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March 30,2009 <br /> • IiWA Project No, 2009-030-21 <br /> • Both joint faces of er:ch joint shall be snndblasted prior to high-pressurc wnter- <br /> binsting followcd by higli-pressure air-blasting,in order to provide clean bouding <br /> surfeces tliat are dry and frce of contnminants. <br /> • A %:•incli diamcter backer rod shall bc properly inseried into tlie joint a�id placed <br /> alm�g the bottom of the secondary sawcut. <br /> • "1'he scalanl shnll be placed to u thickttess of'/rinch. Sealant thickncss should nol <br /> � exceed 3/8-inch. <br /> • 7'he top oC lhe seulunt should be recessed 3/8-inch bclow the top of conci�ete. <br /> Senling should be�xrfonned"bottom-up"und proper equipment with properly <br /> sizcd noizlcs should bc uscd to place the sealnnf'such that in no locations dces thc <br /> scal;uit breach thc surfacc of lhe pnvement�'� <br /> > <br /> � <�A <br /> 3.5 SOIi.CONTAMINA7'ION ' <br /> 3.5.1 C,eneral <br /> HWA nssisted Grunitc Northwcst Construction(Granite)willi;charneterizatiai und <br /> disposal of pctrolcum-uffected soils excavntcd during the cons'tiitction of pnrking <br /> Fecilitics aiid iustnllatio�i of utilitics far the Gverett'I'ransit Station. Tliese evaluations are <br /> documenteci in dctuil in lhe 1'ollowing teclmicul mcmorandums; <br /> • "Technical A�emorund�ir�l,;Arrnlylica/ResiJts, Stockpiled Soil Snmpling, Sotnrd <br /> Ti�nrtrif Comniuter S(nfio�i,'Lvere(i, (Vu.shington", I IWA GeoScicnccs Inc.,datcd <br /> July 15°i,200R. <br /> • "Teclinicnl A4eniorrnrrhi�it;Annl��lica!Rusul�s, Stocicprled Soil Snrnpling, iYest <br /> Cons(rt�ctio�t Ar•ea, So�atd'IYansit Camrnufer Stafion, Evere�f, 1�asl�iitglon", <br /> HWA GeoScicncos Ina, dalcd July 15'�',2008. <br /> • "Tecivaicnl Mentw'andinn, Annlytical Resulls,Stockpiled Soil Sampling,Sound <br /> 'I'ixmsit Commutcr Startion,Evcrott,Wnshington", [IWA GcoSciences inc.,dated <br /> July 30°i 2008. <br /> I I\4A collected chattictcrization samples irom srockpilcd soils at thc site. Per I1R�A's <br /> uiemos dated.luly 15,2005,samples collcctcd from Uie `West' construction urca <br /> conteincd lotnl petroleum hydrocarbons(1PII)and polynucleur aromatic hydrocarbons <br /> (PAHs) in esccedmicc of Wnshinglon Depnrtmcnt uf ticology cleanup levels. This urca is <br /> adjacent to dic current project aren. Copies of the above stnted sumpling memos prepnred <br /> for Granite nre included�u Appcndi�B. <br /> 13ased mi lhe findings o£this study,sane soilc excavatcd for sitc improvements are likely <br /> to contain elcvutcd corcentralions of'CPH and PAF►s. Consl�vction bid ducwuents (plans <br /> Z009•O70•21 nmit rne 9 H WA Ge05��Ncr's INe <br /> IJ <br />