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THE CITY OF WHITE PLAINS
DEPARTMENT OF PUBLIC WORKS
PUBLIC MEETING
NOTICE JUNE 9, 2011
7:00 PM – 9:00 PM WHITE PLAINS
PERFORMING ARTS CENTER (ACROSS FROM
CITY HALL) 11 CITY PLACE, 3RD
FLOOR WHITE PLAINS, NY 10601
THE CITY OF WHITE
PLAINS AND ITS ENVIRONMENTAL
CONSULTANT WILL HOLD A PUBLIC
MEETING TO PRESENT AND RESPOND TO
QUESTIONS ABOUT A LANDFILL CLOSURE
PLAN FOR THE FORMER GEDNEY WAY LANDFILL SITE. REPRESENTATIVES
OF NEW YORK STATE DEPARTMENT OF
CONSERVATION AND NEW YORK STATE DEPARTMENT OF
HEALTH WILL ALSO BE PRESENT. SITE
INVESTIGATION DATA AND LANDFILL
CLOSURE PLAN ARE SUMMARIZED IN THIS
FACT SHEET.
Gedney Way Landfill Closure
City of White PlainsWhite Plains, NY
Public Announcement
Public Information Session June 9, 2011 for Landfill Closure Plan for Gedney Way Landfill
The City of White Plains (the City), under direction of The New York State Department of Environmental Conservation (NYSDEC), has developed and will soon begin implementation of a Landfill Closure Plan for remediating the environmental impacts associated with the former Gedney Way landfill (the Site) and covering the site with an appropriate landfill cap. On June 9, 2011, at 7:00 pm, an information session will be offered where the City’s consultant will review the Landfill Closure Plan, and the public can ask the NYSDEC, the New York State Department of Health (NYSDOH), the City of White Plains, and its consultants questions about the project, and provide input related to the Closure Plan. The information session will be held at the White Plains Performing Arts Center (3rd Floor) in White Plains, New York.
Background:
The City was reported to have initiated disposal of residual ash from the City-operated municipal solid waste incinerator at the Site in 1948. A figure showing the Site and the landfill boundary is attached for reference. At various times during the disposal history, municipal solid waste, construction and demolition (C&D) debris, and other miscellaneous wastes were deposited at the site, although it was primarily used for the disposal of ash fill. Waste disposal at the facility was reported to have ceased in 1979. City reports indicated the facility was converted to a leaf storage and processing facility in 1980. On July 21, 1978, the NYSDEC issued a sanitary landfill permit to the City, which allowed the facility to accept “household bulk waste, tree trimmings and leaves” on an existing incinerator residue landfill. The permit was renewed in 1981 and the renewal included a requirement for the City to submit to the NYSDEC an acceptable landfill closure plan six months prior to ceasing waste acceptance activities. The City subsequently placed a soil cap over the footprint of the landfill. Since disposal operations were ceased in 1979, the facility has been used to process leaves, yard waste, stumps and brush generated within City limits. The facility has also been used for storage of materials, including guard rails, curbing, gravel, highway barriers, drain pipes and snow plows and spreaders to support Department of Public Works (DPW) operations. Subsurface Investigation: Investigations completed in conjunction with the NYSDEC were initiated in 1986 and documented an area of solvent-contaminated soil in the southern end of the landfill area and four drum disposal areas adjacent to the stream bank along the southeastern side of the facility. The City’s consultant AKRF, and environmental consulting firm, completed an extensive investigation to confirm the status of the historical areas of concern, to determine if contamination exists anywhere else on the property, and to document landfill conditions in order to complete the necessary closure requirements.
For more information about the Gedney Way site,
contact: Joseph Nicoletti
City of White Plains Department of Public
Works Municipal Building,
225 Main Street, White Plains, NY 10601
914-422-1206 [email protected]
Additional questions about the Gedney Way site may be
directed to:
Mr. Martin Brand NYSDEC
Division of Materials Management
Region 3 Office 21 South Putt Corners
Road New Paltz NY 12561
845-256-3123 [email protected]
Ms. Kristin Kulow
NYSDOH Bureau of Environmental
Exposure Investigation 28 Hill Street, Suite 201
Oneonta, NY 13820 (607)-432-3911
Press inquiries may be made to the appropriate
offices of the City of White Plains
The investigation determined that solvent contamination in soil from the historical release was below the State’s most stringent clean-up criteria for unrestricted use. Solvent contamination found in one drum disposal area was excavated and removed from the site. Low-level PCB, pesticide, and metals contamination found in a second drum disposal area was of the type and concentration normally associated with municipal solid waste and will be placed beneath the landfill cap.
Solvent contamination in groundwater was found to extend from the historical release area to the southern property boundary where concentrations of trichloroethene, 1,1-dichloroethane, cis-1,2 dichloroethene, and vinyl chloride have been detected at concentrations that exceed the applicable ground quality standards. Similar solvent-related contaminants were also detected in the southern stormwater line that runs through the landfill at concentrations that exceed the applicable water quality standards. An off-site investigation indicated groundwater quality beyond the southern property boundary met the applicable water quality standards for solvent compounds. Landfill perimeter sampling of groundwater indicated a pattern of groundwater contamination including elevated concentrations of typical leachate indicators such as ammonia, alkalinity, hardness, total dissolved solids, manganese and iron, which are typical for unlined municipal solid waste landfills. Other inorganic parameters exceeding applicable standards in one or more downgradient monitoring point included boron, lead, sulfate and nitrate. Sediment and surface water sampling documented that the solvent plume was not significantly impacting the adjacent stream, and that there were no hot spots for landfill leachate parameters. Elevated concentrations of iron were present in the iron floc deposits occurring in areas where leachate-impacted groundwater discharges to the stream, and dissolved concentrations of iron in surface water exceeded the surface water standard for NYSDEC Class C streams. Stormwater sampling indicated that leachate-impacted groundwater was infiltrating two stormwater lines and stormwater manholes beneath the site.
The investigation determined that methane existed at concentrations above 100% of the lower explosive limit (LEL) in the central and southern portions of the landfill. Soil borings and test pits in the landfill area indicate that the subsurface materials contain a high volume of organic material, ash, and C&D debris. Soil gas points around the perimeter of the landfill indicated that methane production is localized within the landfill area. Elevated solvent compounds were detected on the Gedney Way property in subsurface soil vapor at sampling locations located on the southern end of the site. These subsurface locations were overlying the area where solvent compounds were detected in groundwater. Soil vapor samples were collected from below the foundation floor at five houses adjacent to the southern property boundary for Gedney Way. Indoor air samples were also collected at each of the five residents. The soil vapor and indoor air sampling indicated that soil vapor intrusion is not occurring.
Investigation data documented that the edge of ash fill follows the facility’s eastern property boundary from Gedney Way to the Our Lady of Sorrows (OLS) property, extends onto the OLS property to approximately 40 to 45 feet east of the baseball field, continues along the eastern Gedney Way boundary near Gedney Circle, follows the edge of the slope near the stream bank to the southeast, the edge of the slope to the south, and the railroad bed on the west side of the site. The extent of waste fill material is depicted on the attached figure.
Landfill Closure Plan Key Requirements:
The goals of landfill closure include utilization of a landfill cap to prevent direct contact with the fill material, minimize water infiltration and leachate generation, prevent degradation of groundwater and surface water, eliminate preferential
For a complete summary of the investigation and landfill closure plan, please attend the information session,
which will be held on June 9, 2011 at 7:00 pm at the White
Plains Performing Arts Center (3rd Floor) in White
Plains, New York.
pathways for contaminant migration through storm drains, and provide for management of methane gas production. A secondary goal of the closure plan is to allow the continuation of activities that are vital to the City’s DPW operations in a manner which does not adversely affect the effectiveness of landfill closure. These activities include leaf removal and storage, composting, storage of snow plows, salt spreaders, curbing, and other items needed for road improvements. The closure plan requirements include:
! Closure of the southern end of the landfill with a geosynthetic cover system based on a Part 360 design approach, which includes a vegetative cover, topsoil layer, barrier protection layer, barrier layer and gas venting.
! Closure of the remaining landfill area with a minimum of two feet of clean soil cover.
! Soil outside of the modified Part 360 capped area will include a surface asphalt layer, but gas venting will be required for asphalt sections overlying areas where methane gas is present.
! Install liners in the two northernmost stormwater lines and seal manholes and eliminate preferential pathways at termination points of each stormwater line.
! Install liners in the two northernmost stormwater lines similar to the re-lining and sealing of the southernmost stormwater line, which was completed in Spring 2006. Evaluate and implement measures to seal manholes and eliminate preferential pathways at termination points of each stormwater line.
In addition to the landfill cap design and layout, the Landfill Closure Plan includes measures to provide erosion control during cap construction, establishes handling requirements for moving landfill material, includes contingencies to address buried drums, hazardous wastes or solvent-contaminated soil if discovered during the closure work, and specifies the air monitoring procedures along the perimeter of the site and in the work zone to ensure that the surrounding community and workers are protected during landfill closure.
After the landfill is closed, a Post-Closure Monitoring and Maintenance Plan will be implemented to provide the information needed to effectively monitor and maintain the facility during and after a 30-year post-closure period. The plan will include a description of all environmental control systems and set guidelines, procedures, and frequency to conduct inspections, maintenance, and groundwater and soil gas monitoring. The closure plan measures will also isolate the solvent contamination source area and most of the groundwater plume beneath the landfill cap and serve as the remediation measure for the plume in conjunction with monitored natural attenuation. The post-closure groundwater sampling will be used to monitor the effectiveness of the landfill cap and the natural attenuation process to remediate the groundwater plume.
Construction Phases:
The anticipated landfill closure construction schedule has been phased to address the OLS school schedule, the fall leaf collection requirements for the City, and general Public Works activities conducted at the site. Construction is anticipated to be initiated in July 2011, and will commence at the OLS School in order to complete the cap installation prior to the start of the 2011/2012 school year. The second phase is anticipated to include grading in the southern portion of the site and installation of the Part 360 cap to allow time for the vegetative cover to be established during the growing season. This will allow the existing composting area to remain in operation during the fall leaf removal. The third phase will include closure of the remaining landfill areas outside of the Part 360 area. The project is expected to take approximately 6 months to complete.
