united states office of enforcement and epa 305 r 96 002 environmental protection compliance assurance october 1997 agency 2221a chemical industry national baseline report 1990 to 1994 page contents executive summary es a section 2 overview the 4 b 3 trends in releases transfers reported by toxics release inventory tri 5 c monitoring activities violations 6 d promoting performance through promotion e future directions 7 i introduction 1 us s approach role branch program joint initiatives purpose scope f methodology data limitations g organization background 9 number facilities 14 low income minority