Q-2, r. 7 - Regulation respecting pits and quarries

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39. Rock: Where a quarry is located on the side of a hill, mountain, cliff or slope, the final vertical cut must never exceed 10 m. The operator may make several superimposed vertical cuts of at least 10 m provided such cuts are separated by horizontal terraces at least 4 m in width.
Each horizontal terrace must be covered with vegetation in accordance with section 43.
R.R.Q., 1981, c. Q-2, r. 2, s. 39.