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( <br /> � Perched ��round«atcr is common in �,lacial till so�ls n'herc water from precipitation percolatcs throueh the <br /> weathercJ ponion ancl moves lateralh� on the ver}� dense. un���eathercd portions. Pcrched water ma}� also <br /> occur within the Advancc Out�vash and �Vhidbey dcposits where Iess permeable silty la}�ers exist. We <br /> � espec[ tha[ perchcd eroundwatcr Ie��ls «ill tiucmatr scasonally ��ith precipitation. <br /> � CONCLUSIONS AND RECOMMENDATIONS <br /> SUMMARY OF KEY GEOTECHNICAL ISSUES <br /> � [3;ucd on thc resulu uf our subsurf:�ce c�plor:uion pro�sram and �scotechnical .tnah ses, subsurface soii a �,l <br /> �,��oiii���vatcr conditiuns �irc fn�'urable for constniction of th� Acute Care To�ver and Pnrkine G:ir;i_� <br /> t ProjccL :\ sumin;u� uf the primary ecotcchnical considcratiuns is providcd bclow. l�hc swnm:u� i. <br /> Ipresented fur introductory purpuses onl� and should bc used in conjunc[ion with the complc�r <br /> rcconuncndations prescntcd in dtis report. <br /> � • Subsurl�acc soils cncuuntcred at the site consist of tbur ;eologic units: till, glacial till, ouh�a;h <br /> dcposits, and deposits of dic NhidLcy Pormation. '1'hc f ill ran�,cs from 3 to 9 �ect in thicl:n�ss. <br /> • Pu'chcd ��rounJ���atcr ���as obscrccd in Ihroc of thc cicht borines during drilline. Four monitorin_t <br /> � �cells were install�d at the corners of the ezcavations. Three o([he ��ells have been dn sincc <br /> installation in lune '_00(. The fourth well, borin� B-8 is in.iccessible due to cons�ruction staeine. <br /> • "I he site is desien:rtcd as seismic Site Clas's C per the ?00G If3C. <br /> I • A cumbination of shorine techniqucs �vill likely bc the mos[cost ef�icc[ivc fur this site. Open cuts <br /> • m.rv bc �c:isiblc on thc cast sidc of ihc proposed parkinc �,uragc if condi[iuns ;�Ilow, suil nail <br /> shorinL walls are appropriate for the majority of the e�cavation �chere spacc limitations prohibit <br />�� � open cuts. und suldicr pile :md tiebeck walls �vill be a�,propritite ���here additional underpinnine <br /> support will bc requircd fur thc c�isting P[{`9C hospit:il and i�lOL3. Partial shorinu ��'ith slopine <br /> backlill niav :dso bc considcrcd �ch�rc lintitcd spacc i� 1VelI9�Il` (ur opcn cuts on [hc cast and <br /> � north ���ulls oftlic g;uage. <br /> • '�hc pl,mncd buildine can bc supportud an spread foutim�s or tnat lound:i[ions. Allow:�blc bcarin� <br /> presstncs .irc prescnted in tcrms o( estima[ed settlements frn' �'sri�ble (ound•atio�i sizes in <br />' � Pi�urc 10. <br /> • "I hc lowcst Icccl can bc eonstructcd as a sl��b-on-�sradc. <br /> 1 • vVc rccummcn�l umlcr<I;ih aml prrm;inrnt ��all druinagc mcusurcs b� incorporated into thc dcsi�_n <br /> to capture �,c��hr�l ui��uwl��;t��r ;����,;i_r .�nnm��n in du elacial �!c���"iu :in�l �,h.cr�.���I in Ihc <br /> borinc>. <br /> � EARTHQUAKE ENGINEERING <br /> � Seismiciry <br /> Scisnticin in �cc,icrn \1 ,uhin�nm u �,nn'�arih �iric�n b� thc Ca,c:uli;� Suhduction Zunc. ��hich i, thc <br /> znnc whcre thc �ccshc:u'd ad�ancim� North :�mcric:m Platc is o�crriding du subduc[in� Juan dz Puca <br /> ( Plate. l�hrec potential scismic wurce zones are ��enerall� :iccepted for �restern �1'ashim�un: (l) shallo�� <br /> � �rustal c.irthquakas assuciatcd with kno��n and/or unkno��n faults: ('_)C:�scadia Subduction 7_onc <br /> in[cr�acc cartl�quak�s. which �,ccur alom_ thc boundan lur.u�d bct��cen thc Juan dc Fuca :md \orth <br /> � Aiucricnn plates: and (3) Casc:i�i:i Subiluetinn Zonc imr;�pl;ne e.irthyu.�kes. ��iiich occw �cithin the <br /> wh�lucune Ju;m �k Fuc.i Pl:u�. <br /> � <br /> - ---- -- __ _--- - ------- <br /> � , , , .,, lii fi.::r��-�R� PII�C�J GEOENUNEERS� <br /> �, � <br /> �hn?m,l ;Y 'p�l�� <br />