1136 GRAND AVE A&B 2016-01-01 MF Import

` ' f August 25,2006 Mr. Scott Anderson L&A Job No. 6A126 Page 2 descends at about 1-1/2H:1V for vertical drop of about 30 feet to the right-of-way of BNSF Railroad below. The site is currently occupicd in its middle by an existing house. The unpaved open area of the site is covered with lawn gass and with widely scattered,tall,mature, evergreen trees dotting the front yard and the crest of the steep slope. The trunks of these trees are sUaight, indicuting they huve not cxperienced soil movemcnt on the site. The steep slope is covered by dense brush and shrubs. Gcologic Setting and Soil Conditions Geoloeic Map of the Even�tt 7.5-Minute Ouadrangle. Snohomish County Washington by James P. :vlinard, published hy Ll. S. Grnlogical Survey in (985, was referenced for the geologic and soil conditions at the site. According to this publication, the surficial so:l units at and in the vicinity of the subject site is mapped as Vashon Till (Qn)underlain Adv.nce Outwash(Q�. 77�c gcolog}• of the Puget Sound Lowland has been modified by the advance and retreat of scvcral glacicrs in the past and subsequent deposits and erosion. The letest glacier advanced to the Puget Sound Lowland is referred to as the Vushon Stade of the Praser Glaciation, which has occuacd during the later stages of the Pleistocene Epoch and retreated from the region some 14,500 years ago. The Vashon till soil unit is depositcd dimctly by glacial ice during the most cecent glacial period as it advanced ovcr an erodcd, irregular surfuce of older formations and sediments. It is a very dense mixture of unsoried clay, si(t, sand, grnvel, and scattered cobbles and boulders, often rcferrcd to:u "hard pan". The Vashon till over the top two to four feet is normally wesithered to a LIU & ASSOCIATES, INC.