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The Maximum Achievable Control Technology (MACT) standard for Mineral Wool Production was promulgated on June 1, 1999, and the MACT for Wool Fiberglass Production was promulgated on June 14, 1999. The Clean Air Act requires EPA to evaluate the risk remaining to human health within 8 years of promulgation of each MACT standard; for these regulations, that date expired in June 2007. Along with risk, the EPA is also required to review new technology in the industry that can reduce hazardous air pollutant (HAP) emissions from regulated sources in the industry, and may consider costs under this technology review. EPA is addressing these Clean Air Act requirements under a combined risk and technology review (RTR). EPA was petitioned to review the risk for these source categories, and also to determine MACT floors for pollutants and processes that were not regulated by the MACT standards. The Court entered into an agreement with EPA and the litigants; the resulting deadline for proposal was November 4, 2011. The supplemental proposal was published in the Federal Register on April 15, 2013 (78 FR 22370). A second supplemental proposal is expected to be signed by the Administrator on October 15, 2014 (due for publication on November 5, 2014); and the promulgation of the two RTRs and a final rule for wool fiberglass area sources is scheduled for June 15, 2015.