black lagoon site - us epa · 2016-02-20 · black lagoon project costs • total cost...
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Black Lagoon SiteBlack Lagoon Site Trenton, MITrenton, MI
First Great Lakes Legacy ActFirst Great Lakes Legacy Act Sediment CleanSediment Clean--up Projectup Project
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•
Refuge•
McLouth S• A
•
Black Lagoon Site
Approximately 2-acre exposed cove on Trenton Channel of Detroit River
Part of Detroit River Area of Concern & Detroit River International Wildlife
Located immediately downstream of former teel plant (closed in 1995)
cted as settling basin for past 50 years
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• Multiple joint historical
• ver 400,000 cy contaminated sediments in Trenton Channel
Black Lagoon Site Contamination
sampling efforts
• One of six major contaminated areas of Trenton ChannelO
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•
– O– Total PCBs: 1.12 mg/kg– Mercury: 1.40 mg/kg– Lead: 146 mg/kg
Black Lagoon Site Contamination
Site contributed approximately 115,000 cy of contaminated sediments Average contaminant thickness was 8-15 feet Average contaminant concentrations:
il & Grease: 6,280 mg/kg
• •
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Great Lakes Legacy Act of 2002…
Great Lakes sediment remediation toolbox
…a new “tool” in the
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• The Legacy Act authorizes $50M per year from FY2004 through FY2008 for contaminated sediment projects in the Great Lakes
• Funds can be used for clean-ups, research, and public outreach in AOCs
• $10 Million appropriated in FY2004• $22 Million appropriated in FY 2005• Black Lagoon Site submitted by MDEQ
Great Lakes Legacy Act
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– G
–
– D– Grand Haven Area Office– Pointe Mouillee Confined Disposal Facilty
•
Multi-Agency Cooperative Effort
U.S. EPA Region V reat Lakes National Program Office
– Superfund Division (Emergency Response Contract)
Surface Water Quality Section • Michigan Department of Environmental Quality
• US Army Corps of Engineers etroit District & Detroit Area Office
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Multi-Agency Cooperative Effort
• American Heritage River Initiative
• •
Greater Detroit
City of Trenton Private land-owners
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•
Primary Objectives
Reduce risks to human health, wildlife, and aquatic life in Detroit River AOC
Restore the aquatic habitat in Black Lagoon • • Prepare for recreational and economic
redevelopment of Black Lagoon
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•
•• Truck Transport to CDF• Final Sediment Placement at CDF
Black Lagoon Clean-up Plans
Lagoon Isolation/Silt Curtain Installation
• Environmental Controls
Mechanical Dredging• • Barge Transport to Pointe Mouillee CDF
Sediment Solidification at CDF
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•
” x 8”
intervals • F
steel beam support at bottom
Lagoon Isolation/Silt Curtain
Approximately 2,000 ft long and 24 ft deep• Fifty foot sections of laminated vinyl-
• polyester fabric with heat-treated seams
8 x 48” EPS foam block floats • Initially connected to pipe piles at 50 ft
inal connection at 10-15 ft intervals with
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Lagoon Isolation/Silt Curtain
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Lagoon Isolation/Silt Curtain
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H– A– Shoreline – Work Barges
Environmental Controls
• Equipment at Lagoon – arbor Boom
bsorbent Boom
Oil Spill Protection
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1– 2
– C
– Repeat throughout shift
– Continuous feed units
Environmental Controls
• – Station Upstream
Stations Downstream
ollect data 2 hours after start of shift
Turbidity Monitoring
– Handheld readings
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S
CDF– R
and particulates– Biweekly Sampling
for PCBs, Lead and Mercury
Environmental Controls
• Sampling – everal locations at
both Lagoon &
eal-time VOCs
Air Monitoring &
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•
• M• W
Mechanical Dredging
Two work barges with steel hoppers• CAT 235DL excavator with environmental
clamshell for top sediment Long-reach 320L excavator for finer
sediments aterial transferred to transport barges
•
eekly soundings conducted for volume measurements (GPS/total station)
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Mechanical Dredging
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•
•
Barge Transport to Pointe Mouillee Confined Disposal Facility (CDF)
Sediments loaded over silt curtain into transport barges
• Barges hold approximately 1800 cy
• Spill prevention steel plate used for transferTransport barges travel down Detroit River
Channel to CDF in Lake Erie
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Barge Transport to Pointe Mouillee CDF
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•
•• U
and Harbor Act of 1970
Pointe Mouillee CDF
Designed to contain 18 million cy of contaminated dredged sediments from the Detroit and Rouge Rivers
• 700-acre crescent-shape dike in Lake Erie• Structure is 3.5 miles long and 1,400 ft wide
Constructed in sections from 1976 – 1981 SACE authorized to manage under River
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• on
• S
Sediment Solidification at CDF
Sediments solidified with Calciment transport barge at CDF
• Solidified sediments off-loaded into off-road dump trucks
• Silt curtain in place around barges
ediments off-loaded into either temporary storage pit or directly into CDF cell
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Sediment Solidification at CDF
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Sediment Solidification at CDF
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•
•remainder of project
Truck Transport to CDF
Project delays due to increased volume and inclement weather conditions
Transport by barge no longer possible • • Initiated solidification at Lagoon with
transport by truck to CDF
Continued truck transportation for
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Truck Transport to CDF
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•
D– L– S
• I
Other Weather Considerations
Turbidity monitoring in River• Silt curtain inspection and repairs
– iver assisted inspections onger sections of impermeable silt curtain econd layer of permeable silt curtain added
ce management in excavation area
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Winter at the Black Lagoon
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Two Layers of Silt Curtain
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•
•• T• Sediments compacted and graded
Final Sediment Placement at CDF
Cross dike constructed to isolate Black Lagoon sediments
• Outer CDF walls lined with geotextile
• Overflow weir installed to manage oil/waterSolidified sediments placed in 12 inch lifts
wo foot cover material placed on top
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Final Placement at CDF
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Final Sediment Placement at CDF
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• C
• S• C
shoreline restoration
Black Lagoon Site Summary
ooperative Multi-Agency Effort• Dredging occurred over 13 months• Approximately 115,000 cy of contaminated
sediments removed • Excavated area covered with 6 inches of sand and
3 inches of stone and bar area created with stone riprap ity of Trenton received $113,000 grant for
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140,000Zinc
38,000Lead
Oil and Grease
Black Lagoon Contamination • 115,000 cy of contaminated sediment removed
300,000
360Mercury
160PCBs
AMOUNT (in lbs.)CONTAMINANT
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••
Black Lagoon Project Costs• Total cost approximately $9.3 million
$6 million Legacy Act funds $3.3 Clean Michigan Initiative funds
(The Clean Michigan Initiative is a(The Clean Michigan Initiative is a $675 million bond used to clean up,$675 million bond used to clean up,
protect and enhance Michigan’sprotect and enhance Michigan’s environmental quality and naturalenvironmental quality and natural
resources).resources).
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M
– M
– Michelle Jaster (– [email protected]
Black Lagoon Site Contacts
• U.S. EPA Region V GLNPO– arc Tuchman (312) 353-1369
• MDEQ ike Alexander (517) 335-4189
• U.S. EPA Region V Superfund Division734) 692-7683
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Human Error or Equipment Failure?
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The Resulting Multifaceted Response