(1) In this regulation relevant well , in respect of a storage system, means a monitoring well, in respect of the storage system, that has not been decommissioned in accordance with regulation 20 .(2) A responsible person in relation to a storage system must ensure that a relevant well in respect of the storage system is (a) constructed so that cross-contamination between aquifers is prevented; and(b) constructed so that a groundwater-monitoring well screen allows, under any seasonal groundwater conditions, entry of petroleum into the well if petroleum is lost from the storage system; and(c) sealed to exclude surface water; and(d) clearly marked to indicate its presence and purpose; and(e) secured to prevent unauthorised access.Penalty: Fine not exceeding 100 penalty units.