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(irnri•chnical f_l��ineering Rc•por7 3 Ocmher : i, ?DOS <br />(.'nnvnunih• Henllh C'enter, fl•crGl. 11'.4 Prnjecl N.'005-196 <br />3.4 Scismic Considcrations <br />Rascd on 2003 Intcrnational Building Codc (IDC), thc sitc soil is Class C from T'ablc <br />I G15.1.1. Thc carlhquake spectral response acccicration at shori periods (S,) is 130%g and <br />at I-second period (Si) is 47°/, g. <br />/,iqucfncrio�t <br />I.iqucfaction is a phcnomenon ��•hcre thcrc is a reduction or completc loss of soil strcngth <br />duc to an incrcasc in watcr pressurc induccd by ��ibrations from a seismic cvcnt. <br />I.iquefaction maiuh� ai7ccts gcologically recent deposits of fine-grained s�nds tliat are <br />hclo�+� thc groundwatcr tablc. Soils of this nawrc dcrivc thcir strength from intcrgranular <br />friction. "I'hc gcncratcJ ���ntcr pressurc or porc pressum csscnti�lly separatcs thc soil grains <br />and climincucs this intcrgranular I�riction, thus rcducing or climinating thc soil's strength. <br />�.1'c re�ic«�cd thc soil conditions encountcred during ficld c�ploratiun and assessed the <br />��uicntial for liyuclaction of thc sitc's soil during an carthquakc. Glacial till is gcncrally <br />considcrcd not suhject tu liyuclaction during an carthyuakc. 'fhcrcforc, Rilcy bclicvcs that <br />thc silc liquclaction potcntial durinE an carthquakc is minimal. <br />4,0 UltiClfSS10N AND RF:COM�1fNUAT10NS <br />4.1 Gcncra�l <br />13:iscd on our swd}'. the site is suitahlc (i�r the proposed construction from a gcotechnical <br />suindpoint. Foundations for Ihc prnposcd huilding cnn hc supported on con��cntional sprc.�d <br />li,oiings hcaring on mcdium densc to dcnse nati��c soil or stnicwral fill if ncedcd. Thc slab- <br />�,n-Fradc cau hc similarl� supportcd on lirm soil. <br />I)rlailcd recommc» dations rc��vding thc abo�•c issucs and uthcr gcotcchnical dcsigu <br />cunsidcrntions arc pro� idcJ in thc tbll�����ing scctinns. 7'hcsc rcconuncndations should hc <br />inrorporatcd into thc �inal �esi�n dra��'ings :md construc�ion srccificatirnis. <br />a.2 Sitc Prcn��ration and C;rndine <br />1�, �,rcparc thc sitc for consuuction. all vcEctation including bushcs and trccs within thc <br />}�crimctcr of the propnxd dcvclupmcnt area should be remo��ed. Surface stripping depths <br />��f up to 6 inchc:; should bc cspcct��d �o remo��e thc topsoil. !\Il thc deleterious materials <br />rclateJ to ��rccious construction ��iihin thc propuscd huildinp arca shoold hc rcmovcd. <br />l)ncr sh'inping. cicaring :md �uhcr rrcparin� operations arc complctc. cuts and fills can bc <br />madc to estublish dcsired huilding gradcs. Prinr to placing lill, ��r recommcud prooG <br />n,lling all cxposed surfacc to dctcmiinc if am• isolatcd sofl and �•icldmg areas arc present. <br />I'mu6rolling shouid he also rerfi�rmed in cut areas that �cill provide direct support for ne�� <br />. nnsn�uctinn. <br />1'hc Rilc� (iroup, Inc. <br />