4501 30TH DR SE 2018-12-28 - Laserfiche WebLink

GEO ESIGNz FIELD REPORT 1 of 4 Project Name: Everett River Front-Simpson Report 065 GeoDesign#: Polygon-127-03 Date: 07/31/2017 Reports with Unresolved Nonconformance Issues: Permit: P W 1505-005 c Nick Abdelnour(Polygon) ` Randy Allen(City of Everett) Weather Clear, 60-70's Ron Bowen(Polygon) Eddy Stevens(Polygon) Arrival/Departure: 1015/1045 I Distribution: Doug Ross(Polygon) Kirk Keck(City of Everett) 1315/1345 Paul McKee(City of Everett) Dave Foster(City of Everett) Prepared By: Ben Weinberg, EIT m Site Plan(s) ❑ Density Test Summary Signature: y�.- t�% Attachments: ❑ Installation Records m Other Reviewed By: PURPOSE of VISIT: GeoDesign representative, Ben Weinberg, was on-site part time at the request of Craig with DDS to observe foundation subgrade for Lots 243,244, and 248. SUMMARY of OBSERVATIONS: LOT 243: Previously GeoDesign noted that DDS had over-excavated the Lot 243 area approximately 6 inches to 2 feet down to firm and unyielding material. GeoDesign had notified the client and contractor that the over-excavated area was currently suitable for placement of backfill material. Today, GeoDesign noted that BDZ backfilled the Lot 243 area using a cement-treated material. GeoDesign noted that cement dust was added to a stockpile of brown SAND with gravel (near optimum moisture content)and gray-brown silty SAND with gravel (above optimum moisture content)and was thoroughly mixed using the bucket of an excavator. The cement-treated material was placed and spread using a Komatsu PC 300 excavator in approximately 18-inch loose lifts and compacted using a Hamm 3410 smooth-drum vibratory roller. GeoDesign noted that penetration depths encountered shortly after compaction were generally 3-4 inches using a 1/2 inch diameter soil probe; penetration depths encountered near the end of the day were generally 1-2 inches. The Lot 243 area was backfilled to near plan bottom of footing today. It is the opinion of GeoDesign that the exposed foundation subgrade material observed today is currently suitable for support of the intended structure. GeoDesign recommends that any loose and saturated material be removed from the base of the footings prior to placement of concrete. LOT 244: Today, GeoDesign noted that BDZ completed excavation of Lot 244 down to firm and unyielding material, which required 2-4 feet(east 1/2) and —1.5 feet(west 1/2)of over-excavation, using a Komatsu PC300 excavator. GeoDesign noted that the exposed base of the over-excavated area generally consisted of a gray-brown silty SAND with gravel which could be probed less than 2 inches using a 1/2 inch diameter soil probe. After observing the base of the over-excavated area, GeoDesign notified Leroy with BDZ that the over-excavated lot area was currently suitable for placement of backfill material GeoDesign noted that BDZ backfilled the over-excavated area with a cement-treated gray-brown silty SAND (f-m)with gravel (f-c)which was previously above its optimum moisture content. GeoDesign noted that the cement dust was added to stockpiles of material outside the foundation area and thoroughly mixed using the bucket of an excavator. GeoDesign noted that the material was mixed, placed, and spread in approximately 18 inch loose lifts using a Komatsu PC300 excavator and compacted into a firm and unyielding mass using a Hamm 3410 smooth-drum vibratory roller. Penetration depths encountered shortly after compaction were generally 2 inches using a 1/2 inch diameter soil probe. The lot area was not completely backfilled prior to our departure from the site today. 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 indicated by initials in the"Reviewed Ry'section. 10700 Meridian Avenue North,Suite 402 I Seattle,WA 98133 I 206.838.9900 2502 Jefferson Avenue I Tacoma,WA 98402 I 253.203.0095 ,� la