Maximum allowable noise levels for construction. A person must not cause or permit noise levels from construction activity that exceed the following levels: From 7 a.m. to 6 p.m.: 75 dBA if the Department has not approved a noise-suppression plan for the activity; or 85 dBA if the Department has approved a noise-suppression plan for the activity. The level specified in Section 19-122(a) at all other times. Construction noise levels must be measured at the location, at least 50 feet from the source, on a receiving property where noise from the source is greatest. The Department must establish requirements for noise-suppression plans and adopt procedures for evaluating and approving plans. The requirements must provide that, at least 10 days before approving a noise-suppression plan, the Director must provide public notice reasonably calculated to reach at least a majority of households that might be affected by the construction activity noise levels above 75 dBA. Construction noise disturbance. The prohibition on noise disturbance in Section 19-122(b) applies to construction activities, notwithstanding subsection (a).