19. Neighbouring property: The operating site of quarry may not be closer than 10 m from the property line of any piece of property owned by a party other than the operator of the lot in which the quarry is located. This section shall not have the effect of preventing an operator from continuing to use an operating site within that distance if such operating site was so located on 17 August 1977. In such case, however, it may not be expanded closer to the neighbouring lot.
R.R.Q., 1981, c. Q-2, r. 2, s. 19.