Environmental Protection Agency (EPA) Lead Risk Assessor Practice Exam

In a multi-family structure with 1,045 units, what is the best approach for sampling?

1. Sample all units at once

2. Assess each dwelling individually

3. Sample every tenth unit

4. Group units by floor

The correct answer is: Assess each dwelling individually

The best approach for sampling in a multi-family structure with 1,045 units is to assess each dwelling individually. This method ensures thorough and accurate evaluation of lead risk in each distinct unit, taking into consideration the unique characteristics and conditions that might affect lead exposure. By assessing each dwelling separately, a detailed understanding of lead presence or absence can be established. This is particularly important in multi-family structures where different units may have varying conditions—such as the age of paint, maintenance levels, and historical renovations—affecting lead risk. Individual assessments allow for a comprehensive risk analysis and helps in tailoring mitigation strategies that are specific to each unit's situation. Other sampling methods might compromise the quality of data. Sampling all units at once could lead to logistical challenges and may not account for variations between units. Sampling every tenth unit might miss significant lead risks present in the units that are not sampled, while grouping units by floor could overlook individual variances among units on the same floor, thereby failing to capture important lead exposure information. Thus, assessing each dwelling individually provides the most reliable basis for understanding and managing lead risks throughout the multi-family structure.