1921 W MUKILTEO BLVD 2018-01-02 MF Import

Preliminary Geotechnical Engineering Evaluation 1919 Mukilteo Boulevard October 20, 2005 NGA File Nc. 718805 Page 2 8. Provide recommendations for pavement support. 9. Provide recommendations for site drainage and erosion control. 10. Document the results of our explorations, findings, conclusions, and recommendations in a written geotechnical engineering report. SITE CONDITIONS Surface Conditions The site is an irregularly shaped parcel consisting of two lots covering just under one -acre. The property is bordered to the north by Burlington Northern & Santa Fe Railroad, to the south by Mukilteo Boulevard, and to the east and west by residential properties. The property is situated on a gentle to steep north - facing slope overlooking Possession Sound. A single-family residence with a basement, a shed, and a driveway asses, from Mukilteo Boulevard currently occupy the central portion of the property. Apple trees, cedar trees, hydrangea bushes, roses, blackberry bushes and a lawn area surround the existing house. The steep slope on the northern side of the property is approximately 100 feet in height and has an overall inclination of about 40 degrees (84 percent) down to the north, as shown on Cross-section A -A' in Figure 3. The slope is vegetated with scattered alders, blackberry bushes and underbrush. We did not observe surface water on site or seepage on the slope during our visits on August 18 and 30, 2005. Sloughing soil was noted from a near vertical portion of the top of the slope near the east property line. The area of sloughed soil was about 10 feet wide and exposed silty sand material. Subsurface Conditions Geology: The geologic units for this area are shown on the Distribution and Description of Geologic Units, Mukilteo Quadrangle, Washington, by James P. Minard (U.S.G.S., 1982). The site is mapped as Transitional Beds (Qtb). This unit is described as thick beds of clay, silt, and fine sand. Our explorations generally encountered sand and silty sand deposits consistent with the description of Transitional Beds. Explorations: The subsurface conditions within the site were explored on August 30, 2005, by drilling three borings to depths ranging from 29.0 to 4S.0 feet below the existing surface using a truck mounted NELSON GEOTECHNICAL ASSOCIATES, INC.