Designation:D7909−14StandardGuideforPlacementofBlindActualLeaksduringElectricalLeakLocationSurveysofGeomembranes1ThisstandardisissuedunderthefixeddesignationD7909;thenumberimmediatelyfollowingthedesignationindicatestheyearoforiginaladoptionor,inthecaseofrevision,theyearoflastrevision.Anumberinparenthesesindicatestheyearoflastreapproval.Asuperscriptepsilon(´)indicatesaneditorialchangesincethelastrevisionorreapproval.1.Scope1.1Thisguideisforplacingblindactualleaksingeomem-branesbeforeperforminganelectricalleaklocationsurvey.Thegeomembranescanbebare(notcovered)orcanbecoveredwithwaterormoistsoil.1.2Thisguideisintendedtoserveasanadditionalqualitycontrol/qualityassurance(QC/QA)measuretoensurethatleaksthroughthegeomembranearedetectable,siteconditionsareproperforleaklocationsurveys,andavalidandcompleteleaklocationsurveyisperformed.Becausevariousleaklocationpractitionersuseawidevarietyofequipmenttoperformthesesurveysandhaveawiderangeofexpertise,placementofblindactualleaksbytheownerorowner’srepresentativehelpsensurethattheleaklocationsurveyisbeingperformedcorrectlyandcompletely.1.3Placingblindactualleakscanalsoassistindeterminingwhetherornotthesiteconditionspermittheflowofelectriccurrentthroughleaks,whichisnecessaryfordetectingleaksusingelectricalmethods.1.4Forclarification,thisguideisinadditiontothetypicalplacementoftheartificialoractualleaksplacedasdescribedintherelevantASTMInternationalstandardsforthevariousleaklocationmethods.1.5Placingblindactualleaksshouldbedonewiththeconsentandknowledgeofallinvolvedpartiesandspecificallythe“owner”ofthegeomembrane.Geomembranesaretypicallypurchasedandinstalledbydedicatedgeosyntheticinstallerswho“own”thegeomembraneuntiltheownershipgetstrans-ferredtotheenduser.Aprojectmeetingshouldbesetupwiththeowner,theconsultant,thegeosyntheticinstallers,andtheleaklocationcontractor.Theintentiontouseblindleaksshouldbeclearlystatedbytheownerorconsultantsorbothandthescopeandnumbertobeplacedshouldbeunderstoodbyallparties.Theconsultantshouldbroadly...
