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HELD REPORT
Page 1 of 6
GDI Project: Polygon-129-03 Prepared By: Jonathan Tree
Project Names River Terrace East
_Ma Date: 3/20/18
Location: SW Scholls Ferry&Roy Rogers, Bvrtn. Report#: 214
Arrival: 0945
Departure: 1230
Weather: Sunny, 45 degrees Permit* TBD
Site Visit Requested By: Ken (Polygon)yg Met With (on site): Eduardo
(Mainstream Landscaping)
Purpose: Observe lot 92 subgrade, observe backfill along walls north of lots and DT of lot 200
wall backfill
Outstanding Issues: Proof roll road and curb base rock and repair as needed before paving
FR-58 (12/06) Decommission temporary storm and sewer lines through Tract E
FR-177 soft fill from slope cut in lots 153, 154 and 155
Lot 92-Spbra e
I observed crews had excavated to various planned subgrade elevations and placed approx. 2"of 4"-0 crushed rock
compacted with a small walk behind vibratory smooth plate. Using a%z " diameter steel foundation probe, I assessed
the relative consistency of the brown SILT with sand subgrade. Based on 12-inch to 18-inch penetration under full
body weight, the subgrade consistency was medium stiff to stiff. One area approximately 4 feet in width was soft to
.hedium stiff and pumped u:ider fo. z pressure.The excavators on site removed the soft material anc; replaced it
with on-site gravel. The gravel was compacted using a small walk behind vibratory smooth plate.After probing the
repaired area, the subgrade was medium stiff to stiff based on penetration of the Y2" steel foundation probe.
Based on probing of the subgrade at lot 92, the lot subgrade has been prepared in general accordance with our
geotechnical recommendations.
Wail backfill on northern side of lots 200 to 206
While on-site, I spoke with Eduardo with Mainstream Landscaping. The crew with Mainstream Landscaping are
constructing the stone brick retaining walls that were observed today. I observed the backfill CR sourced from Baker
(Farmington)%"-0 that had been placed in approx. 4"lifts and compacted with a TORO FP3000 walk behind gas
vibratory smooth plate compactor according to Eduardo from Mainstream. Eduardo also informed me that the
STRATA SG350 Geotextile Fabric(six feet wide)were rolled perpendicular to the axis of the wall at 16-inches of
crushed rock(CR) increments (see attached photo of exposed geotextile fabric for example). The manufacturer of
the geotextile fabric instructed Eduardo from Mainstream Landscaping to not overlap the fabrics along the edges of
two sheets(see attached photo).
The top soil that covered the backfill had been pot holed to a depth of approx. one to two feet bgs for observation
of the final CR backfill lift(see photo attached). Total CR backfill depths measure approximately four to five feet.
Based on penetration of a%z " diameter steel probe, the upper 12 inches of the backfill had a relative density of
loose to medium dense.
iJ used a Troxler 3430 nuclear density gauge to evaluate compaction of the top lift of CR wall backfill on the northern
end of lot 200 (see attached photo). The measured maximum density of two tests measured 87.5%pcf at 7.1 %
9450 SW Commerce Circle,Suite 300 I Wilsonville,OR 97070 1503.968.8787 I www.geodesigninc.com
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=DESIGN_ FIELD REPORT
Page 2 of 6
moisture and 83.1%pcf at 6.5%moisture (see attached NDDS). I recommended that Mainstream wet the CR and
recompact and that the current level of compaction as measured does not meet our geotechnical recommendations.
Before leaving the site, I spoke with Eduardo to inform him that the project manager(Shawn Dimke; Geodesign Inc.)
would like to density test the bottom two to three feet base of CR backfill and the final top two to three feet of every
wall constructed in the future to ensure that the crushed rock backfill behind walls is in general accordance with our
geotechnical recommendations.This was also communicated to Tom from Polygon Homes via phone call after
leaving the site.
Distribution:
Attachments: Site Plan (1); Photos
Reviewed by:
This report presents opinions formed as a result of our observation of activities relating to geotechnical engineering or environmental services.We rely 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 include supervision or direction of the contractor,the contractor's employees
or agents.Our firm is not responsible for site safety,This field report is a DRAFT representation of our field observations,testing,and preliminary reconinwndati=,a report can only be
considered final upon review of the GeoDesign project manager,as indicated by initials in the"Reviewed By.section.;
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9450 SW Commerce Circle,Suite 300 I Wilsonville,OR 97070 1503.968.8787 I www.geodesigninc.com
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/- "RIVER TERRACE EAST"
LOT 92 6 Lo 6 vv,tdo oLtIL, 5 .1--
HUB AND TACK CFRTIFICATION
NE & SE 1/4- SEC, 6, T 2 S, R 1 W, VV.M.
CITY OF TIGARD, WASHINGTON COUNTY, OREGON
SURVEYED MARCH 13, 2018
PREPARED FOR:
POLYGON NORTHWEST COMPANY SW SNOWDALE STREET
703 BROADWAY ST., SUITE 510
VANCOUVER, WA. 98660 _ — _ — _
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.g. I, TRAVIS C. JANSEN, A REGISTERED PROFESSIONAL LAND SCALE
t SURVEYOR IN THE STATE OF OREGON, HEREBY CERTIFY THAT 20 0 10 20
° I HAVE ACCURATELY SURVEYED AND STAKED THE OFFSETS
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5 TO THE FOUNDATION ENVELOPE FOR LOT 92 OF THE PLAT i INCH = 20 FE i
"g. OF "RIVER TERRACE EAST".
DRAWN BY: FAA DATE: 3/15/18
PACIFIC COMMUNITY DESIGN
1;-- REVIEWED BY: TCJ DATE: 3/15/18
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Z PLANNING - ENGINEERING - SURVEYING
PROJECT NO.: 3-95-°41
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