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Routing of cquipmcni on thc na�i��c subgradc soils durinc thc �ec� �ccathcr momLs will bc dillicult and thc <br /> suheradc ��ill likcly bccumc highly disturbcd and niucd. In addiiion. a signifir.uu amowu of mud can bc <br /> produccd by rouiing cquipmcnl dircclly on Ihc silts and da}'s in ��ct �ccalhcr. 9'licrcli�:e. �o protcct �lic <br /> tiuh��radc soils and to providc ;m adcqu:uc �eorking surfacc tiir dic coniractor's c,uipmcnt and lahor. wc <br /> rccommcnd ih�t ihc contractor pro�ccl csposcd suberadc soils ��ilh sand ar.i gra��cl. cnishcJ �ra�cl, or <br /> ATf3. <br /> Permanent Cut and Fill Slopes <br /> \Vc rccomnund Ihat pcnn:mcnt cu� or lill slopcs bc construcicd.0 inclina�ions o(311:1 V or Ilaucr. and bc <br /> hlcndcd into csis�inp slopcs �cilh smoolh ir.msitions. lb a+'hic��c unifonn compaclion. ��c rccommcnJ <br /> Ihat fill slopcs bc slighlly o�crbuilt anJ cul back Io csposc ��cll-compactcd lill. <br /> To reducc crosion. nc��ly consU uctcd slopcs should br. plantcd ur liydiosccdcd slwrtly alicr complction ol' <br /> grading. Until ihc �cgcl�uiun is atablishcd. somc SIOlILI110L and ravclling of �hc slopcs shoulJ bc <br /> ��pcctcd. fhis m;q� ncccssilale localizcd repairs and rescccling. Tcmporary co��cring, such as cican c�acy <br /> pinstic shcc�in�. julc I:ihric, or crosion cunirul blankc�, �such as Amcrican [scchior Curics I or Norlh <br /> Anurican Grccn SI SO)ruuld bc uscd lo prutcct tlu slupcs during periods of i;�infall. <br /> Utiliry Trenches <br /> Trcnch c�caration. pipc bcdJing. �md u�nch b�cklilling should bc complctcJ using ihc gcncral <br /> prurcdures dcscribcd in Ihc ?00(i \1'SDOT Sumdard Spcciliraiiuns or uthcr suilablc pruccdurr.s spcciticd <br /> ba Ihc prqjcct cicil cnginrcr. l hc sil�s and clays. �lacial dcpniis. and lill soils cncounlcrcd al ihc sitc arc <br /> ecncrolly ol'lo�c cunnsivity bascd on um cspciicncr in Ihc I'u�ci Sound arca. <br /> Uliliry trcnch back�ill sliould cunsis� of suuc�ural lill ,:ud should hc placcd in lilts of R inchcs or Icss <br /> (lousc ihickncss) such ihai adcyu:nc compaclion can hc achicccd througliout thc li1t. Sand backlill. <br /> comaining Icss Ihan $ perccnl tincs. m:q'bc compactcJ in loosc litis nut cscccding I� inchcs �ahcn placcd <br /> hclo�� tivc Icct of ihc linishcd ground surfacc. 13ach litl nmsl bc cumpacicd prior to pl�icinc Ihc <br /> suhscyucnl (iti. Prior to cump;iciion. Ihc hacktill should hc moislurc conditioncd to �cithin 3 perccnt o( <br /> Ihc opiimum moi,lwc runicnt. il'ncccssan'. Thc backlill :Lould bc compacicd in ;iccmdnncc ��ilh Ihc <br /> critcria Jiscusscd ahocc. Pigurc d illusiratcs rccummcndcd trcncl� cumpaciion critcria undcr pa�cnunl <br /> �md non-slrucwr;il ;irc;is. <br /> Sedimentation and Erosion Control <br /> In uur opinion. tlu crosion puicntial uf Ihc on-si�c xoils is lu�� tn modct.�ta Construcliun acti�itics <br /> including siripping :II1lI LI':IlII11L \1'III cxposc �oils to Ihc crosion cliccls oi��i�id :;rd :,.drr. Thc :m�ount <br /> and potcnli�d imparls ul cru.iun ;nc parlh� rcl:ucd to thc timc of yc:u that constniclion acluallv occurs. <br /> \\'ct �craihrr run,lruction�cill incrcasc Ihr amounl and cstent uf crosion and putrnlial scdinuntation. <br /> lirusion and .rdimcnt;uion cunlrol mc;isurcs may bc implcmcntcd bc usin� a cumhin;itiun ul'in�crccptor <br /> s��;ilc,, cva�� halc b�uricr.. sih (cncc. ;md su;ne tnulrh lur icmporai� crosion protcciion ul cxpuscJ soils. <br /> All distunc�d nrcas should hc linish cradcd and scedcd:is suon as prarlicnblc lo rcducc ihr risk uf crosion. <br /> [rusion and scdimcni:nion cimtrol mcnsinrs shuuld hc installcd and m;iin�aincd in accorda�uc ��i�h thc <br /> rryuircmcnk af ihc Cil� of f�crcU. <br /> l'ilr�n :rtn-un--uu PnR�'n �7EOENGINffI1S� <br /> � � .qJrl'.:nr�c <br />