4302 RIVERFRONT BLVD 2019-03-14 - Laserfiche WebLink

C 1 rn7_n Lori- 103 Project Name: Everett River Front Simpson Report: 103 GeoDesign#: ` Polygon-127-01 Date: 8/03/2016 Reports with Unresolved Nonconformance Issues: Permit: P W 1505-005 DFR 052 • Nick Abdelnour(Polygon) Randy Allen(City of Everett) Weather: Clear, 60's Ron Bowen(Polygon) Eddy Stevens(Polygon) I Arrival/Departure: 1130/1530 Distribution: Doug Ross(Polygon) Kirk Keck(City of Everett) Paul McKee(City of Everett) Dave Foster(City of Everett) Prepared By: Ben Weinberg, E.I.T. Attachments: ' m Site Plan(s) m Density Test Summary Signature ❑ Installation Records ❑ Other Reviewed By: 72,Z"_ PURPOSE of VISIT: GeoDesign representative, Ben Weinberg, was on-site at the request of Eddy Stevens with Polygon to observe foundation subgrade for Lots 103, 130, and 131. SUMMARY of OBSERVATIONS: Lot 103: GeoDesign noted that the foundation excavation subcontractor had completed the footing and crawl space excavation prior to his arrival on-site. GeoDesign noted that the north, east, and south sides of the perimeter foundation generally consisted of a brown silty SAND (f-m)with gravel (f-c) which could be penetrated from 1 to 3 inches using a 1/2 inch diameter soil probe under the full weight of the user; in-place density tests taken on the north, east,and south side indicated that the material had been compacted to greater than 95%of its maximum dry density as determined by a Modified Proctor analysis. GeoDesign had previously noted that the west side of Lot 103 had consisted of a gray-brown silty SAND (f-m)with gravel (f-c) which could be probed approximately 18 inches using a 1/2 inch diameter soi probe; GeoDesign recommended that the perimeter footing area along the west side of Lot 103 be over-excavated 1 foot, exposed soil compacted to greater than 95%of its maximum dry density, and backfilled to foundation subgrade with material compacted to greater than 95%of its maximum dry density.The contractor elected to over-excavate the west perimeter footing of Lot 103 approximately 2 feet and replace with a 2-inch clean crushed rock material. In-place density tests taken at the base of the over-excavated area indicated that the exposed material had been compacted to greater than 95%of its maximum dry density as determined by a Modified Proctor analysis. GeoDesign also noted that the over-excavated area was backfilled in approximately 1 foot lifts using the 2-inch clean crushed rock tampled into a firm and unyielding mass using the bucket of an excavator and compacted using a standard walk-behind plate compactor. It is the opinion of GeoDesign that the exposed foundation subgrade is currently suitable for support of the intended load. GeoDesign recommends that any surficially loose and/or saturated material be removed from the base of the footings prior to the placement of concrete. Lot 130: GeoDesign noted that the foundation excavation subcontractor had completed the footing and crawl space excavation prior to his arrival on-site. GeoDesign noted that exposed foundation subgrade generally consisted of a brown silty SAND (f-m)with gravel (f-c)which could be penetrated generally less than 1 inch using a 1/2 inch diameter soil probe under the full weight of the user; in-place density tests taken on the four sides of the foundation area indicated that the material had been compacted to greater than 95% of its maximum dry density as determined by a Modified Proctor analysis. GeoDesign noted an approximately 15 feet long section on the west end of the south side and 15 feet long section along the south end of the west side which could be probed approximately 18 inches using a 1/2 inch diameter soil probe; GeoDesign recommended that the material be over-excavated 2 feet and replaced with material compacted to greater than 95%of its maximum dry density as determined by a Modified Proctor analysis;the contractor elected to backfill the over-excavated areas with a 2-inch clean crushed rock material tamped into a firm and unyielding mass using an excavator and a standard sled compactor. This report presents opinions formed as a result of cur 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.Ou-work does not include supervision or direction of the contractor,the contractor's employees or agents. Our firm.is not responsible for sire 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 indicated 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