(a) Any owner whose PCBs are involved in a spillage, leak, explosion, or other mishap, and who has or should have knowledge thereof, shall commence clean-up operations within two hours after the mishap.
(b) Until the area involved in the spillage, leak, explosion or other mishap has been certified by an appropriate governmental agency as no longer constituting a possible hazard of personal injury or property damage, the area shall be cordoned off and appropriate warnings as required by the Director of Public Service and Development shall be posted.