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Report ' 1 ;u l� 17. 2013 1: 58PM No. 3930 P. 1 SOR 6/480P Engineering, Inc. g� a • `� Real -world Go i ��!y` -; olut onSS • • Desig a ��. 13 Jul 17, 2013 • Const ruction �' ��0� July , ,,vN 1 Project N. 03 -8449 - ~ �� Stonebridge Homes Job No. 1471 � .. Z: � f B Lin ' • Attention: Andy Thomas 5L/ Stonebridge Homes 4230 SW Galewood St., Ste. 100 Lake Oswego, OR 97035 /� n Fax 503 - 387 -7615 V I 01 3 "'— FOUNDATION SUBGRADE REVIEW LOT 100 – ARLINGTON HEIGHTS NO.3 15381 SW SUMMERVIEW DRIVE OD 4 CITY OF TIGARD, OREGON GeoPacific Engineering Inc. visited the site this June to review the single family home foundation layout on Lot 100. Some soft and organic fill was encountered in the rear footing line of the home. This material was overexcavated and replaced with compacted granular fill. 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 medium stiff to stiff fill soils on the front and very stiff native soils 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 also adequate. 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 (503) 598-8445 Portland, Oregon 97224 Fax (503) 941 -9281 Jul. 17. 2013 1: 5 8 PM GeoPacific engineering, Inc. Job No. 03 -8449 Lot 100 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. Sincerely, GeoPacific Engineering, Inc. � � ar E r tA 9 7 4 � • OREGON ✓ 23 s D.1 EXPIRES: 06/30/2015 James D. Imbrie, G.E. Geotechnical Engineer