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Pru�id.J ihr .lab. ;ur run>trucicJ un a lirm ;mJ um i�IJinp .ub�radc. ih� .lahs can hc Jc.i�ncJ u<ing a <br /> mudulus ol uib�i;idt ���aCtion u�5(1 �wunds�ic� cuhic in[h. <br /> 4.7 RETAINING WALLS <br /> 4.7.1 Deslgn Paramefers <br /> II'Juck-hi�h w.dls arc wrd in Irurk Iu:iJing arcas Ihc}. �huuld hc Jcsi@ncd .is re�aining��vlls. I� is I�pical <br /> tlru sudi w.illti ;uc nul s�ructurilly restrainc.l: ihcrc�iirc, ac�irc latcr;il c;inh pressures :,�� �r���,r��;��� lin <br /> Jc,icn uf thc �calls. 'I'hc��:ills ��ill alsu likch- hc surchargcJ h�� lirc load+ Gum cyuipmcnt uscd tu unluaJ <br /> Jrli�cry trucks:mJ pustiibly hy �tuckcd mcrchandisc. <br /> I I�c rctaining �valls should bc dc+i�ncJ w ntiisi latci:il soii pressures cyuul tu an cquicalcni Iluid Jcn�it� <br /> ul ;5 pc(. If thc �nps uf �hc ��';dls ��'ill hc s�ructurally rcti�raineJ. I�ncr.il soil pnswrcs cyual �u :m <br /> cyuicalcnt Ouid dcnsiry of 55 pcf shuulJ hc uscd. \�;ills arc ussumcd lu bc restraincd if lop ma�cmcm <br /> during backlilling is Icss thun II!IU011. �nc�rc I I is Ihc wall hcight. Additiunal 6dcral prctiti��res shuuld hc <br /> ,uperimpuscd on ihc suil prcssurc to arcuunt for swclu�rges. \Vc rcconuncnJ assuming a unifomi latcrd <br /> prc�surc uf 100 psf liir cyuipmcro surch:vgcs and'ur slackcd mcrch:mdisc. "I'hi� �:iluc atisumrs thc <br /> ronic;d surch;irgc Io:iJs�vc Icss than aboul }UO psf. <br /> lltc ealurti for tiuil hr,iring. liictiunal rctiitil:mcc anJ patitii�c rr.sisl:mcc prescnicJ ahu�r li�r fuund:niun <br /> dc.+ign arc.��rr�;�i,ir tu iruiining ��all JrsiEn. <br /> 4.7.2 Dralnage <br /> l�hc :arontnnndcJ d��iEn C:u"Ih pi"Ct.ulCs.u�unlc IhC ��ulls ;u� nul suhj�i'IrJ �u hydruUalit prcatiures frnm <br /> ��;ucr huilJing up hchmJ �hc ��allti. ISccamr thc Jnrk-hi�h ��alla at �hc Iruck lo:iding arcas �cill nw bc <br /> csposcd w rain. �ec du nu� anliiip;rtc ihal �ra�cr ��ill builJ up hchind thc ����Ils. Nc�cnhcic:�, ac <br /> rccummcnJ ihai �hc h;ic4��!: �eithin '_ lici uf ihc �ralls cunsi,t o( Gco-diaining matcrial ns shu��ro on <br /> PiEmr 7. �fhesc ���;dls Ju nul riyuirc a perliir;ucd cnllcciur pipc �rithin thc Ircc-draining nuucrial. <br /> I(rvcriur rcu�inin�; a�dls arc lu hr cu�istrucicd. �cc rccuntmcnd thal h:icktill �cithin ? fcct of��alls cunsist <br /> ul' tirrJr;iining tn;urrial. 11'c alsu recummcnd installing �� 4-inch-diamctcr perfiir.ucJ cullcclur pipc <br /> ��ithin th� (rcc-Jr::ining matcrial :it ihc h;isr u(ihc ��all. 11'c rcr��mmcnd �.ising cid�cn c�:ny-�vall .olid <br /> pip� Itiuch ;u I'V(' Sf)R i5) iir rigid rurrug:UeJ pul}'�Ilt)irne pipe Itiuch ;is ADS NI'_1. \\'e rccummenJ <br /> ❑�:iinst ��sinE �lc�:ihlc tuhing ti�r ��';dl drnins. A t�pirnl ��;dl drain;igc and h;icklill dctail is sho��n in <br /> I icure 7. <br /> 1 hr pqre shuuld hc IaiJ ��ith a mininwm slupc uf unc-Ic�l(perccnt :mJ Jisrh;ir�c intu thc sturm��:ucr <br /> .��Ilcctiun sysicm w cumcy ihc ��;ucr ut7'-siic. I hc pipc insuillations shuulJ inrludc cic:muut riscrs �ciih <br /> r���crs. 1Vc rcrummcnd againa� Jiarharging roof dmcnspuWs in�u thc perforatcd pipc pro�iding �eall <br /> Jrainagr. <br /> \hcrnaticch. �hc csicriur ��alls can hc proridcd�cith �recphulcs tu di,chargc�c;ucr from thc frcc Jraining <br /> ��all harklill m.ucrinl. Ihc �ccrphulrs shuuld hc ? inchcs in Jimnctcr, und spaccd ubout c�'cry S Icct <br /> ecntrr-R�-.rntrr:dunc the b;nc ul'ihr ��:dl,. l he��cepholes shuuld he backed�vi�h Ealr.:nized he�iey uire <br /> ;nr.ii io �,r.�rnt I�i,s ��f ihr ha.l,lill m:rt�n:d. <br /> .:. \._ .,. , : .,, ..—_ _.-__-__-- !'uA� /9 -- GlOENGIMF[I1f� <br /> i <br /> �..� , _i _ ��_ <br />