ON 6/12/90 EPA CONDUCTED AN INSPECTION OF THE RESPONDENTS' GREVEY PLANT. DURING THE INSPECTION IT WAS DISCOVERED THAT THE RESPONDENTS HAD NOT CONDUCTED ANY PERFORMANCE TESTS FOR THE EQUIPMENT CONSTRUCTED IN MARCH OF 1989 AND HAD NOT SUBMITTED TO EPA OR TO ANY DELEGATED AGENCY ANY REPORTS CONCERNING THE SAME AS REQUIRED BY 40 CFR 60.8, 60.11 AND 60.675.