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I. Sinictural lill placcd io constnict parking mras. to backtill utility trcnchcs and to suppon building <br /> and iloor slahs should cunsisi o1'imporlcd gra�cl borro��•as dcscribcd in Scction 9-03.Id11)of Ihc <br /> ?UO(, \\'ashincion Statc Departnunt of Tnnspunation 11VSDOTI Standard Spccifications. ��ith <br /> ihc :iddiiional rcstric�iun that thc tincs contcnt bc litnitcd ln no ntoro Ihan $ perccni. On-sitc sill <br /> and clay soils arc not suilablc ti�r usc as su2ictural lill. On-�iic elacially contiulidared wils lsilty <br /> >andl ���:q' bc uscd pro�idcd Ihat thc soils arc condi�ioned �iir ihc rcquircd compaction. <br /> ?. tiuvctur.d fill plarcd immcdiatcly oWsidc 6clo�c-gradc ��:dls �drainagc zonc) or around 1'ooting <br /> dr.iins chould cnnsist al washcd 3/8 inch to No. R pca gravd or confonn to Scction 9-03.12(41 0l' <br /> ihc 2006 \VSDOT Standard Spcciticaiions.as sho��n on Figurc 3. <br /> 3. Strucwral till placcd as crushcd surl'acing hasc coursc bclo�� pavcmems should conl'unn to <br /> Scction 9-0;.9 (31 of ihc 2006 \VSDOT St:mdard Spcciticaiions. <br /> d. Struc�ural lill placcJ as rapillary hrcak bclo�v sl:ibs shuuld consisl of I'h-inch minus cican <br /> cnishcd Lra�cl ��ilh ncgligihlc snnd or sill in cunlonnancc ��ith Scc�ion9-113.1(41G gradin� <br /> No. 57 o(thc '_OOG \VSDOT Standard Spccilica�ions. <br /> Rcusc of On-xitc tioilx. Mos� ul'ihc ncnr surtatt on-silc soils consis� ol'lill. sihs and clays. and na�ivc <br /> silty sand dcposi�s. ��hich conlain a liigh perccnlagc of lincs. Conscqucndy, most of thc un-siic soils will <br /> no� hc suilablc tor rcu.c as �uuclural till. Suilablc cl;icially cunsalidatcd silly sand soils may bc uscd <br /> durin� ihc d�� .umnur munihs: hwrcvcr. unly a localizcd arca may hc cncounlcrcd durinc consuUc�iun. <br /> I:sisling sand and era��cl lill may bc rcuscd il'scpar:ucJ during csca�:iting and il'not conlaminaicd �vith <br /> lincs. I:xisling sill and clay dcposits shuuld nut bc rcuscd as stnictural �ill on thc sitc. <br /> On-silc naiicc silly sanJ dcpusits arc cxpcc�cd to bc sui�ablc (or structural till in mcas rcyuiring <br /> compnctiun io at Icns� 90 perccnt uf MDD (pc� ASl��1 D ISS7), providcd lhc ��ork is accomplishcd <br /> during Ihc normall� dn� scason (lunc Ihrougli Scplcmhcrl and �hat thc suil c:m hc properly moisturc <br /> cunditioncd. ❑ ma�� hc ncccssary lu impoil sand and griccl �ci�h a lo�� lincs cunlcn� tu achic��c adcyu.Uc <br /> compaction tiir suppui7 ul parcnun� arcas, iluur sl:ibs :md slructurcs liir ��ci ��calhcr constniction. <br /> Impurtcd sUvctural till cunsis�ing ol'sand and pra�cl (\YSDOT graccl horro��•) shoidd bc planncd undcr <br /> all huilding �lour slabs;md liiund;Uion cicmcros and il�cunsiniclion occurs during��cl �acalhcr. <br /> Tlic conlraclur shoulJ plan lu coccr and mainlain all �ill slockpilcs ��ith plastic shcctinc if i� �vill bc uscd <br /> as strurtural lill. l'hc rcu.r of un-sitc soils is higl�ly dcpcndcnt un thc skill of Ihc cuntractor and schcdulc. <br /> ❑nd�cc �eill �curk �ciih Ihr Jcsign icnm and coniractor tu masimirc ilu rcusc of an-sitc lill soils during thc <br /> �crl and ch'v sc:isun.. <br /> Rcuxe of Ecisliu�;Asphall and Concrctc Rubblc. lixisting asplialt pavcmcnt, basc coursc, and Ponland <br /> ccnunl concrcic ruhblc may bc rcuscd as slrucniral lill if pruperly crushcd during dcmolilion. Rcc�dcd <br /> a.phall paccmcni should nol hr uscd as sUzictural lill widcr huilding timndalions. PorAanJ ccmcnt <br /> cuncrcic ruhhlc and basc ciwrsc m;ncrials may bc rcuscd as suuctural till Iluoucliow ihc projcc�. For usc <br /> ;is ecnrral �u�ictural IiIL �hc asphalt and concrcic ruhhlc +hould bc crushcd or oihcnei�c ground up and <br /> should mccl ihc crad�Uion rcyuircmcnts liir gr:icd burro��� as dc.cribrd in Scc�ion 9-0?.la(I1 u(ihc 2006 <br /> \1%SDOT Standnrd Spccilic;itions. Il�rcryclyd ;isphnit and/or cuncrcic ��ill bc u+cd undcr pa�cmcni arcas. <br /> ��c rccumnunJ Ih;n ii mccl ihc gradnlion rcquircmcnls tiir cnishcd surliuing basc coinsc as dcscribcd in <br /> Srclion `)-U3.9�3)ol'�lic ?006 \1'SDOT Slandard Spccifica�iun�. <br /> I�ill 1'laccmcnt and Cnmp:ictioo Critcri.�. Slniclural lill .huuld bc mcchanically cumpactcd to a linn. <br /> nun-yirldinc condilian. ti�ruciural lill shoulJ hc placcd in loosc lilts not escccding 8 to 10 inchcs in <br /> tliiekncss. 'fhc ;iciu;il ihicknr�s �cill hc dcpcndcnl un ihc su'urtur;il till mmcrial uscd and thc qpc and sizc <br /> l ih \,�. �.�?o�rur.un /'nA�'h GEOENGINEE�� <br /> - . .pdi !'._um .. <br /> ��. � _ <br />