8525 EVERGREEN WAY BURGER KING 2021-05-10

Geotechnical Engineering Evaluation NGA File No. 998317 Burger King Restaurant Development August 2,2017 Everett,Washington Page 2 SITE CONDITIONS Surface Conditions The site consists of an irregularly-shaped parcel covering approximately 0.98 acres. The site is situated on relatively level ground. The property is currently occupied by an abandoned, single-story commercial restaurant structure within the northwest corner of the property. The remaining portion of the property is covered asphalt paving and sparse vegetation within portions of the property. The property is bordered to the northwest by Evergreen Way, and to the southwest by Holly Drive, and to the east and south by existing commercial properties. We did not observe any ponding groundwater within the site during our site visit on July 6, 2017. Subsurface Conditions Geology: The Geologic Map of the Everett 7.5-minute Quadrangle, Snohomish County, Washington, by James P. Minard (USGS, 1985) was reviewed for this site. The site is mapped as Qvt (Vashon till). The Vashon till is described as a non-sorted mixture of clay, silt, sand, pebbles, cobbles, and boulders in variable amounts. Our explorations generally encountered a relatively thin, surficial layer of undocumented fill underlain by dense silty sand soils consistent with the description of Vashon Till at depth. Explorations: We visited the site on July 6, 2017 to explore the subsurface soil and groundwater conditions by drilling three exploratory borings using a truck-mounted drill rig. The approximate locations of our explorations are indicated on the Site Plan in Figure 2. A geologist from Nelson Geotechnical Associates, Inc. (NGA) was present during the explorations, examined the soils and geologic conditions encountered, obtained samples of the different soil types, and maintained logs of the explorations. A Standard Penetration Test (SPT) was performed on each of the samples during drilling to document soil density at depth. The SPT consists of driving a 2-inch outer- diameter, split-spoon sampler 18 inches using a 140-pound hammer falling 30 inches. The number of blows required to drive the sampler the final 12 inches is referred to as the "N"value and is presented on the boring logs. The N value is used to evaluate the strength and density of the deposit. The soils were visually classified in general accordance with the Unified Soil Classification System, presented in Figure 3. The logs of our borings are presented as Figures 4 through 6. The following paragraph contains a general description of the subsurface conditions encountered in the explorations. For a detailed description of the subsurface conditions,the boring and test pit logs should be reviewed. NELSON GEOTECHNICAL ASSOCIATES, INC.