No source at a Department of Energy facility shall emit more than 20 picocuries per square meter per second (pCi/(m\2\-sec)) (1.9 pCi/(ft\2\-sec)) of radon-222 as an average for the entire source, into the air. This requirement will be part of any Federal Facilities Agreement reached between Environmental Protection Agency and Department of Energy. [54 FR 51701, Dec. 15, 1989, as amended at 65 FR 62158, Oct. 17, 2000]