This section provides a special definition for acquisition and displacements under Pub. L. 96-510 or Superfund. The order of activities under Superfund may differ slightly in that temporary relocation may precede acquisition. Superfund is a program designed to clean up hazardous waste sites. When such a site is discovered, it may be necessary, in certain limited circumstances, to alert individual owners and tenants to potential health or safety threats and to offer to temporarily relocate them while additional information is gathered. If a decision is later made to permanently relocate such persons, those who had been temporarily relocated under Superfund authority would no longer be on site when a formal, written offer to acquire the property was made, and thus would lose their eligibility for a replacement housing payment. In order to prevent this unfair outcome, we have provided a definition of initiation of negotiation, which is based on the date the Federal Government offers to temporarily relocate an owner or tenant from the subject property.