When is a prevalent sample typically taken during asbestos monitoring?

A prevalent sample is taken before abatement begins to establish baseline conditions for airborne asbestos levels. This initial sampling is crucial as it helps to assess the level of contamination and informs the necessary steps to be taken during the abatement process. By collecting samples prior to any disturbance, it enables workers and safety officials to determine the amount of asbestos present in the environment and thereby plan for safe removal or containment strategies.

Sampling at this stage is vital as it provides a clear understanding of the risks involved and ensures compliance with safety regulations. This data is also essential for comparing post-abatement results to confirm that the area has been properly cleaned and is safe for re-entry.