607 RIVERSIDE RD Geotech Report 2022-10-25 (2)

I I Geotechnical Report Riverside Business Park — Lots 5 and 6 Riverside Road Everett, Washington 1.0 PROJECT DESCRIPTION The project consists of developing Lots 5 and 6 comprising approximately 13.62 acres of land at the Riverside Business Park in Everett, Washington. The development will include construction of a 209,500 square-foot industrial building with associated infrastructure improvements. We expect the building will be constructed using precast concrete tilt up wall panels with interior isolated columns supporting the roof framing. The floor slab will be constructed at grade,with dock-high loading doors located on the east side of the building. We anticipate structural loading will be light with columns carrying 100 to 150 kips and continuous bearing walls carrying 4 to 6 kips per foot. Product loading on the floor slab is not expected to exceed 350 pounds per square foot. The recommendations contained in the following sections of this report are based on the above design features. We should review any changes in the geotechnical aspects of the design plans as they are developed to verify that our recommendations are valid for the proposed construction and to amend or modify our report,as necessary. 2.0 SCOPE OF WORK Our scope of work was completed in accordance with our authorized proposal dated January 13, 2016. On March 7, 2016,we excavated 12 test pits to depths of 8 feet to 111/2 feet below existing site grades. In addition, on March 8, 2016, six Cone Penetration Tests (CPTs)were advanced at the site to a depth of 60 feet. Using the information obtained from our subsurface exploration, we performed analyses to develop geotechnical engineering recommendations for project design and construction. Specifically,this report addresses the following: • Soil and groundwater conditions • Seismic • Site preparation and grading including recommendations for building preload or surcharge to mitigate floor and foundation settlement. • Foundations • Floor slabs • Lateral earth pressures for wall design • Subsurface drainage • Utilities • Pavements I I