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July 21, 2014 <br />Two Single-Family residences <br />L&A Job No. 14-065 <br />Page 3 <br />The project site is currently occupied in its west half by an existing house, with a <br />swimming pool in its northeastern quadrant. Above the site is a steep northwesterly- <br />t�rending hillside with its toe extending into tlae southeast quadrant of the project site. The <br />rest o� the project site slopes down very gently northwesterly towards the northwest <br />corner of the site. The toe of the steep hillside in the southeast quadraiat of the site is <br />dotted by young deciduous trees and shrubs and is covered by thick underbrush. The <br />open space of the site is mostly covered by lawn grass. <br />GEOLOGI�C SETTING <br />`�'�e Pr�li�±�r�a�-y Starf c��l_ C'T��I��;Y Tvl�n_ of_ �he Ivl�akilteo_ and Everett Quadran�les, <br />Snohornis� �;�un�y, �'V�shin io�i, �y V�ack�y �i��itl�, ��i�lis�le�l ii� 1976 by �J. �. <br />Geological Survey, was referenced for the geologic and soil conditions of the site. <br />According to this publication, the surficial soil unit sat and in the vicinity of the site are <br />mapped as Vashon Till (Q� underlaui by Whidbey formation (QW}. <br />The geology of the Puget Sound Lowland has been modified by the advance and retreat of <br />several glaciers in the past and subsequent deposits and erosion. The latest glacier <br />advanced to the Puget Sound Lowland is referred to as the Vashon Stade of the Fraser <br />Glaciation, �vhich has occurred during the later stages of the Pleistocene Epoeh and <br />retreated froAn the region some 12,540 years ago. <br />The deposits of the Vashon till soil unit were plowed directly under glacial ice during the <br />most recent gla�cial period as the glacier �dvanced over an eroded, irregular surface of <br />older formations and sediments. This soil unit is composed of a mixture of unsorted clay, <br />LIIT & ASSOCIATES, INC. <br />