What is the minimum sample size for a dust wipe on a window sill or well/trough?

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Multiple Choice

What is the minimum sample size for a dust wipe on a window sill or well/trough?

Explanation:
The key idea is that wipe samples must cover a sufficient surface area to give a representative estimate of lead dust on that surface. For a dust wipe on a window sill or well/trough, the standard minimum area to wipe is 16 square inches (about a 4 inch by 4 inch patch). This size provides enough material for the lab to accurately detect and quantify lead dust and to compare results meaningfully to the applicable standards. Wiping a much smaller area could miss dusty spots and produce an unreliable result, while wiping a larger area is acceptable but not necessary for meeting the minimum requirement.

The key idea is that wipe samples must cover a sufficient surface area to give a representative estimate of lead dust on that surface. For a dust wipe on a window sill or well/trough, the standard minimum area to wipe is 16 square inches (about a 4 inch by 4 inch patch). This size provides enough material for the lab to accurately detect and quantify lead dust and to compare results meaningfully to the applicable standards. Wiping a much smaller area could miss dusty spots and produce an unreliable result, while wiping a larger area is acceptable but not necessary for meeting the minimum requirement.

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