Section 3B(4)(e) in West Bengal Land Reforms Rules, 1965.
(e)for actual operation of quarrying or digging or using 3 metres clear margin for every 2.5 metres depth shall be kept from the outer boundary of the adjacent plot or plots and maintained throughout the operation or the sides of the quarry shall be treated so as to form benches in a manner where the height of any bench shall not be more than the width of the bench and a clear margin of 3 metres shall be kept and maintained from the outer boundary of the adjacent land;