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ihr E������ri�i. ,i:� in:;i�urr�l iri�in thr h.�rl: i,� ihc �call Ll��c�;. �cill hc I�J �i•ct I��ng tiir tl�c �r..i.�imuni <br /> r��,�ucJ wali hcight uf 1 G �ccL (If cunditions or gr�ding changcs rcyuirc wall hcights grcatcr <br /> ih,n I G fcct, the wall dcsign cnginccr, BGC, pllc should tn; contactcd to providc a dcsibn <br /> i��ision.) As thc wcst wall steps up the slopc from the low at the northcast comcr, the grid <br /> Icn��:��s ,u�y tx shortcncd to RO pcn:cnt of thc wall height as thc �vall hcight dccrcascs. "Ilic <br /> ���•ugrids must bc placed horizontally and at thc proper intcrvals as specified on ihc wall secu�m <br /> dctail. Thc maximum vcrtical spacing betwcen laycrs of geogrid rcin}'orccment shall be�4 <br /> inchcs. 'I'hc minimum 2d inchcs of embcdment malerial in front of thc wall must be excavatrd <br /> �lc��vn into nativc sedimcnts and thc cxcavation shall bc cut as closc to Qic facc of'thc �,,,II :��: <br /> �u�ssiblc such that minimal spacc IxtK�ecn thc wall basc:uid thc cmbcdmcnt soil occur:. <br /> I hc manufacturcr's ncommcndalions for placing and �ssemhling wall hlocks should hc <br /> (ulluwed at all timcs. 'll�c pmccss of placing rows of walls blocks, placing drain rock, <br /> b;ickfilling:uid compacting t!ie fill, .ind placing layers of geogrid reint'oreement ���ill Ix rr�,r;��c�1 <br /> ���:til achieving tFc planncd wall hcight. Eac1i l:�ycr of�tcogrid slintild hc tcmp�rarily �I;�E.r�l t�� :i <br /> t:�ut condilion priorto placing soil backfill �m t�,�, ��I�iL I�:rr��in;� �I�r �t����rriJ i:�ut ���ill i�:,lu�:� ili� <br /> ����irntial for post constructian wall movemrn�. <br /> l hc gcogrid choscn forthe wall ainalysis w:�s �u:na;�ri�_i �n�i ar.�l t�r� :iunc ���.,II hl��cl.� . t)th��r <br /> L,cugrid .utd hluck m:inuL•icturcn arc a�cc�laLlr: li<�( '- I,II� �.h�ml�i hr �i,nt;ictr�l tu :qi��t����� ;in <br /> cyuivaient �Ircnyth rc�,i�rid li��m thc cL���cn I.raml ;in�l �rril.� accc��iahilit�� �aitli ihc �i�r.�•ntal <br /> w,ill dt�sign. <br /> l�hc appro�im:itr 1: iuch :��nc iiunir�(iut�l}� hchiuJ thr «�:ill hlucks �vill cun.i�l ul�drain r���:k. <br /> I�his drain rock shall bc cican, I�rce-dr:�inin}�, cn�shcd rock with a m.uimum di�mictcr ol 1'�: <br /> inches. Pree-draining is defined as Iess than 5 pereent passing the No. 200 sieve when measurcd <br /> �m t hc minus N4lraction of the totul. Nea gravei or round, washed drain rock may not be uscd in <br /> Ihis ��•all drain zone. A 4 inch dimnetcr perforated drain pipe should be cmheddcd at thc base nl <br /> this drainagc column of rock 7'he piEx:dischargc should bc out the t'ncc or around the cnd uf ihr <br /> ��:dl at thc low point (ur points) ofthc foundation cxcavation. I�he Jischargc should thcn hr <br /> tii.htlincd to thc loc of thc slopc. IConsitc soils:uc uscd for swctural fill wilhin thc �v,ill <br /> h.�rklill zonc, it will bc ncccssary to cstablish a sccond:try"chimncy drain" bchind il:c <br /> icinfbrocd lill. If a cican, fi�ce-draining, imporled sand :vid gravel is used to conswct thc <br /> rcinfbrced wall 6il the chimncy drain ���ill nr�t be necessary. The need for a secondury dr:�in ,�ill <br /> 1��� dctermined at the timc of constrvction based on the perccntage of fines in the �aall b.irk til I <br /> ��,il being uscd. <br /> I l�c consWetion of the wall should be completed by a contr.�ctor with experienec in <br /> :unstruction c�f scgmcntal block wall systcros. 7'hc structural intcgrity dcpcnds on �n������ <br /> placcmcnt of wall system components and compaction of the wall back6lL A tcnrescntaii.r ��I <br /> this firm should providc ovcrsight during construction to vcriCy compliancc with thc design <br /> detail and for quality control purposes. It will also bc ncccssary to have a testing laboraton <br /> providc in-situ dcnsity tcsts to verify thc sUvctural compaction of the backfill. <br /> It should also be understood that all segmcntal b.ock walls move some small amount lateral ly <br /> ;dler construction. 1'his movement is ncccssary to achievc the passive canh pressure betwecn <br /> thc stn�cturnl lill sciil :uid Ihc i��u�rid reintiirccmcni. lutcr.�l w.dl movcmcnt ofalmut 1 perccnt <br /> uf thr ���,ill hri,�ht m:i•,� ��ccur, 1����ic�illy �lurin��. lhc tirst ��c.i� .ilier a�ntE�lelion ul�the �tiall. <br /> � <br /> I1( I� '. ��Ilc 1�73i�7 ;'.�1�)''' :�t�cnurNl�:. AV���otlin�'illc. l�'�19R0?7 (425) 27i-5p(�) �� <br /> Js <br />