ASTM-D6452 2005

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D6452-99(2005) Standard Guide for Purging Methods for Wells Used for Groundwater Quality Investigations

Published By	Publication Date	Number of Pages
ASTM	2005	6

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Categories: 13.060.10 - Water of natural resources, ASTM

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Description

Wells used in groundwater quality investigations or monitoring programs are generally purged prior to sampling (Note 1). Purging is done to minimize the bias associated with stagnant water in the well, which generally does not accurately reflect ambient groundwater chemistry (Note 2).

Note 1Some sampling methods, such as passive sampling, do not require the practice of purging prior to sample collection (1,2) .

Note 2This guide does not address the practice of post-sample purging (purging again after sampling is completed), which is intended for purposes other than the minimization of bias associated with stagnant water in the well.

There are various methods for purging. Each purging method may have a different volume of influence within the aquifer or screened interval. Therefore, a sample collected after purging by any one method is not necessarily equivalent to samples collected after purging by the other methods. The selection of the appropriate method will be dependent on a number of factors, which should be defined during the development of the sampling and analysis plan. This guide describes the methods available and defines the circumstances under which each method may be appropriate.

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PDF Pages	PDF Title
1	Scope Referenced Documents Terminology
2	Significance and Use Criteria and Considerations for Selecting an Appropriate Purging Method Equipment Used for Purging
3	Purging Methods
5	Other Considerations Reporting Keywords REFERENCES

Additional information

Standard Title	D6452-99(2005) Standard Guide for Purging Methods for Wells Used for Groundwater Quality Investigations
Published Code	ASTM
Publication Date	2005
Pages Count	6
ICS Codes	13.060.10 - Water of natural resources

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ASTM-D6452 2005

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