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1 <br /> � ,Ircnelh in thc �Ic���oit ��f,;uil ;u ,�il�ctcd. In _cncr:il. ;��il; th:u ;re ;u,ceptiblr i�� liyuc�httian itulwlc crn <br /> luu5c lu nudium dcnsa cic:m tu ;iln� �;anJs th:u ;irc hclo�c th� �satcr tublc. � )ur nnal�sis indic;uc; thut th� <br /> � s'oils that underlie the pruposed buildinc urr:i ha�c :i h��� ri;l. ��f�liyucl�in_ bcwu:r ��I ihe .1�n;it� ut th�:e <br /> suils anJ the dcp[h to gruund��atrr. <br /> 1 Ground Rupture <br /> Geulogic maps indicate that the south \1�hi�bcy I,land Pault is locate� rouehic - inile� ;nuiln�r;t uf thc <br /> � ;ite. Decause ��( the thicknrss of the Quatern;u) sediments belo�v die site. nhich ;ur cemnwnk nuu� <br /> th;tn I,000 feet thick. thc potcNi:il f��r .url:iec �:iult rupt�.irc u considercd remotc. <br /> EXCAVATION SUPPORT <br /> � C',eneral <br /> � Site dc�cl��pment �cill r�quirr r�nwc:il ��(.>.i;tina huil�lin_;. ��;iccmrni;. rrtainin� ��a:l;. bwied util.itic,. <br /> and othcr structures prescnt at thc ,itc. Gsrn�ntion; r:m�ing �iom -40 to �U (cct «ill bc ncccss,uy tu ubuiin <br /> the proposed �inished floor elev.i[iuns. Suil conJitions encountercd within the planned escacation d�p�h, <br /> � consis't of a surlici��l laycr o( illl (up to 9 feet lhick) o��rrh�ing gl.iciall�� consolidated suils' (placial [ill, <br /> aJvancc oul�vash, and deposits of thc \Vhidbe} Fonnation). Pcrched grnundwatcr �vas encountcrcd <br /> durine drilling at depths rangin� Irom G to 20 �c�t anil �,iois[ tu �vct soils acrc obscn'cd in scvcral <br /> � sampl�s. <br /> ! <br /> ' �1'e expcct [hat the eoils encouatercd �vithin the proposed esc:nalion area nuq' be remuved ��'ith <br /> � comentional hcavy dutp e�c:rvating eyuipntent. Ilowecer, the glacial deposits are ven dense ;md contain <br /> � occasion:il cubblcs and boulders. The cunu'acror should be prcptired to escnvatc Ihese soifs and [o dcnl <br /> �cilh bouldcrs. <br /> � 13ased on the subsurface conditioiis uncou�itered and discussions' ��'ith the design team, ��e have identilicd <br /> se��cral options �or exca�:uion support at the si[c. Open cuts may be f�:isible on the east side of thc <br /> p��oposed parking g.u'�i!,e, soil nail shuring walls ��re .�ppropri:ue for thc ma;ority of the excavation ���herc I <br /> ; �pacc lintiuuiui;s prohibit upcn cuts, and soldicr pilc and tichack walls will bc appropriatc �chcrc <br /> ,idditional undarpinnine support ���ill bc requircd for thc c�isting PGh1C hospit:il and �tOB. Each o�`.hcsc <br /> altcrnatives are discussed scp�uatch� bclo��. This rcport presents prcliminary desien intbrmation for soil <br /> � nnil walls. If soil nail walls :uc ,electcd :i; thc preferrcd e�c:���ution ,upport option, Gcol:m_inecrs cr,n <br /> ��rcpare lhc suil nail ��all pltuu and spccilic:W�,n;. <br /> , � Temporary Cut Slopes <br /> F�x plannin� purpusc,, �;c recomnuund tunpor:u� cut +lopes in the densz to �erv dense glacialh' <br /> � consulidated soils be inclined no stecpar [h.m I I I:I V (hurizonta!n�crtical). �I�rmporan� cut slopes in the <br /> u��crlying Iooscr lill soils shuuld generalh� bc �nclined no steeper th:m I!�H:IV. A stceper slope, on [hc <br /> <�rder of I I L I V, may be used in the lill pruvided th� slope is �lashco�ued �vi[h '_ to -I inches ol'shotcrete. <br /> Il hc abu�c cut ,I��pc recommcndations apph tu cunditions ���here signiticant ,ecpage is no[ present. <br /> ` flaner slopes ma� be necessan if sieni�icant seepage is presen[ on th� cut Ihce or iF localized slouchin_ <br /> � occurs. �or open cut� ;�t thc sitc wc recommcnd that: � <br /> i . Vn �r:if�ic. construction eqwpment. stuckpiles or building ;upplies be �Ilo�ced :u th� top ol the cut <br /> ,I��pc, ��ithin ;i Ji,i;im� ��fnt Ic:i,t 10 �eet �iuin ihu top of the .ut. <br /> II <br /> . . ,. _.__ . . p,. ,/__.__ __ _ _—'___ _'_/'-!�� 6 --- GEOENGINEEflS� <br /> � IuC:::t:t :i,r,b <br />