In a RCRA Facility Investigation (RFI), the facility owner characterizes which of the following?

• A. The local weather patterns
• B. The height of fences
• C. The color of the soil
• D. The nature, extent, direction, rate, movement, and concentration of releases

Answer: (D)

In an RFI, what matters is describing releases—the types of contaminants released, how far and where they’ve affected the site, which directions the contamination is moving, how fast it may spread, and the concentrations present at various locations. This full characterization helps determine the potential risk to people and the environment and guides subsequent cleanup actions. The nature of the releases tells you what substances are involved; the extent shows the geographic footprint; the direction and movement indicate how plumes or flows are progressing; the rate describes how quickly the release or migration is occurring; and concentration provides the amount of contaminant at points in the site or environment. Together, these elements create a complete picture of the releases themselves. Local weather patterns, fence height, or soil color don’t describe the releases or their behavior, so they aren’t what the investigation focuses on.