ADMINISTRATIVE PENALTY ORDER FOR VIOLATIONS OF WIS. SIP VISABLE EMISSIONS, AND OPACITY LIMITATIONS. IROQUOIS FOUNDRY PRODUCES GREY IRON CASTINGS FROM SCRAP METAL. EMISSION SOURCES AT THE PLANT INCLUDE A CUPOLA FURNA CE WHICH WAS INSTALLED IN 1997, DOCUMENTED VIOLATIONS OF OPACITY AND CARBON MONOXIDE (CO) REGULATIONS AT THE CUPOLA. STACK TESTS EXCEEDANCES OF THE PM LIMITS CONTAINED IN THE WISCONSIN SIP. TO COMPLY WITH THE CO AND THE PM LIMITS, IROQUOIS FOUNDRY INSTALLED AN AFTER BURNER FOR THE CUPOLA AND UPGRADED THE VENTURI SCRUBBER SYSTEM. THIS CASE WAS RESOLVED BY ISSUING A CACO AND A 113(A) ORDER.