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�Vc rccommcnd th,rt \1PA bc on sitc lo obscr�c �hc appropriate liti Ihickncss ar.d <br />adcquacy of thc subgradc prcparation. A suflicicnt numbcr of in-placc dcnsity icst�. <br />should bc perti�rmcd as thc fill is bcing placcd �o dcicnninc if Ihc rcquired compaction is <br />bcing achicvcd. <br />Temporary Cuts <br />'I�cmnurarv Gxcavations anci Shorin� <br />"I�cmporary cxcavations should bc crmplctcd in accorJancc ���ilh Ihc curr��nt rcquircmcnts <br />of fcdcral, statc, and/or local agcncics and salcly rcgulations. I:xposin,: of pcisonncl <br />bcncath lcmporary cu1 slopcs should bc kcpl to a minimum. Conslruction should procccJ <br />as rapidlr as Icasihic, to limit thc timc Icinporary csca�-ations azc opcn. Durine ��ct <br />�ccathcr, runofl' �eatcr should bc prcvcntcd f�om cntcring cscavations, and shoidd bc <br />collcc�cd nnd disposcd of outsidc of thc canstruction limits. licavy construction <br />cquipmcnt. building matcrinls, and surcharec loads such :�s csca��atcJ soil sliould not bc <br />allo�vcd �� ilhin I/? uf thc slopc hcitht Irum Ihc top of:im c�cavation or i Icct. ��hichcvcr <br />is grcatcr. <br />Por tcmporaq cxca�atiuns cxcccc <br />accord:incc ��ilh provisions uf'fii <br />(�i'AC) Part N. "I:scavation. 'Prcn� <br />dcnsc glacial soils. silty sands ai+.d <br />inclincd no stccper than 0.75 li to I <br />ng d Icct in hcight. c�cavations must bc slupcd in <br />c 29G-Iji uf thc \Vnshington Aclministrati��c Codc <br />hing, and Shoring". or bc shorcd. �I�hc dcnsc �o vcry <br />sauds ut thc sitc classifj� as 'I'�'pc A soil and ma� bc <br />V, accordine to tlic \'VAC (Pigurc T�-Id). <br />Spccilic design lor temporar�� slopes is not includcd hcrcin. since thc contractor has <br />control o�•cr factors during constniction that arc critical to thc stability of ihc slopc. Sucli <br />faMors inciudc thc amotml of slopc opcncd at onc timc. thc Icngih uf timc thc slopc is Icti <br />upcn, anJ lo somc cstcnt thc timc of esposuro of a soil to ��cl �ccalhcr. 'fhus, <br />maintaining safc and slablc tcmporary cxcaeations is thc responsibility of thc conuactor. <br />\Vilh timc and thc prescncc of sccpagc and/or prccipitatiun. thc stability of Icmpor:u� <br />unsupportcd cut slopcs can bc signilicantly rcduccd. 'Ihcrclixc, tcmporary slopcs should <br />hc protccicd Irom crosion h�� inslall:uion of a surG�cc ��atcr divcrsion ditch or bcrm at thc <br />top of Ihc slopc and b� co��cring thc cut lacc �� ith ��'cll-anchorcd plastic shccts. In <br />:iddition. d�c contraclor shuuld monitor thc stability of thc Icmpur:u'� cul slopcs ❑nd <br />�idjusl thc constructiun schedidc and slopc inclination accurdingl)'. <br />Anticipatcd Sclticmcnls of thc Nc�� Pills <br />Givcn thc results of thc currcnl and previous subsurfacc csploration prugr.uns compl�lcd <br />at �hc sitc. �4PA Jocs nol anlicipulc ihal sctticment �vill bc an issur. <br />�ound:Uion Design Recommcndntions <br />13ascd on Ihc inti�nnation in thc dra�� ing un pagc d of ihc Valmunt Strucuu'cs rcporl uscd <br />fi,r thc 13NSP'I'-� 'I'u��cr in Sr.itUc. �vhich MPA undcrstands �� ill bc used for this sitc. thc <br />lo�ccr �bwulation is designed �i�r nn allo�eable soil bcaring capaciq� of 2750 psC 'I hc <br />ailo��ablc p�ssivc pressw'c is asswncJ to bc j5 pcf and thc basc sliding cocl7icicnl of <br />0.20. 'I�hc soil unit wcight is assumcd to bc I 10 pcf �vith no ground�vatcr crtcountcrcd. <br />Gcutcchn�cal and'I imncl Con<uhanls <br />I T.70lPuodmallcRednionJ RJ. tiie 7ui Phone la'-> 14N<.65[.I <br />N undim illc. Al'�A opu7'_ I'a�c i Fus li_'S1 J%B-^_M�U <br />