7100 HARDESON RD Geotech Report 2025-03-06

I Geotechnical Engineering Report 1 rerracon Merrill Creek Operations Base Expansion • Everett, Washington ' December 14, 2020 • Terracon Project No. 81205012 GeoReport Ithe weight of soil and floor slab, plus the dead weight of the foundation, divided by an appropriate factor of safety. A maximum total unit weight of 120 pcf may be used for the backfill. Greater uplift Iresistance may be achieved through deeper burial of footings, although we do not recommend a burial depth exceeding 4 feet below the existing surface grade. If greater uplift resistance is necessary (such as for seismic reactions) we recommend that micropiles or similar I drilled/augered tension elements be installed for supplemental uplift capacity. , limits of Soil for Uplift Resistance i *IILt I tT ;4%1: I I 4:1/4 ,; si[tfiA ir. . / ill '.'::s I0 woe IFoundation Construction Considerations I As noted in Earthwork, the footing excavations should be evaluated under the direction of the Geotechnical Engineer. The base of all foundation excavations should be free of water and loose soil prior to placing concrete. Concrete should be placed soon after excavating to reduce bearing Isoil disturbance. Care should be taken to prevent wetting or drying of the bearing materials during construction. Excessively wet or dry material or any loose/disturbed material in the bottom of the Ifooting excavations should be removed/reconditioned before foundation concrete is placed. If unsuitable bearing soils are encountered at the base of the planned footing excavation, the excavation should be extended deeper to suitable soils and the excavated footprint expanded as Ishown below. The over-excavation should be backfilled up to the footing base elevation, with structural fill placed and compacted as recommended in the Earthwork section. I I I I Responsive • Resourceful • Reliable 12