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IMPORTANT INFORMATION <br />ABOUT YOUR <br />GEOTECHNICAL ENGINEERING REPORT <br />More construction ,ire caused hy site subsur­ <br />face conditions th.in any other lactor As troublesome as <br />subsurface problems c.m U* their lrc\^uency and extent <br />have been lessened considerably in rcxeril years, due in <br />large measure to programs and (Hjblications of ASFt/ <br />The Association of Engineering Firms Praeticing in <br />the Geosciences <br />The following suggestions and < bservations are offered <br />to help you reduce the gt'oiechnical-related defays <br />cost-overruns and other costly headaches that can <br />occur during a construction pro;ect <br />A GEOTECHNICAL ENGINEERING <br />REPORT IS BASED ON A UNIOUE SET <br />OF PROIECT-SPECIFIC FACTORS <br />A gcxMechnical engin»vnng report is t.ascnl on a subsur­ <br />face exploration filan designed to itu.orfxnate a unique <br />set of proteci-sjHxifi* f.v:tors Thc’st' typically incluile <br />the general nature of the struc ture involved its si/c ancf <br />configuration the locatior of the strui-ture on the site <br />and its orientiition [>hvsicai corn omitvints sue h as <br />j;ccss nvjds parking lots and uri(ferground utilities, <br />and the level of additional risk ’vhich the client assumed <br />by virtue of limitations im|XTseci upon the exploratory <br />program To help avc»id costly t>roolenis consult the <br />geotechnical enginexT t(T determine how any fat t<vs <br />which change subsequent to the date of the rc‘|KUt may <br />affext its recommendations <br />Unlc*ss your consulting gc*ot<s hmcal erigmct r iiuficates <br />otherwise, tfour ^rifti\hnu ul rnjintrritui rcr i t stunihl nuf <br />fv used <br />• When the nature of ifie t>fofH)Scsf sirui lure is <br />eft inged for example, if an office buiUling will tx.* <br />erected instead of a fxirking garage or it a n triger- <br />jtc'd '.vaiehouse will i'e built insteatl of an unre- <br />frigeratc*d one. <br />• when the si/e or configuration of the propt'seti <br />strut lure is tjlterc*d <br />• when the Itxalion cm orientatuMi of the protn-sed <br />structure is mcKfifietf <br />• when there is a change of ownershifv (m <br />• for i|>|rlu atit»n to an atfiaienl site <br />GcoR'iIrHual iTtaarctTs lUHiri'I UutTf rsf>ott'<ihlilu far (>r,il hw- <br />uhuh may dtrelof if thru ah' nut u'Msuffo/ a/icr I'aifdrs ,,ufsi(F <br />ereJ in their rerart s de\'t ’!,‘rnirn! tune ihanae.l <br />MOST GEOTECHNICAl "FINDINGS <br />ARE PROFESSIONAL ESTIMATES <br />bile expItMatioii ufentilies at tual sulisurface londiiitMis <br />only at those jMunts wfiere samples are taken whe n <br />they are taken f)ata denvt'd thn tugfi sampling and suf* <br />sequent l,ilxx.itt<rv tesfircg. ue exir irv»ljtetl Iw get>- <br />techriicdl engineers who then render an opinion about <br />overall subsurface conditions, their likely reaction to <br />ptofxrscxi construction activity, and appropriate founda­ <br />tion design Even unefer optimal circumstances actual <br />conditions may differ hc^m those inferred to exist, <br />Ix’cause no geotechnical engineer, no matter how <br />qiialific-d ,md no subsurface exploration program, no <br />m.mer how compre hensive can reveal what is hidden by <br />earth rexic and time The actual interface between mate­ <br />rials may be far nuMe gradual or abrupt than a report <br />iridic.itc*s Actual cenditions in areas not sampled may <br />differ from predictions Noffiirr^ lait he done to prevent the <br />iinanth iruled hut i an he taken to help minimize their <br />imraii For this reason nuxl cxtTru’Mird od'ners retain their <br />aeateihnuai ien^iiltarh thnniah Uw .i'nstru<lion stage, to iden- <br />tifv vanant es t oncluct .KUfilional tests which may be <br />ncedcNl jrvl to recommend solutiims to prtrF^lems <br />enctnintered - mi site <br />SUBSURFACE CONDITIONS <br />CAN CHANGE <br />bubsurtj..c i ondilKMis ma\ U- modified by constantly- <br />V hanging natural force's Because a gc'otechnical engi­ <br />neering re[HMt IS basetl ('P conditions which exisltxl at <br />the time of sut'surface exploration lonstruition decisions <br /><hi>a!d not he luised ('ii a jccfcdrnua/ oraiMivrutg report <br />ihlr'ijiiaiU Mian 'laiv Ivor affected (•y lime S|x*ak with the gtx>- <br />tei hm- a! consultant to learn if additicMial te'sts ari‘ <br />j(Kis.il»li i)e!< *re construction starts <br />CeMistruction ope rations at or adiacent to the site and <br />natural even is -ui h as llooxfs earthquake's m grevjnd- <br />water llih.tuations rna\ jEo .itics t sul'surface conditions <br />and thus the ccmlinuing adc'quaev of a geotechnical <br />refHMt 'h- geotechnical emginevr should be kept <br />apr'ret vl ot .inv sui fi r'venls and should l>e consulted to <br />determine :f .nidition^.l tests arc necc'ssary <br />GEOTECHNICAL SERVICES ARE <br />PERFORMED FOR SPECIFIC PURPOSES <br />AND PERSONS <br />GcsMei hr. (.,1 1 tiginevrs repcMts ju' pic-fsaed to meet <br />tfu' s|xv.itu. newis (*l specifu individuti s A regiorl pre- <br />}v,jre.| ft It I ctMisulting civi! engincvr max mM fx* ade- <br />qu.ite lor .1 umslriK tuMi conlrai lor cm even sonx' other <br />V onsulting nvil c-tigintvr Unless indicated otherwise, <br />the lefxMt was (irejxirisl extuc'ssly Icm the Jienl involved <br />ari'l expresslv tor |'ur|K>s<*s indic ali'd by the client Use <br />bv inv cMher |xrscM)s for any |Hjr|xTse or by the client <br />for aditlereni |>urf>ose may result in fMof'lems NaiMifi- <br />vuiuai Mer than the tluw arrlu Ihis KT<’d /'•' <br />intended inirihy^e leitfum! firxf i .in/crnMa h iIIi the geoleihnual <br />enginrer N.' stu'alJ arrfu f»rn rrrxvf kv airw purrece <br />afisT than that oriainaHti onlrtni'lated n'lthoul first ionferring <br />n'ltM the Ji'oteihnii al enaineer <br />I ^ <br />I