Designation:D4992−22StandardPracticeforEvaluationofRocktobeUsedforErosionControl1ThisstandardisissuedunderthefixeddesignationD4992;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope*1.1Thispracticecoverstheevaluationofrocktobeusedforerosioncontrol.Thecomplexityandextentofthisevaluationwillbegovernedbythesizeanddesignrequirementsoftheindividualproject,thequantityandqualityofrockrequired,andthepotentialriskforpropertydamageorlossofhumanlife.1.2Itisnotintendedthatalloftheevaluationslistedinthispracticebeaddressedforeveryproject.Forsomesmall,lesscriticaljobs,avisualinspectionoftherockmaybeallthatisnecessary.Severaloftheevaluationslistedmaybenecessaryonlarge,complex,high-hazardprojects.Itistheresponsibilityofthedesignertodeterminetheintensityandnumberofevaluationsmadeonanyoneproject.1.3Examinationoftherockatthesource,evaluationofsimilarrockexposedtotheenvironmentatanyfieldinstallations,aswellaslaboratorytestsmaybenecessarytodeterminethepropertiesoftherockasrelatedtoitspredictedperformanceatthesiteofintendeduse(1,2,3,4,5,6).21.4Theexaminationoftherockatitssourceisessentialtoitsevaluationforerosioncontrolandaidsintheplanningofthesubsequentlaboratoryexaminations.Verylargepiecesofrockuptoseveraltonsweightareusedinthecontroloferosion;takegreatcarewiththefielddescriptionsandinthesamplingprogramtoassurethatzonesofimpuritiesorweaknessesthatmightnotoccurinordinarysizespecimensarerecordedandevaluatedfortheirdeleteriouspotentialundertheconditionsofintendeduse.Itisnecessarythattheintendedmethodofrockremovalbestudiedtoascertainwhetherthesamplestakenwillcorrespondtotheblasting,handling,andweatheringhistoryoftherockthatwillfinallybeused(3).1.5Thespecificproceduresemployedinthelaboratoryexaminationsdependonthekindofrock,itscharacteristics,mineralcomponents,macroandmicrostr...
