Dredged Material Beneficial UsesAlafia Banks, Whiskey Stump Key and McKay Bay Dredge Holes

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Dredged Material Beneficial Uses/Alafia Banks,
Whiskey Stump Key and McKay Bay Dredge Holes

• August 12, 2004
• Presentation to ABM

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Tampa Bay Dredge Hole Assessment Project
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(No Transcript)
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Conclusions
WORST DREDGE HOLE McKAY BAY (hypoxia, sediment
contaminants, degraded benthos, degraded fish
community)
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Spearman Rank Corr. 0.583, P 0.0992
Based on FIM Index 1 (minus seine data) and
approx. mean TBBI from spring and fall Source
FWC FWRI Fisheries Independent Monitoring Program
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US Army Corps of Engineers Alafia River Turning
Basin dredging area
Alafia Banks enhancement beneficial use project
to stabilize erosion and enlarge intertidal
habitat
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Alafia Banks one of the most important and
diverse wading bird rookery in the Southeastern
US
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ACOE and FDEP Requirements

• ACOE For economic viability, place at least
  700,000 cubic yards of material - Alafia Banks
  can take 450,000 cy
• FDEP For permitting the Alafia Banks project,
  shallow-up 20 acres of bay bottom by filling
  artificial hole

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ACOE project Fill one or both Whiskey Stump Key
holes Recommend-ations from July 8, 2004
Dredge Hole Assessment Advisory Group meeting Do
not fill Whiskey Stump Key holes, due to existing
habitat value
Whiskey Stump Key holes West and East
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Dredge Hole Assessment Advisory Group
Recommendations July 8, 2004

• Recommend that the US ACOE strongly consider the
  feasibility of using the McKay Bay Dredge hole
  for placement of beneficial use material from the
  Alafia River project.

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Dredge Hole Assessment Advisory Group
Recommendations July 8, 2004

• Recommend that beneficial uses of material from
  the Alafia River project be prioritized as
  follows
• 1. Alafia Banks enhancement
• 2. McKay Bay Dredge Hole

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McKay Bay dredge hole
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Site 2
Site 3

• Sediment Contamination Action Plan Sites
• Palm River/McKay Bay
• Ybor Channel
• West Davis Island
• East Bay
• As recommended by TBEP Sediment Quality
  Assessment Group
• July 2004

Site 1
Site 4
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US ACOE obstacles for use of the McKay Bay hole
for Alafia River Project material

• Very fast time table
• Permitting (FDEP and NEPA)
• Funds to make up the difference in transporting
  material to McKay Bay vs. Whiskey Stump Keys

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Hillsborough County PRF 75,000TBEP 25,000
(staff request)

• PROJECT OBJECTIVE
• Restore McKay Bay dredge hole by capping with
  cleaner dredged material from the Alafia River
  ACOE project, by supporting the transport of
  clean dredged material to McKay Bay
• BENEFITS
• Restoration of polluted area (PRF priority)
• Cost-effective method (ACOE is primary funder)
• Supports Tampa Bay sediment quality goals
• Supports approved Dredged Material Management
  Plan
• Supports enhancement of bird rookery at Alafia
  Banks