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IMPORTANT INFORMATION <br />ABOUT YOUR <br />GEOTECHNICAL ENGINEERING REPORT <br />More construction problems are caused by site subsur- <br />face conditions than any other factor. As troublesome as <br />subsurface problems can be. their frequency and extent <br />have'oren lessened considerably in recent years. due in <br />large measure to programs and publications of ASFE,r <br />The Association of Engineering Firms Practicing in <br />the Geosciences. <br />The following suggestions-and observations are offered <br />to help you reduce the geotechnical-related delays, <br />cost-overruns and other costly headaches that can <br />occur during a construction project. <br />A GEOTECHNICAL ENGINEERING <br />REPORT [S BASED ON A UNIQUE SET <br />OF PROJECT-SPEC[F1C FACTORS <br />A geotechnical engineering report is based on a subsur- <br />face exploration plan designed [o incorporate a unique <br />set ofproject-specific Factors. These typically include: <br />the general nature of the structure involved, its size and <br />configuration; the location of the structure on the site <br />and its orientation; physical concomitants such as <br />access roads, parking lots, and underground utilities, <br />and the level of additional risk which the client assumed <br />by virtue of limitations imposed upon the exploratory <br />program. To help avoid costly problems, consult the <br />geotechnical engineer to determine how any factors <br />which change subsequent [o the date of the report may <br />affect its recommendations. <br />Unless your consulting geotechnical engineer indicates <br />otherwise, your geotecNnica{ engineering report should not <br />be used: <br />• When the nature of the proposed structure is <br />changed._for example, if an office building wilt be <br />erected instead of a parking garage, or if a refriger- <br />ated svarehouse will be built instead of an unre- <br />frig?raced one; <br />• when the size or configuration of the proposed <br />structure is altered: <br />- lvhen the location or orientation of the proposed <br />=_tructure is modified: <br />. when there is a change of ownership, ar <br />• for application co an adjacent si [e. <br />GeatecJinlca( ennineers cannot accent resvnnslbility for nrab{erns <br />;VNIL)7 YHall 429e{Oa !t i)1etJ e7 Y2 f10[ LOIL"U{fed Qflfl' ~raLIJYS COn51a- <br />ered in [Heir eaorr ~{eve{cement have t;inrlned. <br />(vIOST GEOTECHNICAL "FIND[NGS" <br />ARC PROFESS(ONP.L ESTIMATES <br />''=1.e t.. a;C "o:~C^ '.,-nit ties aC. ~cl J~CSLrra Cc C~nGILC'S <br />fir, i'; -.:-, <c aClnts ":%'°'_:.. ^Ie5 ale :arec, lire.^. <br />.,. .. .oi E.r..--c[; ::.. .._.l _.,i r'~Ug!15a mCIIC_ ~_n^ _~.-- <br />__~,....~..~CO.'a[a.": __~, -8iP °v[raDClaieC :'/_an- <br />technical engineers who then render an opinion about <br />overall subsurface conditions, their likely reaction to <br />proposed construction activity, and appropriate founda- <br />tion design. Even under optimal dreumstances actual <br />conditions may differ from [hose inferred to exist. <br />because no geotechnical engineer, no matter how <br />qualified. and no subsurface exploration program, no <br />matter how comprehensive, can reveal what is hidden by <br />earth, rock and time. The actual interface between mate- <br />rials may be far more gradual or abrupt than a report <br />indicates. Actual conditions in areas no[ sampled may <br />differ from predictions. NotYli~w can be c{one to prevent tfie <br />unan[inpated. lout steps can 6e taken to hel p minimize t{teir <br />impact. Far [his reason, most e.eperienced owners retain [heir <br />geotechnical cnnndtnn[s tNrouyh the construction stage, to iden- <br />tify variances. conduct additional tests which may be <br />needed. and [o recommend solutions to problems <br />encountered on site. <br />SUBSURFACE CONDITIONS <br />CAN CHANGE <br />Subsurface conditions may be modified by cohstantly- <br />changing natural forces. Because a geotechnical engi- <br />neering report is based on conditions which existed at <br />the time of subsurface exploration, construction decisions <br />should not be based lln a geotedinical engineering report whose <br />adequacu mau Nave been affected by time. Speak with the geo- <br />technical consult¢Int to learn if additional tests are <br />advisable before construction starts. <br />Construction operations at or adjacent to the site and <br />natural events such as floods, earthquakes orground- <br />water fluctuations may also affect subsurface conditions <br />and. thus, the continuing adequacy of a geotechnical <br />report. The geotechnical engineer should be kept <br />apprised of any such events. and should be consulted [o <br />determine if additional tests are necessary. <br />GEOTECHNICAL SERVICES ARE <br />PERFORMED FOR SPECIFIC PURPOSES <br />AND PERSONS <br />~:~eotechnicai engineers' retorts are prepared to meet <br />the'apeelfic needs of specific individuals. A report pre- <br />pared for a can=_ulting civil engineer may not be ade- <br />,uace for a consuuction convaaor, or even. some other <br />consulting civil engln=er. 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