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Oc�%tJ2;1�9e. u3:J,' :OE3J7047? �FWaAI C POTEr� PA� �» <br /> � i c : � ��� <br /> I Tt+om�s�ones p�� <br /> � M�►cl1 t4, 1OOe <br /> The values pivon abov� are to be used to deslqn p�rmanent toundatlon end retaininp w�ll� only. <br /> Th� passive pnssure plven i: approprtate tor the depth ot tavel, stnictural fill placatl in tront of � <br /> retaininp or foundation wa11 only. W� ncommend a safery taaor of at leasl 1.5 for overtuminp <br /> and sltdinp, when usinp th� above recommended valuea to deslfln lhe wetls. <br /> � � <br /> The desipn valu�s piven above do not inctude ths aHacts oi any hydrostatic pressuroa b�hind th� <br /> i <br /> walls and essume thet no surCherpe alopes or load�, �uct1 ea vohlctas, will be pl�ad behind ths <br /> w�lls. II th�se conditions oxist, thoss pruans s�ould b� �dCed to the abov� Ist�ral soll <br /> prsssuns. Also, if stopinp b�ekfitl ia Aeslrod b�hintl t�e w�lls, we will ne�d to be piven th� watl i <br /> dimenaions and the stop� of the backtltl in order to provfde tho appropriste Cesipn ��rth <br /> ' pnnuns. <br /> � <br /> I <br /> Heavy construction equipment should not be operated b�hlnd ntafninq �nd toundatlon wails <br /> wlthin a distanca equal to the heipht of o wall, unless the walis are de�ipn�tl for the edditiornl <br /> latoral prassuns resultinp from ths eguipment. Tha compaction ot baekRll near ths w�lls thoultl <br /> be accomplished with hand-operated equipment to prevent ths walls from beinp ovanoaded by the <br /> hiphor soil forces lhat occur durinp compedion. <br /> � Retaininp Wall B�ckflll <br /> I Backtill placed behind ntainin9 or four,dation w�lls shoutd be coena, frae•dralnlnp, <br /> structural fill contalninp no orqenic�. This backfl�i should contain no more th�n S p�rcent <br /> ailt or clay paAicles and hava no pravet praaNr thAn 4 inchea in dlemeter. Th� p�rantaps <br /> of particlea p�s�inp the No. 4 sleve ehould be between 25 and 70 pereent. Due to thelr iIR <br /> contents and fin� prain slze, the naUva soil and on-sit• fi,l aro not suitabl� aa retalninp w�ll <br /> beckfill. For increesed protectlon, drafnap• compositee could be plaud along eut �lope <br /> lacee, and the walis should be bac�cfiilad wlth pervious soit. <br /> I Ths purpos9 of those backflll reQuinm�nts Is to eneun Nel the dasipn c�iterla for a <br /> retaininp wall are nol exceeded because oi a Duitd•up of hydrostatic prossure behind th� <br /> wall. The top 12 to 18 inchea ot lhe backfill shouid consist of e reletively imperms�bl� �oil <br /> or topsoil, or the surtace should bs paved. Th� sub-secNon entilled Gener�l E�rthwork <br /> �nd Structur I tIi contains recommendations reqarding tha p�acement end comp�ctlon of <br /> slrvctural fili bahind rataininp and found�tion walla. Th� above recomm�ndaUon� �n not <br /> intended to wat¢rprooi Ihe below•prad• walls. If moiat conditions or som� ���p�ps <br /> throuflh tha wails are nol accoplable, demp-prooflnp or waterprooMp ahould b� provided. <br /> Thi� could include limitinp cotd•Joints and well perotratlons, and possibly usinp bentonke <br /> panels ur membranea on the outslde ol the walls. Applyinp a lnin coat ot aaphslt �muleion <br /> is not cons�dered watarprooflnp, but it wiu help to pravent moisture, peneratad from wabr <br /> vapor or capillary action, irom se0pfnp throuph the concnt�. <br /> I <br /> � Exc�vatluns �nd Sloce� <br /> I Excavatior• slopes should not exceed the limits specified in locai, state, end nalional govemment <br /> safety repulat�ans. 7emporary cuts to a deptn of about 4 leet msy be anempted vertically in <br /> unsaturated soil, if there ara no indications of slope Instabflily 9ased upon Wash(npton <br /> AdministraU�e Code (WAC) 296, Part N, the soil rype at Ne subjeet sita would be classifled a� <br /> IOEOTECN CONlI1LTANfY.INC. <br />� I ---- <br />