The Brownfields Amendment and AAI have significant implications for both the users and the EPs. The ten criteria included in the Brownfields Amendment provided guidance that EPA has to consider in developing the rules for AAI. Those criteria speak in terms of the user and the EP. It makes no specific distinction between the user and the EP. AAI does not actually make use of the term user. It uses a much more involved definition to account for various parties involved in transactions, including grantees. The language from AAI on applicability may be found in Fig. 4.1. In order to simplify the concept, we will use the ASTM E 1527 terminology for user.