Which surfaces are included in clearance dust-wipe sampling after the visual assessment is complete?

Which surfaces are included in clearance dust-wipe sampling after the visual assessment is complete?

• A. Floors
• B. Interior window sills
• C. Window troughs
• D. All of the above

Answer: (D)

The key idea is that clearance dust-wipe sampling targets surfaces most likely to hold lead dust after work is done, to verify the area meets the standard for cleanliness. Floors, interior window sills, and window troughs are all included because each type can accumulate lead dust in different ways: dust settles on floors from general contamination and activities; interior window sills collect dust that can come from window opening, painting, or splatter near the window; and window troughs near the bottom of the window frame can trap dust that drifts down during cleaning or from disturbed paint. Sampling all of these surfaces ensures the cleanup is effective across the main areas where occupants could be exposed. So the surfaces included are floors, interior window sills, and window troughs — all of the above.

The key idea is that clearance dust-wipe sampling targets surfaces most likely to hold lead dust after work is done, to verify the area meets the standard for cleanliness. Floors, interior window sills, and window troughs are all included because each type can accumulate lead dust in different ways: dust settles on floors from general contamination and activities; interior window sills collect dust that can come from window opening, painting, or splatter near the window; and window troughs near the bottom of the window frame can trap dust that drifts down during cleaning or from disturbed paint. Sampling all of these surfaces ensures the cleanup is effective across the main areas where occupants could be exposed. So the surfaces included are floors, interior window sills, and window troughs — all of the above.