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' <br />' <br />' <br />� <br />' <br />' <br />�.� <br />� C <br />January 22, 2003 <br />11\VA Projccl Na 200?-135 <br />Lo�vcr Silt�� Sand fi1L• A ti� c-tiwt thick laycr of loosc to mcdium dciisc silry sand <br />���as cncoun:cred bcneath !hc clay; at ticpths nf 27 lo ?S �crl. l�his unit �casmoist to <br />wct. Partly decomposcd ���uud t�agu7cnls wcrc cncuumcrcd in DFI-I. su�_�,cstin7 that <br />this unit is a lill drposit. <br />Adrancc Out�vash: Nalivc suils consistim, i�f �'ciy ucnsc ��ra�'clly s�uid �ccrc <br />cncuuntercd at dcpths oF3? l0 3�± icct. '1'hc unit ��as drpusilyd by mclh�•atcr strcams <br />in front of thc advancing icc of lhc Pu�sc( Lobc of thc Curdillcran Icrshcct durin� thc <br />Plcisloccne. Thc unit lcnds to hc �vcll-surtrd, �cith �vr� liltlr sill, and is strati�ird. <br />"I'he dcposil was subscyucnlly ovcr-run by thc giacicr. �� hich rcachrJ hci��hts of <br />around 3.U00 lect, .U1lI lIlUS 1Y.15 OYl'f-l'UIISUIIlIBII'lI IU ;i crry drnsc cunJilion. 'I'hc <br />gravcl-rich upper po�tion uf lhc unil is Iypically mincd Inr a�s�-rrgatc. <br />Bascd on thc diticrcnccs atuongst thc cm•rent :mJ prrvious rspluratiuns, in soil <br />graclations and dcnsitics abovc lhc ��ciy dcntic Au�'ancc Ouh�;ish, si��nilicanl cari,ihility <br />should be anticipated bchvecn exploration lucatiuns. <br />GROUND �VATER <br />Minor perched ground water was encountered within thc luose to mcdium dcnsc sanJ fill <br />above llic vcry dense Advauce Ouhvash. Silty sand till abovo llic sotl clay ���as moisl lo <br />wet, which may indicate minor perched ground walcr at thr fill / clay cuntact. I lowcver, <br />no ground wa(cr �vas obscrved in thc picrumctcr in I3FI-Z, 10 Jays aRcr installation. <br />� The ground water conditions repo��ed on the burchulc lo�s are fi�r lhe specitic date uiid <br />location� indicated and, thcrcliirc, may nol ncccssarily bc indicalivc of othcr timcs and/or <br />1 locations. Purthennorc, it is anlicipalcd lhal ��round walrr condilions �vill vury in <br />response to rainfall, time of year, luc:il subsurface cunditions, and other ILctors. <br />� <br />� <br />CONCLUSIONS ANU RGCO�I�ICNUATIONS <br />The subsurface conditions encowitered in our borings were somewhat similar tu those <br />reported in borings advanceJ f'or ECI's 1993 gcotcchnical investigation. Flowcver, a <br />direr.t cicvation comparison is dif(icult, as thcrc is a GO-Coot ur so Jiscrcpancy in <br />cicvations, which scems to be a diffcrcncc in survcy dalum utilizcd. Nohvithstanding, we <br />encountered the very dense Advance Outwash sand at similar dcplhs (behvecn 30 anJ 35 <br />feet) as in the previous borings. <br />f3ascd upon thc subsurfacc conditions cncountcrcd in our c�plorations, thc luosc fill and <br />very so(i clay Ucneath thc upper dcnsc till should bc espcctcd to scttic signilicantly <br />bcncath strucwral loads, as ���cll as liom cvcn modcst Iluor luading. Thc cu:rcnt statc of <br />rnnsolidation of the clay duc �o thc ��cight of thc o�crlying lill cannnt hc dctcrmincd <br />'_011'-IS$ tiiq,pl I.It.dnc <br />I I1�':\ l�cuScicnces Inc. <br />� <br />