EPA Lead Supervisor Course Practice Exam

If an XRF reading is 0.8 mg/cm2 on all tested locations, classification?

Positive. Inconclusive. Negative. Not testable.

Correct Answer:

Negative.

Explanation:

In lead paint assessments, the XRF screening uses an action level of 1.0 mg/cm2. If a reading is at or above this level, the surface is considered to contain lead-based paint (positive). If a reading is below 1.0 mg/cm2, it is not considered lead-based paint above the threshold (negative). Since the measurement is 0.8 mg/cm2 at all tested locations, every reading is below the action level. Therefore, the surfaces are classified as negative for lead-based paint.

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