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IMPORTANT INFORMATION ABOUT YOUR GEOTECHNICAL ENGINEERING REPORT aur• „n~trn,, u~ ~n ;•r. Fhb:mi an: ~:m+sc~! :.y ;itn suhsur- t.n.•_ ,.n~ hw,e, th.,n my ~~thcr tucu,r .~, ~n,uhle:fume as ;ubiurfaCe pn,hb:mi•,:an bc. then freyuener and extent :nave been lesened considerably in recent years, due m large measure [o programs and publications of ASFE; The Association of Engineering Firms Practicing in the Geosciences. The following suggestions and observations are offered to help you reduce the geotechnical-related delays. cost-overruns and other costly headaches that can occur during a construction project. A GEOTECHNlCAL ENGINEERING REPORT IS BASED ON A UNIQUE SET OF PROJECT-SPECIFIC FACTORS A geotechnical engineering report is based on a subsur- face exploration plan designed to incorporate a unique se[ of project-specific factors. These typically include: [he general nature of the structure involved. its size and configuration: the location of the structure on the site and its orientation: physical concomitants such as access roads, parking tots. and underground utilities. and the level of additional risk which the client assumed by virtue of limitations imposed upon the exploratory program. To help avoid costly problems. consult the geotechnical engineer to determine how any factors which change subsequent to the date of the report may affect its recommendations. Unless your consulting geotechnical engineer indicates otherwise. none geotechnical engineering report should not 6e used: . When the nature of the proposed structure is changed. For example. if an office building will be erected instead of a parking garage. or if a refriger- ated warehouse will be built instead of an unre- frigerated one: . •.vhen the size or configuration of the proposed ;trttcture is altered. . ~.vhen the Icca[ion or orientation Jf the propO52d structure is modrfied. • when there is a change of ownenh~o. yr . for application to an adjacent site Geotnknicaf engineer; cannot uazpt responstbitity fur problznr; which may develop i(tltey arz nut ionsul[ed after (actors cmtsiJ- ered in their repur['i Jevelupment have changed. MOST GEOTECHNICAL "FINDINGS" ARE PROFESSIONAL EST[NtATES Site exploration identifies actual subsurface conditions only at those points where samples are taken, when they are taken. Data derived through sampling and sub- sequent laboratory testing are extrapolated by geo- techro,:;l _•ngu+ceri ~.vho rhrn rcnrler an ~prmon ehnu[ overall ;ub~urta,.~ ~_undnwns. rhea hkehr redct+un :u proposed constn:coon acuvrrt. and Sppropnate founda- tion design Even under optimal circumstances actual conditions may differ From those inferred ro exist. because no geotechnica! engineer. no matter how qualified. and no subsurface exploration program. no matter how comprehensive. can reveal who[ is hidden by earth. rock and time. The actual interface between mate- rials may be far more gradual or abrupt than a report indicates. Actual conditions in areas not sampled may differ from predictions. Nu6iing can be dune to prevent rite unanticipated, but steps can tie taken to help mi+rimize their impact. For this reason, most experienced owners retain their geotechnical consultants through the construction stage, to iden- tify variances. conduct additional tests which may be needed, and torecommehd solutions to problems encountered on site. SUBSURFACE CONDITIONS CAN CHANGE Subsurface conditions may be modified by cons[antiy- changing natural forces. Because a geotechnical engi- neering report is based on conditions which existed at the time of subsurface exploration. innstructfon Jerisions shoulA nut be teased ant a geotechnical engineering report whose adequacy may have Peen affected 6y time. Speak with the geo- technical consultant to learn if additional testsare advisable before construction starts. Construction operations a[ or adjacent to the site and natural events such as floods. earthquakes or ground- water Fluctua[fons may also affect subsurface conditions and. thus. the continuing adequacy of a geotechnical repot[. The geotechnical engineer should be kept apprised of any such events. and should be consulted to determine if additional tests are necessary GEOTECHNICAL SERVICES ARE PERFORMED FOR SPECIFIC PURPOSES AND PERSONS Geotechnical engineer; reports are prepared to meet the specific needs of specific individuals. A report ore- pared for a consulting civil engineer may not be ade- quate for a construction contractor, or even some other consulting civil engineer Unless indicated otherwise. this repot[ was prepared expressly for the diem involved and expressly for purposes indicated by the client. Use by any ocher persons For any purpose. or by the client for a different purpose. may result in problems. Nu indi- vidual tither thrtnthe client should apply this report (or its intendeJ purpose without ('first con(errfng with tht geotechnica( engineer Nu person shvuld apply this report JUr any purpust other than rhrn unginally contemplated without tint con(ening wah the geatrchnrcal engineer