3611 FEDERAL AVE 2018-01-02 MF Import

Geologic Investigation and Geotechnical Enitineerin¢ Report Jones Residence 3611 Federal are. Everett, Washington 98-08-10 Site grades in the proposed construction area range from moderately sloping to moderately flat or slightly sloping in an easterly direction. Elevations, based on the supplied Sit Plan, range front a high of el. 382 at the southwestern property corner to a low of el. 347 at the northeastern property corner. Silty dirt is exposed in most areas on the property. A siltation fence has been placed along the lower eastern property line. A Site Map showing the existing topography and the location of our test pits is included in Appendix B of this report. 3.2 Geoloeic Setting The site lies in a geologic region known as the Puget Sound Lowland Physiographic Province. The Puget Sound Lowland Physiographic Province consists of a linear depression that trends in a north -south direction between the Olympic Mountains to the west and the Cascade Mountains to the east. The Lo%%land contains the majority of the Puget Sound Basin area. During the recent geologic past, within the last I million years or so, the topography of the Lowland was altered by a series of glacial events originating out of the Canadian Rockies (cordilleran ice flows) and the northern Cascade Mountains (alpine ice flows) Deposits of at least four -(a) Pleistocene aged glaciations have been identified in the Puget Sound Lowland Physiographic Province. The last of these glaciations has been named the Fraser. The Fraser Glaciation includes two-(1) recognized advances (slades) separated by an interstade — or retreat period. The younger stade of the Fraser Glaciation is locally known as the Sumas, while the older is called the Vashon Stade Deposits from the Vashon Stade and a later interstade (post-Vashon) are found within the project area. Surficial geologic deposits in the project area have been mapped by the USGS and published in the Geologic Map of the Everett 7.5 Minute Quadrangle, .Snohomish County, Wa. by J.P. Minard dated 1985. For reference purposes, a copy of a portion of this map containing the project site has been included as a Geologic Map in Appendix C of this report. 4 GES, Inc.