Which statement accurately differentiates Tier 1 from Tier 2 assessments?

The statement that Tier 2 assessments utilize preliminary data from Tier 1 assessments accurately differentiates the two tiers. Tier 1 assessments serve as an initial screening process where basic information and preliminary evaluations are conducted to propose potential risks or contaminants at a site. The purpose of these assessments is to gather enough initial data to understand whether further, more detailed evaluations are warranted.

In contrast, Tier 2 assessments build upon the findings from Tier 1 by diving deeper into specific areas of concern identified during the initial assessment. They rely on the preliminary data gathered in Tier 1 to refine the understanding of the site's conditions, allowing for a more focused and detailed investigation to determine the extent of contamination or risk.

This structured approach ensures that resources are allocated effectively, as Tier 2 assessments are designed to address and explore only those specific issues flagged in Tier 1, rather than starting from scratch. It emphasizes the relationship between the two tiers, where the initial assessment lays the groundwork for more comprehensive evaluations to follow.