EPA established standards for hazardous waste-burning cement kilns, lightweight aggregate kilns, and incinerators on September 30, 1999 (NESHAP: Final Standards for Hazardous Air Pollutants for Hazardous Waste Combustors) pursuant to section 112(d) of the Clean Air Act (CAA). This rule included not only the standards themselves, but a battery of provisions setting out the means by which the standards would be implemented. Following promulgation of this final rule, the regulated community, through informal comments, raised numerous issues on specific requirements of the rule relating to provisions implementing the emission standards. In response to these concerns, we proposed and requested comment on changes to discrete provisions in the final rule on July 3, 2001. Today's action finalizes some of the amendments proposed in that notice. These amendments do not change the numerical emission standards, but rather focus on improvements to the implementation of the emission standards, primarily in the areas of compliance, testing and monitoring. A related final rule establishing interim emission standards was published in the Federal Register on February 13, 2002.