3. In article 2 (interpretation)—
(a)for the definition of “cell bund” substitute—
““cell bund” or “cell wall” means a structure within a disposal area which separates or contains units of waste;”,
(b)after the definition of “haul road” insert—
““impermeable layer” means the geological barrier, whether formed of a single mineral layer or such mineral layer combined with an artificial sealing liner or cap, located at the external facing perimeter of a landfill cell, that has the function of preventing the escape of liquids or gases from that landfill cell;
“landfill cell” means a unit or structure within a landfill site formed of an impermeable layer at its base and sides and, save where the cell only contains inert material, at the top of the unit or structure;”.