A settling CAA defendant that violated PSD provisions, new source performance standard provisions, and the Ohio SIP's opacity limits when it emitted hazardous air pollutants from its ferroalloy production facility in Waterford, Ohio, must pay a $2.6 million civil penalty, construct a new baghouse, restrict sulfur content of process inputs to specified limits, implement a detailed monitoring regime to address opacity concerns, and extend its sulfur content limits and Subpart Z obligations to all furnaces at the facility.