Text Equivalent - Figure 1 - The Risk Assessment Toolbox

Figure 1 illustrates the different types of risk assessment approaches that are used to address substances under CMP and the level of complexity for each.

Type 1 approaches are used to address substances or groups of substances with a science-based policy response. These approaches are used when it is considered that a formal conclusion under section 64 of CEPA 1999 is not appropriate at the time. Examples of Type 1 approaches include referral of the assessment to a better-placed federal risk assessment program, or documentation of a substance or group as having been previously addressed by an existing action or initiative under CEPA 1999.

Type 2 approaches are used to address substances using a broad-based approach. These approaches are typically applied to substances that have lower potential for exposure and risk. The assessments may use either qualitative or quantitative approaches to assess the substances, applying conservative (protective) assumptions. Assessments using this approach may or may not make a formal conclusion under section 64 of CEPA 1999. The Rapid Screening Approach and Polymer Rapid Screening Approach are past examples of Type 2 approaches. In upcoming assessments, the proposed approach for ecological risk classification of organic substances (ERC) and the health approach based on threshold of toxicological concern (TTC) are two other examples.

Type 3 approaches are used to address substances using a standard risk assessment approach that considers both hazard and exposure, for either the ecological assessment and/or health assessment, in more detail. Documents may have a similar structure to the typical screening assessments that have been completed under the CMP to date. This type of approach can be sub-divided into three levels representing a continuum of increasingly complex assessment approaches. They may include consideration of a combination of qualitative and quantitative lines of evidence in determining whether a substance or group of substances meet the criteria under section 64 of CEPA. Assessments will be conducted according to a fit-for-purpose approach to focus efforts.

Type 3-1 approaches are streamlined to allow assessment of a substance or group of substances with a reduced effort on either, or both, the hazard or exposure characterization. Examples include adoption of existing hazard characterizations from international organizations, or use of Biological Equivalents (BE) for substances for which biomonitoring (exposure) data are available.

Type 3-2 approaches are those in which de novo exposure and hazard characterizations are undertaken.

Type 3-3 approaches are used to assess substances where a more in-depth consideration of exposure and/or hazard is required than in a type 3-2 assessment. Such assessments could include, for example, consideration of cumulative risk.