Phase II investigation is typically needed if soil or groundwater contamination is what?

• A. Extensive
• B. Insignificant
• C. Absent
• D. Inconclusive

Answer: (A)

Phase II investigations are the data-gathering step that follows Phase I, providing actual measurements of contaminant concentrations and mapping how far the contamination extends in soil and groundwater. This deeper sampling is needed when contamination is extensive, because you must precisely delineate the plume, understand the magnitude of contamination, and develop a reliable risk assessment and remediation plan. If contamination is insignificant or absent, there’s little justification for costly Phase II work. If results are inconclusive, a Phase II might be pursued to resolve questions, but the typical trigger for moving forward is widespread, substantial contamination.