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Geotechnical Engineering Report Page 2 January 8,2021 <br /> Glint Car Wash and Sonic Everett,Everett,Washington RGl Project No.2020-643-1 <br /> Executive Summary <br /> This Executive Summary should be used in conjunction with the entire GER for design <br /> and/or construction purposes. It should be recognized that specific details were not <br /> included or fully developed in this section, and this GER must be read in its entirety for a <br /> comprehensive understanding of the items contained herein. Section 7.0 should be read <br /> for an understanding of limitations. <br /> RGI's geotechnical scope of work included the advancement of eight borings to depths up <br /> to 16 feet below ground surface (bgs). <br /> Based on the information obtained from our subsurface exploration, the site is suitable <br /> for development of the proposed project. The following geotechnical considerations were <br /> identified. <br /> Soil Conditions: The site is underlain by 5 to 7.5 feet of very loose to medium dense fill <br /> comprised of silty sand with varying amounts of gravel over native deposits of loose to <br /> medium dense silty sand with varying amounts of gravel and sand with some silt, and <br /> localized very soft to very stiff organic silt and sandy silt. Dense to very dense deposits of <br /> silty SAND with varying amounts of gravel were encountered at depths of 7.5 to 15 feet. <br /> Groundwater: Groundwater seepage was encountered at each boring location at depths <br /> of 2.5 to 10 feet during our subsurface exploration. <br /> Foundations: Foundations for the proposed building foundation can be supported on <br /> spread footings bearing on 18 inches of structural fill. <br /> Slab-on-grade: Slab-on-grade floors for the proposed building can be supported on 12 <br /> inches of structural fill. <br /> Pavements:The following new pavement sections are recommended: <br /> ➢ For heavy truck traffic areas: 4 inches of Hot Mix Asphalt over 8 inches of crushed <br /> rock base (CRB) over 18 inches of structural fill over a woven fabric <br /> > For general parking areas: 3 inches of Hot Mix Asphalt over 6 inches of CRB over <br /> 12 inches of structural fill over a woven fabric <br /> ➢ For drive-thru areas: 5 inches of concrete over 4 inches of CRB over 18 inches of <br /> structural fill over a woven fabric <br /> Corporate Office <br /> 17522 Bothell Way Northeast <br /> Bothell,Washington 98011 <br /> Phone 425.415.0551• Fax 425.415.0311 <br /> wu�•.ri ley-group.co <br />