What is the soil clearance limit for contact areas?

What is the soil clearance limit for contact areas?

• A. 400 ppm
• B. 1200 ppm
• C. 4000 ppm
• D. 40 ppm

Answer: (A)

Soil clearance limits tell you the maximum lead by weight allowed in soil that people will touch directly after lead work is finished. For areas that will be in direct contact with hands, the limit is 400 ppm. This threshold helps protect people from ingesting lead through hand-to-mouth transfer when they touch soil around entryways, pathways, or play areas. If soil from these contact areas tests above 400 ppm, remediation or additional cleaning is required until the area meets the limit. Other numbers aren’t used for contact areas: 1200 ppm is used for soil in areas not typically touched, 4000 ppm is not the standard, and 40 ppm is far stricter than typical practice.

Soil clearance limits tell you the maximum lead by weight allowed in soil that people will touch directly after lead work is finished. For areas that will be in direct contact with hands, the limit is 400 ppm. This threshold helps protect people from ingesting lead through hand-to-mouth transfer when they touch soil around entryways, pathways, or play areas. If soil from these contact areas tests above 400 ppm, remediation or additional cleaning is required until the area meets the limit. Other numbers aren’t used for contact areas: 1200 ppm is used for soil in areas not typically touched, 4000 ppm is not the standard, and 40 ppm is far stricter than typical practice.