Laserfiche WebLink
lunc i '_011 <br /> �ir. Chris )ohn�on <br /> L��;A ioh �o. I I-UJ6 <br /> P:i�e � <br /> alune Seahunt .lccnue. \l�ithin thc prup�rtc. th� ground _enrralh �lope, g�ntl� to <br /> moderatzl�' do��'n easterl}'��'ith :+ eentle crois ,lo�,� do«n io ihe north. l�he purposc o1 thr <br /> on-coim� �zradims i� to lccel thc back card�cith �ill. <br /> Gcologic and Soil Conditions <br /> ll�e Preliminan Geuloeic 1fa of the L=�eren i.�-�tinate �liiadranele. Snohomi;h <br /> Counn. ��a;hineton, b� Jame, P. �4inard. published b�• U. S. Geoloeical Stm�e� in ]98�. <br /> �cas refernced for the scoloeic and soil conditions �t the sul�ject site. According to this <br /> publication. thc suriieial ,uil units at and in the cicinit� ot thc rl�t site are mapPed as a <br /> \'ashon Till (Q��I und�rlain hc Ad�ance Oui��a;h tQ�al. <br /> l�he ��eolo��� ut ihe Pu��et Sound Lo«iand h�s been moditied b� the ad�'ance and retreat ot <br /> ;e�eral glaciers in thr past aitd subsrquent deposit; and zrosion. The latest _laci�r <br /> ad�anced to the Puget Suund Lo�cland i� referred to as the Vashun Stade of the Fras�r <br /> Glaciation. ��'hich has occurred durin� the later sta�es of ihz Pleistocene Lpoch �nd <br /> retreated from the reeion some 1�.�00�cars agu. <br /> The \'ashon till soil unit ��as plu��ed directl� under glacial ice during the most recent <br /> elacial pe:iod as the �_�acier ad�'anced o�'er an erud�d. irrceular surface oT older <br /> t:irmations and sediments. This soil unit is composed of a mixmre of wisorted cla�'. silt. <br /> ;and. _�r:i�el. and scattered cobbles and boulder;. The till �oil o�er the top t��o to four <br /> feet is nonnall� ���eather�d to a med�um-dense state. and is moderatel� penneable and <br /> comprzssible. The undcrl�'ing fresh till soil i� �'en' den,e• �nd is conunonh' referred to as <br /> „h�rd pan". The 1i•esh till soil is practicalh impenious to stonmra[er inliltratiun. 1'he <br /> LiU & ASSOCIATES, INC. <br /> �, <br /> ' -� , <br /> � �v ;. <br /> . � <br />