ASTM D6452-99(2005)
Historical Standard: ASTM D6452-99(2005) Standard Guide for Purging Methods for Wells Used for Groundwater Quality Investigations
SUPERSEDED (see Active link, below)
ASTM D6452
1. Scope
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.
2. Referenced Documents (purchase separately) The documents listed below are referenced within the subject standard but are not provided as part of the standard.
ASTM Standards
D653 Terminology Relating to Soil, Rock, and Contained Fluids
D4750 Test Method for Determining Subsurface Liquid Levels in a Borehole or Monitoring Well (Observation Well)
D5088 Practice for Decontamination of Field Equipment Used at Waste Sites
D5092 Practice for Design and Installation of Ground Water Monitoring Wells
D5521 Guide for Development of Ground-Water Monitoring Wells in Granular Aquifers
D6089 Guide for Documenting a Ground-Water Sampling Event
Keywords
groundwater; groundwater sampling; indicator parameters; purging; water quality;
ICS Code
ICS Number Code 13.060.10 (Water of natural resources)
DOI: 10.1520/D6452-99R05
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