220 CMR, § 112.60
Each operator shall notify the Department of any modifications of, or change in, a component or facility at an LNG plant estimated to cost $50,000 or more. Except in an emergency, notification shall include a written detailed description and shall be submitted to the Department at least 30 days before the modification or change may be made. In other, nonemergency situations where 30-days notice is impracticable, the Department may allow work effecting the modification or change to begin after the elapse of at least 24 hours or some other period of less than 30 days following its receipt of notification. In the event of a bona fide emergency, the operator may, without prior notice to the Department, commence such modifications as circumstances require but shall notify the Department as soon as is practicable.
220 CMR, § 112.60