1601 FLORIDA DR Geotech Report 2022-10-25

September 10,2017 Infiltration Tests L&A Job No. 17-095 Page 2 SITE CONDITIONS Surface Condition The general location of the project site is shown on Plate 1 — Vicinity Map. The project site is situated in a broad, gentle, easterly-declining plain. It is bounded by Florida Drive to the south, and adjoined by residential development to the north, east, and west. Within the site, the ground generally slopes down gently to very-gently eastward. The site is currently occupied in its south half by a house with a detached parking garage. The area surrounding the site is covered by lawn grass, with scattered ornamental trees dotting the south half and tall evergreen trees dotting the north half of the site. Geologic Setting The Geologic Map of the Everett 7.5-Minute Quadrangle, Snohomish County, Washington, James P. Minard, published by U. S. Geological Survey in 1985, was referenced for geologic and soil conditions of the project site. According to this publication, the surficial soil unit at and in the vicinity of the project site is mapped as Vashon till (Q t) deposits. The geology of the Puget Sound Lowland has been modified by the advance and retreat of several glaciation periods in the past one million years or so and the subsequent deposits and erosions. The latest glacier advanced to the Puget Sound Lowland is referred to as the Vashon Stade of the Fraser Glaciation which had occurred during the later stages of the Pleistocene Epoch, and retreated from the region some 12,500 years ago. LIU & ASSOCIATES, INC.