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D 420 – 98 ;RDQYMC05OA__.PDF
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D 420 – 98 ;RDQYMC05OA__
NOTICE:Thisstandardhaseitherbeensupercededandreplacedbyanewversionordiscontinued. ContactASTMInternational(astm.org)forthelatestinformation. Designation:D420 98 StandardGuideto SiteCharacterizationforEngineeringDesignand ConstructionPurposes1 ThisstandardisissuedunderthexeddesignationD420;thenumberimmediatelyfollowingthedesignationindicatestheyearof originaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.A superscriptepsilon(e)indicatesaneditorialchangesincethelastrevisionorreapproval. INTRODUCTION Investigationandidenticationofsubsurfacematerialsinvolvesbothsimpleandcomplex techniquesthatmaybeaccomplishedbymanydifferentproceduresandmaybevariouslyinterpreted. Thesestudiesarefrequentlysitespecicandareinuencedbygeologicalandgeographicalsettings, bythepurposeoftheinvestigation,bydesignrequirementsfortheprojectproposed,andbythe background,training,andexperienceoftheinvestigator.Thisguidehasbeenextensivelyrewrittenand enlargedsincetheversionapprovedin1987.Materialhasbeenaddedforclaricationandfor expansionofconcepts.ManynewASTMstandardsarereferencedandabibliographyofnon-ASTM 88
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