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SETBACK REQUIREMENTS:FRONT GARAGE: 20 FEET* FOUNDATION CERTIFICATION
FRONT HOUSE: 15 FEET*
SIDE 5 FEET LOT 10 OF "ELDERBERRY RIDGE"
SIDE: 5 FEET
REAR: FEET
WASHINGTON COUNTY, OREGON
15
DATE: MARCH 2, 2020
•(FRONT SETBACKS MEASURED FROM
THE SIDEWALK)
'TRACT B'
S00'54'49'W 40.00'
• i •
SCALE 1" = 20 FEET
0
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N. (TYPICAL)
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m
m $ I, CUNTON H. STUBBS JR., A REGISTERED
;" PROFESSIONAL LAND SURVEYOR IN THE STATE
1 LOT 9 OF OREGON, HEREBY CERTIFY THAT I HAVE
p LOT 0 17, ACCURATELY SURVEYED AND MAPPED THE
rn Q
op FOUNDATION FOR LOT 10 OF "ELDERBERRY
Z RIDGE', AS STAKED ON FEBRUARY 28, 2020.
THE BOUNDARY UNES DEPICTED HEREON WERE
5.0'--- — 5,0' ESTABLISHED BY HOLDING RECORD INFORMATION
44 AND MONUMENTATION FROM THE PLAT OF SAID
t` \ \ a: SUBDIVISION, THIS CERTIFICATION SHOULD NOT
L I J o SERVE AS A BOUNDARY SURVEY.
o
ci
r-- `v i REGISTERED
1 i PROFESSIONAL
LAND SURVEYOR
• 1 1
R=9.53 N00'S4'49'E 30.75' w.. // OREGON
JANUARY 15, 2002
ui SW BELVIOR COURT
c CUNTO H.55469LSSTUBBS JR.
v' RENEWS: 06/30/20
PREPARED FOR: JOB NAME: ELDERBERRY RIDGE
JOB NUMBER: 1884 11 ORTHWEST 1815 NW 169th PLACE,
RIVERSIDE HOMES, UC. SUITE 2090
17933 NW EVERGREEN PLACE DRAWING NUMBER: 1884 CERT BEAVERTON, OR 97006
SUITE 370 PHONE:503-848-2127
BEAVERTON, OR 97006 DRAWN BY: BJA 0 URVEYING, AX:503-848-2179
Inc.. nwaurveyingOnwarvy.com
CHECKED BY: CHS
GooPicific
Engineering.$nc.
Real-World Geotechnical Solutions
Investigation • Design• Construction Support
February 29, 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 Amiiian Avgi
(AAvgi@riversidehome.com)
Subject: GEOTECHNICAL OBSERVATION OF FOUNDATION SUBGRADE
ELDERBERRY RIDGE SUBDIVISION—LOT 10
14924 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 10. 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 27" to the 29', 2019 to observe subgrade
preparation for the foundation excavation. 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 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 '/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
14835 SW 72nd Avenue Tel(503) 598-8445
Portland, Oregon 97224 Fax(503) 941-9281
r
Elderberry Ridge - Lot 10
GeoPacific Project No. 15-4010
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.
`L)5 IN:'�` DREG,N r
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'1 S D.
EXPIRES:06/30/20 2_(
James D. Imbrie, G.E., C.E.G.
Principal Geotechnical Engineer
2 GEOPACIFIC ENGINEERING, INC.