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I <br /> I NICAL ENGINEERING SERVICES <br /> GEOTECH <br /> COMMUNITY TRANSIT KASCH PARK k3ASE <br /> EVERETf,INASHINGTON <br /> FoR <br /> COMMUNITY TRAN5IT <br /> INTRODUCTION <br /> I <br /> 1'his rcporl prcxcnls thc resulis of our gcotechnical cngincering scrvices proviJed in support of the <br /> I proposed improvcmcros to the Community Transit Kasch Park facility located at 2300 Kasch Park Roed <br /> in Everett, Washing�nn. A vicinity map showing the location of the Kasch Park Operating I3ase is <br /> provided es Pigure 1. We provided a dra(1 report for revicw and comment on March 1 I, 2009, and have <br /> ( incomorated addilinnal recommendations for thc proposed new canopy swcture and soWhwest regrad�ng <br /> at your reyucst. <br /> We understnnd that the current projec� involves modi6cations to the new property located on the north <br /> I sidc of the Kesch Park Base facility(C'asino Road Property),end rcgrading within the southwest comer of <br /> thc cxisting facility. Sitc improvcmcnts will include adding two ncw wrb wts and drivcways to ecccss <br /> Ihc Casino Road property, modilications to the existing structure including e new mezzanine addition, <br /> I rcgrading ot the southwcst comer o;the existing facility to nccommodale bus parking, and conswction of <br /> a ncw canopy structurc. <br /> � 'I'he purpose ol'our geotechnical enginecrinF services is to complete subsurfece explorations at the site as <br /> a hnsis for evaluating gcotechnicnl rnnsideraiions for projcct dcvcloprcent. Our scope of services <br /> included revicw of existing geotcchnical data, coordination with sulxcnlractors, drilling threc <br /> hnllow-stem auger bonngti, cxcavaiing four test ,�its, completing laboratory testiug on the samples <br /> nbtaincd 1'rom thc horinqs, and prnviding gcotcchnical conclusions and recommcndations for dcsign and <br /> ccmtitruct ion. <br /> � GEOLOGY <br /> I'hc Puget Sound husin is a region nf Queternary (last 3 million years) sediments that renge in thickness <br /> bctwccn RIIO nnd 2,400 feet. Bednx k exposures erc prescnt on tl�e basin marqins to the cast and west in <br /> ihr Cascade and Olympic Mountains, respectively. 'I hc basin erca hes h�Yn repeatedly overridJen by <br /> Plcisuxcnr. (hetwccn I I,000 and 3 million ycan ago) contincntal glacial icc dcpositing till, glaciel sand <br /> I and �ravcl, nnd glncially fo�mcd lake clay and silt. 'Ihc rcpca�ed glacial ac' i� �as resulted in numerous <br /> nohh-sawh trending ridges, with intervening valleys filled wilh {wst-glur• �uvium and/or marine <br /> deposits 1(inlster, 1989). �fhe most rccent glaciel cycle of sedimem deposits is relen ,I to as the Vashon <br /> ' Drifl,occurrinE bclwccn I 3,500 and 15,000 years ago. <br /> �;culogic maps of Ihc projecl aren idcNify subsurface snils to consir• primarily of gi�cial lill of the <br /> Vashun Dri�. Lc�calized t+rcas uf orgenic sill and pw1 arc elsn mapped m thc w�lle�id area located south <br /> of thc operaling basc, nnd in thc vicinity of Hncing I.akc, locuted suuthwcst of thc Sl�f HCf055 Aitport <br /> Ri�ad. <br /> (ilarial till �ypicnlly consists of e he�crogencous mix�ure of sand, grevcl, cobblcs end occasional brulders <br /> in a silt and clay matrix that wTs dc�x�sited bencath a glacier. Because glacial till hxs becn overridden by <br /> ihousands ol' Iect of ice, it is typically Jense to very dense. Glacial till in the I:verett arca typically <br /> r d, .a,� luvt wv��i Pagr 1 GwEMa�Mee�s� <br /> �L:,�)1. Jix�v <br />