10312 EVERGREEN WAY SONIC Geotech Report 2023-05-25

Geotechnical Engineering Report 2 January 8,2021 Glint Car Wash and Sonic Everett,Everett,Washington RGI Project No.2020-643-1 boring logs included in Appendix A represent an interpretation of the field logs and include modifications based on laboratory observation and analysis of the samples. 3.2 LABORATORY TESTING During the field investigation, a representative portion of each recovered sample was sealed in containers and transported to our laboratory for further visual and laboratory examination. Samples retrieved from the borings were tested for moisture content and grain size analysis to aid in soil classification and provide input for the recommendations provided in this GER. The results and descriptions of the laboratory tests are enclosed in Appendix A. 4.0 Site Conditions 4.1 SURFACE The site is located at 10312 Evergreen Way in Everett, Washington and includes two parcels of land totaling about 1.91 acres in size. The site is bound to the north by Olivia Park Road, to the east by Evergreen Way, to the south a car dealership, and to the west by residential properties. The site is currently an asphalt paved and gravel parking lot with two large concrete slabs. The site is relatively flat with an elevation change of less than 5 feet across the property. 4.2 GEOLOGY Review of the Geologic Map of the Everett 7.5-Minute Quadrangle, Snohomish County, Washington, by James P. Minard (1985) indicates that the soil in the project vicinity consists of Till (Map Unit Qvt), which is a compact mixture of clay, silt, sand, and gravel, deposited at the base of the Vashon ice sheet. Some of the native soils appear to match the description for till. However, some of the native deposits appear to match the descriptions for outwash deposits, including Recessional Outwash (Qvr) that overlies the till, and Advance Outwash (Ova) that underlies the till. The site seems to be a low area that later has been graded with 5 to 7.5 feet of fill over it. 4.3 Sons The site is underlain by 5 to 7.5 feet of very loose to medium dense fill comprised of silty sand with varying amounts of gravel over native deposits of loose to medium dense silty sand with varying amounts of gravel and sand with some silt, and localized very soft to very stiff organic silt and sandy silt. Dense to very dense deposits of silty SAND with varying amounts of gravel were encountered at depths of 7.5 to 15 feet. Corporate Office 17522 Bothell Way Northeast Bothell,Washington 98011 Phone 425.415.0551• Fax 425.415.0311 www.riley-group.com