Which value is associated with Bare Soil - Play Area Criteria in ppm?

Which value is associated with Bare Soil - Play Area Criteria in ppm?

• A. 1200 ppm
• B. 5000 ppm
• C. 400 ppm
• D. 0 ppm

Answer: (C)

The main idea is that soil in a child’s bare play area is considered more hazardous and is evaluated against a lower lead level. The Bare Soil - Play Area Criteria uses 400 ppm as the threshold. This value reflects the higher risk from direct soil contact and hand-to-mouth behavior typical in play areas, so a screening target of 400 mg/kg helps determine when remediation or protective actions are needed. Soils at or below 400 ppm are treated as lower risk for a play area, while soils above this level would prompt cleanup measures. For context, other outdoor areas or lawn soil often have higher screening values (for example, around 1,200 ppm) because exposure patterns differ, but the play area criterion is intentionally lower due to children's behavior. Zero ppm isn’t realistic in most soils, and 5,000 ppm would indicate substantial contamination well beyond the standard screening threshold.

The main idea is that soil in a child’s bare play area is considered more hazardous and is evaluated against a lower lead level. The Bare Soil - Play Area Criteria uses 400 ppm as the threshold. This value reflects the higher risk from direct soil contact and hand-to-mouth behavior typical in play areas, so a screening target of 400 mg/kg helps determine when remediation or protective actions are needed.

Soils at or below 400 ppm are treated as lower risk for a play area, while soils above this level would prompt cleanup measures. For context, other outdoor areas or lawn soil often have higher screening values (for example, around 1,200 ppm) because exposure patterns differ, but the play area criterion is intentionally lower due to children's behavior. Zero ppm isn’t realistic in most soils, and 5,000 ppm would indicate substantial contamination well beyond the standard screening threshold.