Report Asr-2020-0 I 3C 1201 a 56v VcaNcievt�-�-
HARDMAN
4,4444 GEOTECHNICAL
SERVICES INC.
Practical.Cost-Effective Geotechnical Solutions
June 3,2020
HGSI Project No. 20-2582
Eric W. Lee
Odyssey Development LLC
9933 SW Morrison Street
Portland, OR 97225
503-730-2760
Odyssey37@comcast.net
comcast.net
Via e-mail with hard copies mailed on request
Subject: FOUNDATION EXCAVATION REVIEW
ASPEN RIDGE LOT 3
12010 SW VIEWCREST COURT
TIGARD,OREGON
As requested, Hardman Geotechnical Services Inc. (HGSI)visited the site on May 29, 2020 to
observe soil preparation and final soil foundation bearing conditions for the new house being
constructed at Lot 3 of the Aspen Ridge development. The address is 12010 SW Viewcrest Court
Tigard, Oregon.
Foundation excavation was essentially complete at the time of our site visit. The lot is gently
sloping down to the west, and the excavation extended roughly 1 to 2.5 feet below surrounding
grades. Materials at foundation subgrade level consist weathered rock and residual soil. There are
reddish brown and grey mottles observed in the material, consistent with native soil conditions in
the area. Upon observation of the subgrade in several areas with a half inch steel hand"T" probe,
the material observed was stiff to very stiff. No setback issues were observed at the time of our
visit.
Foundation bearing soils were evaluated using a steel "T" probe. The materials encountered at
footing subgrade elevations are considered suitable for foundation support. Foundation subgrades
prepared as recommended herein are considered suitable to support an allowable bearing pressure of
2,000 psf. Estimated settlement under the allowable bearing pressure is 1-inch total, and 'A 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 about 'A inch of loose soils are present prior
to pouring concrete.
10110 SW Nimbus Avenue,Suite B-5 Tel(503)530-8076
Portland,Oregon 97223 www.hgsirocks.com
x �
June 3,2020
HGSI Project No. 20-2582
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. Appropriate design professionals should be
consulted regarding crawlspace ventilation, building material selection, radon and mold prevention
issues, which are outside HGSI's area of expertise.
We have prepared this report for Odyssey Development and it should not be relied upon by third
parties without consulting HGSI. Within the limitations of scope, schedule and budget, HGSI
executed these services in accordance with generally accepted professional principles and practices
in the field of geotechnical engineering 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.
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We appreciate this opportunity to be of service.
Sincerely,
HARDMAN GEOTECHNICAL SERVICES INC.
6 2P r'
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'SABER
L. HA
EXPIRES: 06-30-2012A
Scott L. Hardman, P.E., G.E.
Geotechnical Engineer
20-2582-Aspen Ridge Lot 3 fnd ry Dr 2 HARDMAN GEOTECHNICAL SERVICES INC.