ASTM_D_7929_-_20.pdf

Designation:D792920Standard Guide forSelection of Passive Techniques for Sampling GroundwaterMonitoring Wells1This standard is issued under the fixed designation D7929;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 standard provides guidance and information onpassive sampling techniques for collecting groundwater frommonitoring wells.Passive groundwater samplers are able toacquire a sample from the screen interval in a well,without theactive transport associated with a pump or purge technique(1).2Passive groundwater sampling is a type of no-purgegroundwater sampling method where the samplers are left inthe well for a predetermined period of time prior to collectingthe sample.1.2 Methods for sampling monitoring wells include low-flow purging and sampling methods,traditional well-volumepurging and sampling methods,post-purge grab samplingmethods(for example,using a bailer),passive no-purge sam-pling methods,and active no-purge sampling methods such asusing a bailer to collect a sample without purging the well.Thisguide focuses on passive no-purge sampling methodologies forcollecting groundwater samples.These methodologies includethe use of diffusion samplers,accumulation samplers,andpassive-grab samplers.This guide provides information on theuse,advantages,disadvantages,and limitations of each of thesepassive sampling technologies.1.3 ASTM Standard D653 provides standard terminologyrelevant to soil,rock,and fluids contained in them.ASTMStandard D4448 provides a standard guide to sampling ground-water wells,and ASTM Standards D5903 and D6089 provideguides for planning and documenting a sampling event.Groundwater samples may require preservation(GuideD6517),filtration(Guide D6564/D6564M),and measures topack and ship samples(Guide D6911).Standard D7069provides guidance on the quality control and quality assuranceof sampling events.ASTM Standard D5092/D5092M providesstandard practice for the design and installation of groundwatermonitoring wells,ASTM Standard D5521/D5521M provides astandard guide for developing groundwater monitoring wells ingranular aquifers,and D6452 provides a standard guide forpurging methods used in groundwater quality investigations.Consult ASTM Standard D6724/D6724M for a guide on theinstallation of direct-push groundwater monitoring wells andASTM Standard D6725/D6725M for a guide on the installationof direct-push groundwater monitoring wells with pre-packscreens.1.4 The values stated in SI Units are to be regarded as thestandard.Values in inches(such as with well diameters)aregiven in parentheses,and are provided for information.Use ofunits other than SI shall not be regarded as nonconforming withthis standard.1.5 This guide provides information on passive groundwatersampling in general and also provides a series of considerationswhen selecting a passive groundwater sampling method.However,it does not recommend a specific course of action,and not all aspects of this guide may be applicable in all fieldsituations.This document cannot replace education or experi-ence and should be used in conjunction with professionaljudgment.This ASTM standard is not intended to represent orreplace the standard of care by which the adequacy of a givenprofessional service must be judged,nor should this documentbe applied without consideration of a projects many uniqueaspects.The word“standard”in the title of this documentmeans only that the document has been approved through theASTM consensus process.1.6 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.1.7 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:1This test method is under the jurisdiction ofASTM Committee D18 on Soil andRock and is the direct responsibility of Subcommittee D18.21 on Groundwater andVadose Zone Investigations.Current edition approved Feb.15,2020.Published March 2020.Originallyapproved in 2014.Last previous edition approved in 2014 as D7929-14.DOI:10.1520/D7929-20.2The boldface numbers in parentheses refer to the list of references at the end ofthis standard.*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 int