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Report P1S a©,c, - Oo.SL/ 1L1C13 `-1 sw J3CI ULI 'Z L- T SETBACK REQUIREMENTS: FOUNDATION CERTIFICATION FRONT: 15 FEET FRONT GARAGE: 20 FEET LOT 9 OF "ELDERBERRY RIDGE" SIDE: 5 FEET WASHINGTON COUNTY, OREGON REAR: 15 FEET DATE: FEBRUARY 20, 2020 'TRACT B' i S00'54'49"W 41.00' o SCALE 1" = 20 FEET N SETBACK UNE-- E 1 (TYPICAL) o CO CM CO 1 P.U.E. PUBUC UTILITY EASEMENT P.S.D.E. PRIVATE STORM SEWER EASEMENT $ I 8 irs LOT 10 W ' LOT 8 i LOT 9 3 I, CLINTON H. STUBBS JR., A REGISTERED 1n i n PROFESSIONAL LAND SURVEYOR IN THE STATE i OF OREGON, HEREBY CERTIFY THAT I HAVE com ' i z ACCURATELY SURVEYED AND MAPPED THE 6.0 , FOUNDATION FOR LOT 9 OF "ELDERBERRY -- i 5.0' RIDGE", AS STAKED ON FEBRUARY 20, 2020. a: i THE BOUNDARY LINES DEPICTED HEREON WERE o ESTABLISHED BY HOLDING RECORD INFORMATION L - - - - oi - - - _I AND MONUMENTATION FROM THE PLAT OF SAID I SUBDIVISION, THIS CERTIFICATION SHOULD NOT _ SERVE AS A BOUNDARY SURVEY. 1 0 `'n" REGISTERED - r - - PROFESSIONAL LAND SURVEYOR f } N01'52'05"E 40.31' 1 L1 „ ;‘,,K SW BELVIOR COURT OREGON iri JANUARY 15, 2002 CUNTON H. STUBBS JR. 55469LS RENEWS: 06/30/20 PREPARED FOR: JOB NAME: ELDERBERRY RIDGE RIVERSIDE HOMES, LLC. JOB NUMBER: 1884 I\i ORTHWEST 1815 NW 169th PLACE, SUITE 2090 17933 NW EVERGREEN PLACE DRAWING NUMBER: 1884 STAKED BEAVERTON, OR 97006 SUITE 370 PHONE:503-848-2127 - BEAVERTON, OR 97006 DRAWN BY: BJA SURVEYING, Inc. nwFAsurvX:eyingOnw503-848srvy.c2179om CHECKED BY: CHS ✓11ST.20 - Dc'2Sv Ic-( g3cf s( r3etvo( . cT GeoPacific Engineering,Inc. Real-World Geotechnical Solutions Investigation • Design•Construction Support February 23, 2020 GeoPacific Project No. 15-4010 Riverside Homes, LLC 17933 NW Evergreen Parkway, Suite 370 Beaverton, OR 97006 Via email to Brett Groves (BGroves@riversidehome.com) and Amilian Avgi (AAvgi@riversidehome.com) Subject: GEOTECHNICAL OBSERVATION OF FOUNDATION SUBGRADE ELDERBERRY RIDGE SUBDIVISION-LOT 9 14934 S.W. BELVOIR COURT TIGARD,OREGON GeoPacific Engineering, Inc. (GeoPacific) conducted on-call density testing and construction observation services for the Elderberry Ridge Subdivision site. This letter addresses the footing subgrade conditions for Lot 9 of the development. It is our understanding that the planned structure will consist of a single-family residence utilizing conventional spread footings. GeoPacific personnel visited the site February 19th to the 21st, 2019 to observe subgrade preparation for the foundation excavation at Lot 9. The excavation depth was approximately 12- 60 inches below the surrounding grade. The foundation bearing soils consisted of engineered fill soils, which were evaluated with a hand probe. Probing efforts indicated predominantly stiff soils throughout the footing subgrade layout. The footing layout of Lot 9 and the adjacent lots is a relatively flat pad with a 12-foot tall, 2H:1V slope downward at the east side of the pad. Footing-to-slope and footing-to-wall setbacks were adequate at more than 5 feet horizontal. Some sloughing of vertical cuts is anticipated and will need to be mucked/removed. The deck footings on the slope will require backfilling with compacted structural fill consisting of crushed aggregate. Based on observed conditions, the footing subgrade soils are considered suitable for foundation support. The foundation subgrade as prepared is 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 '/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 %-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 14835 SW 72nd Avenue Tel (503) 598-8445 Portland, Oregon 97224 Fax(503)941-9281 Elderberry Ridge - Lot 9 GeoPacific Project No. 15-4010 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. We have prepared this report for Riverside 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. }`R S, , .. L. 147 % / ORE(:OI'f,, 1 EXPIRES:06/30/29Z1 James D. Imbrie, G.E., C.E.G. Principal Geotechnical Engineer 2 GEOPACIFIC ENGINEERING, INC