4506 31ST AVE SE 2018-12-27 - Laserfiche WebLink

ir6)1 /1 ;\ CEO ESI N ‘\(-4.) -0 \5 — FIELD REP 1of3 Project Name: Everett River Front-Simpson Report: 060 GeoDesign #: Polygon-127-03 Date: 07/20/2017 Reports with Unresolved Nonconformance Issues: Permit: PW1505-005 Nick Abdelnour(Polygon) Randy Allen(City of Everett) Weather: Cloudy, 60's Ron Bowen(Polygon) Eddy Stevens(Polygon) Arrival/Departure: 1000/1115 Distribution: Doug Ross(Polygon) Kirk Keck(City of Everett) 1330/1615 Paul McKee(City of Everett) Dave Foster(City of Everett) Prepared By: Ben Weinberg, EIT m Site Plan(s) m Density Test Summary Signature: Attachments: ❑ Installation Records 0 Other Reviewed By: RL PURPOSE of VISIT: GeoDesign representative, Ben Weinberg, was on-site part time at the request of Brandon/Leroy with BDZ to observe foundation subgrade for Lots 251 and 252 and Craig with DDS to observe Lots 231 and 232. SUMMARY of OBSERVATIONS: LOT 252: Previously, GeoDesign noted that BDZ had over-excavated the Lot 252 area approximately 2-4 feet down to firm and unyielding and partially backfilled the excavation with a cement treated soil. Today, GeoDesign noted that BDZ had completed filling the lot area to near plan bottom of footing using the previously mentioned cement treated material. GeoDesign noted that the exposed fill material could generally be probed less than 2 inches using a 1/2 inch diameter soil probe shortly after compaction; penetration depths encountered at the end of the day were generally less than 1 inch. It is the opinion of GeoDesign that the exposed foundation subgrade for Lot 252 is currently suitable for support of the intended structure. GeoDesign recommends that any surficially loose and saturated material be removed from the base of the footing area prior to the placement of concrete. LOT 251: Today, GeoDesign noted that BDZ had completed excavation of Lot 251 down to firm and unyielding material using a Komatsu PC300. GeoDesign noted that the lot area required 2-3 feet of over-excavation across the entire lot area to expose a gray-brown silty SAND with gravel which could be probed less than 2 inches using a 1/2 inch diameter soil probe; overall grades across the lot required 3-5 feet of fill to reach the plan bottom of footing. After observing the base of the over-excavated area, GeoDesign notified the contractor that the over-excavated area was suitable for placement of backfill material. GeoDesign noted that BDZ backfilled the over-excavated area with a cement-treated gray-brow 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 12-18 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 for the first lift was less than 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 By"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