Which method is part of the HEPA sandwich technique for moderate/high risk cleanup?

The HEPA sandwich technique is a crucial method used in lead abatement and risk assessment practices, particularly for moderate to high-risk cleanup situations. This technique involves a systematic approach that ensures thorough removal of lead dust and debris while minimizing the risk of further contamination.

C stands out as the correct answer because it encapsulates the dual-pronged approach of the HEPA sandwich technique, which includes both HEPA vacuuming and the washing of surfaces. HEPA vacuuming is essential as it utilizes High-Efficiency Particulate Air (HEPA) filters that effectively trap lead dust particles, preventing them from becoming airborne during the cleanup process. This is critical in controlling exposure to lead, which can have significant health implications.

Following the vacuuming, washing surfaces helps to remove any residual lead dust that may still adhere to surfaces. The combination of these two methods—vacuuming with a HEPA filter and washing—ensures a more comprehensive cleanup, thereby significantly reducing the risk of lead exposure for occupants and workers in the area.

In contrast, other methods listed, such as using a broom or a regular vacuum, would not offer the same level of efficacy in managing lead dust. Brooms can merely displace dust into the air rather than effectively removing it,