6801 SEAWAY BLVD Geotech Report 2025-08-19

Seaway Commercial Center Subsurface Exploration,Geologic Hazard, 7007 Seaway Boulevard and Geotechnical Engineering Evaluation Everett, Washington Project and Site Conditions explorations is necessary. It should be noted that subsurface conditions differing from those depicted on the logs may be present at the site due to the random nature of deposition and the alteration of topography by past grading and/or filling. The nature and extent of variations between the field explorations may not become fully evident until construction. If variations are observed at that time, it may be necessary to re-evaluate specific recommendations in this report and make appropriate changes. 3.1 Exploration Pits The exploration pits were excavated on October 23, 2020 by Northwest Excavating &Trucking, under subcontract to AESI, using a track-mounted excavator. The pits permitted direct visual observation of subsurface conditions. Materials encountered in the exploration pits were studied and classified in the field by a geologist from our firm. All exploration pits were backfilled after examination and logging. Selected samples were then placed in water-tight containers and transported to our laboratory for further visual classification. The exploration logs included in Appendix A are based on the field observations and inspection of the samples secured. 3.2 Exploration Boring The exploration boring was completed on November 6, 2020 by Holocene Drilling Inc., under subcontract to AESI, using a track-mounted, hollow-stem auger drill rig. The exploration boring was continuously observed and logged by a geologist from our firm. Samples were obtained at depth intervals of approximately 2.5 to 5 feet using the Standard Penetration Test (SPT) procedure in accordance with ASTM International (ASTM) D-1586. The SPT sampling method consists of driving a standard, 2-inch outside-diameter, split-barrel sampler a distance of 18 inches into the soil with a 140-pound hammer free-falling a distance of 30 inches. The number of blows for each 6-inch interval is recorded, and the number of blows required to drive the sampler the final 12 inches is known as the Standard Penetration Resistance ("N") or blow count. If a total of 50 is recorded within one 6-inch interval, the blow count is recorded as the number of blows for the corresponding number of inches of penetration. The resistance, or N-value, provides a measure of the relative density of granular soils or the relative consistency of cohesive soils; these values are plotted on the exploration log in Appendix B. Samples collected from the exploration boring were classified in the field and representative portions placed in water-tight containers. The samples were then transported to our laboratory for further visual classification. 4.0 SUBSURFACE CONDITIONS Subsurface conditions at the project site were inferred from the field explorations accomplished for this study, visual reconnaissance of the site, and review of applicable geologic December 17,2021 ASSOCIATED EARTH SCIENCES,INC. PEL/Id-20200319E001-002 Page 3