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March 30,2009 <br /> f IWA Project No. 2009 J30-21 <br /> When the first f il is placed in a given arca, nnd anytime the type of fill matcri¢l changes, <br /> thc ai�c?�I�ould be considercd a tes�section. The test scction should Ue used to establish <br /> i�il placement and compaction procedures requircd to uchieve proper compaction. The <br /> gwtcchnicnl consultent should obscrvc placement and compaction of thc test section to <br /> Assist in esinblishing an appropriate compnction procedure. Once a placement and <br /> compaction procedure is established,thc contrpctor's procedure should be monitored nnd <br /> periodic densiry tests should be performed to verify ihat proper compaction is being <br /> q uchieved. , ',.�'�, <br /> 3,61 Temporary F.xcnvetinn � <br /> r; '., <br /> Based on our understanding of thc projcct,tcmporary excnvntion,will bc required to <br /> facilitntc inslallation of various utilities as well ns potcntiul Storm wa�er catch b�.sins. <br /> fnstallation of thcsc slructures may require cxcavations in excess of fow�(4)�fcct. <br /> � <br /> in accordance with Paii N of WAC(Washington Adminislrative Code)29�-155, <br /> tcmpornry shoring will bc requircd wherever the excavation is decper thau 4 feet. Per <br /> thcse requirements,the cxisting alluvial'soils arc clessificd as Type C soils. Temporury <br /> unsupportcd excavations within these soils may bc sloped no steeper than 1'/zH:1V <br /> ((�orizai(ul: vertical). `� <br /> ,\ <br /> `.` <br /> For snfc working conditions and prevenlioii'of ground loss,cxcavution slopes should bc <br /> thc responsibility of thc Contrnclor since thcit�personncl will be nt the joU sitc to obscrve <br /> and control the work. All current und upplicable safety regulntions regnrding excavntion <br /> slopcs nud shoring should Uc ('ollowed. <br /> 3.G.3 ;Wet Wcnther�F.arthwork <br /> [f oni1liwork,�s to be perf�rriied or fill is to be placcd in wet wcalher or under wet <br /> coiiditions wlicn soil maisturc contcnt is difficult to control,the foltowing <br /> rccommcndniiqiis should b'c incorporated into the contrnct spccifications. <br /> \..'` <br /> • P.arth���ork'sttould be accomplished in smull sections to minimize exposuro to <br /> wet wcather; �xcavution or tlic rcmoval of i nsuilable soil should bc <br /> followed promptly Uy the pincement und enmpnction of u suitable thickness <br /> of clem�slructural fill. The sizc nnd typc of construclion equipment uscJ may <br /> liavc to be limited to prcvcnt soil disturbance; <br /> • Material used us stntclural 511 should consist of cican,gr�nular soil, <br /> contaiuing Icss tlian 5 percent by dry wciglrt pussing the U.S. Stnndazd No. <br /> 200 sicve,based on wet sicving the fraction passing the'/.-inch sicve. 'fhe <br /> 2009•OJ0:1 Dmllma �� HWAGEoSCIENCESINc <br /> 15 <br />