4427 29TH AVE SE 2018-05-25 - Laserfiche WebLink

4142:7 GEODES1GN —Z lELD REP•c hof .. Project Name: Everett River Front-Simpson Report: 036 GeoDesign#: Polygon-127-03 Date: 05/04/2017 Reports with Unresolved Nonconformance Issues: Permit: PW1505-005 Nick Abdelnour(Polygon) Randy Allen(City of Everett) Weather Clear,60's Ron Bowen(Polygon) Eddy Stevens(Polygon) Arrival/Departure: 0915/1615 Distribution: -_ — .- _. _..,.._ Doug Ross(Polygon) Kirk Keck(City of Everett) Paul McKee(City of Everett) Dave Foster(City of Everett) Prepared By: Ben Weinberg Attachments: 0 Site Plan(s) 0 Density Test Summary Signature: 4'—( 0 Installation Records 0 Other �Reviewed By: /eat.. PURPOSE of VISIT: GeoDesign representative, Ben Weinberg,was on-site part time at the request of Craig with DDS to observe the foundation subgrade for Lots 224, 225, and 238. SUMMARY of OBSERVATIONS: Previously, GeoDesign noted that DDS had over-excavated the foundation subgrade area approximately 2.5 feet to 4 feet below bottom of footing and that the southeast corner(-20 feet by 25 feet area)could still be probed 3 feet using a 1/2 inch diameter soil probe. Today, GeoDesign observed a test pit within southeast corner of the lot area to assess the differing subsurface conditions. GeoDesign noted that large boulders and chunks of concrete mixed with a very moist gray silty SAND with gravel was encountered from approximately 7 to 16 feet below the bottom of footing. The boulders/concrete appeared to have been encapsulated with the surrounding soil and had been subject to an approximately 10 feet surcharge during the pre-loading of Phase 2. At approximately 16 feet below bottom of footing, GeoDesign observed what appeared to be a native gray sandy SILT/gray silty SAND. GeoDesign noted that the test pit excavation was backfilled with the excavated boulders/concrete and silty SAND in a manner which reduced void space between the large boulders/concrete. The material was placed in approximately 1-2 feet lifts which were tamped into place using the bucket of an excavator. GeoDesign recommended that the loose soil in the southeast corner be stabilized by over-excavating the area an additional 3 feet and backfilling the area with at least 1.5 feet of quarry spalls tamped into the underlying soil. GeoDesign recommended that the quarry spalls be covered with a non-woven geotextile material. The remaining over-excavated area should be backfilled to bottom of footing elevation with a crushed rock material placed in lifts and compacted into a firm and unyielding mass. At the base of the over-excavated area on the west and north side of the lot area, relative compaction of the exposed soil was tested using a Troxler Moisture-Density gauge; 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. Craig with DDS stated that the over-excavated area in the southeast corner would be backfilled with quarry spalls starting tomorrow morning. 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 spedfications 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