LFT_FCS_Presentation.potx - nc

Report
Brookfield Avenue Landfill
Closure and Post-Closure Use Project
NC SWANA
2014 Fall Conference
Wrightsville Beach
Martin Sanford, PE
October 14, 2014
Outline
• Project Summary
• Closure Design Components
• End Use Plan
– Public Use
– Ecological restoration
• Lessons Learned
Brookfield Ave Landfill Project
Project Summary
• 132-acre New York City MSW landfill on Staten Island
– Operated from 1966 to 1980
– Classified as Class 2 Inactive Hazardous Waste Disposal Site in 1986
• Existing utility infrastructure on the property
– 48” Interceptor sewer and pump station
– Triple reinforced concrete stormwater culvert
– Water and gas lines
• Project Schedule
– Construction started in 2010
– Project currently in the two year contractor maintenance phase
Brookfield Ave Landfill Project
Richmond Creek
East Cell
Salt Marsh
Wetlands
Pump Station
West Cell
Pre Construction Aerial Photo
Brookfield Ave Landfill Project
Wetlands
Design Summary
• Complexity of final cover, remediation, and wetlands
construction
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Extensive Grading and Shaping
Standard Subtitle D Landfill Cap
Geotechnical Slurry Barrier Wall
Active Gas Collection System and Flare Station
Leachate Collection System
• Extensive Landscaping Improvement
• Wetland Restoration
• Maintain access to existing infrastructure
Brookfield Ave Landfill Project
2010 Aerial after Tree Clearing
Brookfield Ave Landfill Project
Typical Landfill Cap
6”- 36” TOPSOIL LAYER
12” BARRIER PROTECTION LAYER
GEOCOMPOSITE DRAINAGE NET
40 mil LLDPE GEOMEMBRANE
GEOCOMPOSITE DRAINAGE NET
(GAS COLLECTION LAYER)
MIN 12” INTERMEDIATE COVER/
GRADING LAYER
132 Acres of Landfill Cap
NORTH
Landfill Cap
Brookfield Avenue Landfill
Landfill Cap
East Cell
Landfill Cap
West Cell
Legend
Groundwater Barrier Wall
Enclosed Gas Flare
Leachate Collection Trench
Typical slurry barrier wall construction
Wetland Restoration – East Cell Over Cap
Wetland Restoration – Wetlands constructed over cap
Brookfield Ave Landfill Project
End Use Plan – Public Use Park and Recreational
Areas
• Public Use
– “Ecological Restoration”
– Total site 272 Acres
– 15 Acres ACTIVE Recreation – Three Future Multi-Purpose
Sports Fields
– 257 Acres of protection and restoration for PASSIVE recreation
• Park and Recreation Elements
– Access and Parking
– Pedestrian Pathways and Trails
– ADA Considerations
Brookfield Ave Landfill Project
Post Closure “End Use Plan”
Brookfield Ave Landfill Project
NYCDEP End Use Plan – Ecological Restoration
• Ecological Restoration
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Re-introduce Native Plant Materials
Re-introduce Wetland Areas
Restore Salt Marsh
Provide Wildlife Habitat
Minimize Irrigation, Fertilizing and
Herbicides
– Improve Water Quality and Reduce
Future Soil Erosion
Brookfield Ave Landfill Project
2014 Aerial during Maintenance Period
Brookfield Ave Landfill Project
Lessons Learned
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Drainage Flaps
Planting Berms
Swale Crossings
Pipe Crossings
Site Access – Construction and End Use
Protection from Public Access and Deer
Brookfield Ave Landfill Project
Drainage Flaps
Problem:
• Landfill side slopes were flat
• Drainage flaps were long, 100
to 150 feet in some cases.
– Future settlement of the flap
could cause drainage issues.
Solution
• Extended completely under
the road to the embankment
to discharge offsite.
Brookfield Ave Landfill Project
Planting Berms
Design
• 36” topsoil for trees and shrubs
– Mounds built on top of the
landfill cap.
• Problem
– Berms blocked stormwater
sheet flow.
– Caused ponding and erosion.
• Solution
– Erosion gullies filled with filter
fabric and riprap.
– Install small basins and piping.
Brookfield Ave Landfill Project
Swale Crossings
Design
• Pedestrian and bike paths
tied into the perimeter
maintenance road and
concrete swale
Problem
• No mechanism for people or
bike riders to cross the swale
Solution
• Purchase grates, chip out the
concrete, and install grates in
place
Brookfield Ave Landfill Project
Pipe Crossings
Design
• Drop inlets placed at low points
to convey stormwater.
• 15” CPP pipes drained were
installed under road.
Problem
• Clearance for CPP pipe during
active construction.
Solution
• Pipes changed to 12” Ductile
Iron Pipe.
Brookfield Ave Landfill Project
Site Access During Construction and End-Use
• Construction site entrance through
residential areas.
– Concern with daily trucks access
through the neighborhood.
• Public park access
– One access for both vehicles and
pedestrians.
– Additional parking and pedestrian
entrances added.
• Local FDNY input
– 30 foot wide access to the flare.
– Secondary access for emergencies.
Brookfield Ave Landfill Project
Protection from Public Access and Deer
• Leachate collection system with nine pumping chambers.
– Control panel located near pedestrian and bike paths.
– Panels were exposed to tampering by the public.
– Panels placed inside lockable cabinets to prevent park users from
turning the pumps on and off.
• Protection of 17,000 trees and shrubs.
– Deer was observed eating the new plantings, which had to be
replaced.
– 10,000 feet of deer fence added to protect the newly planted
landscaping.
Brookfield Ave Landfill Project
Other Keys to Project Success
• Hauling of 2.4 million tons of soil materials
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Common Fill – 927,000
Protective Cover – 798,000
Wetland Topsoil – 125,000
Topsoil – 554,000
• Stakeholder Engagement
– Citizen Advisory Committee
– State and local government
• Remaining Project Schedule
– Contractor Maintenance Phase
– Park areas scheduled to open in 2017
Brookfield Ave Landfill Project
Thank You!
QUESTIONS?

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