Report �oi3'o°10�
GeoP icitig
Engineering,Inc.
Real-World Geotechnical Solutions
Investigation • Design • Construction Support
September 13, 2013
GeoPacific Project No. 13-3167
TCB Concrete
3kidsomy(a�gmail.com
9862 Queen Circle Drive
The Colony, TX 75056
Phone 972-625-4827
FOUNDATION SUBGRADE REVIEW
BRENTWOOD ESTATES LOT
13943 SW 155th TERRACE
CITY OF TIGARD, OREGON
GeoPacific Engineering Inc. visited the site this week to review the single family home foundation layout at the
above address. We understand that the proposed building is a two-story home. In our opinion, the observed
subgrade is 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 3/4 inch, respectively, over a span of 20 feet.
At the time of our site visit, the excavation was complete. The rear half of the excavation consisted of
predominantly medium stiff, native silt soil that could be probed less than 4 inches with medium to heavy
pressure using a steel "T" bar probe and the front half exposed compact fill. The subgrade is considered
adequate to support the planned foundation loads. Footing-to-slope setbacks are not an issue and foundation
embedment depths appeared adequate. Interior footings should be backfilled to laterally support exposed
vertical cuts. GeoPacific should revisit the site to review the final crawlspace configuration.
Foundations should also incorporate appropriate drainage measures in accordance with the International
Residential Code. Adequate 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, expressed or implied, is made. If you have any questions, please call.
Sincerely,
9,E3 PROFFSs
GeoPacific Engineering, Inc. ��
Q 147
OREGON
23 AtIfP
James D. Imbue, G.E. / SD. ,
Geotechnical Engineer
EXPIRES:06/30/20/
14835 SW 72nd Avenue Tel (503) 598-8445
Portland, Oregon 97224 Fax (503) 941-9281