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EXECUTIVE SUMMARY <br /> This report contains thc resul;s af our geotechnical enginecring scrvices f'or use in the design of thc <br /> proposed Campbell Suup facility at the �eaway Business Center in L'verett, 1Vashington. The projeci <br /> consists ofconstructing a new 215,�00-square-fout concretc tilt-up building. <br /> SUB:;URFACE CONDITIONS <br /> f3ased on our expericnee at Qie site, the near-surfuce soils generally cunsist of glacial till overlying <br /> advance ounvash or structural fill ovcrlying these glaciai soils. Glacial till wnsists of densc lo vcry dense <br /> silty sand with gravcL Advancc outwash lypically cnnsists oFdcnsc sand and gravcl with somc silt. [3oth <br /> thc till and adcancc outwosh are compctcnt load-bcaring soils. Ciroundwatcr was encountcrcd in <br /> monitoring wclis at thc s�;c :i. dcp�hs ot nbout 2S :md GS fect in thc +outh���cst and southcast arcas of thc <br /> sitc, respcctivclp. <br /> SEISMIC DESIGN <br /> In uccomancc �vith �hc"_'UO3 Intcmatiunal 13uilding Codc (113C). thc ;itu is classificd as Sitc Class D. <br /> REUSE OF ON-SITE MATERIALS <br /> Thc nativc glacial till is expcctcd io bc suiriblc fi>r �isc :is structur.�l fill during thc swnmcr months and <br /> may bc suitublc as fill in thc wct «cathcr months in arcas nccJing only 90 percent compactiun of Ihc <br /> maximum dry densiry (MDD) per Amcrican Soaory for Tcs-ting and Ma[crials (ASTM) D 1557 hy <br /> utilizing good construc�ion practices. Ne do nur rceummcnd using the native gl�cial till cluring wet <br /> wcatlter whcn 95 perccnt cumpaction is reyuireJ. <br /> FOUNDATION DESIGN <br /> 1'hc building can bc suppurtcd un �onventiunal shnllu�ti� Cootin"s bcarinq un tmdisturbcd dcnsc to vcry <br /> dens'e glacial soils ur on strucwral �ill placcd o��ec these soils. 1Ve recommend footings be designed us'ing <br /> � an allowablc soil bcaring valuc of 3,OU0 pounds r.c squarc Caot (psl). Thc allowablc bcaring valuc may <br /> be incrc�sed by one-ihird lor short duration loa:is such as wind or seismic events-. <br /> f <br /> Latcral li>undation loads may bc resi,tcd by passive resistancc on thc sidcs of thc (ootings ancl by friction <br /> on [hc basc of thc lootings. Por lootings supported and sunowidcd by cidtcr dcnsc nativc soils ur <br /> comp:�ctctl siruc:ur:d lill, a cocff cient ol'friction of 0.3� and a passivc resistancc of 3�0 poimds per cubic <br /> foot(pcf)ntay bc uscd ior latcral resistancu. <br /> Pouting drains shuuld bc inrurpor:ucd in thc dcsign of the buildin�. <br /> FLOOR SLABS <br /> I :A subgradc mo�lul::s uf i�0 pounJs per cuhic inch (pci) ma}� bc iucd for dcsign of the slabs-rni-grxdc at <br /> ', thc sitc. Concretc slabs-on-��.r:iJc .hould hc ,up�,ortcd on a (�-inch-thick capillary brcak I:�ycr uvcdain by <br /> a vapor retardcr. <br /> I BELOW-GRADE WALLS <br /> 13elow-grade walls should bc h�ckfJled �cith a dr;�inagt laver :u recommended in this report. Por <br /> bclow-gradc walis rclaining �Icnsc nativc soils soils, or backlillcd �vith compactcd structural �ill, wc <br /> recommend Ihc following lalcinl pres,ures lix design: <br /> I <br /> • alluwablcpassi�c-3SOpcf <br /> • active—35 pcl' <br /> • a[[cs[—55 pci: <br /> File�iu. l?Ols-�iU1.iiC ��'�� ������ �'ugellS-1 GEOENGIN[tRS� <br /> hmimrv oc 'o0s <br />