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� <br /> � • In.tallin�� clu,cl�� ,p:�ecd certict�l wil nail, ur;m:ili >teel beams' (vertical elements) alum� [lic �cull <br /> ali�mncnt to minimize spallin,or rav�lin�s. <br /> I Contractors expericnced in the soil nailing me[hod shuulJ be able [o mitieate si_ni�icant spalline and <br /> r.rvcline cunditiuns. Contractors should also be prepm'ed tu use techniques to address preblcros that occur <br /> Iduc to cavine soils. The contractor should be made responsible for the safety of die shorine s�stem. <br /> Suil N;iil 1Vall Perfurm:�nce. A soil nail �vall is a passive shorine systcm ihat requires dcflection; I��r <br /> i lond to be applied to the ,oil nails. AVe recommend that Ihe soil nail be desiened such that acer;i�e ���ull <br /> � detlections bc limitcd to I inch and erowid surface setdements behind the wall be les� d;an abuut 1 inch. <br /> The deilections and scttlemcnts arc usuall} highest a[ Ihe excavatiun face and decre.ise to neeligiblc <br /> � amounts beyond a distance bchind the ��:ill eyunl to the escavation hcie�u. �Y:ill de�lcctions c;m b� <br /> reduccd by post-tensioning d�e upper ro���(s) of soil nnils. Localized deFlcctions ma}� cxceed the :iho�c <br /> cs[imates- nnd m�iy rcflect locul variations in soil conditions (such us around abundoned utilitics) ur m.:}� <br /> � be die result of thc �vorkmanship used to construct dre �vall. <br /> i <br /> � In addition to die above cstimulcd movement durine con:truc[ion ot thr wulL pennanent defonnatiun ��( <br /> the soil nail wall m;iy be c�perienced alier :m earthquake. Permanent deform;rtion o(the soil nail ��:ill <br /> � ���Ilowing a scismic cven[ �cill depend on the specitic desi¢n of the «:ill and is anticipated ro be minor <br /> � (Icss than about 1 inch). Pcnnancnt dcl'ormation of thc shoring systcm cun bc rcduced by stil�tim� thc <br /> ,��stcm (adding ndditional ur lonecr nails, post-tcnsioning the n;iils). <br /> � \lunitoring oCthc shoring systcm ,hould b� c�,mplctcd ;�: �I�,cril�c�l in :Appcu�li.� C. Cirowi� :An.:h�,r L��:i�1 <br /> I csis anJ Shoring Monitoring Program. <br /> � Drain:i�;e. n suitable drain;ige s�stem ;h�,ulJ bc insi;illcil to prc��cnt the buildup �f h��irostatic <br /> croundwater pressures behind thc suil nail �calls. Draina,� bchind suii n;iil ��alls t�picalh cuu,uu of <br /> � prefabricated geocumpusite driin;ige strips. such us �IiraDrainT�•'. installed ver[ic.�lly bcdveen d�e soil <br /> Inails. The draina_c strips are qpic;ilh a mininuun of IG inch�s �cide and e>:tend [hc entire heieht of the <br /> �vall. llori'r.ontal drainage suips may al,u bc used in areas �ehere perched !_round�vater is obsened. at <br /> � cold joints in permanent top-du�vn basement wall cunstruction, or for uUtcr re.�son;. A1�e rccnmmend thx[ <br /> � �Ir;�inacc strips be con:ieetcd to .i tightline pipe installed alonc the base uf the �call ;uid routed to ,i ;uii,�blr <br /> di;diarge point as described in the "[3clow Grade �Valls" section of this report. <br /> � Suil Y:�il �1'all Cunlr:ict. T�picall}' the bid on the sho[crete wall is bascd on an usswncd shutcrcte ��all <br /> thickncss. Spulling und ravcling of thc cut facc durim� cunsn�uc[ion cencr:ilh� result in suil nail «nll <br /> I euntractor chancc ordcrs. Accurdingh, «'c reconunend that the lulla��in, items be cunsidcred in order to <br /> reducc th� cust imp;ut of changc ordcrs and ta limit thr owncr s liabilit�' «ith rceard [o change ordcrs. <br /> The contr�ct should include unit prices lor shotcrete ovcrbreak (cubic yards) and �lashcoatin� <br /> (;yuare-loot ol wall tacc). "l�he unit prices shuuld incluJe all costs assuciated �tiith materials. placcment <br /> I anJ labor. \Vc recommend diat Gcu6ngineers revicw the contract on behalf of the o�vner to �ce that the <br /> risk ;ind liabili�y of putcntial chan�se orders are :iddressed ;�pprupriatelv. <br /> Soldier Pile and Tieback Walls <br /> i <br /> Suldier pile and tieback wulls nuiy be considered to retain the e�c:tvatiun or for dircct underpinning <br /> ;uppor� along the wes[ and suuth shoring wall udjucent to die �IOD and esisting hospi[al L•uilding. <br /> SolJier pile �valls consist of stcel bcams that are grouted into drilled venical liules located ;ilom� the w:�ll <br /> ;ilignmcnt, npicallv 8 Feet un center. Pollowin, esca�'a�iun to spccitied elevations, tiebacks are installyd. <br /> i <br /> � <br /> � Pa,�e' 9 GEOENGINEENS� <br /> � . .�.\,� IlI'�8-qqJ.dO <br /> c, <br /> ( .�lu.iur I':. :�rdn <br />