What form of lead hazard assessment focuses exclusively on the soil?

The correct answer is focused specifically on the assessment of lead hazards present in the soil. Soil testing is a specialized process that involves collecting and analyzing soil samples to determine the concentration of lead and other heavy metals. This type of assessment is critical because soil can be a significant source of lead exposure, especially in areas near sources of contamination such as industrial sites, highways, or locations with a history of lead use, such as older homes with lead-based paint.

Soil testing involves procedures that ensure accurate and reliable results and typically requires laboratory analysis to quantify the lead levels in the samples taken. This helps inform appropriate measures for remediation or risk management to reduce exposure to lead from soil.

The other choices represent broader or different types of assessments. Overall risk assessment encompasses various aspects, including lead in dust, paint, and soil, making it less focused than soil testing alone. Environmental impact assessments evaluate the potential effects of projects on the environment, including soil but not limited to lead hazards. Dust hazard assessments specifically focus on lead dust levels indoors and their potential health impacts, thus not addressing soil concerns directly.