The following principles are established for determination of the financial limit of clearance operations at excess installations:
(a) Government-owned land. Clearance work will not be undertaken where the estimated cost thereof exceeds the value of the land after decontamination plus the estimated cost of keeping it security-fenced and posted for a period of 25 years.
(b) Leased land. Clearance will not be undertaken where the estimated cost, plus the cost of any other required land restoration work, exceeds the value of the land after clearance and restoration plus the estimated cost of keeping it security-fenced and posted for a period of 25 years.