ENGINEERING • PLANNING • SURVEYING
6O124LS J FORESTRY • LANDSCAPE ARCHITECTURE
RENEWS: 12/31/14 DWG NO.: 2643CSTK