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f <br /> Octobcr 11.2011 <br /> �k. II�rvey JuUie <br /> I.&�^. �oh No. 1 I-06d <br /> Page 4 <br /> "i'he advance outwa�h soil unit underlying the V:uhun till is compused of stratilied sund and <br /> gravel with minor amounts o1'silt and clay, deposited by Uie meltwater of a�lvancing glacial ice. <br /> Uuc to thcir gcncrally granular composition, ilic ad��ancc outwash soil is of modcratcly lugh <br /> permeahilit}� and generalh• d:�aitu fairly' we1L 'i'lu ad��ance ounvash deposits aze glucially <br /> o��ccridden nnd i¢e gener�lly dense to very• dense in its natuml, undisturbcd stalc, except in d�e <br /> top 2 to �1 feet nlicrc cxposcd on slopcs «'lucli tnay be wefnhered to a loose to medium-dcnsc <br /> state. '1'he ad�,vice ouhvash deposits can stand in steep cuts or naniral slopes ('or extended period <br /> when undisturbed. \S�l�ere exposed on slopes ���idi poor vegetation co��er und subject to storm <br /> ruuoYTor ground«rter seepagc, thc advtuice out���ash depusits can be gradually croded and m�Y <br /> slougli and redeposit tu a llalter inclination. 'I'he undcrlying tiesh advance out��'ash deposits in <br /> thcir 111IIVC� undisturbed statc can provide guod �i�unda[iun suppon �vith littic sctticmcnt <br /> espected lor light to moSerdte residential structures. <br /> SOIL COVllI'P10NS <br /> \\�e ��'ere the gcotechnical engineer of record for u ne��• duplex building project constructed on <br /> the Rrterence 5ite in 2007, ��hich is �cilhin the samc cin� block un thc satne side of Grand <br /> A��enuc of the subject site. We provided gcotcclmi�ul ensineering and constn�ction inspection <br /> sen•ices, and verificd footuig bearing soils and c�aluatc cut ba�il: stubility ol'li�otprint c�ca��ation <br /> fur [lic lteference Project. "i�he huilding footprint ou d�e Relerence Site was excavared Ju��n to <br /> about 7 Ceet deep ir certicat cut ba��k:s. The soil condition� exposed on d�e cut banl:s ��'er� <br /> cumposed of lU to 12 iuehes of dark-brown. loosc. orga�uc topsoil, unJerluin hy 3 to 4 fcct of <br /> li�lit-bro��1�, dense, line to mcdium sand «•ith u tr�ce of gravel. 'I�his sand la��er«'as underlain b�• <br /> a dcposit of gra}', ���id, �inc sm�dy silt. A stccl �f-bar mm�ually pushed in�o fuoting bcaring soils <br /> nt hottom of c�c;��'�uiun could penetr:ue nu more tl�an an inch. The cut banks of the building <br /> L1U & ASSOCiATES, INC. <br /> ; � <br />