Under a proposed first amendment to a consent decree, a settling CAA defendant must pay a $326,500 civil penalty; install seven flare gas recovery systems at five refineries and operate them with minimal downtime; maintain two extra, interchangeable compressors for delivery on short notice; shut down one fence line flare at its Detroit refinery and install nitrogen oxide controls on heaters at its Garyville, Louisiana, and Canton, Ohio, refineries as mitigation projects; and will be given deadline extensions for compliance with certain hydrogen sulfide limits at nine flares.