All hypothetical of course, I am not from the area.
here's the paragraph describing the loophole:
""" “The parking areas, all the travel areas…the pedestrian walkways…that’s all considered inside the station,” Kirst added, explaining what the noise waiver granted to Metro covers. Crews working in those areas aren’t allowed to perform “excavation, demolition, saw cutting, and jack hammering” between 10 pm-6 am on Sunday through Thursdays, and 10 pm-8 am on Friday and Saturday. Those restrictions don’t apply to the tracks outside the stations, however. """