Closure and Post-Closure Use Project
NC SWANA
2014 Fall Conference
Wrightsville Beach
Martin Sanford, PE
October 14, 2014

• Project Summary
• Closure Design Components
• End Use Plan
– Public Use
– Ecological restoration
• Lessons Learned
Brookfield Ave Landfill Project

• 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
Salt Marsh
West Cell
East Cell
Wetlands
Wetlands
Pump Station
Pre Construction Aerial Photo
Brookfield Ave Landfill Project

• Complexity of final cover, remediation, and wetlands construction
– 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
132 Acres of 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

NORTH
Landfill Cap
Brookfield Avenue Landfill
Landfill Cap
East Cell
Landfill Cap
West Cell
Enclosed Gas Flare
Legend
Groundwater Barrier Wall
Leachate Collection Trench

Typical slurry barrier wall construction

• Wetland Restoration – Wetlands constructed over cap
Brookfield Ave Landfill Project

• 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

• Ecological Restoration
– 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

• Drainage Flaps
• Planting Berms
• Swale Crossings
• Pipe Crossings
• Site Access – Construction and End Use
• Protection from Public Access and Deer
Brookfield Ave Landfill Project

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

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

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

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

• 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

• 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

• Hauling of 2.4 million tons of soil materials
– 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!