EQUISTAR CHEMICALS, L.P. (Line 6 Sulzer Compressor Upgrade, Tank Car Aromatics Loading, LLDPE Flare Meter, PP Flare Meter, Ethylene Unit Analyzer, Particulate Emission Reduction Project, Parallel Flare Vaporizer, LDPE Compressor Shutdown Improvements, Lines 3 & 4 Hyper Suction GC Analyzer, Ethylene Unit Flare Meter, EP Analyzer Replacement & PP Flare Monitor) (Property Identification Number 110-032-1141) v. ILLINOIS ENVIRONMENTAL PROTECTION AGENCY