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tiubsurlhcc Gcolo�,ic Scttine <br />'I'hc prqjcclis localcd in Ihc ccnlral Pugct Sound arca. in thc Pugct Sound Lo�eland, an <br />clongated and slruclural depression bordered by Qic Cascadc Mountains on the east and <br />thc Ol��mpic Mountnins on ihc ��cst. During thc Quatcrnary Pcriod. gcological rccords <br />indicatc that glucicrs advanccd and relrcated in thc Pugct Lowland on at Icast livc <br />occasions, I�ach glacicr ��-as responsiblc lor dcpositing varicd assortments of till, out��ash <br />sand und gravcl and glacial lakc scdimcnts. l�hc most rcrcnt of thcsc glacicrs had a <br />ihickncss of approximatcl�� �000 Iccl Ihick in thc ScatUc arca. 'fhc surticial soils in this <br />arca are a result of glaciation during Ihis period. �vhich cnJcd approsimatcly 10.000 ycars <br />ago. and morc rcccnt alluvial deposits. In thc projcct arca. thc dcpth to bcdrock is <br />appro�imalcly 130010 IG00 �cct. ���ith glacial, inlcr-glacial and alluvial dcposits abovc it. <br />'1'hc czisting north-south trcnd of thc prescnt ridgcs, vailcys, and dccp inlcts of �hc Puget <br />Sound paralicls Ihc dircction of thc icc Ilo�v and shows thc results of glacial scouring. <br />'1'hc Snohomish Kivcr occupics onc of ihcsc glacially scourcd Iroughs. 'fhc trough had <br />bcen scourcd into glacially uvcrriddcn scdimcnt. 'I hc pmjcct si�c sits on a blull: <br />ovcrlooking lhc Snuhumish Ri� cr to thc nurth. <br />Subsur�acc Soil llnits <br />Soil conditions in tlic projcci <br />dcscribcd in thc Icst pit logs. <br />;vca �ccrc invcstiga�cd h� advancing tcst pit� at locatiuns as <br />In gcncr:il, thc sitc appr.vs �o bc undcrlain by 4 to j of undocumcnicd liil. ���hich in turn <br />is imd•.rlain by dcnsc nativc gla.:ial dcposits. "I'hc lill consists of mcdium dcnsc to dcnsc. <br />linc t�i coarsc Sand and Gravcl, with occ:�sional rubblc of asphalt and concrctc. 'I'hc <br />nativi inatcrial undcrl��ing thc lill is dcnsc tu dcnsc. silty linc to coarsc Sand and Gravcls. <br />�� ilh occat:ional cubblcs to R inchcs. <br />Ground�valcr <br />Ground��atcr w:is cncountcred at thc contact hcl�eccn thc �ill laycr and tlic nativc <br />matcrial. at dcpths of � tu SS fccL Pluctuations in thc Ic��cl of:hc groundwatcr �vill occur <br />duc to variutiuns in lhc tidc, rainihll. lemperatura scasons. ;md othcr lactors. <br />CONCLUSIOiVS AND RGCOM111GNDATIONS <br />Rascd on thc resulls uf thc �iclJ im�cslig:ition :md analyscs, it is our opinion that thcrc arc <br />no gcotcchnical constraint, that would prccludc pnijcct construction as planncd, provided <br />„ur rccommcnJations are incorpuratcd into thc design. Our dcsign rcconuncndations and <br />cunclusiims in Ihis scction ��crc dc��clupcd b:iscd on our undcrst:��,�r�,s ��ra,� nr�,����. ir <br />thc naturc or location o(thc proposcd construclion is changcd. NlPA should bc notificd so <br />�cc r.�n changc or contirm our rccommcndations. <br />It is otv undcrstmiding Ihat Ihc radio signal to�ecr ��ill havc a linmdation of pourcd <br />cancretc 10 Icct squ:���� :,�,d a i��� d��n. n,�� �5 a,� a,���,d;�tion rccommcndcd by Valmont <br />titructurcs. Givcn thc soil conditiuns at thc sitc. thc �i�undation will bc bascd in thc upper <br />�ill laycr. Thc cxisting sitc lill soils arc NO'I' suitablc r�r s��pn�n of thc proposcd <br />( rcuirchnical and "I imncl Comultants <br />17]A� NnoJimdlc�R.JmonJ I:J. tiic 703 I'honc H=S� J%nGSGI <br />VA'nn,lim illr. A1',V vSUT_ I'acc? I-uc N251 J%4-?M,U <br />