ASTM_D_6452_-_18.pdf

Designation:D645218Standard Guide forPurging Methods for Wells Used for Ground Water QualityInvestigations1This standard is issued under the fixed designation D6452;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.Scope*1.1 This guide covers methods for purging wells used forground water quality investigations and monitoring programs.These methods could be used for other types of programs butare not addressed in this guide.1.2 This guide applies only to wells sampled at the well-head.1.3 This standard describes seven methods(A-G)for theselection of purging methods.Method AFixed Volume Purging,Method BPurging Based on Stabilization of IndicatorParameters,Method CPurging Based on Stabilization of TargetAnalytes,Method DPurging Based on Fixed Volume Combinedwith Indicator Parameter Stabilization,Method ELow Flow/Low Volume(Minimal Drawdown)Purging,Method FWell Evacuation Purging,andMethod GUse of Packers in Purging.1.4 This guide offers an organized collection of informationor a series of options and does not recommend a specificcourse of action.This document cannot replace education orexperience and should be used in conjunction with professionaljudgment.Not all aspects of this guide may be applicable in allcircumstances.This ASTM standard is not intended to repre-sent or replace the standard of care by which the adequacy ofa given professional service must be judged,nor should thisdocument be applied without consideration of a projects manyunique aspects.The word“Standard”in the title of this guidemeans only that the document has been approved through theASTM consensus process.1.5 This standard does not purport to address all of thesafety concerns,if any,associated with its use.It is theresponsibility of the user of this standard to establish appro-priate safety,health,and environmental practices and deter-mine the applicability of regulatory limitations prior to use.1.6 This international standard was developed in accor-dance with internationally recognized principles on standard-ization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recom-mendations issued by the World Trade Organization TechnicalBarriers to Trade(TBT)Committee.2.Referenced Documents2.1 ASTM Standards:2D653 Terminology Relating to Soil,Rock,and ContainedFluidsD5088 Practice for Decontamination of Field EquipmentUsed at Waste SitesD5092/D5092M Practice for Design and Installation ofGroundwater Monitoring WellsD5521/D5521M Guide for Development of GroundwaterMonitoring Wells in Granular AquifersD6089 Guide for Documenting a Groundwater SamplingEventD6771 Practice for Low-Flow Purging and Sampling forWells and Devices Used for Ground-Water Quality Inves-tigations3.Terminology3.1 Definitions:3.1.1 For definitions of common technical terms in thisstandard,refer to Terminology D653.3.2 Definitions of Terms Specific to This Standard:3.2.1 fixed volume purging,nin ground water sampling,removing a specified number of well volumes to achievepurging.3.2.2 flow-through cell(purging),nin ground watersampling,a vessel that allows purge water to pass over sensorsfor continuous measurement of indicator parameters.1This guide is under the jurisdiction of ASTM CommitteeD18 on Soil and Rockand is the direct responsibility of Subcommittee D18.21 on Groundwater andVadose Zone Investigations.Current edition approved Dec.1,2018.Published December 2018.Originallyapproved in 1999.Last previous edition approved in 2012 as D645299(2012)1.DOI:10.1520/D6452-18.2For 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.*A Summary of Changes section appears at the end of this standardCopyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United StatesThis international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for theDevelopment of International Standards,Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade(TBT)Committee.1 3.2.3 grab sampling device,nin ground water sampling,abailer or similar device that removes an aliquot of water fromthe well with each insertion and removal from the well.3.2.4 low yield well,nin ground water sampling,a wellthat does not produce sufficient water such that the objectivesof purging and sampling cannot be achieved without firstremoving most or nearly all water from the well.3.2.5 packer(purging),nin ground water samplinginmonitoring wells,a transient or dedicated device placed in awell that isolat