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BA-125 Northwest Turtle Bay Marsh Creation

BA-125 Northwest Turtle Bay Marsh Creation

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BA-125 Northwest Turtle Bay Marsh Creation

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  1. BA-125Northwest Turtle Bay Marsh Creation Industry Day May 6, 2014

  2. 760 Acres

  3. FILL SITE DESIGNConstruction Methodology • Semi-confined placement • Pipe will be moved frequently • No dewatering structures • Marsh will be at different elevations • Previous projects show marsh that is sustainable with this construction method.

  4. FILL SITE DESIGNContainment Design • Traditional earthen dikes for locations shallower than -3.0’ where no pipelines exist. • Sheet pile supported with earth fill for locations where mud line elevation is -3.0’ or deeper • Hay bale blocks in locations shallower than -2.0’ where pipelines exist.

  5. FILL SITE DESIGNContainment Design • Interior Containment • Prevent dredge material from entering oil and gas canals • Allow higher elevations at the center of the project • 5’ crown width • +3.5’ elevation • 3:1 ss • 33,730 lf • 63,600 cy

  6. FILL SITE DESIGNContainment Design Earthen Closure: • 5’ top width • +2.5’ elevation • 2:1 side slopes • 25’ berm • -10.0’ borrow pit • 13 closure locations • 1,048 lf • 3,938 cy

  7. FILL SITE DESIGNContainment Design Sheet Pile Closure: Sheet Pile: Earthen Support: • 2 locations • 192 lf • 3,386 cy • 5’ top width • +2.0’ elevation • 4:1 side slopes • 25’ berm • -10.0’ borrow pit • PZ-22 steel sheet • +4.0’ top elevation • 35’ long sheets

  8. FILL SITE DESIGNContainment Design Hay Bale Closures: • 2 locations • 240 lf

  9. FILL SITE DESIGNMarsh Creation • 12 Fill Locations • Max elevation at each location • Not to exceed cubic yardage at each location

  10. FILL SITE DESIGNMarsh Creation • Potential Pipeline layout • Initial conversations have begun with pipeline companies • Crossing of pipelines will be minimized

  11. FILL SITE DESIGNMarsh Fill Settlement Analysis

  12. FILL SITE DESIGNVolumes • Fill elevation selected is AVERAGE and is used only to calculate a volume. • Elevation will not be a uniform +2.5’. High spots at discharge locations and low spots near the marsh edge are expected. • Estimated Volume: 3.0–3.7 MCY

  13. PROJECT SCHEDULE • 30% Design: March 2014 • 95% Design: October 2014 • Phase 2 Funding: December 2014

  14. Questions?

  15. Boring Locations

  16. Magnetometer Survey • 23 Unknown or Abandoned Pipelines (2” – 4” flowlines) • 9 Identified Pipelines • 5 Active • 12” and 16” Active Gulf South Pipelines Most Significant • 6 Wells • 2 Plugged & Abandoned

  17. Expansion Area 1 135 acres 61% water 39% marsh 262,000 yd3 ONE discharge location

  18. Expansion Area 1 Containment dikes