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Environmental Site Assessment Phase 2

The Environmental Site Assessment Phase 2 (ESA) is a more “intrusive” investigation which collects samples of soil, groundwater or building materials to analyze for quantitative values of various contaminants. This investigation is normally undertaken when a Phase 1 ESA determines a likelihood of environmental impacts onsite.

Example of scope of work for a phase 2

  • Planning of sampling campaign
  • Location of underground infrastructure
  • Completion of field work:
    • Soil sampling
    • Groundwater sampling
    • Surface water sampling
    • Sediments sampling
    • Material sampling
  • Chemical analysis of samples for relevant parameters
  • Interpretation of data
  • Preparation of a comprehensive report documenting the findings, a presentation of the study conclusions, and recommendations to address any environmental impacts noted onsite.

Techniques and methods of investigation

  1. Soils
    • Surface soil sampling (< 1 m) – Hand instruments
    • Shallow soil sampling (2 à 5 m) – Test pits
    • Deep soil sampling (> 7 m) – Drilling
  2. Groundwater
    • Sampling of saturated zone
    • Sampling of vadose zone
    • Sampling of immiscible phases of contamination (heavy or floating)
    • Classification of groundwater
    • Determination of hydrogeological conditions
  3. Surface water
    • Drainage ditches, streams (beaker)
    • Rivers, lakes (specific equipment)
  4. Sediments
    • Ditches and streams (split spoon, grab sample)
    • Rivers, ponds, lakes (coring, grab sample)
  5. Decommissioning materials
    • Bulk sampling
    • Swab sampling

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