Laserfiche WebLink
' <br />� <br />I� <br />I� <br />I' <br />I' � <br />I' <br />' <br />' <br />� <br />' <br />� <br />1 <br />:: <br />lanm�rv 2_'. 20U3 ` <br />II\VA Projcc� Nu. 2002-135 <br />spread fiiotings. Ho�ve��cr. thc minimum rccommcndrd limtim� sizc is 13 and ?-l-inchcs <br />fiir strip and syuare lootines, respccti� cly. All 1i�otim�s shoulil hr Ii�unJcd at Irast <br />13-inches below tinal grada ' <br />SetUcmcnt uf soils, duc lo thc causcs JcscribcJ prc� iousl�; shuuld hc anticipatcd brnuith <br />the nx�dular office building. Pcriodic shinuning af the modul,ir cicm�nts ::ill likdv bc <br />rcyuired to oflset the effects of difl'crcnlial scltl�mcnt. <br />SEISAIIC CONSIUERA7'IONS <br />The project site lics within Scismic Zone 3, as dclincd in thc Unili�rm 13uildin�.: Ci�de (UBC, <br />1997). Zone 3 includcs all of �vcstcrn Washington, and rrprc�cnls an arca of modcratc <br />>eismic risk. Consequcndy, moda�ate tu high Icvcls of r,irthyuake shaking shuuld bc <br />anticipated during thc dcsign lifc of lhc proposcd impro� cmcniti, and thc facilities should bc <br />designed to resist earthyuake loading in accorJance �� ith :q�plicublc local anJ stale <br />requiremenls. , �. � , <br />Based on the subsurface conditions obse��ed during our cxploralion program, U13C Suil <br />Type S� may bc assumed for the sitc. '1'he corresponding nomialized respunse spectra tix <br />the assumed UBC Soil Type is considered appropriate lor tlic sita <br />Seismic hazards including liyucfaction, latcral snrcadin�, and groifid surface nipture <br />were evaluated for the site, with the latter h��o effects considered to bc low. Soil <br />liquefaction is a phcnomenon whercin saluralcd, cohcsionlcss soil deposits tcmpurarily <br />lose strength and behave as a liyuid in responsc to carthyuake shaking. Suil liqucfaction <br />is generally limited lo loose ganular scils localed bclow the �vater table. Althougli loose, <br />wet, granular soils were encountcred in borchole I311-I thut could bc liyuiliablc, their <br />present depth (28 f'eet) and silt contcnt (40"/0) reduce the ch.mce of'liyuefaction. If <br />liyuefaction conditions occur, undcr tlic dcsign Icvel rirthyuakc whicli may bc expecled <br />for this area, it is not anticipateJ that it would manifest itself on sur�ace, other than <br />setUcntcnt, due to the presence ot�a subst.mtial crust of n��n-liyucliable malciial. <br />UNn�:kc.aouNu U�rn.rrir:s <br />'i'hc ncar-suii�acc silly sand should pro��idc suitablc sub�radc sup��ort cunditiuns liir <br />underground utilities, and open trenches shaidd stancl ���ith ncar � cnical walls I'or depths <br />nornially associalccl with such installalions. I lo���cvcr, ti,r dcplhs in cxccss of4 fccl, lhc <br />trcnch sidcwalls will have to bc slopcd, or shurcd, in compliancc with rcgulutory <br />legislation for workcr safely. \Ue rccommcnd a masimum slopc of 1 SN:I V for the silry <br />sand till dcposil ou sitc. <br />Sewcr ancl �valcr pipcs should bc placcd in accord�mcc with Ihc pipc manulaclurcrs <br />rccommcndations for bcdding and backlill. Ho���cccr, wc rcconuncnd a tninimum of 6- <br />inches of bcJding nuitcrial bc placcd undcr pipcs on a trcnch sub��radc. �chich is I�rcc of <br />2U11_'-IRS Suppl LIZ.Ji�c <br />I I11'A (icoti�icntes Inc <br />