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� <br /> � SUBSURFACE CONDITIONS <br /> � Genera! <br /> Subsur�acc cun�itiuns :it thc projcct sii�� �ccrc ccaluat�.� bc drillin� cight hollo��'-;tem augcr burines tu <br /> � dcpths ran�;ing �i'um (iG.� �o S I S fc:L 'I�hc appro�imatc locations of thc borings are sho���n in Picurc ^_. <br /> "fhe loc:rtions of previous borim�s compleled by o[hei:s Ibr ihe esistin� parkine gur.i«e are also shown on <br /> the Si[e Plnn. A dcscription uf the field c�plorxtion �roccdurcs und lo�_s ot� l�onn_^_s �re pre,cnted in <br /> � \ppcndi� A. A dc�cripiiun uf thc luhorator}' testin�_ procc�iur.s nn�i rc;ults nf thc laber:non� tasts ;ue <br /> prusentcd in Appcndi� :\. <br /> � Soil Conditions <br /> Gencral. Subsurfac� suil, cncountcrcd in thc burin_^_s caisi�t of n diin I:n��r of lill occrlvin!_ �lacial till <br /> and dcnsc ta vcry dcnsc ach�unce out���ush. I lard ;ilt :ind �cn� dcnsc silt�� s;ind (dcp�;iu ���thc V1'hidbc�� <br /> � Pormutiun) �vere cncounter�d beneath thr �wt��u;h in thc n�c.tcrn purtiun of the sitr. �fhc ;oil unit� <br /> obscrvcd in Ihc borin�s arc described bclo��. <br /> � I�ill. Pill was cncuuntcrud in cach ofth�• l���rim_s �:in�ing fr��m I'rS t�� 9 ��ct �n thicl.ncss. 13orin�; I3-I <br /> and I3= wcre locutcd on the west sidc ol tlie propuscd Acutc Carc �Ib��rr and cncountercd a i- to <br /> 9- �i�ot-thickncss of luose to mcdium dcnsc gra��cl �vith silt and sand and sand �vith silt. [3oring l3-G �cas <br /> � located in the �outheast arca of Ihe pruposed parking garage and encountered .m S-li,ut thiekness o�stif7� <br /> w �cry stitt silt �ill. fhc rcmamin, burim_s encountcred a sur�icial �ill thicknr�s uf ; f�et or Irs> <br /> cunsi,ting o(lousc to medium densa silt�� sand with vui��in�; gr.n�cl content. <br /> � Glacial '1'iIL Glacial till ��as cncoantcred bcluw thc �ill in ;�II of dic burin��. l hc gl:��ial till tcpicalk <br /> consists of dcnse tu vcrv dcnsc silt� sand with eari:�blc amounts of era�cl anJ co6blcs. lhc �,I:icial till <br /> T c�tends to a dcpth of�l3 to dS �ict bclo�c c�istin!, ground surface a[ [he ��'estern cnd of the site (borin�s <br /> jB-1 and l3-'_). "Che bouom of Ihe elacial tili in die remaining borings was encountered at upprosimateh� <br /> ?-I to 3'_' fc�t bclu�v the c�isting ground surfacr. <br /> �d�aucc Ouhvash Ucpusits. r\J�ancc out��ash undcrlics thc glacial till :md ��cncrully consists uf vcrv <br /> �Icnse, tine to mcdium sand ��idi �ariablc amuunt; uf silt. \1%e interpret the ad�ance uut�cash to be 10 to <br /> �0 fect in thickness in thc borings complctcd in the west�rn end of the site (borim� f3-I .md [3-_). and <br /> j _�r�atcr than -I�-f�cl-[hick in the «mainin� borin!,s. <br /> ��'hidbev furmation. liard silt anJ �en densc sand with �ariable silt ��as incounter�d bencath the <br /> � advance outwush in borin�s G-I und [3? loc:ucd on the ���cst boundur}� ol the aite. �Ve interpret these <br /> 9 suils to bc dcposits of the Whidbe�� Pormaiian. I�i�_;ires ; th:ou�_h G prescn[ !�eneralized subsurt:uc <br /> ipruliles of tl�c sitc eonditions. <br /> i <br /> Groundwater Conditions <br /> t Prrcl��J gruundwutcr ��as obscncJ in threc o�thc ci_ht borin;�.s Juring �h�illin��; �t a �cpth of G lect in <br /> � bunng 13-_'. a depth of '_0 �cr� in buring 13-�. and a dcpth of I? fcet in berin, I�-8. .-AIthuu��li perched <br /> ��aier ��as unh obsened in tluee burings, moist to �cet soils �cere observed in sever:tl borines, especiall�' <br /> � bclow the glacial till deposi[s. �lonitoring ��ells ��ere installed in thc borin^s located ut thc corncn of d�e <br /> :nc (I3-I. I3-'_. 13-6 :�nd 13-5). Thrce ol the �ti�ells ha��e becn dq' ;inc� installatiun in e:irl}' June (l3-f. l3-, <br /> � :ind 13-b1. 13��rin� I1-S i, �urrcnth� inuccu,ible �luc to coiutructiun stuuim�. <br /> � <br /> I l�V.�\r lil 1'-u0;_�Irl -'---'- /'i/�C.i -'----- GEOENGINEEAS� <br /> � Jqi(lul 1.1'. =006 <br />