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Plans (2) /1 g60 Sc,J t.J1 t i(t/r" FOUNDATION CERTIFICATION '"s'Z° -��� WASHINGTON COUNTY TAX MAP 2S.1 .03BD. TAX LOT 400, CITY OF TIGARD, WASHINGTON COUNTY, OREGON PREPARED FOR WESTWOOD HOMES, LLC ALNUT $� 12700 NW CORNELL RD $ PORTLAND, OR 97229 o N80'03'30* 83.55' o TAX •' LOT 300 „ 71 A ---15.1' SCALE: 1"= 50 FEET 111 � 50 0 20 30 40 50 7.7' 15.1' TAX "g TAX 04/21/2022 LOT LOT N REGISTERED 602 400 o PROFESSIONAL LAND SURVEYOR tr, LOT CO a' 301 w = N JANUOARY N 122,, 2016 MICHAEL S. KAUNA 89558PLS RENEWS: 6/30/23 I, MICHAEL S. KALINA, A REGISTERED PROFESSIONAL LAND SURVEYOR IN THE STATE OF OREGON, HEREBY CERTIFY THAT I HAVE STAKED THE FOUNDATION FOR „ a3,�7' TAX LOT 400, WASHINGTON COUNTY TAX MAP S79'22'30 W 25.1.03BD, WITH HUBS AND TACKS ON APRIL 20, 2022. TAX LOT TAX LOT 11900 11850 SW WALNUT STREET 400 AKS ENGINEERING & FORESTRY, LLC DRWN: AMB 12965 SW HERMAN RD, STE 100 CHKD: MSK TUALATIN, OR 97062 AKS JOB: P:503.563.6151 F:503.563.6152 aks—engcom 9137 DWG:9137CSTK I FOUNDATION CERT �w. GEDPIIICIF1C Real-World Geotechnical Solutions Investigation • Design •Construction Support April 19, 2022 GeoPacific Project No. 13-3036 Westwood Homes, LLC 12700 NW Cornell Road Portland, Oregon 97229 Phone: 503-715-2383 Via email to: Christian@westwoodhomesllc.com Subject: GEOTECHNICAL OBSERVATION OF FOUNDATION SUBGRADE 11860 SW WALNUT STREET HILLSBORO, OREGON GeoPacific visited the site yesterday to observe the foundation preparation for the single-family home planned at 11860 SW Walnut Street in Tigard, Oregon. It is our understanding that the planned structure will have a crawl space and utilize conventional spread footings. At the time of our arrival, the excavation was complete and extended approximately 12 to 18 inches below the surrounding grade. The foundation bearing material appeared to consist of native silt soils, which were determined to be medium stiff consistency when evaluated with a hand probe. The footing layout of the home and the adjacent properties is relatively flat. Footing-to-wall and footing-to-slope setbacks do not appear to be an issue. Based on observed conditions, foundation subgrade soils as prepared are considered suitable to support the anticipated allowable bearing pressure of 1,500 psf. Estimated settlement under the allowable bearing pressure is 1 inch total, and '/2 inch differential, measured over a horizontal distance of 20 feet. 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. In general, footing excavations should be cleaned such that no more than approximately '/2-inch of loose soils are present prior to pouring concrete. Construction should include typical measures for controlling subsurface water beneath the homes, including positive crawlspace drainage to an adequate low-point drain exiting the foundation, visqueen covering the exposed ground in the crawlspace, and crawlspace ventilation (foundation vents). The homebuyers should be informed and educated that some slow flowing water in the crawlspaces is considered normal and not necessarily detrimental to the home given these other design elements are incorporated into its construction. Appropriate design professionals should be consulted regarding crawlspace ventilation, building material selection and mold prevention issues, which are outside GeoPacific's area of expertise. 14835 SW 72nd Avenue Tel (503) 598-8445 Portland, Oregon 97224 Fax(503) 941-9281 Westwood Homes, 11860 SW Walnut GeoPacific Project No. 13-3036 We have prepared this report for Westwood Homes, LLC, and it should not be relied upon by third parties without consulting GeoPacific. 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. The conclusions and interpretations presented in this report should not be construed as a warranty of the subsurface conditions. No warranty, expressed or implied, is made. The scope of our work did not include flood hazard evaluations, environmental assessments, the presence or absence of wetlands; or potential hazardous substances in the soil, surface water, or groundwater at this site. We appreciate this opportunity to be of service. Sincerely, GEOPACIFIC ENGINEERING, INC. ��RE©PR Op 44/0 1yG 1 N EFR s�o 1,4743PE J / r OREGON ✓.1"v 23 i99C D1the'° EXPIRES:O8130/2Q23 James D. Imbrie, P.E. Principal Geotechnical Engineer EPM 2 GEOPACIFIC ENGINEERING, INC.