6801 SEAWAY BLVD Geotech Report 2025-08-19

Seaway Commercial Center Subsurface Exploration,Geologic Hazard, 7007 Seaway Boulevard and Geotechnical Engineering Evaluation Everett, Washington Design Recommendations 10 feet of excavation into the underlying dense glacial till. The approximate boundary separating the two zones of allowable bearing pressure within the building footprint is indicated by a dashed line on Figure 3. It should be noted that the soil conditions may vary between exploration locations and foundation bearing soils suitable for 3,000 psf loading may be encountered within the higher bearing pressure zone (6,000 psf) indicated on Figure 3. Provisions should be included in the plans and contract documents to allow for modifications of the allowable bearing pressure and corresponding footing schedule based on the soil conditions encountered at the time of construction. The allowable bearing pressures recommended above may include both dead and live loads. An increase in the allowable bearing pressure of one-third may be used for short-term wind or seismic loading. If structural fill is placed below footing areas, the structural fill should extend horizontally beyond the footing edges a distance equal to or greater than the thickness of the fill. 11.2 Footing Depths Perimeter footings for the proposed distribution center should be buried a minimum of 18 inches into the surrounding soil for frost protection. No minimum burial depth is required for interior footings; however, all footings must penetrate to the prescribed stratum, and no footings should be founded in or above loose, organic,or existing fill soils. 11.3 Footings Adjacent to Cuts The area bounded by lines extending downward at 1H:1V from any footing must not intersect another footing or intersect a filled area that has not been compacted to at least 95 percent of ASTM D-1557. In addition, a 1.5H:1V line extending down from any footing must not daylight because sloughing or raveling may eventually undermine the footing. Thus, footings should not be placed near the edges of steps or cuts in the bearing soils. 11.4 Footing Settlement Anticipated settlement of footings founded as described above should be less than 1 inch. However, disturbed soil not removed from footing excavations prior to footing placement could result in increased settlements. 11.5 Footing Subgrade Bearing Verification All footing areas should be observed by AESI prior to placing concrete to verify that the exposed soils can support the design foundation bearing pressure and that construction conforms with December 17,2021 ASSOCIATED EARTH SCIENCES,INC. PEL/Id-20200319E001-002 Page 14