ASTM_D_7852_-_13.pdf

Designation:D785213Standard Practice forUse of an Electrically Conductive Geotextile for LeakLocation Surveys1This standard is issued under the fixed designation D7852;the number immediately following the designation indicates the year oforiginal adoption or,in the case of revision,the year of last revision.A number in parentheses indicates the year of last reapproval.Asuperscript epsilon()indicates an editorial change since the last revision or reapproval.1.Scope1.1 This standard practice describes standard procedures forusing a conductive geotextile with electrical methods to locateleaks in exposed geomembranes and geomembranes coveredwith water or earth materials containing moisture.1.2 This standard practice provides guidance for the use ofappropriate conductive geotextile used in leak location surveyon geomembrane.This guide includes all types of conductivegeotextile with sufficient conductivity for the particular elec-trical leak location method.A conductive geotextile is appli-cable to all types of geoelectric surveys when there is otherwisenot a conductive layer under the geomembrane.1.3 The leak stream itself being adequately conductive.Aconductive geotextile is applicable to all types of geoelectricsurveys when there is otherwise not a conductive layer underthe geomembrane.1.4 This standard practice is intended to ensure that leaklocation surveys can always be performed with a reasonablelevel of certainty.This standard practice provides guidance forthe use of appropriate conductive geotextile used in leaklocation survey on geomembranes.1.5 Leak location surveys can be used on non-conductivegeomembranes installed in basins,ponds,tanks,ore and wastepads,landfill cells,landfill caps,other containment facilitiesand building applications such as in parking garages,decks andgreen roofs.The procedures are applicable for geomembranesmade of non conductive materials such as polyethylene,polypropylene,polyvinylchloride,chlorosulfonatedpolyethylene,bituminous material,and other electrically-insulating materials.Leak location survey involving conduc-tive or partially conductive geomembranes are not within thescope of this document.1.6 WarningThe electrical methods used for geomem-brane leak location could use high voltages,resulting in thepotential for electrical shock or electrocution.This hazardmight be increased because operations might be conducted inor near water.In particular,a high voltage could exist betweenthe water or earth material and earth ground,or any groundedconductor.TheseproceduresarepotentiallyVERYDANGEROUS,and can result in personal injury or death.Because of the high voltage that could be involved,and theshock or electrocution hazard,do not come in electrical contactwith any leak unless the excitation power supply is turned off.The electrical methods used for geomembrane leak locationshould be attempted only by qualified and experienced person-nel.Appropriate safety measures must be taken to protect theleak location operators as well as other people at the site.1.7 This standard guide does not purport to address all ofthe safety and liability concerns,if any,associated with its use.It is the responsibility of the user of this standard guide toestablish appropriate safety and health practices and deter-mine the applicability of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:2D4439 Terminology for GeosyntheticsD6747 Guide for Selection of Techniques for ElectricalDetection of Leaks in GeomembranesD7002 Practice for Leak Location on Exposed Geomem-branes Using the Water Puddle SystemD7007 Practices for Electrical Methods for Locating Leaksin Geomembranes Covered with Water or Earth Materials3.Terminology3.1 For general definitions related to geosynthetics,seeTerminology D44393.2 Definitions:3.2.1 conductive geotextile,na geotextile fabricated in aplant using conductive materials,in part or in whole,andproviding a sufficient electrical conductivity to perform elec-trical leak location.D70023.2.2 electrical leak location,nany method which useselectrical current or electrical potential to locate leaks.D70021This practice is under the jurisdiction of ASTM Committee D35 on Geosyn-thetics and is the direct responsibility of Subcommittee D35.10 on Geomembranes.Current edition approved Jan.15,2013.Published February 2012.DOI:10.1520/D7852132For referenced ASTM standards,visit the ASTM website,www.astm.org,orcontact ASTM Customer Service at serviceastm.org.For Annual Book of ASTMStandards volume information,refer to the standards Document Summary page onthe ASTM website.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 3.2.3 leak,nfor the purposes of this document,a leak isany unintended opening,perforation,breach,slit,tear,puncture,crack,or seam breach through which liquid can flow.Scratches,gouges,dents,or other aberrations that do notcompletely penetrate the geomembrane are not considered tobe leaks.Leaks det