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    Considerations in Selecting Indicator Parameters for the Statistical Evaluation of Ground-Water Quality

    Published: 01 January 1992

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    An essential component of a detection ground-water monitoring plan is the establishment of a program for the statistical evaluation of ground-water chemistry data. The objective of such a data evaluation program is to assess whether there is statistically significant evidence of ground-water contamination, based on the indicator parameters for the site being monitored. The occurrence of false conclusions of evidence of contamination (Type I errors) or failures to detect contamination when it actually is present (Type II errors) is minimized by the use of appropriate indicator parameters.

    To optimize the effectiveness of a statistical evaluation program, a limited number of indicator parameters should be selected on a site-specific basis, consistent with the following factors: (1) Concentrations of the parameter in contaminant source and background ground-water samples; (2) Hydrogeologic conditions of the site being monitored, particularly as they may affect spatial and temporal variability of parameter concentrations in ground water; (3) Chemical fate and mobility characteristics of the constituents used asindicator parameters; (4) Precision and limitations of the laboratory analytical procedure specified for the parameter; and (5) Characteristics of the existing dataset (if any) for the parameter. This paper explain the importance of the above factors and provides examples from a number of case studies to illustrate their use.


    indicator parameters, statistical evaluation, ground-water monitoring

    Author Information:

    Pastor, EF
    project engineer and principal hydrogeologist, McCulley, Frick & Gilman, Inc., Austin, TX

    Frick, DR
    project engineer and principal hydrogeologist, McCulley, Frick & Gilman, Inc., Austin, TX

    Committee/Subcommittee: D18.99

    DOI: 10.1520/STP19143S