Standard Guide for Purging Methods for Wells Used for Ground Water Quality Investigations

Importancia y uso:

4.1 Purging is done for a variety of reasons and the purging method may depend on the hydrogeologic setting, condition of the well, or the contaminants of interest and well production rates. well hydrological conditions, condition of the well, or the contaminants of interest, and well production rates. This guide presents an approach for selecting an appropriate purging method if purging is to be performed., Water above the screened interval or open borehole may not accurately reflect ambient ground water chemistry.

Note 1: Some sampling methods, such as passive sampling, do not require the practice of purging prior to sample collection (1,2).3

4.2 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 several 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.

Subcomité:

D18.21

Referida por:

D4448-01R19, D7069-24, D6771-21, D6724_D6724M-16R24E01, D6001_D6001M-20, D7929-20

Volúmen:

04.09

Número ICS:

13.060.10 (Water of natural resources)

Palabras clave:

ground water; ground water sampling; indicator parameters; purging; water quality;