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Specifying the Dimensions of Aquatic Life Benchmark Values in Clear Complete and Justified Problem Formulations
Suter, G. Specifying the Dimensions of Aquatic Life Benchmark Values in Clear Complete and Justified Problem Formulations. Integrated Environmental Assessment and Management. Allen Press, Inc., Lawrence, KS, 14(5):631-638, (2018). https://doi.org/10.1002/ieam.4059
This paper addresses the need for a formal and complete problem formulation when deriving aquatic life criteria for water or other benchmark values. It presents 9 dimensions of criteria that should be defined in the problem formulation. This paper will contribute to the revision of the aquatic life criteria guidelines which is under way.
The development of water quality criteria and equivalent benchmark values has primarily relied on standard data and methods. However, it has become clear that they do not adequately address some modes of exposure and effects. Development of criteria that are protective requires an explicit description of the issue, a problem formulation. In particular, the assessment endpoints and other dimensions should be specified for each chemical so that the appropriate data will be obtained and 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 affected is specified. Magnitude and proportion are included, because they are used to calculate the criterion concentration. If uncertainty is considered in the criteria, the proportion of the uncertainty distribution that is protected should be specified. Because effects are related to the duration of exposure and time to 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 criteria may be applicable to particular geographic or climatological areas, water chemistries, or habitat types. Considering and justifying all the dimensions is likely to result in transparent and protective criteria.
DIMENSIONS OF CRITERIA TABLE 1.DOCX
DIMENSIONS OF CRITERIA VERSION FOR RESUBMISSION_FORMATTED.DOCX
DIMENSIONS OF CRITERIA TABLE 2_FINAL.DOCX
Record Details:Record Type: DOCUMENT (JOURNAL/PEER REVIEWED JOURNAL)
Organization:U.S. ENVIRONMENTAL PROTECTION AGENCY
OFFICE OF RESEARCH AND DEVELOPMENT
NATIONAL CENTER FOR ENVIRONMENTAL ASSESSMENT