RESPONDENTS VIOLATED STATE IMPLEMENTATION PLAN OF EMIS- SIONS CONCERNING OPACITY VIOLATIONS AT UNIT 1 & 2. PERMIT AND NSPS OPACITY VIOLATIONS ALSO OCCURRED AT UNIT 2. RESPONDENTS ALSO FAILED TO OPERATE AND MAINTAIN UNIT 2 IN ACCORDANCE WITH GOOD AIR POLLUTION CONTROL PRACTICE AND FAILED TO OPERATE AND MAINTAIN THE ELECTROSTATIC PRECIPATA- TOR.