At least ten days prior to the start of construction, or reconstruction, of 100 feet or more of Main, each Steam Distribution Company shall file with the Department a letter of intent providing details of the proposed construction, except when an Emergency Leak makes such notice impracticable. When such notice is impracticable due to an Emergency Leak, such filing shall be made at the earliest practicable time following remediation of the Emergency Leak.
220 CMR, § 20.04