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Report "TRILLIUM HILL" ''5t1 51,) f IE 1�1E: LOT 73 HUB AND TACK CERTIFICATION / - D„z.r C 'Jl SE 1/4 SEC. 10, T 2 S, R 1 W, W.M. CITY OF TIGARD, WASHINGTON COUNTY, OREGON SURVEYED JUNE 22, 2021 I I I II I PREPARED FOR: DAVID WEEKLEY HOMES 6 PUBLIC SIDEWALK 5 1905 NW 169TH PLACE, SUITE 210 EASEMENT BEAVERTON, OR. 97006 \\<:::_t-- ,- - $ TRACT 'A' i I / o — — — — I j i PRIVATE WATERLINE EASEMENT SW TIERRA TERRACE co N89'53'03"E 73.64' --1 --J ! / ui -�l- o iv Nt PUBLIC UTILITY 1 1 �, EASEMENT d- 0 r' o 3 12 8.50'I3 — 13 "`-10.14' �+1 14 a I I.-. * o PRIVATE WALL � rc, j� o MAINTENANCE EASEMENT I SDP '- O O U f O O c) STORM DRAINAGE Z 1 _I tn s EASEMENT �. f = A o I w �, S — 7 *. r- — — — �- i / a i E REGISTERED S89'52'46"W 73.65' PROFESSIONALI N LAND SURVEYOR TRACT 'B' M r_ OREGON a- JAN. 14, 2020 NICK A. LAFOND / G aa 93484PLS o RENEWS: 12/31/2022 °' 1, NICK A. LAFOND, A REGISTERED PROFESSIONAL LAND SCALE o SURVEYOR IN THE STATE OF OREGON, HEREBY CERTIFY THAT 30 0 15 30 0 1 HAVE ACCURATELY SURVEYED AND STAKED THE 151111nnl. a FOUNDATION FOR LOT 13 OF "TRILLIUM HILL". 1 INCH = 30 FEET 0 0 o o DRAWN BY: JRH DATE: 6/23/21 PACIFIC COMMUNITY DESIGN a REVIEWED BY: NLF DATE: 6/23/21 130-002 PLANNING - ENGINEERING - SURVEYING PROJECT NO.: (503) 941-9484 A% iGrli�r�►.1a GEDPI1CIFIC -IINFIIII7F Real-World Geotechnical Solutions Investigation •Design •Construction Support June 22,2022 Project No. 18-5046 Mr. Elizabeth Morse c/o Kerr Contractors, Inc. PO Box 1060 Woodburn, Oregon 97071 Email: Emorse(a)dwhomes.com SUBJECT: CONCLUSION REGARDING LOW POINT DRAIN OUTLETS LOTS 10-14 TRILLIUM HILL SUBDIVISION TIGARD,OREGON Reference: GeoPacific Engineering, Inc., Geotechnical Engineering Report, Trillium Hill, 15050 and 15100 SW 109th Avenue, Tigard, Oregon, Project No. 18-5046, dated November 15, 2018. This letter addresses the outlet for low point drains and perimeter footing drains for the single- family homes on Lot 10 through 14. There are no known springs on these lots and we do not expect any outflow. The maximum outflow we have seen in our vast experience is 1 gpm; such a small amount that no adverse impacts to adjoining properties are possible. The low point and footing drains should not be connected to the rain drains and may outfall in the rear yard on these lots. No rip rap is considered necessary. c 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, r 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 incorporated into its construction. Adequate crawlspace drainage is not something that geotechnical consultants can verify. Appropriate design professionals should be consulted regarding crawlspace ventilation, building material selection and mold prevention issues, which are outside GeoPacific's area of expertise. We have prepared this report for David Weekley 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. 14835 SW 72nd Avenue Tel (503) 598-8445 Portland, Oregon 97224 Fax(503) 941-9281 Sauer Residence Project No. 17-4458 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. Sincerely, GeoPacific Engineering Inc. PROF,S G�5 NGINEk• r'p � ' R ? 147 r OREGON ✓ g`�° q4123.1 ` MSD.10 EXPIRES:OtY30/202,3 James D. Imbrie, G.E. Project Engineer i II 2 GEOPACIFIC ENGINEERING, INC. GEOPRCIFIC Real-World Geotechnical Solutions Investigation•Design•Construction Support June 29, 2021 Project No. 18-5046 David Weekly Homes 1905 NW 169th Place, Suite 102 Beaverton, Oregon 97006 Phone: 503-213-4408 Email: dmillermovlandwhomes.com FOUNDATION SUBGRADE REVIEW LOT 13—TRILLIUM HILL TIGARD,OREGON This letter addresses the single-family home foundation subgrade on Lot 13. We understand that the proposed building is a two-story home with a crawl space. As part of this evaluation, GeoPacific visited the site today to observe the subgrade foundation preparation. At the time of our site visit, the foundation excavation was complete and extended approximately 6 to 24 inches below existing ground surface. The foundation bearing soils appeared to consist of native silt soils. Probing efforts with a 1/2-inch soil probe resulted in 1 to 2 inches of penetration into the subgrade fill indicating medium stiff to very stiff consistency. The layout of Lot 13 has gentle slope descending toward the rear of the lot. Footing-to-wall and footing-to-slope setbacks appeared to be adequate based on the anticipated layout. Based on observed conditions, foundation subgrades as prepared are considered suitable to support the planned allowable bearing pressure of 1,500 psf. Estimated settlement under the allowable bearing pressure is 1-inch total, and%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 %-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 incorporated into its construction. Adequate crawlspace drainage is not something that geotechnical consultants can verify; the purpose of our visit is for observations of foundation bearing conditions only. 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 GEOPACIFIC Job No. 18-5046 Lot 13 Trillium Hill We have prepared this report for Stonebridge 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. O PRo CI N4GINE�R 4 S,ti 147 PE G Ar ker '/J/ r OREGON ✓9✓44123,1994F. ES0.IM$ - EXPIRES:06/30/2023 James D. lmbrie, G.E. Geotechnical Engineer