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i <br /> Il'hc above soil pressures assumc that wall drains will be installed to prevent the buildup of hpdrostatic <br /> pressurc bchind thc walls, as discussed bclo��'. <br /> IDrainage <br /> Drainaee behind the permancnt bclu�v grade �valls is t}�pically pro�'ided usii��e strips o���:aina��c matcri�.ii <br /> attachcd to thc la�_gin�: behveen the soldier piles or located behind the shotcrete facine of soil neil ��,ill <br /> lhc drainage materi:il strips should be connected to �veep pipes which estend throu;_h the perinic;�, <br /> Ibuildine ��all at thc (botine ele�:uion. The �vicep pipcs should be hydraulicall} cunnected ro Ute swn��. <br /> , and m:ry be designcd ibr a hard conncction to the perimeter ('ootine drains discussed above in "i3elo�� <br /> Slab Drainagc." <br /> � The carth prcssures presented in Pigures 7 and 3 ass',une that adcquate drainage is providcd behind thc <br /> walL As discussccl prcviousl��. preGibrica[ed ccocompusitc drainagc strips, such :u �liraDrainT", s'houlJ <br /> i be installcd venically between the soldicr piles and behiud the sho[crete facing of' soil nail ��alls. Thc <br /> drain:i_c sU'ips shoulJ be ins�;�lled on thc cxcav:uiun side of the la�_ginc ��ith the fahric adj:icent to tlic <br /> la�;�,ing. Thc drair,a��e strips are typically a minimum of IG inchcs ��ide and �stenJ the entirc hci�,ht of <br /> the �call. Additi„ual dr;iin;ice ,trips nun� be neeessan� in ��'et :ireas. :A t�picul ;chcmatic of thc drainagc <br /> � dci,iil is providu�l :is Pi��urr I l. AV�c r,timutc thc tuinl diseliar_�u Il�om thc �call druin;i�c s�stcm «ill bc Ics; <br /> ' than ISgpni. <br /> �, Positi��e dr:iinnec shcul�l ul;�, hc procidcd behind c.ist-in-pl:iec r�taining ���:ills bc plaein_ a <br /> ( minimum ''-li��it-��idc ronc uf \1'SDOT Spccilic.itiun 9-Oi.l'l�l. Gr;n�el I3:icl.till �i,r A1',�Ils. Thc <br /> draina¢e backlill zonc should extcnd from the bnsc of the ��'all to �vithin 3 �ec[ of the linished ��round <br /> � surfnce. �I�he top 2 �cet of till should consist of relativeh� impermeable suil to precent intiltration of <br /> ' surface �vatcr intu [he wall dr�inage zona A •l-incli minimunt Jiameter perfurated pipc sliould be loc:ucd <br /> a[ thc basc uf thc ��:ill in thc ��rn��rl b,ick�ill tu rcmuca �catcr thai collcc�s in thi, zonu. Thc dr:iinpipc <br /> ( shuuld bc pluccd �cith 0.� prrccnt minimunt ,lunr� ;m�l dis�hur!� to :m ;y�propriatc luc:uiun. <br /> � <br /> EARTHWORK <br /> ( Subgrade Prr.paration <br /> � Thc in-situ soils at thc planncd �inishcd �loar und luotine cicvatiun nppc;ir tu consist prim�uih� uf ��en� <br /> densc sand �eith silt o�cr the majority of the site. liard silt and vcr� densc silty sand is ;mtieipated in thr <br /> �vestern si[e urca. �fhc exposed s'ubgr�dc in structurc and pa��ement arcas should 'be evaluared 'aftcr site <br />, I exc.n-ation is completa Dis[urbed arcas should b� re-cump;uted if the sub�_radc �oil consists o(granular <br /> material. If thc subgrade soils consist oP diswrbed silt or cl.n'. n will likeh be nece;san' to renwve .utd <br /> replace thc disturbcd soil �sith structur:�l till unless th� soil can be :�deyuately meisture cunditioned and <br /> � compacred. �As discussed in [hc "Shullu��� foundutions" section, placement of a le:m concrcte "mud ma[' <br /> is roconunendcd to protect fuoting subgr;ide fl'om disturbanec. Uisturbcd areas belo�v planned <br /> � foundations supportine thc :Acute Care To��er or e;ir:iec ;huidd hc rcmu��ed a!id replaccd ��'ith lean <br /> cuncrotc. per At'SDO'l� tit:�nJurd Spcci�ic:ui�,n 6-U�.=(')D. <br /> i <br /> i <br /> Structural Fill <br /> 1 ill place� to su�,p�,rt structures. pl:i�cd bchin�l rctainim� su�uc!urc,. nnd �>I:ieed bel�nc p;ivements und <br /> ' �itl���:ili:; ��ill n�'cd l�� bc >��ccilicil us ;fructural fill ;u �le�crihcd bciow: <br /> i <br /> I -- -- -- -- ---- ------- — <br /> ' , ,� �p-;�_,�p+.,��� PI(;�C IG GEOENGINEERS� <br /> i <br /> :trr2�nl i Y. _pUp <br />