4228 RIVERFRONT BLVD 2019-03-14 - Laserfiche WebLink

C ito7-vi1? y- 313024 6r Of Project Name: Everett River Front-Simpson Report: 100 GeoDesign#: J Polygon-127-01 Date: 7/28/2016 Reports with Unresolved Nonconformance Issues: Permit: DFR 052 PW1505-005 Nick Abdelnour(Polygon) Randy Allen(City of Everett) Weather:Sunny, 70's i Ron Bowen(Polygon) Arrival/Departure: 0830/1700 Distribution Doug Ross(Polygon) Paul McKee(City of Everett) Prepared By: Ben Weinberg, E.I.T. Attachments: m Site Plan(s) m Density Test Summary 3 Signature: ❑ Installation Records ❑ Other Reviewed By: PURPOSE of VISIT: GeoDesign representative, Ben Weinberg, was on-site at the request of Eddy Stevens with Polygon to observe foundation subgrade for Lot 104. SUMMARY of OBSERVATIONS: Lot 104: GeoDesign noted that the foundation subcontractor had excavated the footing and crawl space areas for Lot 104 prior to his arrival on-site. GeoDesign noted that the exposed footing subgrade consisted of a brown and gray silty SAND (f-m)with gravel (f-c)that had been exposed using a flat-edge excavator bucket and grade blade. The exposed foundation subgrade was evaluated using a 1/2 inch diameter soil probe and a Troxler Moisture-Density gauge. Penetration depths encountered ranged from 1 to 4 inches and in-place density tests indicated that the material had been compacted to greater than 95%of its maximum dry density as determined by a Modified Proctor analysis. A summary of our observations and density tests taken today can be found in the attached Nuclear Density Gauge Data and Figure 1. It is the opinion of GeoDesign that the exposed foundation subgrade observed today was currently suitable for support of the intended foundation load. GeoDesign recommends that any loose and saturated material be removed from the base of the foundation prior to the placement of concrete. Other Foundation Excavation Activity: GeoDesign also noted that foundation excavation subcontractor was in the process of excavating the footing and crawl space areas for Lots 105 and 106. For Lot 105,GeoDesign noted areas along the west and south perimeter that would not meet project compaction requirements. For Lot 106,GeoDesign noted areas along the north, west,and south perimeter that would not meet project compaction requirements. For the above-mentioned areas,which were clearly marked with orange spray paint, GeoDesign recommended over-excavating the footing areas 1 foot, recompacting the exposed surface to greater than 95%of its maximum dry density as determined by a Modified Proctor analysis(maximum dry density),and backfilling back to footing subgrade with material compacted to greater than 95%of its maximum dry density. After over-excavating approximately 1 foot of material from the above-mentioned footing areas,GeoDesign noted that the exposed material material appeared to be wet of its optimum moisture content and would not currently be able to be compacted to greater than 95%of its maximum dry density as determined by a Modified Proctor analysis. GeoDesign recommended over-excavating the footing areas to 2 feet below planned footing subgrade and backfilling the areas with structural fill. GeoDesign noted that the exposed material at the base of the over-excavated areas consisted of a brown and dark gray silty SAND with gravel that could be probed from 1 to 4 inches. The contractor elected to backfill the foundation excavations with a 2=inch clean crushed rock. GeoDesign recommended that the material be placed in maximum 1 foot loose lifts and compacted into a firm and unyielding mass using suitable compaction equipment; it is GeoDesign's understanding that the 2-inch clean crushed rock material will be placed in 1 foot max loose lifts and compacted into a firm and unyielding mass using the bucket of the excavator and a walk-behind plate compactor. 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 GeoDesign project manager,as ind;cated by initials in the"Reviewed By"section, 10700 Meridian Avenue North,Suite 210 I Seattle,WA 98133 I 206.838.9900 2502 Jefferson Avenue I Tacoma,WA 98402 I 253.203.0095