4626 HARBOR LN 2018-01-02 MF Import

Gcotechnical Engineering Evaluation Fox Residence Underpinning and retaining Wall Design Everett, Washington SITE CONDITIONS Surface Conditions NGA File No.853512 August 3, 2012 Page 2 The property is an irregular -shaped parcel and is gently to moderately sloping down to the north and northwest. The property is bounded to the west, south, and cast by residential properties, and to the north by Mukiitco Boulevard. The residence is located within the southern portion of the property. A grass lawn is located to the on the southern, eastern, and northern sides of the residence. The northern lawn covers the length of the property to the property line. The area to the west of the residence is covered with some lawn, but also a slope with exposed dirt. Past this area and continuing to -` c vest and northwest, the property is covered with young to mature trees and underbrush, and a steep slope is located to the west of the property. We did not observe surface water within the site during our site visit. The property generally slopes moderately down to the north and northwest. Undocumented fill slopes around the residence have inclinations of approximately 20 to 36 degrees (36 to 73 percent), but the areas below the fill areas slope at approxin.ately 6 to 10 degrees 01 to 18 percent). Profiles of the site slopes are shown on Cr ss Sections A A', B-B', and C-C', in Figures 3, 4, and 5, respectively. Subsurface Conditions Geology: The geologic units for this area are shown on the Distribution and Description of Geologic Units in the Mukilteo Quadrangle Washington, by James P. Minard (USGS, 1982), The site is mapped as Qtb (Transitional Beds). The Transitional Beds deposit is described as mostly thick beds of gray, clay, silty and fine to very fine sand. Our explorations generally encountered fine to medium sand below the fill generally consistent with .ne description of the Transitional Beds. Explorations: The subsurface conditions within the site were explored on Friday, July 13, 2012 by excavating three hand augers to depths ranging from 3.3 to 6.5 feet below the existing ground surface and garage slab. The approximate locations of our explorations are shown on the Site Plan in Figure 2. A geologist from NGA was present during the explorations, examined the soils and geologic conditions encountered, obtained samples of the different soi! types, and maintained logs of the hand augers. The soils were visually classified in general accordance with the Unified Soil Classification System, presented in Figure 6. The logs of our hand augers are attached to thi: report and are presented as Figure NELSON GEOTECHNICAL ASSOCIATES, INC.