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This guidance document describes key principles and best practices for Brownfields site assessment quality assurance and quality control based on program experience. It is intended as a reference for people involved in the Brownfields site assessment process. This guidance manual does not constitute a rulemaking by the U.S. Environmental Protection Agency (EPA). The policies set forth in this document are intended solely as guidance. They are not intended, nor can they be relied upon, to create any substantive or procedural rights enforceable by any party in litigation with the United States. EPA officials may decide to follow the guidance provided in this directive, or may take action that is at variance with the guidance, policies, and procedures in this directive, on the basis of an analysis of specific circumstances. The Agency also reserves the right to change this directive without public notice. Mention of trade names or commercial products does not constitute endorsement or recommendation for use