a The Group I and Group IV Polymer rules were subject to legal challenge and have since been amended by the Hazardous Organic NESHAP (HON). The new final rule regarding these two source categories was published on June 19, 2000 and is found at 65 Fed. Reg. 38,030, 38,030 (June 19, 2000) (to be codified at 40 C.F.R. pt. 63) [hereinafter Polymer NESHAP]. bId. c HWC Final Rule, supra note 748, at 52,860. dId. at 52,875. eId. at 52,890. f NESHAPs for Source Categories; Portland Cement Manufacturing Industry, 64 Fed. Reg. 31,898, 31,900 (June 14, 1999) (to be codified at 40 C.F.R. pt. 63). gSeeRMP Guidance, supra note 859. hRMP Guidance, supra note 859. iRMP Guidance, supra note 859. jEPCRA Factsheet, supra note 1075, at 23.