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Thc wct wcathcr scason gcncrally begins in October and con�inucs through May in �.vcstem Nashinoton; <br /> ho�vever, periods of wet wealhcr may occur during any mon8i at the ycar. For earih��vrk ac[i��itics <br /> during wel wealhcr, wc ruomntend that thc lollowiny steps hc taken: <br /> • The ground sudacc in and around the work arca should be sloped so that surface wa[er is directed <br /> away fmm thc work arca. The ground sur(o!ce should be graded so thnt arcas o(ponded wuter do <br /> not devclop. tileasures sho�ild be taken by dte contractor to prevent surface water from collecting <br /> i <br /> in excavalions and trcnches. �Icasures should 6c implemcnted to rcmuve surface water Gom the <br /> , work arca. <br /> • Garthwork activitics should not takc place during penuds ol'modcratc to hcavy pmcipitation. <br /> • Slopcs with cxposcd soils should be covcrcd wi�h plastic shccting. <br /> � "ihc contractor should take uecessary n,casures to prevent on-site soils and soils to be used as fill <br /> from becoming wct or unstablc. Thesc me.�sures may include Ihe usc of plaslic sheeting, sumps <br /> witli pumps, and grading. 'fhc sitc soils shoidd not be lcR uncompactcd and cxposcd to nwisturc. <br /> Scaling thc surficial soils by rnlling with a smooth-drum rollcr prior �o periods of prccipitation <br /> wil; hclp reducc thc extcn[that dicsc soils bccomc wct or uns�ab(c. <br /> • Thc contractor should covcr all soil stockpilc:, that will !�c used as structural fill •.vith p lasiic <br /> shccting. <br /> • Canstniction traftic should bc restricted to spccilic arcas of thc sitc, prcCcraoly arc.,s �hat arc <br /> surf:�ced with thc cxisting asphalt or working pad matcrials not susccptib,c to wc[ wcathcr <br /> disturbancc. <br /> • Constniclion activitics shauld be scheduled so ihat thc Icngth of time that soiL;are Icft esposed to <br /> moisturc is rcduccd to the cxtcnt practical. <br /> Rotuing ol�equipmcnt on the nativu till subgrade soils during the�act weather months will be difficult and <br /> thc subgrade will likcly become highly disturbcd ard rutted. In addition,a significant antount of mud c�n <br /> I be produced by routing equipment directly un the glacial soils' in wet we:rthec Therefore, to protect the <br /> subgrade soils and tu providc :m adcquatc ��ct «cathcr ��'orking surf.2ce for the contractor's equipntent <br /> and labor, we recummcnd th;u tl�e conir:ictor pro�ect esposed iubgrade soils with sand and gravel, <br /> croshed gre�;cl,or!�f Ii. <br /> Permanent Cut and Fill Slopes <br />� �Vc rccommcnd that pcnn:�nent cut ur �ill slopcs bc constnictcd at inclinations of 211:1 V or fl:utcr, and bc <br /> blcnded into exis�ing slopcs tvi�h smoulh transitions'. To achicve unifurm compactian, we recommcnd <br /> that fill slopcs bc ovcrbuil[ slightly and subscqucndy cu[ back ta cxposc wcll-compac[cd lill. Ncw fill <br /> should bc kcyed into axisting slopes thnt are stecper th�n�11:1 V iit accordance wilh Scction 2-03.3(14) of <br /> the 2004 1VSDOT StanJard Spccifications. <br /> I o rcduce crosion,ncwly constnicted slopes sltould be pinnted or hydrosecded shortly aRer completion of <br /> grading. Until tBe vegctation is estnblished, some sloughing and r.tvellinc of the slapes should be <br /> cxpcctcd. 9 his inay uceessita�n lu�.�lized repuiis aud resecding. Temporary covcring, such as cican c�avy <br /> plastic shccling,jutc fabric, or crosion control bl:mkcts (s�ch as Amcricnn Escclsior Curlcx I or Nortli <br /> � ,Antcric;m Grecn S i�01 eould bc used ta prutcct the slopes during periods o�rninfall. <br /> 1 ir.A'.. Cuhe-dol r�,q �. ���_���"��/(C�'� G[QENGIKC[IIS� <br /> .Lu::�an''_.-r,ii� <br />