4721 BELVEDERE AVE 2018-01-02 MF Import

Geotechnical Engineering Report 4721 Belvedere Ave, Everett - I lout January 18, 2009 RMI File No. 50609 Page 2 3. Provide a geotechnical report discussing our findings, opinions, and recommendations for the planned construction as applicable to this project. EXISTING CONDITIONS General We reviewed the general geologic conditions of the site, which are shown on the Distribution and Description of Geologic Units in the Mukilteo Quadrangle, Washington by Minard, James P (USGS, 1982). The site area, slope profile, observed conditions, existing features, and proposed decks locations are shown on the enclosed Site Plan (Figure 2) and Schematic Cross -Section A -A' (Figure 3). Surface Conditions There is an existing house with a small ground -level deck at the entrance to the house and a large elevated deck at the rear of the house. Both decks will be rebuilt in essentially the same footprints: the entrance deck will be slightly smaller (by about 30 sq.R) while the rear deck will be slightly larger (by about 26 sq.R.). There is a slope between the entrance deck and the street: the soil rises at about 35 degrees for about 10 feet and then Battens. It is retained at its base by a small retaining wall. The revised deck will be kept away from the toe of the slope. As the slope is less than the angle of repose of the sand forming it there should be no stability problem. The slope beyond the back deck is at about 12 degrees for 20 to 30 feet then drops down at about 26 degrees for about 100 feet to a stream at its base. The upper slope is covered with grass and a few fruit trees while the steeper slope has blackberries and a few conifer trees. The shallower slope has some fill on it but both slope angles arc less than the angle of repose of the soil so there should be no stability problem. Note that the house was built more than 30 years ago. Geologic Conditions Landforms within this region comprise a system of glacially sculptured features, which have been exposed by post -glacial erosion. Locally, the terrain of this area has been glacially modified, and the soils placed either prior to, or during the latest glaciation of the Puget Lowland area. Glacial ice last occupied the region during the late Pleistocene epoch, some 10,000 to 13,000 years before the present. RMI ASSOCIATES LLC U31�