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�J <br />� <br />� <br />�i,'.,�':'�L: : `��";'i��Ot�.I;vC. <br />scismic loadin� conditions. Thc allowablc bcaring capacity is bascd on thc assumption that thc <br />subgradc preparation rccommcndations, �vhich arc discusscd in this rcport arc followed. \Vc <br />rccommcnd a minimum footing embcdmcnt of 24 inchcs bclou- thc lowcst adjaccnt gradc. Wc <br />also rccommcnd a minimum width of IS inchcs for continuous footi�gs and 2d inches for <br />column footings. <br />� Assuming compliance ���ith the recommendations in o.�r geotechnical rcport, ��•c anticipate that <br />static loading settlemcnts would bc 1 to 2 inches, with diffcrcntial settlemcnts bctween adjacent <br />� footings or ovcr a 20-foot span of continuous footing equal to about ha(f the rotal setUement. <br />OurJunc 3002 tcchnical memorandum included an original rccommendation of 12 ksf allowable <br />i bcaring capacity that coRespondcd to static loading sctticmcnts of about �/: to �/a inch. At thc <br />' rcqucst of Skilling Ward Magnusson Barkshirc, wc arc providing a highcr allowablc bcaiing <br />capacity ( lG ks�, which corresponds to higher anticipatcd static loading sctUcmcnts. <br />Thc nc�v pcdcstrian tunncl exr.wation may cncountcr fill from prcvious construction of thc <br />esisting Wnncl, Administration Building, or othcr facilitics, or from thc proposcd scwcr linc <br />installation or other utilitics benealh Oakes Avenuc. If thc hase of thc new Wnnel cxca��ation <br />cncountcrs fill, �vc rccommcnd an allowablc bcaring capaciry of about 3 ksL To achic��c thc 3 <br />ksf bcaring capaciry, wc recommend that thc upper 2d inches of cxposcd fill be denscly <br />comp:icicd to 95 ��crcent of it, �7odificd Proctor maxinttim dry dcnsity .md to a dcnsc, unyiclding <br />condition. <br />lf Ihc prup<�scd �Adminishation 13uildint� finish flourcic��ation rcmains at 14S fcct, thc building <br />will likcly rcquire support from :� combination of foundation typcs. Thc southwcst portion of the <br />building may require dccp foundations, such as drilled shafts or augcrcast pilcs bascd on thc <br />presence of deep, very loose fill encountercd in Uorino B-1 l. Based on borings B-7, B-8, B-12, <br />and B-12A, the rcmainder of thc building would likcly be foimded on relatively shallo�v spread <br />footings. Additional foundation rccommcndations for thc Achninistration I3uilding �vill bc <br />providcd oncc morc dcsign infonnation has becn cstablishcd. <br />10.5 Lateral Is'arth I'ressures for Permunenl 1Valls <br />Lateral carth pressures may act on buricd portions of the building walls. For buricd building <br />�valls that are :illo«�cd to move at Ieast 0.001 times the ���all hcight, we recommcnd that a static, <br />;�rti�r, latcral r:irth �,rcssurc hc uscd. Por huricd huildim� ��:ills that arc not allo��cd to movc <br />_ i-i-�����,a, ir,..e i,,,i, ��,i � 1- I-096-1-1-OOi <br />II <br />