THIS REFERAL CONCERNS LTV STEEL COMPANY INC'S PITTSBURGH COKE WORKS, LOCATED IN PITTSBURGH, ALLEGHENY COUNTY, PA. THE FACILITY, INCLUDING SHUT-DOWN STEEL-MAKING OPERATIONS, COVERS APPROX 318 ACRES OF LAND ON THE NORTH AND SOUTH BANKS OF THE MONONGAHELA RIVER. THE PITTSBURGH WORKS OPERATES FIVE COKE OVEN BATTERIES IDENTIFIED AS P-1,P-2, P-3N, P-3S, AND P-4; A COKE OVER GAS DESULFURIZATION PLANT, AND SEVERAL BOILER UNITS USED FOR COGENERATION OF ELECTRIC POSER FOR THE FACILITY. COKE PRODUCED AT THE PITTSBURGH WORKS IS USED BY LTV STEEL AT ITS STEEL MAKING OPERATIONS. LTV STEEL IS A SUBSIDIARY OF LTV CORPORATION AND IS PRIMATILY ENGAGED IN THE PRODUCTION OF STEEL. LTV STEEL OPERATES SEVERAL FACILITIES INCLUDING TWO STEEL MILLS PRODUC ING FLAT-ROLLED STEEL PRODUCTS, THREE COKE WORKS, A TIN MILL ANDFINISHING OPERATIONS. LTV STEEL ALSO OWNS ALL OF THE CAP ITAL STOCK OF SIX TERMINAL SWITCHING RAILRIAD COMPANIES, AS WELL AS SEVERAL SUBSIDIARY SHIPPING COMPANIESWHICH HANDLE SHIPPING SERVICES AT LTV STEEL'S STEEL PLANTS. FINALLY, LTV STEEL OWNS A MINING COMPANY WHICH OPERATES AN IRON PELLET OPERATION. THIS CASE CONCERNS VIOLATIONS BY LTV STEEL, AT ITS PITTSBURGH FACILITY, OF ALLEGHENY COUNTY HEALTH DEPARTMENT RULES AND REGULATIONS, ARTICLE XX, SECTION 520, WHICH IS PART OF THE FEDERALLY APPROVED AND ENFORCEABLE PENNSYLVANIA STATE IMPLEMENTATION PLAN. SECTION 5