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ftV 5 . FIELD REPORT
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Project: NewHome-5-02 Prepared By: Inna Gergalo
Project Name: River Terrace Town Center Date: 10/24/23
Location: SW Roy Rogers Road Report#: 126
Tigard, Oregon
Arrival: 1 100 Departure: 1 145
Weather: Rainy, 60s Permit#:
Site Visit Requested By: Frank (New Home) Met With (on-site): Frank (New Home), Elite
Excavation crew
Purpose: Lot Subgrade
Outstanding Issues:
Lot Subgrade
Upon arrival, I evaluated the subgrade for lots 78 and 94. I probed the exposed subgrade using a%2-inch-
diameter steel foundation probe. Exposed subgrade visually consisted of brown silt covered by approximately 2-3
inches of%"-0 crushed rock. Resulting penetrations indicated the exposed subgrade at probed locations is medium
stiff to stiff.
Storm/Sanitary Trench Backfill
Elite Excavation crew informed me that they placed approximately 24" of%"-0 crushed rock to backfill the
storm and sanitary trench for Lot 78. The crushed rock was sourced from Knife River (Farmington) and
compaction was done via large diesel plate. I used a Troxler 3430 nuclear density gauge to evaluate
compaction. Density tests were compared to a proctor value of 127.2 pcf at an optimum moisture content of
11.5%, determined in our soil lab in general accordance with ASTM D1 557. Tested location met the minimum
compaction recommendations.
Conclusion
Based on our observations, density testing, and probing, it is our opinion that subgrade and trench backfill
observed today, as indicated on the attached site plan, have been prepared in general accordance with project
requirements and our geotechnical recommendations.
Distribution:
Attachments: Site plan (1), NDGD(1)
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 recommendations. The report can only be
considered final upon review of the NVS project manager,as indicated by initials in the"Reviewed By"section.
/, , D
Signature:
9450 SW Commerce Circle,Suite 300 I Wilsonville
,OR 97070 1503.968.8787 I www.nv5.com
NewHome-5-02 FR-126 10/24/2023
saw = Lot Subgrade Observed
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mii = Sanitary/Storm Trench Backfill --.,,
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NV 5 NUCLEAR DENSITY GAUGE DATA •
Project: NewHome-5-02 Project Name: River Terrace Town Center Date: 1 0/24/2023
Sampled By: ipg Project Location: SW Roy Rogers Rd, Tigard, Oregon
Material Source Maximum Density: pcf(required) Optimum Moisture
A Import Silt - River Terrace Dev. A 1 1 3.9 pcf(ASTM DI 557) A 14.2%
B 3/4"-0 C.R. (Farmington.) B 1 27.2 pcf(ASTM D1557) B 11.5%
C 3/4"-0 C.R. (Farmington.) C 122.1 pcf(ASTM D698) C 11.4%
*Depth to final grade (ft)
Test Date Location Elevation* Fill Type Compactor Density % Moisture No. Maximum Required
1 10/24 Storm/Sanitary Trench Backfill - see site plan 0 B Diesel plate 125.0 8.0 98% 95%
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