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.',• <br /> � � <br /> r . <br /> E-3592-610 <br /> Omniplan PaQ3 8 <br /> �. '�' July-9, 1998 <br /> Ground Motlon RosPonse <br /> The UBC Earthquake regulations contain a static force procedure and a dynamic force <br /> procedure for design base shear calculations. 6ased on tho encountered soil conditions, <br /> it is aur opinion that site coefficient of S, = 1.2 should be used for the static force <br /> procedure as out�lned in Section 1628 of the 1994 UBC. For the dynamic force procedure <br /> sholuld be u ed'for F g u e 3t Norma4zed Response Sp�ctRa ShdpeStlff Clay (Soil Type 1� <br /> , Exc�va I lOnes <br /> �' ' "- �, The foltowing Information is provided solcly as a service to our cliant. Under no <br /> ' " ��'��. • circumstances should this information be interpreted to mean that ECI is assuming <br /> ��> . • ;; ': responsibility for constructlon site safaty or the contractor's activities; such responsiuility <br /> i ' is not being Implied and should not be inforred. <br /> 1 <br /> In no case should excavation slopvs be greater than the limits specit(ed �nrades�would be <br /> ' Federal sefety regulation�s'S�he7empo�rarytcu segreateethanrfour feP 9 height in Type <br /> classified as Type C by <br /> flatt rs caronot be const ucted,�te npor�ary shoring may bef necessa y this inclinarion, or <br /> All cut slopes sfiould be observed by ECI during excavation to verify that conditians are <br /> mprovle stability,includingtfiattening ofes op snor Insta}Ilation of surfaoe or ubsuface <br /> drains. In any case, water should not be allowed to fiow uncontrolled over the top of any <br /> slopes. <br /> All permanentlyexposed slopas should be seeded with an approp�iate species of <br /> veeetatlon to reJuce oroslon and imp�ovo stability of tho surficiai layer of soil. <br /> Eenn Con�ultenb. Inc. . <br />