Composite samples should be collected from where?

Composite samples should be collected from where?

• A. Bare floors, carpeted floors (wall to wall carpet), window sills, window troughs, exterior surfaces
• B. Window sills only
• C. Bare floors only
• D. Exterior surfaces only

Answer: (A)

Composite sampling is used to get a representative measure of lead dust across the areas most likely to accumulate it. Dust lead burden is not uniform; different surfaces collect dust to different extents based on traffic, cleaning, and proximity to sources. By taking wipes from a variety of surfaces—bare floors, carpeted floors, window sills, window troughs, and exterior surfaces—you capture the variation in dust deposition and create a single composite result that better reflects the overall contamination in the space. Sampling only one surface could miss hot spots or under- or overestimate the true level of lead dust.

Composite sampling is used to get a representative measure of lead dust across the areas most likely to accumulate it. Dust lead burden is not uniform; different surfaces collect dust to different extents based on traffic, cleaning, and proximity to sources. By taking wipes from a variety of surfaces—bare floors, carpeted floors, window sills, window troughs, and exterior surfaces—you capture the variation in dust deposition and create a single composite result that better reflects the overall contamination in the space. Sampling only one surface could miss hot spots or under- or overestimate the true level of lead dust.