4424 31ST AVE SE 2019-04-18 - Laserfiche WebLink

.. GE DESIGN Z FIELD REPORT 1 of Project Name: Everett River Front-Simpson Report: 058 GeoDesign# Polygon-127-03 Date: 07/18/2017 Reports with Unresolved Nonconformance Issues: Permit: PW 1505-005 I ~p~� Weather Clear,, 60-70's Nick (Polygon) Rand Allen(Cit of Everest) Ron Bowen(Polygon) Eddy Stevens(Polygon) Arrival/Departure: 1130/1615 t Distribution: I 1Doug Ross(Polygon) 1 Kirk Keck(City of Everett) Paul McKee(City of Everett) 1 Dave Foster(City of Everett) Prepared By. Ben Weinberg ;. m Site Plan(s) ❑ D_ensity Test Summary Signature: ,,07 ..- Attachments: _ Other __ _.___ i ❑ Installation Records Reviewed By: PURPOSE of VISIT: GeoDesign representative, Ben Weinberg,was on-site part time at the request of Brandon/Leroy with BDZ to observe the foundation subgrade for Lots 254 and 253. SUMMARY of OBSERVATIONS: LOT 254: Previously, GeoDesign noted that the east side of Lot 254 required approximately 3.0 feet of over-excavation to expose firm and unyielding material which could be probed less than 2 inches using a 1/2 inch diameter soil probe. Today, GeoDesign noted that BDZ had backfilled the over-excavated area and filled below-plan-grade portions of the west side 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 6-18 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 less than 2 inches using a 1/2 inch diameter soil probe. It is the opinion of GeoDesign that the foundation subgrade area observed today 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 foundation area prior to the placement of concrete. LOT 253: Today, GeoDesign noted that BDZ had completed excavation of the footing and crawl space area for Lot 253 using a Komatsu PC300 excavator. GeoDesign noted that the exposed foundation subgrade consisted of a gray to gray-brown silty SAND with gravel and concrete/asphalt. Penetration depths encountered across the west side of the lot area were generally less than 1 inch. GeoDesign noted that that the east 1/4 of the lot area required approximately 3.5 feet of over-excavation to expose firm and unyielding ground which could be probed less than 2 inches using a 1/2 inch diameter soil probe. GeoDesign notified the contractor that the over-excavated area was suitable for placement of backfill material. GeoDesign noted that BDZ partially 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 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. A summary of our observations and density tests taken today can be found in the attached Figure 1. 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 V/