3000 41ST ST 2025-06-25 - Laserfiche WebLink

DESIGNu- Project Name: Everett River Front- Simpson GeoDesign # : Polygon-127-02 Reports with Unresolved Nonconformance Issues: Low sewer trench compaction: DFR 97, 101-108, 111, 112, 113, 125 Low storm drain trench compaction: DFR 115, 116, 117, 118, 119, 120, 121, 122, 123 Ron Bowen (Polygon) Stephen Farnan (Polygon) Distribution: Kyler Meek (Polygon) Randy Allen (City of Everett) Attachments: 0 Site Plan(s) 0 Density Test Summary ❑ Installation Records ❑ Other FIELD REPORT 1 of 3 Report: 125 - Revised Date: 1 /2/2019 Permit: PW1505-005 Weather: Overcast, 40's Arrival/Departure: 1200/1400 Prepared By: Aubrey Hodgins Signature: ail-U0,A� Reviewed Bv: PURPOSE of VISIT: GeoDesign representative, Aubrey Hodgins, was on -site part time at the request of Stephen Farnan with Polygon Homes to observe installation of side sewers for Phase 2. INSTALLATION OF ROAD 'B' SIDE SEWERS: Today, GeoDesign noted that WSB had finished installation of sanitary side sewers (8-inch diameter Schedule 80 PVC) along Road B (from STA 30+31 to approximately 30+52) using two excavators. GeoDesign noted that the trench areas were approximately 6 feet wide and ranged in depth from approximately 4 to 6 feet BGS. Bedding and pipe zone material for the side sewers consisted of a 1-1/4 inch minus crushed rock compacted using a walk -behind plate compactor. The material excavated from the trench area consisted of a gray silty SAND (f-m) with gravel (f-c) which was at moisture contents ranging from 12.7% to 13.2% (5.3% to 5.8% wet of its optimum moisture content). GeoDesign notified the contractor where material was wet of its optimum moisture content and would not currently be able to achieve 95% of its maximum dry density. We recommended cement -treatment of the on -site soil, which was used on Phase 2 of the project, to use as backfill material. GeoDesign noted that the backfill material was placed with an initial 1-2 feet lift, with subsequent loose lifts of approximately 1.5 to 2.0 feet. The backfill material was placed using a loader and compacted using an excavator mounted hoe -pack. Relative compaction of the backfill material was tested using a Troxler Moisture -Density gauge; in -place density tests indicated that the material within the top 3 feet had generally been compacted to less than 95% of its maximum dry density, as determined by a Modified Proctor analysis, due to its high moisture content. We noted that a majority of the backfill material near the surface today exhibited signs of pumping during compaction. Based on our observations and testing, it is our opinion that the trench backfill observed today, as indicated on the attached site plan, has not been prepared in general accordance with the project plans and our geotechnical recommendations. The contractor was notified of our observations during our site visit today. It is our understanding that both the client and contractor understand that a portion of the on -site soil is currently unsuitable for use as structural backfill (too wet to achieve 95% of its maximum dry density) and that areas not meeting compaction requirements will need to be repaired prior to placement of base rock material. GeoDesign was informed that storm drain installation has been postponed for further instruction from the owner and that WSB will begin installation of sewer main on Road B tomorrow. A summary of our observations can be found in the attached Figure 1 and Nuclear Density Gauge Data. The contractor was notified of our observations 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 1 Seattle, WA 98133 1 206.838.9900 2502 Jefferson Avenue I Tacoma, WA 98402 1 253.203.0095