**At tachment A**  **- Operation and Maintenance Summary Commenced**  **Restart Description**  4/25/99 5/3/99 Reworked compressor blow off valves. Installed new catalyst. Minor maintenance repairs, & calibration of instrumentation. 12/6/99 12/16/99 Plant shut down on Dec 6th due to high inventory . Repaired steam leaks, Replaced Some Valves and Re certification of PSV’s. 12/29/00 1/12/00 Y2 K turnaround. Inspected equipment and made minor repairs where necessary . Installed new catalyst. Remove, repair & reinstall catalyst support grid. 5/10/00 5/17/00 Shutdown for repair of expansion joint liners. Design deficiency found in many

expansion joint liners. 10/4/00 10/9/00 Inventory shutdown- Minor maintenance repairs where necessary

. 10/10/00 12/29/00 Major air compressor wreck. Replaced all air compressor internals. Inspect X-101 gearbox buy Lufkin industries. MOC-2000-090 P220,230,240,113,114,150,195A/B HOA. Change distance piece on P-200 to SS. Minor maintenance repairs where necessary & calibration of instrumentation that needed a S/D. 4/23/01 4/28/01 Inventory shutdown- Minor maintenance repairs where necessary & calibration of instrumentation that needed a S/D. 5/29/01 6/13/01 Inventoryshutdown- CEG, Turbine inspection. Inspection for Air Compressor. Repack steam valve on C101D. Minor maintenance repairs where necessary & calibration of instrumentation that needed a S/D.
1/6/02 1/11/02 Shutdown to replace blades in air compressor. Better design. CEG, ELLIOTT, SULZER REP and GHH REP

FOR C-101A, Minor maintenance repairs where necessary & calibration of instrumentation that needed a S/D. 4/14/02 4/19/02 Gauze change. Critical motors elect tested, Install smart positioners, Replace steam drum sight glass root valves, Replace filters and Inspections were done. 5/17/02 5/24/02 Shutdown due to inventory . W hile down changed SCR catalyst. Changed Foxboro Board, electronic overspeed checked machines. 12/8/02 12/14/02 Gauze change. Minor maintenance repairs where necessary & calibration of instrumentation that needed a S/D. 12/14/03 12/19/03 Gauze change. SCR Level checked, Replaced filters, Calibrations of Instrumentation, Minor Maintenance Repairs 10/11/04 10/18/04 Air Comp, Expander, and Turbine were all inspected during turnaround. Changed compressor inlet air filters. Re certification of relief valves, Vessel and exchangers inspections 5/14/05 5/19/05 Inventory shutdown- Re certification of relief valves, Minor maintenance repairs where necessary & calibration of instrumentation that needed a S/D. 9/11/05 9/18/05 Modified boiler and changed gauze. Inspections for C101D, C101A Compressor Train, Re certification of relief valves, Vessel and exchangers inspections, Minor maintenance repairs where necessary & calibration of instrumentation that needed a S/D. 9/21/05 10/2/05 Hurricane Rita, Replace zinc cooling tower hangers and minor maintenance repairs that were necessary
12/11/05 12/18/05 Replace Neugent W ith 3-W ay Valves, TRICONEX Service W ork, Re certification of relief valves, Vessel and exchangers inspections, Minor maintenance repairs where necessary & calibration of instrumentation that needed a S/D. 4/23/06 4/29/06 Gauze change and DCS upgrade. Re certification of relief valves, vessel and exchangers inspections, Minor maintenance repairs where necessary & calibration of instrumentation that needed a S/D.
10/16/06 10/21/06 Plant shutdown & repair due to malfunction of Baluff linear transducer (device that provides the Steam turbine governor valve SVC-6101 position feedback signal). Also repaired XV-6845 NOx compressor kick back valve that had broken stem. W eld repair E-101-A1
12/3/06 12/9/06 Gauze change. Install Tie-Ins For Acid Cooler, Re certification of relief valves, vessel and exchangers inspections, Minor maintenance repairs where necessary & calibration of instrumentation that needed a S/D.
6/8/07 6/22/07 Gauze change. Maintenance overhaul of Air Compressor C-101A, Inspect Steam Turbine, C-101D, Re

certification of relief valves, Vessel and exchangers inspections, Minor maintenance repairs where necessary & calibration of instrumentation that needed a S/D.
12/2/07 12/8/07 Gauze change. Repair W eld Leak On Tank D @ Manway Reinforcement Pad, Nox Compressor W ork C101- B.Re certification of relief valves, Vessel and exchangers inspections, Minor maintenance repairs where necessary

& calibration of instrumentation that needed a S/D. 9/11/08 9/22/08 Hurricane Ike. Minor work and repairs. 11/2/08 11/9/08 Turnaround with inspections. Installed steam and condensate revision project. Re certification of relief valves. Minor maintenance repairs where necessary & calibration of instrumentation that needed a S/D. 11/12/08 11/17/08 Inventory outage. Minor maintenance repairs that were necessary & calibrations of instrumentation. 11/23/08 11/30/08 Inventory outage. Minor maintenance repairs that were necessary , PM's & calibrations of instrumentation. 12/16/08 12/23/08 Inventory outage. Re certification of relief valves, vessel and exchangers inspections, Minor maintenance repairs where necessary & calibration of instrumentation that needed a S/D. 1/1/09 1/5/09 Inventory outage. Minor maintenance repairs where necessary & calibration of instrumentation that needed a S/D. 2/17/09 3/9/09 Turnaround inspection work. Down mainly due to low demand. Minor maintenance repairs where necessary & calibration of instrumentation that needed a S/D. 10/12/2009 10/30/2009 Turnaround inspection work. Maintenance work on exchangers, compressors, computers and other smaller items. Turnaround > 5 days