Industry Day May 6, 2014. 760 Acres Semi-confined placement Pipe will be moved frequently No dewatering structures Marsh will be at different elevations.

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Presentation transcript:

Industry Day May 6, 2014

760 Acres

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.

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.

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

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

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

Hay Bale Closures: 2 locations 240 lf

12 Fill Locations Max elevation at each location Not to exceed cubic yardage at each location

Potential Pipeline layout Initial conversations have begun with pipeline companies Crossing of pipelines will be minimized

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

30% Design: March % Design: October 2014 Phase 2 Funding: December 2014

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

Expansion Area acres 61% water 39% marsh 262,000 yd 3 ONE discharge location

Expansion Area 1 Containment dikes