Classifying Drinking Water Contaminants for Regulatory Consideration (2001) / Chapter Skim
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Pages 211-222
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Appendix A The European Prioritization Schemes "COMMPS" AND "DYNAMEC" INTRODUCTION This appendix provides an overview of two European rule-based schemes for identifying and prioritizing substances (primarily chemicals) that may pose risks to freshwater and marine environments and human health through these aquatic environments.
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the commission to establish a List of Substances based on their risk to the aquatic environment and to human health through the aquatic environment. To create such a list expediently, the EC decided that a simplified risk-based assessment procedure was needed that would account for the intrinsic health and environmental hazards of substances of concern based on monitoring and modeling data.
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based on surface water monitoring data and the other on modeling data. Further lists were established for pollutants adsorbed by sediments and for metals based exclusively on monitoring data.
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A DYNAMIC MECHANISM FOR SELECTING AND PRIORITIZING HAZARDOUS SUBSTANCES (DYNAMEC) The OSPAR Commission was founded as a result of the 1992 Oslo and Paris (OSPAR)
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FIGURE A-1 Simplified overview of steps and procedures within the DYNAMEC mechanism and work carried out under DYNAMEC. NOTE: PTB = substance that is persistent (P)
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The Chemical Universe DYNAMEC considered that there are approximately 250,000 manmade chemicals in the so-called chemical universe. Thus, it would clearly not be possible to assess and rank all of these chemicals in a substantive manner.
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The Safety Net Procedure Under DYNAMEC, "hazardous substances" refers not only to substances or groups of related substances that are toxic, persistent, and liable to bioaccumulate, but also to those that are deemed by OSPAR to require a similar assessment approach -- even if they do not meet the criteria for toxicity, persistence, and bioaccumulation. To help select substances with an "equivalent level" of concern, DYNAMEC agreed to supplement the initial selections by a "safety net" procedure.
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sheets would provide comprehensive but concise background information, such as physical-chemical properties and production/use volume information (where available)
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data processing and was followed by expert judgment (e.g., on the basis of chemical fact sheets)
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"Selection Box" of 80 substances To facilitate these discussions, a selection box of 80 substances (all chemicals) was extracted by combining the 48 top-ranked substances from the four ranked lists (excluding certain substances already included on the 1998 OSPAR List of Chemicals for Priority Action)
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TABLE A-1 Selection Box Groups Group Contents Description A 5(13) a Substances of very high concern (i.e., POP-like substances or substances with severe PTB profile)
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NRC (National Research Council)
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