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In December 1993, the Environmental Protection Agency (EPA) submitted a Report to Congress with its findings on the nature of, and management practices associated with cement kiln dust (CKD). In 1995, EPA determined that control of CKD under subtitle C of the Resource Conservation and Recovery Act (RCRA) was warranted and published a regulatory determination (60 FR 7366). On August 20, 1999, EPA issued a proposed rule (64 FR 45632) outlining the Agency's preferred regulatory approach (i.e., an exemption from hazardous waste listing for properly managed CKD) and several optional approaches including requirements solely under RCRA subtitle D. On July 25, 2002, the Agency published a notice (67 FR 48648) to announce the availability for public inspection and comment of recently acquired data on CKD. The Agency continues to consider the proposal and notice; and may issue an additional notice of data availability (NODA) to update certain information or issue a re-proposal.