1、Designation:D792914Standard 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
2、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 provides guidance and information onpassive sampling techniques for collecting groundwater frommonitoring wells.Pa
3、ssive groundwater samplers are able toacquire a sample at a discrete depth or interval in a well,without the active transport associated with a pump or purgetechnique(1).2Passive groundwater sampling is a type ofno-purge groundwater sampling method where the samplersare left in the well for a predet
4、ermined period of time prior tocollecting the 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 n
5、o-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 guid
6、e 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,a
7、nd ASTM Standards D5903 and D6089 provideguides for planning and documenting a sampling event.Groundwater samples may require preservation(GuideD6517),filtration(Guide D6564),and measures to pack andship samples(Guide D6911).Standard D7069 provides guid-ance on the quality control and quality assura
8、nce of samplingevents.ASTM Standard D5092 provides standard practice forthe design and installation of groundwater monitoring wells,ASTM Standard D5521 provides a standard guide for devel-oping groundwater monitoring wells in granular aquifers,andD6452 provides a standard guide for purging methods u
9、sed ingroundwater quality investigations.Consult ASTM StandardD6724 for a guide on the installation of direct-push ground-water monitoring wells andASTM Standard D6725 for a guideon the installation of direct-push groundwater monitoring wellswith pre-pack screens.1.4 The values stated in SI Units ar
10、e 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 a
11、lso 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
12、 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
13、 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 and hea
14、lth practices and determine the applica-bility of regulatory limitations prior to use.2.Referenced Documents2.1 ASTM Standards:D653 Terminology Relating to Soil,Rock,and ContainedFluidsD3740 Practice for Minimum Requirements for AgenciesEngaged in Testing and/or Inspection of Soil and Rock asUsed in
15、 Engineering Design and ConstructionD4750 Test Method for Determining Subsurface LiquidLevels in a Borehole or Monitoring Well(Observation1This test method is under the jurisdiction ofASTM Committee D18 on Soil andRock and is the direct responsibility of Subcommittee D18.21.04 on GroundwaterSample C
16、ollection and Handling.Current edition approved Aug.15,2014.Published October 2014.DOI:10.1520/D7929-14.2The boldface numbers in parentheses refer to the list of references at the end ofthis standard.Copyright ASTM International,100 Barr Harbor Drive,PO Box C700,West Conshohocken,PA 19428-2959.United States1 Well)(Withdrawn 2010)3D4448 Guide for Sampling Ground-Water Monitoring WellsD5092 Practice for Design and Installation of GroundwaterMonitoring WellsD5521 Guide for Development of Groundwate
