The EPA is taking direct final action to indefinitely stay the compliance dates for portions of the national emission standards for hazardous air pollutants (NESHAP) for Group I Polymers and Resins and Group IV Polymers and Resins. This direct final rule stays, indefinitely, the compliance dates for existing affected sources and new affected sources with an initial start up date on or after March 9, 1999, which are subject to the Group I Polymers and Resins and Group IV Polymers and Resins NESHAP requirements for all emission points except equipment leaks. This stay will remain in effect until the date that the amendments to these rules (which were proposed on March 9, 1999) are promulgated, at which point the EPA will publish new compliance dates for these affected sources. The EPA is issuing this stay of the compliance dates for existing affected sources and for new affected sources with an initial start up date on or after March 9, 1999, because of the significant amendments to these NESHAP that were proposed on March 9, 1999. It is unlikely that those amendments will be promulgated before the compliance dates for existing affected sources subject to Group I and Group IV Polymers and Resins regulations (September 5, 1999, and September 12, 1999, respectively).