Which surfaces are commonly included in composite samples?

Which surfaces are commonly included in composite samples?

• A. Bare floors, carpeted floors, window sills, window troughs, exterior surfaces
• B. Only bare floors
• C. Only window sills
• D. Only exterior surfaces

Answer: (A)

Composite sampling aims to capture the overall lead dust burden in a space by pooling material from several surfaces where dust tends to accumulate and be encountered. The surfaces listed—bare floors and carpeted floors, window sills, window troughs, and exterior surfaces—are common places where lead dust settles or enters the home. Floors catch dust tracked in from outdoors or shed from paint; window areas are frequent dust collectors due to traffic and opening/closing actions; exterior surfaces can contribute dust brought indoors or shed outdoors that makes its way inside. By combining samples from these varied surfaces, the result better reflects the room’s or building’s general lead contamination level than a sample from any single surface would. Limiting to just one surface could overlook contamination present on other surfaces.

Composite sampling aims to capture the overall lead dust burden in a space by pooling material from several surfaces where dust tends to accumulate and be encountered. The surfaces listed—bare floors and carpeted floors, window sills, window troughs, and exterior surfaces—are common places where lead dust settles or enters the home. Floors catch dust tracked in from outdoors or shed from paint; window areas are frequent dust collectors due to traffic and opening/closing actions; exterior surfaces can contribute dust brought indoors or shed outdoors that makes its way inside. By combining samples from these varied surfaces, the result better reflects the room’s or building’s general lead contamination level than a sample from any single surface would. Limiting to just one surface could overlook contamination present on other surfaces.