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Report (33) AA-5 I el-01-7_606/9 tA13(0. st, 6 Li � i _ e - oPc�fic Engineering,Inc. Real-World Geotechnical Soiutions February 23,2017 Investigation•Design.Construction Support Project No. 15-3729 Matt McBride Windwood Construction, Inc. 12655 SW North Dakota Tigard, Oregon 97223 FOUNDATION SUBGRADE REVIEW LOT 11 OLSON WOODS TiGARD, OREGON GeoPacific Engineering Inc. (GeoPacific) investigation of the site and provided recommendations ns foperformed to dev�menttal engineering on-call density testing and construction observations services during site development. This addresses the single-family home foundation subgrade on Lot 11. p We also conducted building is a two-story home with a crawl space We understand that the letter As part of this evaluation, GeoPacific visited the site last week to observe the subgrade preparation. At the time of our site visit, the foundation excavation was complete and extended to 18 inches below existingb9 foundation ground surface. The foundation bearing soils consisted of compacted fill which was evaluated with a 1/2-inch soil probe. Probing efforts resulted in 2 to 6 inches into the subgrade soils, indicating stiff consistency. The layout of the lot and adjacent the north, east, and south is relatively flat to gently sloping. Footing-to-wall and footing-to-sloppenet setbacks were evaluated were not an issue adjacent properties to e Based on observed conditions, foundation subgrades as prepared are co support the planned allowable bearingconsidered suitable to support pressure of 1,500 psf. Estimated settlement under the bearinga pressure is 1 inch total, and%inch differential, measured over a horizontal distance llowabl of 20 feet. Care should be taken to avoid saturation or disturbance of footing subgrade excavation. If footing bearing soils become saturated or disturbed, any softened should be removed and replaced with crushed � e soils during and after excavationsoushould be cleaned such that no moreg than approximately soil or slough aggregate or additional Concrete. In general, footing present prior to pouring concrete. /-inch of loose soils are Construction should include typical measures for controlling subsurface water beneath including positive crawlspace drainage to an adequate low-point the homes, visqueen covering the exposed ground in the crawlspace, and crawlspace ventilation (foundation vents). The homebuyers should be informed and educated drain exiting the foundation, cr awlspaces is considered normal and not necessarily detrimental to the home wainer design elements incorporated into its construction Adequate Crawls me given these weer that geotechnical consultants can verify;the purpose of our visit is for observations of foundation pace drainage is not something bearing conditions only. Appropriate design professionals should be consulted regarding 14835 SW 72nd Avenue ng Portland,Oregon 97224 Tel(503)598-8445 Fax(503)941-9281 d GeoPacific Engineering, Inc. Job No. 15-3729 Lot 11 Olson Woods crawlspace ventilation, building material selection and mold prevention issues, which are outside GeoPacfic's area of expertise. We have prepared this report for Windwood Homes, 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. ,,..0 PROp4si. s �c?5 ‘ `'' <:5 ©1- 147E/ r' V/ OREGON / �' SD.IM�P EXPIRES:06/30/20 0 James D. lmbrie, P.E. Geotechnical Engineer