What is described as "worst case sampling" in lead inspection?

"Worst case sampling" in lead inspection refers to a method where specific units are chosen for inspection based on a visual assessment of conditions that are most likely to show lead hazards. This approach is based on identifying scenarios or locations within a property where lead exposure risk is expected to be highest, such as areas with deteriorated paint, dust, or soil contamination.

By focusing on these higher-risk units, inspectors can ensure that their findings provide a realistic picture of potential lead hazards that occupants may face. This method is particularly effective because it prioritizes the investigation of environments that pose the most significant risk, which is critical for protecting public health, especially for vulnerable populations like children and pregnant women.

Other options do not meet the criteria for worst case sampling: random selection does not target high-risk areas, quantitative analysis of all units would require extensive resources without necessarily identifying the most severe hazards, and passive monitoring does not actively assess conditions that might indicate lead contamination. Thus, the visual assessment approach ensures that the inspection effectively addresses the most pressing concerns regarding lead exposure.