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s� �.�,.�:���or! f,�r:��_so;�. i�vc. <br />Soil nail construction is performcd from thc ground surfacc down as cscavation procceds. <br />In gencral, thc first row of nails is installed not morc than 2 ro 4 fcct bclow thc ground surface, <br />and thc bottom row of nails is not installed hi�her than 4 fcet above the bottom of thc excavation. <br />Nails are installed in horizontal rows around the excavation perimeter after excavation procecds <br />2 to 3 fect bclow thc planncd nail cicvation. Lxcavation could procccd ahcad of nail installation <br />in thc central portion of thc proposcd building footprint away from soil nail walls. <br />10.8.3 Anticipaled 111o�•cmcnts <br />Soil nails develop capacity �ehen thc shoring ���all dcflects toward the excavation. <br />L'xcessi��e deilection could result in damage to structures and utilitics adjacent to the excavation. <br />Our experience has sho�vn that lateral deflections ���ith soil nail walls of Iesser height but in <br />similar soil as thosc anticipaled at thc Administration Garagc arc typically Icss than onc inch. <br />Similar vertical setllements are expected to occur ;�t the face of the wall. Vertical settlements <br />���ill dccrcasc �vith distancc from the wall cmd should bc neglioible bcyond a distancc of about the <br />wall height. Duc to the proposed exca��ation depth, the settlements and lateral deflections for the <br />Administration Garagc m:i�� hc somc��hat largcr than onc inch. <br />10.'I 7'emporar�� Cut Slopes <br />If tcmporary opcn cut slopcs arc uscd on sitc, thc "s;dc" tcmporary slopc for cxca��ations will <br />dcpcnd on thc Collowing factors: ( I) thc amount of ground�ratcr sccpagc, (2) thc soils cxposcd in <br />the escavation slope, (3) thc depth of the excavation, (�I) surchargc loads at the top of thc <br />czca��ation, (5) thc gcomctry of thc c�cavation, and (G) thc time o( construction. Construction <br />slopc � alucs rcquired for stability anJ safcty dcpcnd on a carcCul cvaluation of thc abovc factors. <br />[3cr.iusc of thc many ��ariables involvcd, rcquired slopc valucs can only bc cstimatcd prior to <br />cunstruction. Por safc �aorking conditions and prc��cntion of ground loss, cscavation slopcs <br />should bc thc responsibility of thc contractor bccausc hc/shc wiil bc ut thc joU sitc to obscrvc and <br />control thc work. All cunent and applicablc safety regulations regarding excavation slopcs and <br />shoring should bc follo�+�ed. <br />B�ca��ations can be accomplished ���ith conventional excavating equipment, such as a dozer, <br />front-end loader, or backhoc. Thc glacially ovemdden mateiial may bc di(ficult to excavate. <br />Por planning pwposes, ���e recommcnd that temporary, unsupportcd, open-cut slopes in the <br />��laciallp orcn'idden nati�e soil be no stee��er th:m 1 1[orizontal to l Vertical (lI-I:1V), although <br />lucaliu�i strcp�r slopcs m:�� hc �iossihlc in :irc:is uf s�ablc soil. �1'h�re cxisting till is <br />I-40�tb�J.�A15. B: ny.'IAJ <br />IG <br />Zl-L-09644-005 <br />