Use Level means the maximum permitted use level for each Use Type, as specified in the applicable Notification Form.
Surface water means all water which is open to the atmosphere and subject to surface runoff.
Working level (WL) means any combination of short-lived radon daughters in 1 liter of air that will result in the ultimate emission of 1.3E+5 MeV of potential alpha particle energy. The short-lived radon daughters are—for radon-222: polonium-218, lead-214, bismuth-214, and polonium-214; and for radon-220: polonium-216, lead-212, bismuth-212, and polonium-212.
Barrier Level means the Barrier Level as specified in § 1 of the Product and Underlying Data.
Surface waters means water on the surface of the ground where water does not usually accumulate in ordinary watercourses, lakes, or ponds. This includes any waterborne objects.