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( <br /> � . �'u���.tiiu�..l Ifll ��Lr.. �l :i:eu:u, � :iln,�"�.�_, ,. ..liic ..r.iic- :,i�,�� � ila:��l,il� ��:in. .i ��u!,I ni��:� '.hc <br /> rcquirrmcnts of \1�SUOT �pccilicatiun 9-0:.1:( 1). Gr;n�cl 13uc{:fill I��r I)r:iin� ��r cuniist ��� pra <br /> I ��rit cl. <br /> • Structural till placed tbr cast-in-place ��'nll drains should mcet the requirem�nts of 1VSUOT <br /> Spcciticatiun 9-03.1'_(3); Gruvel Hncklill for AValls. <br /> j • Structura! fill pl.�ced as capillar} break matcrial below slab-on-�zrede floors should meet thc <br /> requirements of�VSDOI' Speci�ication 9-03.17, Foundation �taterial Cluss A. <br /> � • Struchiral IiU pl.iced as crushed surfacing b.ise course bclow pavements and sidc��alks should <br /> ; mcct thc rcquirements of�«'SDO"f Specificution 9-039(3), Crushed Surfacing Pase Coursc. <br /> ' On-sile Snils. fhe un-site soils are muis�ure sensiti�e, tine-��rained soils that �vill become ea�ih <br /> �. disturbed when �veL Q.ised on our labonton- testim_. the majurity of the escav�ted soils «ill likel} ha�c <br /> in-situ moisture cuntents near the optimum required �i�r cumpaction. 1lo�vever, the soils contain <br /> I escessive fines and do not nuet the �_radation criteria specilied aboce Cor use beneath footines ar.d siubs <br /> � .md in drainaee zoncs. If the conu'actor wishcs to use on-site soils lix structur:d till in ethcr arc:i;. <br /> Gcolim,inccrs c.m cc.ilu;uc thc on-sitc soils for suit;�bili[y as suuch�ral lill. <br /> Irill Placemenl :u�d Compaclion G'iteri:�. Strucun'al till should be mcchanically :ompacted to a tirm. <br /> non-�icldin� condition. Structural till should bc placeJ in luosc lifis no[ c�ccedin, I foot in thicknr., <br /> ��hen compactcd using hcrvy compaction equipment. Loose lifts on the order of�1 to 6 inches ma� Lr <br /> necessary �vhcn h:md compaction equipment is used. Bach li�t should be conditioned tu th� pruper <br /> moistwe content and cumpacicd to the spccificd density bef�re pl;icine subscqueN lifts. Structural tlll <br /> should bc cumpactcd to thc follo��inc critcria: <br /> I . Structural lill pl;�ccd in building areas (suppurting li��hllt' loadcd fnunda[ions or slah on gr;i�r <br /> iloorsl and in pa��ement and sidewalk arcas (including utility trench backfill) should br <br /> � cortipacred to at least 9� percent of the musimum dry density (�IDU) estim;i[ed in accordancr <br /> I ��ith :\S"I �t D I i>7. <br /> . Su'uctural till placed against sub�_rade ��:ills ;houlJ be cumpacted to bet��'een 90 ;md 9_' percent. <br /> ( Care should bu taken ���hen c„ni��;i�tine till ac.iin�t ,ub,url`,iee ���alls tu ;n�oid ucer-compactiun <br /> and hcncc uvrrstressing thc �c;ills. <br /> , A1'u recoiuincnd th:u Geo6nginecr; he �n�c:rnt �lurine pr,rot=rollin_ ❑nJ!or probine of thc �.�poscd <br /> � ;uberade soils in buildin� and pa��cment urca�. :uul pluccment of svuctural till. AV'c «ill ecaluat� th� <br /> adcquacy of Ihc suberadc soils and idcntih ;�reas- nceding Curther��urk. perform in-place muisture-density <br /> tc,u in the �ill to verifj' compli:uue �vith [he compaction specitic�tions, and :idvise on any mudilicatiuns <br /> tu th� procedures which mac be approprinte ror the prevailing cunditions. <br /> � Wr.�ther Consider:itions. The un-site soils contain a ;ufticien[ percentage uf lines (silt ;md clay) to b� <br /> moisture scnsidvc. When the moisturc content o( thcsc soils is more than a fcw percent abo�'e thc <br /> optimum muisture contcnt. thcse suils beconu mudd� and unstable and operation of eyuipment on these <br /> � soils is dil7ieult. :\ddiuon:ill�. disturbance uf ne;u' sur�ace wils should be e�pected if earth«nrk is <br /> complereJ Juring periuds of wet ��cathcr. Durim� �cet �vcather. wc recomntend tha[: <br /> • l he cround surCace in ;md around the work are;� should be sloped io that surGtce �va[er is directed <br /> .nv:w tYom the work arca. l he �round iurGue should be graded such th��t areas of punded water <br /> � do not de��clop. ��te.isures ;hould be takcn b�� the contr:�ctor to pre��cnt ,urface �vater ti�um <br /> eollcctine in e�c:n;uion; aml u�nchcs. \Ir:uur�s ,liould b� implemcntcd tu rcmovc sur(zcc �vatcr <br /> fiom thc work arca. <br /> � <br /> �.i(:1n l0"3.�'-rJU�l/U -- �— — _"-- "�'����"�--'— GEOENGINEERS� <br /> . i�;ue� I1. 'OrIG <br />