PART 8: Apportionment between the Members of a Single Class B Liability Group
D.91 The statutory guidance in this Part is issued under section 78F(7) and sets out the principles on which liability should be apportioned within each Class B liability group as it stands after any members have been excluded from liability with respect to the relevant significant pollutant linkage as a result of the application of the exclusion test in Part 7.
D.92 Where the whole or part of a remediation action for which a Class B liability group is responsible clearly relates to a particular area within the land to which the significant pollutant linkage as a whole relates, liability for the whole, or the relevant part, of that action should be apportioned amongst those members of the liability group who own or occupy that particular area of land.
D.93 Where those circumstances do not apply, the enforcing authority should apportion liability for the remediation actions necessary for the significant pollutant linkage in question amongst all of the members of the liability group.
D.94 Where the enforcing authority is apportioning liability amongst some or all of the members of a Class B liability group, it should do so in proportion to the capital values of the interests in the land in question, which include those of any buildings or structures on the land:
(a) where different members of the liability group own or occupy different areas of land, each such member should bear responsibility in the proportion that the capital value of his area of land bears to the aggregate of the capital values of all the areas of land; and
(b) where different members of the liability group have an interest in the same area of land, each such member should bear responsibility in the proportion which the capital value of his interest bears to the aggregate of the capital values of all those interests; and
(c) where both the ownership or occupation of different areas of land and the holding of different interests come into the question, the overall liability should first be apportioned between the different areas of land and then between the interests within each of those areas of land, in each case in accordance with the last two subparagraphs.
D.95 The capital value used for these purposes should be that estimated by the enforcing authority, on the basis of the available information. The value should be estimated in relation to the date immediately before the enforcing authority first served a notice under section 78B(3) in relation to that land. Where the land in question is reasonably uniform in nature and amenity and is divided among a number of owner-occupiers, it can be an acceptable approximation of this basis of apportionment to make the apportionment on the basis of the area occupied by each.
D.96 Where part of the land in question is land for which no owner or occupier can be found, the enforcing authority should deduct the share of costs attributable to that land on the basis of the respective capital values of that land and the other land in question before making a determination of liability.
D.97 If appropriate information is not available to enable the enforcing authority to make an assessment of relative capital values (and, following the guidance at paragraph D.36 above, such information cannot reasonably be obtained), the enforcing authority should apportion liability in equal shares among all the members of the liability group.
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