3431 NASSAU ST 2018-01-02 MF Import

04/14/04 07:14 FAX 4253476588 CDnA GVGRM Q 008/032 Geologic, lnyesligannn anrl Genmchnical A'yglnecrin L?e1x)rt 00-02-20 NC Comer 35°' St. and Nassau St. Gvcreu, Washington Lowland contains the majority of the Puget Sound basin area, including the project site. During the recent geologic past, within the last one-(/) million years or so, the topography of the Lowland was altered by a series of glacial events originating out of the Canadian Coastal Range (cordilleran ice flows) and the northern Cascade Mountains (alpine ice.hows). 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-(2) recognized glacial advances (slade.c) separated by a time period of glacial retreat (intenavade). The younger stade of the Fraser Glaciation is locally known as the Sumas, while the older is called the Vashon Deposits from the Vashon stade are located on and around the project site. Glacial advances and retreats have effected surficial topography and soils throughout the area. These advances and retreats have created a high plateau region along the Puget Sound with characteristic undulating surficial features inland along the Cascade foothills. The high plateau has been incised by drainage's over the last 10,000 years. Surficial and near surficial soil types are associated with the glaciation of the area and can be up to several hundreds of feet thick. Geologic deposits in the project area have been mapped on the Preliminary Si fic_rul Geolo/,ic AIap oJA411A teo an(/ Gverelr Quadrangle Snohomish County, Kea., USES, by M. Smith dated 1976. For reference purposes, a copy of the portion of this Geologic Map containing the project area is contained in Appendix C of this report. 3.3 Site Stratigrapliv Site stratigraphy has been interpreted from the soil information collected from the test pits and hand augered holes excavated during the site investigation. This information was correlated with the mapped geology of the area The approximate location of the test pits and hand augered holes excavated on the lot is shown on the Site Map contained in Appendix B of this report. The test pits and hand augered holes were located as accessible by equipment so as to provide optimum information concerning the shallow subsurface soil conditions at the time of the site investigation work. All soil was logged and classified as it was removed from the ground by an engineering geologist from GES, Inc. Copies of the Test Pit Logs hand auger Probe Logs are contained in A1)1)endix 1. of tl+is report. The soil descriptions on the logs were 4 GES, Inc.