24. The noise emitted in a quarry or sand pit, represented by the reference noise level obtained at the dwelling or public institution, must not exceed, for any 1-hour interval, the highest of the following sound levels:
(1) residual noise;
(2) 40 dBA between 7:00 p.m. and 7:00 a.m. and 45 dBA between 7:00 a.m. and 7:00 p.m.
The first paragraph does not apply in respect of a dwelling owned or rented to the owner or operator of the quarry or sand pit or to educational institutions and tourist establishments when they are closed.