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Specifying the Dimensions of Aquatic Life Benchmark Values in Clear, Complete, and Justified Problem Formulations
ABSTRACTNations that develop water quality benchmark values have relied primarily on standard data and methods. However, experience with chemicals such as Se, ammonia, and tributyltin has shown that standard methods do not adequately address some taxa, modes of exposure, and effects. Development of benchmark values that are protective requires an explicit description of the issues, a problem formulation. In particular, the assessment endpoints and other dimensions should be specified for each chemical so that the necessary data will be obtained and appropriate analyses will be performed. Assessment endpoints specify the entity and attribute to be protected. In addition, the level of protection, including the magnitude of effect and the proportion effected, is specified. Magnitude and proportion are included because they are used to calculate the benchmark concentration. If uncertainty is considered in the benchmark, the proportion of the uncertainty distribution that is protected should be specified. Because effects are related to the duration of exposure and time for recovery, temporal dimensions should be specified. Clearly described exposure metrics are also needed because the relevant exposure parameter is not always total aqueous concentration. Finally, the benchmark may be applicable to particular geographic or climatological areas, water chemistries, taxa, or habitat types. Considering and justifying all the dimensions is likely to result in protective and more easily communicated benchmarks.Integr Environ Assess Manag2018;14:631–638. Published 2018. This article is a US Government work and is in the public domain in the USA.
Key PointsBenchmark values for aquatic life are based on standard methods.Problem formulation provides an opportunity to identify conditions that make the standard method unsuitable.Problem formulation can be more effective if each of the dimensions of a benchmark value is formally characterized by weighing available evidence.The dimensions relate to the assessment endpoint, the level of protection, temporal dimensions, exposure metrics, and limits of applicability.
Specifying the Dimensions of Aquatic Life Benchmark Values in Clear, Complete, and Justified Problem Formulations
ABSTRACTNations that develop water quality benchmark values have relied primarily on standard data and methods. However, experience with chemicals such as Se, ammonia, and tributyltin has shown that standard methods do not adequately address some taxa, modes of exposure, and effects. Development of benchmark values that are protective requires an explicit description of the issues, a problem formulation. In particular, the assessment endpoints and other dimensions should be specified for each chemical so that the necessary data will be obtained and appropriate analyses will be performed. Assessment endpoints specify the entity and attribute to be protected. In addition, the level of protection, including the magnitude of effect and the proportion effected, is specified. Magnitude and proportion are included because they are used to calculate the benchmark concentration. If uncertainty is considered in the benchmark, the proportion of the uncertainty distribution that is protected should be specified. Because effects are related to the duration of exposure and time for recovery, temporal dimensions should be specified. Clearly described exposure metrics are also needed because the relevant exposure parameter is not always total aqueous concentration. Finally, the benchmark may be applicable to particular geographic or climatological areas, water chemistries, taxa, or habitat types. Considering and justifying all the dimensions is likely to result in protective and more easily communicated benchmarks.Integr Environ Assess Manag2018;14:631–638. Published 2018. This article is a US Government work and is in the public domain in the USA.
Key PointsBenchmark values for aquatic life are based on standard methods.Problem formulation provides an opportunity to identify conditions that make the standard method unsuitable.Problem formulation can be more effective if each of the dimensions of a benchmark value is formally characterized by weighing available evidence.The dimensions relate to the assessment endpoint, the level of protection, temporal dimensions, exposure metrics, and limits of applicability.
Specifying the Dimensions of Aquatic Life Benchmark Values in Clear, Complete, and Justified Problem Formulations
Integr Envir Assess & Manag
Suter, Glenn (author)
Integrated Environmental Assessment and Management ; 14 ; 631-638
2018-09-01
Article (Journal)
Electronic Resource
English
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