Environmental

The Massachusetts Contingency Plan (MCP) under Chapter 21E establishes response actions in tiers. A 'Tier I' classification indicates:

AThe contamination is minor and requires no action
BThe site presents an Imminent Hazard requiring immediate response actions✓ Correct
CThe site has been fully remediated
DThe site is classified as a low-priority cleanup

Explanation

Under the Massachusetts Contingency Plan (310 CMR 40.0000), a Tier I classification designates a site as presenting an Imminent Hazard to health, safety, or the environment. Tier I sites require prompt response actions to address the most serious contamination threats.

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