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FESIGN= FIELD REPORT
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GDI Project Polygon-129-03 Prepared By: Bret Moskal
Project Name: River Terrace East Date: 2/8/18
Location: SW Scholls Ferry&Roy Rogers,Bvrtn Report#: 197
Arrival: 0845;1300 Departure 1115, 1340
Weather: Overcast, 40's Permit#: TBD
Site Visit Requested By: Ken (Polygon),Spencer(NEI) Met With (on site): Ken (Polygon), Keywest crew
Purpose: Observe lot 67, Wall 21 backfill,and lot 173-175 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-163 Deflection in roadway
FR-177 soft fill from slope cut in lots 153, 154 and 155
*Resolved*
Wall 21
Upon arrival, I observed Keywest crew in the process of placing backfill for wall 21 (see site plan). I was informed
that backfill material was %" minus crushed rock sourced for Baker(Farmington). Compaction efforts were
completed utilizing a large walk behind plate compactor next to the wall and a small smooth drum roller for wall fill.
Using a Troxler 3430 nuclear density gauge, I tested the density of the granular backfill and compared the results
against a lab produced proctor(ASTM D1557)value of 127.2pcf at 13.6 percent optimum moisture content. Areas
tested met or exceeded our compaction recommendations of 95%compaction of maximum dry density value.
Lot 67
While onsite, I observed earthwork crew had prepared subgrade for lot 67.At time of arrival,earthwork crew had
placed a cover approx. 2"of%" minus crushed rock over the subgrade. Using a W diameter steel foundation rod I
probed the lots aggregate base. Probing indicated well-keyed base. Probing through the aggerate base I observed
the underlying subgrade to generally be stiff.
I was informed that earthwork crew had over excavated soft footing subgrade, within area noted on attached site
plan, by approx. 16"to 24". I was informed that crew had backfill excavation with crushed rock in lifts utilizing a
jumping jack compactor. Using a Troxler 3430 nuclear density gauge, I tested the density of the footing granular
pads and compared the results against a field assumed proctor value of 125.0pcf(based on pin resistance and
known dry density range of this material,we believe that this value accurately represents this material to date).
Areas tested met or exceeded our compaction recommendations of 95%compaction of maximum dry density value.
Lots 173-175
While onsite, I observed NEI crew in the process of placing and compacting backfill within excavation for lots 173-
175. I was informed that earthwork crew was using 4" minus recycled concrete material for backfill. Compaction
efforts were completed utilizing a large single drum vibratory pad foot roller in approx. 6" lifts. I observed the pin
resistance (number of blows on a%"diameter pin with a 6-lb hammer to drive pin approx. 12" into material)to
indicated densely compacted backfill. I observed no deflection or rutting under the compactor during compaction
efforts. I observed earthwork crew placed approx. 5' of fill today.
Used on our observations, pin resistance, probing,and testing,areas of wall backfill, excavation backfill for lots
173-175, and lot 67, in areas observed today and noted on attached site plan, have been or are being prepared in
general accordance with our geotechnical recommendations.
9450 SW Commerce Circle,Suite 300 I Wilsonville,OR 97070 1503.968.8787 I www.geodesigninc.com
it
ODESIGNY. FIELD REPORT
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Distribution:
Attachments: Site Plan (2); NDGD(1);
Reviewed by:
Ibis report presents opinions formed as a result of our observation of activities relating to geotechnical engineering orerwirnnrtlental 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 super`cion or direction of the contractor,the contractor's employees
sonatas,Our firm is net responsible for site safety This field report is a DRAFT tepresentat on of our field observations,testing,and+relimmary recommendations.The art can only be
considered final upon review of the Ceofesign project mariner,es indicated by IOWAN in dre"Reileewed B?wools
Signature: ..„Pr;',"
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9450 SW Commerce Circle,Suite 300 I Wilsonville,OR 97070 1503.968.8787 I www.geodesigninc.com