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| You are here > Introduction > Stage 2 > Supplementary Phase II ESA Stage 2: Evaluation and Planning - Technical - Supplementary Phase II ESA |
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A supplementary Phase II ESA is used to support a Risk Assessment (RA) and must be conducted under the supervision of a Qualified Person (QP). Understanding the requirements of a RA and ensuring that all required data is properly obtained will help streamline the RA acceptance process and avoid unscheduled delays.
The QP conducting the Phase II ESA in support of a RA should foster a team approach at an early stage and, as a minimum, follow CSA Standard Z769. The supplemental Phase II ESA should build on Phase I and Phase II findings and allow for iterative sampling to address data gaps.
Additional Data Requirements for Risk Assessment:
- Detailed groundwater characterization to assess the separate groundwater exposure pathways
- Soil gas sampling (and indoor air sampling, if applicable)
- Sampling of soil for organic carbon content to assess attenuation of contaminants and vapour
- Other data (surface water, biota, sediments, etc.)
Common Pitfalls:
- Available data (e.g., Phase I ESA) not reviewed to develop conceptual site model
- Inadequate attention to field protocols - QA/QC, sample collection, screen lengths, soil gas probes
- Inadequate verification sampling following remediation
- Use of incorrect Method Detection Limits (MDLs) or analytical techniques
- Potential for off-site contamination not addressed
- Improper selection of standards - sensitive site, coarse or medium/fine textured soil
- All potential COCs not analyzed
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