Q-2, r. 32 - Regulation respecting hazardous materials

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69. Every underground tank not to be subjected to overhead vehicular traffic shall be sunk
1°  to a depth of at least 60 cm below the natural ground surface and be covered with materials referred to in section 67; or
2°  to a depth of at least 40 cm, be covered with materials referred to in section 67 and be covered with a slab of reinforced concrete at least 10 cm thick.
O.C. 1310-97, s. 69.