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Report GeoP iNI c Engineering.Inc. Real-World Geotechnical Solutions Investigation•Design•Construction Support March 24, 2015 Project No. 12-2704 Stone Bridge Project No. 1854 Stonebridge Homes h S7124) 15- Qp©f 4230 SW Galewood St., Ste. 100 11 Lake Oswego, OR 97035 Fax 503-387-7615 Email Andvtc stonebridgehomesnw.com; JimDi stonebridgehomesnw.com RE: FOUNDATION EXCAVATION REVIEW SOUTH VIEW SUBDIVISION LOT 17 12053 AUTUMNVIEW STREET TIGARD, OREGON References: GeoPacific Engineering, Inc., Geotechnical Explorations, Knauss (Property Subdivision, 12035 Southwest Beef Bend Road, Washington County, Oregon, report dated August 10, 2012. GeoPacific Engineering Inc. visited the site today to review the single family home foundation subgrade on Lot 17. We understand that the proposed building is a two-story garage under style home. In our opinion, the observed subgrade is generally adequate for support to an allowable bearing pressure of 2,000 psf. The expected maximum anticipated total and differential footing movements (generally from soil expansion and/or settlement) are less than 1 inch and 3/ inch, respectively, over a span of 20 feet. At the time of our site visit, the excavation was complete and covered with crushed aggregate. The excavation consisted of predominantly stiff to very stiff, loess and some stiff, reddish brown, clayey silt residual soil that could be probed less than 1/4 inch with heavy pressure using a steel "T" bar probe. These soil conditions are considered adequate to support the planned foundation loads. Footing-to-slope setbacks were adequate and foundation embedment depths appeared adequate. Some backfilling of the rear wall below the lowest step will be necessary. Some groundwater seepage was evident near the contact between the two soil layers. Extra gravel in the crawlspace may be necessary. Due to silty and clayey soils encountered throughout the excavation, 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 low-point drain. Care should be taken to avoid saturation or disturbance of footing subgrade soils during and after excavation. If footing bearing soils become saturated or disturbed, any softened soil or slough should be removed and replaced with crushed aggregate or additional concrete. 14835 SW 72nd Avenue Tel (503) 598-8445 Portland, Oregon 97224 Fax(503)941-9281 Project No. 12-2704 South View Lot 17 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‘�0 PROFF 414�5�� GINEF�`S>O OREGON v14,1/.23 14:5Q'o, EXPIRES:06/30/20./5 James D. Imbrie, G.E. Geotechnical Engineer -2 - FOUNDATION CERTIFICATION " 57-2,4,,,, LOT 17 OF "SOUTH VIEW HEIGHTS" ¢� CITY OF TIGARD, WASHINGTON COUNTY, OREGON LOT 33 'ASPEN RIDGE' /0053 c- "°- S88'17'18"E 40.00' `A., 5.0' 29.00' cp in co o o LOT 18 o LOT 17 r) LOT 16 S M a Z 2.50' 19.50' W 9.50' 6.0' a le SCALE 1" = 20 FEET — II IN IN T b N 20 0 8 12 16 20 N88'26'40"W 40.00' STE = STREET TREE EASEMENT ;.', PUE = PUBLIC UTILITY EASEMENT `V _ SW AUTUMNVIEW STREET c3 <-2(4-15 REGISTERED I, ROBERT RETTIG, A REGISTERED PROFESSIONAL. LAND SURVEYOR IN THE PROFESSIONAL STATE OF OREGON, HEREBY CERTIFY THAT I HAVE STAKED THE FOUNDATION LAN S U RV YO R FOR LOT 17 OF 'SOUTH VIEW HEIGHTS' WITH HUBS AND TACKS. PREPARED FOR BEEF BEND ROAD VENTURE PROPERTIES, INC. DRAWN 8Y:BRHICHECKED BY:RDR IDwG:3252CSTK IJOB: 3252 JANUARY 11, 2005 4230 SW GALEWOOD STREET AKS ENGINEERING & FORESTRY, LLC ROBERT 0. RETTIG i SUITE 100 12965 SW HERMAN RD SUITE 100 AKC 60124LS LAKE OSWEGO, OR 97035 TUALATIN, OR 97062 www.oks-eng.com RENEWS: 12/31/16 PHONE: 503.563.6151 FAX: 503.563.6152 AIIMIIIIM