Designation:D7240−06(Reapproved2011)StandardPracticeforLeakLocationusingGeomembraneswithanInsulatingLayerinIntimateContactwithaConductiveLayerviaElectricalCapacitanceTechnique(ConductiveGeomembraneSparkTest)1ThisstandardisissuedunderthefixeddesignationD7240;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisstandardisaperformance-basedpracticeforusingthesparktesttoelectricallylocateleaksinexposedgeomem-braneswithaninsulatinglayerthatareinintimatecontactwithaconductivelayer.Forclarity,thisdocumentusestheterm‘leak’tomeanholes,punctures,tears,cuts,cracksandsimilarbreachesoverthepartialorentireareaofaninstalledgeomem-brane(asdefinedin3.2.3).1.2Thistestmethodcanbeusedonexposedgeomembranesinstalledinbasins,ponds,tanks,oreandwastepads,landfillcells,landfillcaps,andothercontainmentfacilities.Thisstandardisapplicableforgeomembranesindirectandintimatecontactwithaconductivesurfaceorwithaconductivelayerintegrallyincluded.1.3SAFETYWARNING:Theelectricalmethodsusedforgeomembraneleaklocationusehighvoltage,lowcurrentpowersupplies,resultinginthepotentialforelectricalshock.Theelectricalmethodsusedforgeomembraneleaklocationshouldbeattemptedbyonlyqualifiedandexperiencedperson-nel.Appropriatesafetymeasuresmustbetakentoprotecttheleaklocationoperatorsaswellasotherpeopleatthesite.1.4Thisstandarddoesnotpurporttoaddressallofthesafetyandliabilityconcerns,ifany,associatedwithitsuse.Itistheresponsibilityoftheuserofthisstandardtoestablishappropriatesafetyandhealthpracticesanddeterminetheapplicabilityofregulatorylimitationspriortouse.2.ReferencedDocuments2.1ASTMStandards:2D4439TerminologyforGeosyntheticsD6747GuideforSelectionofTechniquesforElectricalDetectionofLeaksinGeomembranes3.Terminology3.1DefinitionoftermsapplyingtothistestmethodappearinTerminologyD4439.3.2Definitions:3...
