Report (61) Yv-cr - rS '
GEODESIGN= FIELD REPORT
Page 1 of l°
.... je t __.._ .__.. ! Prepared By: Daniel Stai
GDI ProPolygon-129-03 mm ° ° rr
Project Name: River Terrace East Date: 1/23/18
Location: I SW Scholls Ferry&Roy Rogers, Bvrtn. Report#: 186 Revised
Arrival: 1050 Departure: 1205 _.__.
Weather: Rainy, 50's Permit#: TBD
Site Visit Requested By: Ken w/Polygon .._. Met With (on site): Ken (via phone)
Purpose: Observe Subgrade for Lots 72 and 73
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-163 Deflection in roadway
FR-177 soft fill from slope cut in lots 153, 154 and 155
Lots 72 and 73
Contractor had excavated lot 73 to grade and was in the process of excavating lot 72. Contractor had excavated the
tiered footings next to the road on the north sides of each lot. Excavator said that they had excavated out 18 to 30
inches of soft soil on the northern most footing tier for each lot. They were using % inch minus crushed rock to
backfill to finished grade and a jumping jack in small lifts for compaction. Crushed rock was generally dense when
prodded with a/2 inch diameter steel "T" probe. I was able to penetrate up to 6 inches for part of the fill rock in lot
73 and I asked them to recompact this location.
Contractor was covering newly cut subgrade with 1 to 2 inches of loose crushed rock. I recommended that this rock
be keyed in using a plate compactor before it becomes saturated with rain. Subgrade soil generally appeared to
consist of brown silt. There was some silty gravel fill located on the northeast corner of lot 73. Probing through the
crushed rock, the subgrade was generally observed to be stiff to medium stiff with penetrations under full body
weight between 4 and 18 inches. I observed organics and discolored soil in the subgrade of one of the tiers in lot
72. I asked contractor to pot hole down 6 inches. Discoloration ceased after 6 inches and was likely the old tilled
zone. I did observe a few roots in the subgrade which were pulled out by the excavator. Excavator plans to place %4
inch minus crushed rock back to finished grade and compact via plate compactor.
I was unable to observe the rest of lot 72 as the excavator was still cutting the southern half out.
Based on our observations the subgrade for Lot 73 has been prepared in accordance with out geotechnical recommendations.
We plan to return later to observe the remainder of the Lot 72 subgrade.
Distribution:
Attachments: Site Plan (1)
Reviewed by: SM'D
This report presents opinions formed as a result of our observation of activities relating to geotechnical engineering or environment, • °,•s.We rely on the contra or to "ply r+ and
specifications throughout the duration of the project irrespective of the presence of our representative. Our work does not ind +.superviuion or direction of ther.ttrac., c* 4100e%gimp y'$e5
or agents Our firm is not responsible for site safety. This field report Is a DRAFT representation of our field observations, a °>+,and preliminary recomn nda,`+ report .is only be
considered final upon review of the GeoDesign project manager,as indicated by initials in the"Reviewed Br section. Ilk a
Signature: ..._...._. _�. ._ .......�_
9450 SW Commerce Circle,Suite 300 I Wilsonville,OR 97070 1503.968.8787 I www.geodeslgninc.com
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LOT 73
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HUB AND TACK CERTIFICATION
NE ek SE 1/4 SEC. 6, T 2 5, R 1 W, W.M. .
CITY OF TIGARD, WASHINGTON COUNTY, OREGON i
SURVEYED DECEMBER 26, 2017
PREPARED FOR:
POLYGON NORTHWEST COMPANY SW LARKSPRING ST
703 BROADWAY ST., SUITE 510
VANCOUVER, WA. 98660
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TRAVIS C.JANSEN '989•58 43n E 59.97 I .
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0 RENEWS:6/30/2019 1 '
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...c. I, TRAVIS C. JANSEN, A REGISTERED PROFESSIONAL LAND SCALE
g SURVEYOR IN THE STATE OF OREGON, HEREBY CERTIFY THAT 20 0 10 20
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0 I HAVE ACCURA ILLY SURVEYED AND STAKED THE OFFSETS 1116111115111111111111111111111111111M
c3. TO THE FOUNDATION ENVELOPE FOR LOT 73 OF THE PLAT 1 INCH = 20 FEET
OF "RIVER TERRACE EAST".
% T2 DATE: 1/19/18
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.-- DRAWN BY: PACIFIC COMMUNITY DESIGN
_
REVIEWED BY:
TCJ DATE:
-..L..3- 1/19/18
z.'• PLANNING - ENGINEERING - SURVEYING
PROJECT NO.: 395-041
(503) 941-9484
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