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Report
0. .. r v • • J .... .... . .u , e Coop Engineering,Inc. Real-World Geotechnlcal Solutions •Investigation •Design •Construction Support August 29, 2013 Project No. 03-8449 Stonebridge Homes Job No. 1460 /53 82- 5" J4(1/-9 d:.., J,Uy% Attention: Andy Thomas rs7-20,13. cYo /7 g Stonebridge Homes 4230 SW Galewood St., Ste. 100 Lake Oswego, OR 97035 Fax 503-387-7615 FOUNDATION SUBGRADE REVIEW LOT 89—ARLINGTON HEIGHTS NO.3 15382 SW ARLINGTON TERRACE CITY OF TIGARD,OREGON GeoPacific Engineering Inc. visited the site August 28`1 to review the single family home foundation subgrade on Lot 89. Engineered fill was observed of the majority of the home. 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 3/ 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. 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. Some interior backfilling may be necessary to laterally support footings near steep bench cuts. Due to relatively impervious soils encountd red 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 72°6 Avenue Tel(503)598-8445 Portland,Oregon 97224 Fax(503)941-9281 GeoPacific tngineenng, Inc. . Job No.03-8449 Lot 89 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. .c��cj PRO �C��' �4G1NFF,Q 4) 147E // r w OREGON 23 , ' SD.A EXPIRES:06/30120/S James D. Imbrie, G.E. Geotechnical Engineer • FOUNDATION CERTIFICATION LOT 89 OF "ARLINGTON HEIGHTS NO. 3" ' CITY OF TIGARD, WASHINGTON COUNTY, OR i ° LOT 88 L15:0/I o 25' LUI Lc) u; ' SSE ' i V I co S88'16'24"E 93.02' + 1 I i.,!") o�z j o I 42.00' iiiiir i Ni 1 1 ® 1 i 7.50' . i o I I 1 1 in 0 L 1 N I O Lc)1- 0 i Too' LOT 89 1 0 i 3.00' 7.00' i C TRACT 'J' it CIC'j I I CZX 1 U' N G`N' `AT EASEMENT `' g/ I 3 / LINE 44.50' / 1 I 1 I 1 I I i 25' } i 0 , N88'16'24"W 96.30' 41 I 1 1 1 I "' n / �1�8.0' 1 ' '°uE LOT 90 1 1 1 I I 1 SCALE 1" = 20 FEET PUE = PUBLIC UTILITY EASEMENT E >. s r ` SSE = SANITARY SEWER EASEMENT t* „� r� YAM co V mom ° CURVE TABLE PREPARED FOR CURVE RADIUS DELTA LENGTH CHORD STONE BRIDGE HOMES NW 16869 SW 65TH AVE #505 Cl 250.00' 09'17'45" 40.56' N6'22'28"E 40.52' LAKE OSWEGO, OR 97086 I, ROBERT RETTIG, A REGISTERED PROFESSIONAL LAND SURVEYOR IN THE STATE OF OREGON, HEREBY CERTIFY THAT I HAVE ACCURATELY STAKED THE FOUNDATION FOR LOT 89 OF ARLINGTON HEIGHTS NO. 3" WITH HUBS AND TACKS. ©3 -29- 13 ( REGISTERED PROFESSIONAL JOB NAME: ARLINGTON HEIGHTS AKS ENGINEERING AND FORESTRY, LLC LA S U' YO R 13910 SW GALBREATH DR JOB NUMBER: 2643 SUITE 100 -7'. a `t f =,w r,/ SUITE 100, OR 97140 t_ A PHONE 503.925.8799 4 '"`3 a -i % DRAWN BY: NEB FAX: 503.925.8969 J NUARY' 11, 2005 -4�` r `Fi**'s � �:��-..� --;orb= ROBERT D. RETTIG , CHECKED BY: RDR ENGINEERING • PLANNING • SURVEYING _ _60124LS __ _ RENEWS: 12/31/14 DWG NO.: 2643CSTK FORESTRY • LANDSCAPE ARCHITECTURE