Report i
C707, 724crr e-t-s 42
G EODESIGNY FIELD REPORT
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GDI Project: Polygon-122-04 Prepared By: Dan Boileau
Project Name: Polygon at Bull Mountain Date: 4/20/16
Location: SW 1 50th Avenue and SW Hawk Report#: 103
Ridge Road, Tigard, OR
Arrival: 0830 Departure: 1030
Weather: Sun, 70s Permit#:
Site Visit y Requested B : Jason with Polygon Met With (on site):
q yg Jason
Purpose: Observe footing subgrade Lots 63, 64 and 65 ... ..,, _...,,
Outstanding Issues: FR-97 (3/17)Soft spots on Hawk Ridge Rd during paving, low density values
FR-103 (4/20)Soft subgrade/roots footing subgrade
Upon arrival, I observed crews had placed forms and rebar over exposed subgrade. Subgrade had been overlain by
approx. 1"of loose crushed rock. I used a1/2"diameter steel foundation probe to evaluate brown silt subgrade
through /next to forms. Resistance to penetration generally indicates medium-stiff subgrade conditions.
Observations of lot subgrades are as follows:
Lot 63- Probes generally medium-stiff. Western section of northern continuous footing (see site plan) probes soft up
to 12".
Lot 64- Probes generally medium-stiff. Roots observed ranging in diameter from 1/8th inch to approx. 4". I observed
crews cut roots to be level with current grade while I was onsite. I used a shovel to remove crushed rock layer to
expose some of the pad footing subgrade, minimal surficial roots were observed. I observed roots ranging in
diameter from 1"to 4"within footing subgrade in central wall section. We recommend removal of these roots under
footing resulting in an over excavation not exceeding 18" below current grade. Excavation should be backfilled in
accordance with the"Structural Fill"section of our Geotechnical Report. Two areas on the north and south of the pad
probed soft(see site plan).
Lot 65- Partially formed for concrete during my visit. I observed three areas (see site plan)where resistance to
penetration indicates soft subgrade.
We understand areas not within continuous footing or pad footings are going to be non-Ioadbearing crawl spaces.
Based on probing, we recommend one of the three following courses of action be taken in identified soft subgraden
areas: 1/
o v.v.Ack
1. Geo Design observe potholes next to soft footing areas to observe S-utogracie conditions.
2. Over-excavate areas 6"and backfill with compacted structural fill.
3. Over-excavate areas 6"and fill excavation with concrete during footing pour.
We recommend Geo Design be notified to re-observe soft footing areas identified today prior to footing pour.
Based on our observations and probing, footing subgrade areas observed today(excluding aforementioned root
removal and soft subgrade areas) have been prepared in general accordance with project specifications and our
geotechnical recommendations.
15575 SW Sequoia Parkway,Suite 100 I Portland,OR 97224 I Off 503.968.8787 I Fax 503.968.3068
GEODESIGN.V FIELD REPORT
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Distribution:
Attachments: Site Plan (1), Photos (4)
Reviewed by: Z;
This report presents opinions formed as a result of our observation of activities relating to geotechnical engineering or environmental services We ref,/on the contractor to comply with the plans and
specifications throughout the duration of the project irrespective of the presence of our representative. Our work does not indu su or direction Odle contractor,the contractor's employees
or agents. Our firm Is not responsible for site safety.This field report Is a DRAFT representation of or field observations.t iminary recommendations.The report can only be
considered final upon review of the GeoDesign project manager,as indicated by initials in the"Reviewed By"section.
Signature:
•
•
Photo 1: Lot 65 facing southeast as observed today,
15575 SW Sequoia Parkway,Suite 100 I Portland,OR 97224 I Off 503.968.8787 I fax 503.968.3068
G EODESIGN-z FIELD REPORT
. , , ""` ' l 1 Page 3 of 4
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Photo 2: Lot 64 as 7bs ,7vedsn oarrival facing northwest.
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Photo 3: Lot 64 facing northeast as observed upon arrival.
15575 SW Sequoia Parkway,Suite 100 I Portland,OR 97224 I Off 503.968.8787 I Fax 503.968.3068
GEODESIGN� FIELD REPORT
Page 4 of 4
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Photo 4: Lot 64 pad footing, typical subgrade observed.
15575 SW Sequoia Parkway,Suite 100 I Portland,OR 97224 I Off 503.968.8787 I Fax 503.968.3068
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