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Jun� 3. '-�l 1 <br /> \-tr. Chris .lohnson <br /> Lfi�A Jub \o. 11-b-�6 <br /> 1'aec � <br /> Gesh till ,oil rosses;es the ;trength of lo��-grade concrete and can stand in �t�ep natural <br /> ,lopes or man-make cuts for a lon� period. (f remained undisturbed and ��ell-drained. the <br /> tiesh till �oil r�n pro';ide e�cellent found�tion ,uppoi� to structures ��ith little ;ettlentent <br /> zxpccted. <br /> I�he ad�ance out��a,h soil unit nomialh und�rl�ing tlie �'ashon till �oil unit is compu�ed <br /> uf ;tratit3ed sand and _raczl ���ith minor amoimt of ;ih and cla�. deposited b� the <br /> mclt��ater of ad�ancin�_ glacial ice ol ihe last glacier. Due to their generall}' �=ranular <br /> cumpositiun. the ad��anee out��ash deposits are ot moderaieh hieh penneabilit�� and drain <br /> fairl� ��eli. llie ad�:mce out.��ash depo;its had been elaciall� o�erridden and are <br /> acnzralh• dense to ��en� dcnse in tlteir natural. undisturbed state. c�czpt the soil in the top <br /> � to a fect ��hich is normall� ��eathered to a loose to medium-dense smte. The ad��ance <br /> out���sh d�pusiu can stand in steep cuts or natural slupes for e�tended neriod ��hen <br /> undi;turbed. \Vhrre esposed ��n slopes «ith poor ��egetation co��er and subjected to swnn <br /> runoCf or =ruund��ater seepage. the ad�ance ountash deposits can be �en eraduall� <br /> �roded and ma� slough and redeposit to a tlatter inclin�tion. llie underh'ine fresh <br /> ad��nce out��ash deposits in iheir nati��e. undismrbed state can pro��ide eood foundation <br /> ;upport��ith little settlement e�pected tur light to moderatelc hea�� structures. <br /> f3oth the \'ashon till and the ad�ance ournash deposits .ue quite stable and ha�e �en- <br /> hi�h io high bearin_ capa�it.. "rherefore. the nati�•e undi�mrbed Vashon till and ad�ance <br /> uut��ash suils ��ill be able to render adequate bearinR feundation suppon to the planned <br /> rocket� �rall. <br /> L1U & ASSOCIATES, INC. I <br /> I-�% i <br />