Can testing combinations in dwelling units, common areas, and exterior sites be mixed together in a single group?

Can testing combinations in dwelling units, common areas, and exterior sites be mixed together in a single group?

• A. Yes, they can be mixed in a single group.
• B. No, they cannot be mixed in a single group.
• C. Only if all readings are below the standard.
• D. Only if XRF results are inconclusive.

Answer: (B)

In lead testing, you group samples by where they came from and by the surface type, and you keep those groups separate. The hazard standards and the interpretation of results are specific to each area type (for example, a dwelling unit vs. a common area vs. an exterior site). Mixing samples from these different locations would blur which space is actually posing a risk and could hide hazards or misrepresent safety for occupants. By evaluating each group against the appropriate standard for that type of space, you get an accurate, defensible assessment of lead hazards. So, combining dwelling unit samples with common-area or exterior-site samples in one group would not be appropriate.

In lead testing, you group samples by where they came from and by the surface type, and you keep those groups separate. The hazard standards and the interpretation of results are specific to each area type (for example, a dwelling unit vs. a common area vs. an exterior site). Mixing samples from these different locations would blur which space is actually posing a risk and could hide hazards or misrepresent safety for occupants. By evaluating each group against the appropriate standard for that type of space, you get an accurate, defensible assessment of lead hazards.

So, combining dwelling unit samples with common-area or exterior-site samples in one group would not be appropriate.