Astoria Generating Station Gunderboom MLES™

1. Astoria Generating Station Gunderboom MLES™ Station Test Start-Up, Commissioning Status, Analysis and Recommended Actions

2. Presentation Overview • Purpose • For US PowerGen understanding and decision-making; Provide overview of initial startup of the Gunderboom MLES, identifying issues and actions to address issues, complete commissioning and set up for successful and economic operation during the one-year test period.

3. Presentation Overview • Presentation Outline • Overall System Status – • Startup Timeline • Water Level Trending • Commissioning Status and Actions • Overall System Status • Gunderboom Components Status • Activities Forward • Proposed Responsibilities • Specific Actions • Phase VIII – O&M • Station Test Actions Items

4. Overall System Status • Start-Up Timeline • February 2-3 • Start-up slot diffuser test • Pump auto-shutoff with option for auto-restart completed • All solenoid valves checked and one found to not be operating; resolved by tightening wire connection in cabinet on dock • Pump shutoff tested for 5-ft. differential and confirmed • GB set up a trending screen concept that showed multiple monitored parameters for interpreting system function and interrelationships • Determined lack of flow at cartridges due to stop log leaks; stop log leaks identified as significant and to be subject to study and troubleshooting by Reliant.

5. Overall System Status • Start-Up Timeline • February 2-7 • Successful MLES test operation • Cartridge flow graphs show successful flow:

6. Overall System Status • Start-Up Timeline • February 8-13 • Stop log repair and testing • February 14 - 16 • Initial operations after stop log repair • Questionable patterns addressed in studies, data evaluation and meetings • Pump failure 2/16, approx. 10pm. • February 17 - present • Addressing pump problem and evaluating data, especially 2/14 – 2/16

7. Water Levels and Differential – Startup Week Water levels match to startup. Red shows differential increase to 3 – 4 ft. Note river and containment levels lower during tides on 2/5.

8. Water Levels and Differential –Following Repair Differentials shut pump at 5 ft. Occasional negative data spikes. Containment level reading (gray) failures occur with circuit fuse bowing or low containment water level on 2/15 and 2/16 causing differential reading failure.

9. Commissioning Status, Actions • Overall System • Intake Bay • Pumping System • Support Components • Gunderboom MLES Components • Cartridges • AirBurst Control System • AirBurst System Air Supply • Instrumentation • Operation

10. Overall System – 1 • Intake Bay • Stop Logs • Leaking prevented head buildup and proper flow. Repair modified operating conditions. Highly important to have minimum leakage and know what it is. • Elevations • Need thorough knowledge and understanding to determine delay timing, elevation of stilling well, sump capacity and other factors. • Pumping System • Pump • Apparent successful operation until failure. Flow rate varies with tide level (not optimal for Station Test). Failure analysis and repair critical to MLES test. • Pump Shutoff • At low sump level or at transmitter compromise, important fail-safe mechanism should be incorporated. • Pumping Flow Data • Only manual gauge at present. Very advantageous to operation and test interpretation to have recorded in SCADA.

11. Overall System - 2 • Support Components • Electrical System • Problematic, apparent residual issues seen in fuse problem, pulses seen on monitoring screen, data spiking. • Containment level sensor stilling well • Containment stilling well may not be deep enough. May require moving it farther down in the water column or changeout to longer pipe with possible change of sensor to accommodate greater length. Need info.

12. Gunderboom Component Status - 1 • Cartridges • Flow • Patterns of flow changed 2/14 – 2/16 such that cartridge 1 and 4 flow dropped off. Suspect cleaning not as effective on end cartridge faces. Important note for cartridge inspection and analysis. • AirBurst Control System • Check/Verify Parameters • Set points, triggers, alarms, delays; specifics of AirBurst cycles. • AirBurst System Air Supply • Compressor • Mechanical – warranty repair. Otherwise operating as designed.

13. Gunderboom Component Status - 2 • Instrumentation • Reading Losses • Fuse blowing, sensor reading spikes, erratic screen display – probable cause considered to be electrical pulses from wiring. Pump wiring implicated. • Pressure Transducer • Damaged during installation. Replacement backordered. • TSS Meter • Possible drift; investigate. Recommend install second one already in possession with ability to raise, lower, clean and inspect manually. • Operation • Cartridge Flow • Variations in cartridge flow, cleaning effectiveness – need to be analyzed and possible adjustments made.

14. Activities Forward • Overall System • Complete system repairs – stop logs, pump, electrical • Determine elevations, pumping rate vs. sump capacity, modify containment stilling well/level sensor • Determine approach and add pump shut-off safety • Consider, install pump flow meter and data recording • Study and evaluate actual water levels vs predicted tides. • Gunderboom System Components • Conduct cartridge flow and cleaning analysis • Complete commissioning activities and set setpoints • Assess and recommend TSS meter actions if required • Recommend installation of Remote Access to monitor closely, analyze trends, make adjustments, alert plant to actions needed and lower overall cost for Station Test operation

15. Gunderboom Role on the Makeup Water Intake Project • Cartridge and Cartridge Array Design and Fabrication • Control System Design and Implementation • Onsite representation during the installation of cartridges and MLES control system • Add-On- Programming to provide for pump shutdown plus onsite modifications • Did not include intake structure, sump or pump

16. Proposed Responsibilities For Completion of Repairs, Startup and Commissioning • B. Riedel as onsite coordinator for all system activities • Gunderboom conduct data analyses and work with B. Riedel to develop recommendations and costs • B. Riedel and Gunderboom complete commissioning • AGS assign personnel for training in daily system inspections and for troubleshooting with Gunderboom direction and guidance After system operation has stabilized and B. Riedel is no longer on site: • Gunderboom monitor briefly each day, conduct brief trend analyses, make adjustments and prepare brief weekly system status reports, draft monthly summary report. • AGS Daily routine checks during rounding and available to follow up is remote monitoring identifies • Gunderboom technicians; monthly site visits. Inspections and testing. • USPG with WGI / ENSR review data and reports and provide additional evaluation and direction as appropriate

17. Specific Actions

18. Phase VIII – O&M

19. Phase VIII – O&M

20. Station Test Action Items • Before Pump Re-Installation • Replace Pressure Sensor • Inspect Cartridges • Address Containment Level Sensor • Programming Modifications for Pump Shut-off • Verify Specific Slot Cleaning Patterns • Plan for Remote Access • After Pump Re-Installation • Run Full Tests on Pump Level Controls • Verify Stop Log Seal • Check for Electrical Spiking During Pump Operations • Complete Commissioning • Cleaning Parameters • Flow Patterns • Relationship of Cleaning to Head

21. Station Test Action Items • After Commissioning • Define Details of Operations and Adjustments • O&M Guide and Training AGS Ops Personnel • Implement Remote Access • Monitor, Adjust, Troubleshoot, Interpret