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JAMES BURTON BROWN
60379
RENEWS: DECEMBER 31, 2017
CLIENT: MISSION STAKEOUT
DATE: OCT 30,2017
N BY: JBB LOT 3 MISSION MEADOWS CENTERLINE CONCEPTS
C/TY/COUNTY/OREGON LAND SURVEYING,INC.
SHEET No. 10F 1 19376 MOLALLA AVE, SUITE 120
OREGON CITY, 97045
`` SCALE.'1'1=20' PHONE 503.650.0188OR FAX 503.650.0189
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Plotted: 11/03/2017– 10::06am, M:\BUILDER SERVICES\Stakeout Drow/ng\LOT 3, MISSION MEADOWS\dwg\STAKEOUT.dwg, Layout: Model
• .
COOP MO
• Engineering.Inc.
Real-World Geotechnical Solutions
•Investigation
•Design
•Construction Support
November 9, 2017
Project No. 17-4481
Kurt Dalbey
Mission Homes NW, LLC
PO Box 1689
Lake Oswego, OR 97035
FOUNDATION SUBGRADE REVIEW
LOTS 3 AND 4 MISSION MEADOWS
TIGARD,OREGON
GeoPacific Engineering Inc. visited the site to review the single-family home foundation subgrades
at the above referenced lots. In our opinion, the observed subgrades are 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 site visit, the excavations were complete, between 0.5 to 1 foot in depth, which exposed dry,
medium stiff, native clayey-silt. These materials probed 6 to 12 inches and are considered adequate
to support the planned foundation loads. Footing-to-slope or footing-to-wall setbacks were not an
issue. Lot 4 had large roots that were removed. The footings otln s were deepened on this lot.
9 P
Due to relatively impervious 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.
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 72nd Avenue Tel(603)598-8445
Portland,Oregon 97224 Fax(503)941-9281