330 ELM ST VIEW RIDGE ESTATES 2022-04-04

• 'Geotechnical Engineering Evaluation NGA File No. 1085419 View Ridge Estates 330 Building Settlement March 22,2019 Everett,Washington Page 3 The soils were visually classified in general accordance with the Unified Soil Classification System, presented in Figures 3. The logs of our explorations are attached to this report and are presented as Figures 4 through 8. We present a brief summary of the subsurface conditions in the following paragraphs. For a detailed description of the subsurface conditions, the exploration logs should be reviewed. At the surface of Borings 1, 2, and 3 located along the eastern perimeter of the building we typically encountered approximately 5.5 to 11.5 feet of very loose to loose, dark brown to reddish brown, organic- laden silty sand with varying amounts of gravel and trace wood debris, which we interpreted as undocumented fill soils. Underlying the fill soils we generally encountered medium dense to dense, light brown to gray, fine to medium sand with silt and varying amounts of gravel and iron-oxide staining, which we interpreted as native advanced outwash deposits. Borings 1, 2, and 3 terminated at respective depths of 36.5, 36.5, and 31.5 feet below the existing ground surface. At the surface of Boring 4 located along the northwestern exterior of the building we generally encountered approximately 9.0 feet of loose, light brown to dark brown, silty fine to medium sand with scattered organics, roots, and gravel, which we interpreted as undocumented fill soils. A crawlspace exists along the western half of the building and the undocumented fill soils appeared to extend to the approximate depth of the base of footing elevation in this area. Underlying the undocumented fill soils we generally encountered light brown to gray-brown, fine to medium sand with silt and varying amounts of gravel, which we interpreted as native outwash deposits, Boring 4 terminated at 31.5 feet below the existing ground surface. At the surface of Hand Augers 1 and 2 located directly along the exterior eastern footings within the northeast-central and southeast-central portions of the building we generally encountered 6.8 to 7.5 feet of dark brown to gray, silty sand with varying amounts of organics, roots, wood debris, and gravel, which we interpreted as undocumented fill soils. Hand Auger 1 terminated within the undocumented fill soils at 7.5 feet below the existing ground surface. Hand Auger 2 encountered medium dense or better gray, fine to medium sand with silt and gravel at approximately 6.8 feet below the existing ground surface, which we interpreted as native outwash soils. Hand Auger 2 terminated at 8.2 feet below the existing ground surface. At the surface of Hand Augers 3 and 4, located within the west-central and northwestern portions of the crawlspace area along the footings we generally encountered 0.3 to 0.5 feet of reddish brown to light brown, silty sand with gravel and iron-oxide weathering, which we interpreted as disturbed native soils. Underlying the disturbed native we encountered medium dense or better light brown to gray-brown, fine NELSON GEOTECHNICAL ASSOCIATES, INC.