Report Sep.'29. 2010 5.21P,M• No. 0917 ,P. 1 i. ' it . 'l . ' i.
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" , . Engineeringlnc.
. . . 7312 SW Durham Road .
Portland, Oregon 97224
Tel (503) 6984445 • Fax (503) 5984705
September 29, 2010 .
' Project No. 03 -8449
Attention: Blake Agate
• ' Stonebridge Homes
4230 SW Galewood St., Ste. 100
Lake Oswego, OR 97035
. , Fax 503 -387 -7615
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IFOUNDA7ION
EXCAVATION REVIEW �� J °� �® �� ®/S
. , i ` LOT 106 — ARLINGTON HEIGHTS NO'. 3 /` 5 3- 0 s SW S t t G - 2 z) R . is • ICITY:OF TIOARD, OREGON , H , ' l �'i 1 � l '
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,' 1 iGeoFacific �Engineering.lnc. visited! the, site' today to review the•,single family hbrrie foundation'I layout l i ii l ! ' ,' I I�i! ,.
on L 105. We understand that the proposed building is a ItworstorY home,' In our �opinion,l they � j +�, ! " `, I , a'
' .u.. ' observed, s ubgrade is generally adequate IforIsupport to an allowable bearing pressure' of +1;500;p`sf. ; ,1' ' - ! d ' 1�_
'The'epected'maximum anticipated total and differential footing; movements '(generally;' from'soil I . '
expansion and /or settlement) are 1 inch and g inch, respectively, over i span of 20 feet. '
At the'time of our site visit, soils exposed in foundation excavation consisted of predominantly very
stiff residual and loess soil, and some weathered rock that could be probed less than about 1 /2 inches
with medium pressure using a steel "r bar probe. These soils are considered adequate to support
the planned foundation loads. Footing -to -slope setbacks are not an issue and foundation
embedment depths appeared adequate.
We understand that the proposed residence will be a two- story single - family home with slabs -on-
grade. Due to silty clay 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
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low-point drain. '
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4, Care; should betaken to avoid saturation or disturbance of footing subgrade soils•duringland after ,1 0 excavation: 1 If'footing bearing soils become saturated or disturbed any softened soil or slough I V 1 ,,should be removed and replaced with crushed aggregate or additional concrete. • In gener footing 1', ,
' ' , excavat sho uld ' be c such that no more than ,about 1 /2 inch of loose soils is prese t'prior tot !I I ! 1 „; I++
pouring-Concrete 1 ,, I I, ; ' ; ,, I i .
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Sep. 29' 2010 5:21PM No. 0917 P. 2
-, , i® GeoPacific Engineering, Inc.
Job No. 03.8449
Lot 106 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 I
' and budgets , GeoPacific attempted to execute these services in accordance with generally accepted
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■ � professionals principles and practicesj,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 ; • r. • . i lany questi'ons,� call: , I , i V I, Siii1 1 I • i , ! • ' . i , ',1 ,Ii..: �cerely • i � 4,, ''.
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' !GeoPacific, Enginsenng, Inc. 1 ' '
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0 • OREGON
EXPIRES: 06/3012041
James D. Imbrie, G.E. I
Geotechnical Engineer • '
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