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Mnrch 30,2009 <br /> ' ' IIWAProjcctNo.2009-030-21 <br /> Advance Ouhva�h: -Glacially consolidated advance outwash was reported in the <br /> previous explorations beneath Uie native clay deposits,cxtending to the full depth <br /> of all cxisting explurations. '1'l�e advance outwnsli is generally dense to very dense <br /> sand with varying silt and gravel conlent. Advance outwash exhibits high shcar <br /> strength und low compressibility. <br /> 2.4 GROUNDWAI'ERCONDPCIONS <br /> � Gxisting gcotechnical infonnation indicAtcs thc ground watcr levcl to bc about lO to 11 <br /> fect bclow cxisting ground surface. The configuration of the subsurface soils(fill ovcr <br /> clay) is conducive to the presencc of u perched graundwuter tnble. `f'crchcd ground water <br /> wus not rcportcd in thc prcvious cxploralions advnnced to date. However,there is a <br /> possibility of perched wnter over the cl�y and within the fill bcing encountercd during <br /> COIISINCtIOIL . . <br /> 3. CONCLUSIONS AND RCCOMMENllATIONS <br /> 3.1 CerveKn� <br /> Based on cxisting gwtechnical infonnation iu llic vicinity,the IIRT site is anticipated ro <br /> bc widerlain by a sequence of nndocumented fill,compressiblc clny,and vcry dcnsc <br /> advunce ouhvush sand.: <br /> Due to its hetcrogcncity und re�ortcd abundimcc of wood and othcr dcleterious mnterials, <br /> the uudocumcntcd fill blankctiug thc site is considered wisuitable for foundation support. <br /> 'l'hc underlying norni111y consolidated ciaywill consolidate whcn loadcd with ncw fill or <br /> foundations. Sltallow fuwidations will,,thereforc,necd to be designed for low allowable <br /> bcuriug capacities tliat are settlement-controlled. <br /> Puvement for the bus(erminal should consist of PorUand Cement Concrctc(PCC)nnd <br /> Cnished Stone Busc Coursc(CS13C)to support thc nnticipnted bus truffic. Over- <br /> cxcuvatiou of the widocumented fill mnterial m�y bc necessary to providc adcquatc <br /> subgrade support for thc pnvcmcnt scclion. <br /> In the followiug scctiuns of lhis report,wc prescnt detuiled recommendations for seismic <br /> dcsign critcrin, foundation design,pnvemeut design,contaminated or hazardous soil <br /> hnuding provision, sitc cnrtlitvork,tcmporary cxcnvations,t�nd sitc diuinnge and crosion <br /> control. <br /> �oo�-u�o-n o„n�_.„ 3 iiwn cr:osc�:ncFs inc <br /> 7 <br />