U.S. EPA has published in the Federal Register its action that removes the old Phase I standard (1527-05) from the "All Appropriate Inquiries" Rule (AAI). Until this action, AAI recognized both the old standard and the new standard- ASTM 1527-13.
The major differences between the old and new ASTM Phase I standard include:
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ASTM 1527-05 was the first ASTM standard recognized by U.S. EPA as meeting the requirements of the "All Important Inquiries Rule." (AAI) AAI sets forth the standards and practices necessary for fulfilling the requirements to obtain liability protection (i.e. bona fide purchaser defense) under CERCLA section 101(35)(B). Most Phase I proposals reference 1527-05.