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. , '� <br /> � �.\•.: .<i �" <br /> \ ` �. ):;\• <br /> _,;:a:.- \ <br /> --. . __---1 . __ .. -- <br /> f ii! ` nIA ()( ) / ) I ( c _._. <br /> • � ^ T ���Ll. ' 1� I l. ,� ��„7 � � l `��.r ��l17)\��\L�I� \.��\ J I�.J � rt n e <br /> _... . . . . . . _ __ .. . . <br /> \ <br /> GO�I:��nn�:cncweerts ' execui�veornc[5 � �� CUNSUL�I�lr,Gf.OLOr:15T5 <br /> CE M1IE Sf. EC P.O.DO%C t7125 �/�y � / GFOLQG�[n�SUNYLvS <br /> ST(iUC7U�in�i�i;l'ivur.fr:pilnTir.ri SOiL 7E5T Oauinr,5 • <br /> NOT -ISOipP[ %.I!(1YUl_i1t/C�O�IIr � T1]p�17T���VCf7Uf.K'EST 591LtdCf.FInNICS <br /> STRENGTH OF tilMERIALS L/�R � S[AI�LE,PfA.7f1119 qPPUED EAt:TH SCIENCES <br /> PHONE QWI2(t!-OCGS , <br /> i �uly 31 , 197f1 <br /> � Certificate (lo. 7805-301 <br /> , <br /> � __ _. - <br /> : , �..�-. q/�/�� <br /> Seattle First National Bank <br /> � ' 821 Second Avenue <br /> , Seattle, WA 9II104 � � � � � �� � � <br /> u <br /> Attention: Fir. Harry Stitle, P. E. LJIJ �- <br /> � hianager, Constructidn Section SEP O1 1978 <br /> • Subject: Sea-First National Bank CITY OF EVERETT <br /> � Everett h.all Dranch In5 eCt10� De <br /> Everett, Washin9ton � Pt• <br /> Gentlemen: ' <br /> � <br /> , <br /> Our rzport of June 19, 1978 indicated that the site should be proof <br /> rolled. Proof rolling serves a t�ao-fold objective. first; to compact <br /> the soil and second, to disclose local areas that may prnduce differ- <br /> ' ential settlement subsequent to construction of the building. <br /> r <br /> e <br /> The degree of conipaction or density of tf;e soil is a measurable property. <br /> Insta6ility or pumping occurs �•ihen the compactive e`fort is capable of <br /> r•educing thE porosity of the soil but is prevented from doin9 so by the <br /> � moisture content and the permeability of the soil . The resultant lateral <br /> a <br /> ' and sometimes veriical dispiacemenC of the soil around the perimeter o` <br /> > the compaction equipment is visibly apparent. <br /> � <br /> • .. . . <br /> Corrective action to be taken when and if this unstable situation de- <br /> � <br /> � �oelops, is to replace the lo�ver permeability soils that restrict the <br /> escape of surplus pore �aater, with clean, granular soiis of high perme- <br /> Mability. In other words, the clean, granular material should have very <br /> little if any material passin9 the No. 40 sieve. There should be continu- <br /> ' � it� of this clean soil such that water rir ng to or near to the surface, <br /> r ' <br /> ' can disperse laterally rather than being conrined in a local area. <br /> i • • <br /> ,� _ <br /> � <br />