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IMCO’s excavations in the vicinity of Olympic’s pipeline.

IMCO’s excavations in the vicinity of Olympic’s pipeline. N. Design Phase Activities. Locate Pipeline for Planning Obtain Olympic’s Requirements “Pothole” Pipeline. It is unlikely that the extensive damage to the pipeline occurred as a result of the potholing.

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IMCO’s excavations in the vicinity of Olympic’s pipeline.

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  1. IMCO’s excavations in the vicinity of Olympic’s pipeline.

  2. N

  3. Design Phase Activities • Locate Pipeline for Planning • Obtain Olympic’s Requirements • “Pothole” Pipeline

  4. It is unlikely that the extensive damage to the pipeline occurred as a result of the potholing.

  5. IMCO’s Excavation Activities

  6. Olympic Pipeline Exposed During Water Line Installation 72" Line Location of gouged dents

  7. Gouged Dents Found Near Water Line Crossing

  8. Original Design

  9. Modified Design

  10. New Discharge Line Newly-Installed Discharge Water Line Tee

  11. Thrust Block Tee Rupture

  12. Area of Origin Gouge External Gouges on Ruptured Pipeline

  13. Rupture Damage Shown on Internal Surface

  14. Extent of Damage to Pipe

  15. IMCO’s Excavation Activities • Mechanized Equipment • No Anomalies in 1991 • Water Treatment Plant Project in 1993 and 1994 • Anomalies Detected in 1996 and 1997

  16. Damage to the Olympic pipeline probably occurred during IMCO excavations associated with the water treatment modification project.

  17. New Pump Station Newly-Installed Discharge Water Line New Discharge Line New Discharge Line Tee

  18. Olympic’s Inspections • Olympic Not Notified of Excavations • Barrett Should Have Notified Olympic of Design Change • IMCO Responsible for Notification • Olympic Didn’t Investigate Open Excavation or Check As-built Drawings

  19. Olympic inadequately inspected the excavation work.

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