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What is the threshold size of bare soil above which it is considered hazardous?
5 square feet
9 square feet
12 square feet
15 square feet
The correct answer is: 9 square feet
The threshold size of bare soil that is considered hazardous is 9 square feet. This size is critical in lead hazard assessments because it helps identify areas of concern where lead contamination could pose a risk. Bare soil can accumulate lead from various sources, including past use of leaded gasoline, lead paint degradation, and industrial emissions. When the area of bare soil exceeds 9 square feet, it indicates a larger potential for children and adults to be exposed to lead-contaminated soil, which can lead to health risks such as lead poisoning. The guideline is established to ensure that environmental assessments properly address contamination before it can affect residents, especially vulnerable populations like children. Thus, understanding the importance of this threshold helps in making effective decisions regarding lead hazard control and remediation efforts.