What is the EPA clearance value for window troughs?

What is the EPA clearance value for window troughs?

• A. 400 ug/ft2
• B. 40 ug/ft2
• C. 250 ug/ft2
• D. 50 ug/ft2

Answer: (A)

Clearance of dust-lead after window work uses surface-specific limits to decide if cleanup is complete. Window troughs have their own standard because troughs are hard to clean and tend to trap dust, so the required cleanliness level is set higher than for other nearby surfaces. When you’re verifying cleanup, you wipe representative areas on floors, window sills, and window troughs and compare each surface to its respective limit. The trough limit is the one you apply to determine if troughs pass clearance. If trough wipes exceed this limit, more cleaning and another round of testing are needed. For context, floors generally have a lower limit and window sills have a moderate limit, with troughs being the highest among these common surfaces. This framework comes from EPA regulations on lead-based paint cleanup.

Clearance of dust-lead after window work uses surface-specific limits to decide if cleanup is complete. Window troughs have their own standard because troughs are hard to clean and tend to trap dust, so the required cleanliness level is set higher than for other nearby surfaces. When you’re verifying cleanup, you wipe representative areas on floors, window sills, and window troughs and compare each surface to its respective limit. The trough limit is the one you apply to determine if troughs pass clearance. If trough wipes exceed this limit, more cleaning and another round of testing are needed. For context, floors generally have a lower limit and window sills have a moderate limit, with troughs being the highest among these common surfaces. This framework comes from EPA regulations on lead-based paint cleanup.