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06-096DEPARTMENT OF ENVIRONMENTAL PROTECTION

APPENDIX C:  Statistical Performance Standards of 40 CFR Part 258.53(h)

(Ground Water Sampling and Analysis Requirements)

1.The statistical method used to evaluate ground water must be appropriate for the distribution of chemical parameters.  If the distribution of the chemical parameters is inappropriate for a normal theory test, then the data should be transformed or a distribution-free theory test should be used.  If the distributions for the constituents differ, more than one statistical method may be needed.

2.If an individual well comparison procedure is used to compare an individual compliance well constituent concentration with background constituent concentrations or a ground water protection standard, the test must be done at a type I error level of no less than 0.01 for each testing period.  If a multiple comparisons procedure is used, the Type I experiment wise error rate for each testing period must be no less than 0.05: however, the Type I error of no less than 0.01 for individual well comparisons must be maintained.  This performance standard does not apply to tolerance intervals, prediction intervals, or control charts.

3.If a control chart approach is used to evaluate ground water monitoring data, the specific type of control chart and its associated parameter values must be protective of human health and the environment.  The parameters must be determined after considering the number of samples in the background data base, the data distribution, and the range of the concentration values for each constituent of concern.

4.If a tolerance interval or a prediction interval is used to evaluate ground water monitoring data, the levels of confidence and, for tolerance intervals, the percentage of the population that the interval must contain, must be protective of human health and the environment.  These parameters must be determined after considering the number of samples in the background data base, the data distribution, and the range of the concentration values for each constituent of concern.

5.The statistical method must account for data below the limit of detection with one or more statistical procedures that are protective of human health and the environment.  Any practical quantitation limit (pql) that is used in the statistical method must be the lowest concentration level that can be reliably achieved within specified limits of precision and accuracy during routine laboratory operating conditions that are available to the facility.

6.If necessary, the statistical method must include procedures to control or correct for seasonal and spacial variability as well as temporal correlation of the data.

Chapter 405: Water Quality Monitoring, Leachate Monitoring, and Waste Characterization

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