Report Aug •
05.2003 GeoPacific Engineering, •I 503 - 598 -8705 p.1 —7
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GeoP
Engineering, Inc.
7312 SW Durham Road
Portland, Oregon 97224
Tel (503) 5988446 • Fax (603) 598.8705
August 5, 2003
Project No. 99 -2791
D.R. Horton
5125 SW Macadam Ave. Ste 145
Portland, OR 97201
Fax No. (503)579 -6002
Attention: Emery Smith
GEOTECHNICAL REVIEW OF FOUNDATION EXCAVATIONS
Pacific Crest — Lots 54 through 56, and 64
City of Tigard, Oregon
At your request, GeoPacific Engineer, Jim Imbrie, arrived on site on August 4` ", 2003 to review the
foundation excavation subgrade on the above - referenced lots. The lots exposed mostly dry, stiff
native soils and were excavated through most of the roadway embankment slope. The front of the
excavation on Lots 54 through 56 exposed some compacted reject rock embankment fill. A tall
retaining wall is proposed on these three lots in the middle of the home. The Interior of the
crawispace below these walls is planned to backfilled. The backfilling may be performed provided
the backfill is adequately compacted, drained, and laterally supported with engineered retaining
walls or slope embankments. •
In our opinion, the exposed subgrades are currently suitable for spread foundation support to an
allowable bearing pressure of 1,500 psf. Continuously horizontal steel reinforcing should be
incorporated In all wall footings; minimum of two No. 4 in footing and one in stem wall. The rear
footing-to-slope setbacks appear to be more than adequate at a minimum 8 feet horizontal. The
interior steps appear to be appropriately placed so as not to influence wall footings located above such
steps. Pad footings may need to be deepened or a retaining wall constructed below if they are within
a 1 H:1 V plane of an unsupported cut.
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This review was performed to the local standards of practice for geotechnical engineering. If you have
any questions, please call.
Sincerely,
GeoPacific Engineering, Inc.
oaf) PROFe
et 14743
James D. lmbrie, P.E.
Geotechnical Engineer OREGON
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