GREAT NECK, NEW YORK
As a result of historical operations, there are contaminants present at the site in the groundwater, soil, sediments and soil vapor.
- Part of the original manufacturing operations at the Unisys site, a series of dry wells were constructed at the southeast corner of the main building for the disposal of liquid wastes.
- The dry wells have been identified as the source and primary entry point for most of the subsurface contamination associated with the Site, when the property was owned and operated by Sperry.
- Environmental contaminants of concern are present at the site in the groundwater, soil, soil vapor and sediments, and in groundwater off-site.
- Between 1978 and 2012 a series of studies identified the nature and extent of these contaminants. A number of actions have been taken to address these findings.
- An area of contaminated groundwater, known as a plume, originates at the site and spreads out under approximately 900 acres, extending north/northwest from the site.
- The plume lies between 100 and 400 feet below the surface of the ground and has affected some public water supply wells of the Water Authority of Great Neck North and Manhasset-Lakeville Water District and golf course irrigation wells such as the Village of Lake Success golf course.
- Treatment systems are in place on the impacted public water supply and irrigation wells, and the water they supply meets standards appropriate for their use.
- The primary contaminants of concern in the groundwater are trichloroethene (TCE);tetrachloroethene (PCE); 1,2-dichloroethene (1,2- DCE) and Freon 113. These chemicals are typically used as cleaning solvents.
- The contaminants in the soil and sediments include metals, principally copper, barium and cadmium, and semi-volatile organic compounds (SVOCs), principally polycyclic aromatic hydrocarbons (PAHs).
- The contaminated soil is located in defined areas on the property.
- In a May 1991 Consent Order, the New York State Department of Environmental Conservation (NYSDEC) designated the former Unisys site as a Class 2 Site on the Inactive Hazardous
Waste Disposal list. The Consent Order outlined remediation goals for on- and off-site cleanup.
- The NYSDEC subsequently issued the OU-1 Record of Decision in early 1997 and an amendment in early 2015 that specify the details of construction, operation, maintenance and monitoring of the cleanup of groundwater, soil and soil vapor and sediments on-site.
- Additionally, the NYSDEC issued a Record of Decision for the off-site groundwater cleanup (OU2) in December 2014. The
Records of Decision respond to cleanup alternatives presented
by Lockheed Martin following its extensive investigations
and ongoing cleanup actions to address the contaminants.
- During the course of its investigations Lockheed Martin coordinated with NYSDEC, which discussed all of the alternatives and their ramifications with the citizens of the
area surrounding the former Unisys site, and collaborated with local government officials and water purveyors.
GROUNDWATER CLEAN UP
Environmental investigation and cleanup activities have been divided into two separate areas: cleanup at the Marcus Avenue site and cleanup of contaminants that moved off the site.
- In April 1993 Unisys installed an interim groundwater treatment system (Operating Unit-1, OU-1) to begin removing volatile organic compounds from the on-site groundwater at the
94-acre site’s northern boundary and to contain the movement of the plume.
- The 1997 Record of Decision (ROD) issued by the NYSDEC directed installation of a state-of-the-art groundwater treatment system to replace the interim system.
- Lockheed Martin installed this system in 2001-2 and it began operation in August 2002.
- A separate Record of Decision for off-site groundwater, released by the NYSDEC in late 2014, approved Lockheed Martin’s proposal to upgrade the capacity of OU-1 from 730 gallons per minute to 850 gallons per minute by adding an additional deeper well for extracting groundwater from the plume for treatment.
- To clean up the contaminated groundwater that had already moved off site, Lockheed Martin constructed a second interim off-site groundwater treatment system (Operating Unit-2, OU-2) in June 2004 just south of the Great Neck South school property at a former water supply treatment facility.
- The Record of Decision issued by the NYSDEC in late 2014 approved Lockheed Martin’s proposal to continue operating OU-2 at its present rate of 500 gallons per minute.
- It also approved Lockheed Martin’s plan to provide funding to protect the public water supply in the wider area, working with the two water providers, Manhassett-Lakeville Water Authority
and Water Authority of Great Neck North.
- This plan guarantees the distribution of potable water of highest quality to local citizens with treatment systems on wells affected by site-related contamination, including continued operation of
all existing systems and installation of additional treatment systems or upgrades to existing systems as necessary.
- Monitoring well sampling and laboratory analysis will continue to track movement of groundwater contaminants. Samples from these wells provide early warning of the need to add or
adjust wellhead treatment systems.
- Since the two operating units, OU-1 and OU-2, have begun working, more than 55,000 pounds of volatile organic compounds have been removed from the on-site property and the groundwater plume.
- The two units have prevented further migration of the plume and captured groundwater from those areas with the highest contaminant concentrations.
- For more information view the Great Neck Fact Sheet Summer 2016.
ON-SITE SOIL AND SEDIMENT CLEAN-UP
The on-site environmental cleanup that began in the 1990s in accordance with the 1997 NYSDEC Record of Decision is largely completed and in a maintenance and operations mode.
The work included removing contaminated soil and sludge from three on-site dry wells, installing a permanent on-site groundwater pump and treat system,installing a soil vapor extraction area in the former dry well area,creating an environmental easement that protects human health by limiting access and use of certain areas through deed restrictions and physical barriers.
- In January 1994 an interim soil vapor extraction system was installed on-site near the original disposal area to remove any leftover volatile organic compounds from the soil.
- Responding to the 1997 Record of Decision issued by the NYSDEC, this system was expanded to remove contaminants from soil and from water perched in the soil above the groundwater aquifer outside the southeast corner of the main building.
- In 1998 the effort to remove leftover volatile organic compounds was expanded by excavating down to 30 feet around the three dry wells. Approximately 800 tons of contaminated soil was removed and disposed of off-site at an approved disposal facility.
- The excavation was backfilled with certified clean sand, which largely completes soil requirements for the site by the NYSDEC.
- Remaining areas of soil contamination are being investigated and will either be removed or managed with an environmental
- During the course of its investigations Lockheed Martin discovered contaminants at the bottom of three stormwater basins located at the southwest corner of the site.
- The contaminants resulted from stormwater runoff from site parking lots, roads and building roofs and are confined to the sediment.
- Lockheed Martin proposed, and the NYSDEC in its 1997 Record of Decision accepted, that public health would be served best
by simply limiting access to these basins.
- An environmental easement is now in place requiring that these basin sediments not be disturbed and that the basins continue to be used for stormwater management.
- Deed restrictions have been recorded, a fence was constructed and is maintained around the basins and warning signs to restrict access are posted at the basins and on the fence.
ON-SITE SOIL VAPOR
- In 2006 the New York State Department of Health (NYSDOH) released guidance on vapor intrusion. (Vapor intrusion, or soil vapor intrusion, refers to chemicals in soil that move as a gas or vapor through the soil and into a building.)
- Responding to this guidance, Lockheed Martin investigated
whether or not chemical vapors were present at the site. While samples taken in 2007 revealed no indoor air concentrations in the site buildings above the state guidelines, samples taken in
2008 identified two areas in the main building that did not meet state guidelines.
- Consequently, Lockheed Martin installed two temporary sub-slab depressurization systems (SSDS) in order to quickly
improve indoor air quality in these locations.
- Sub-slab depressurization systems use a vacuum to collect soil vapor below the foundation of a building, treat it and move the cleaned air to the outside of the building
- Lockheed Martin informed building management of the situation and worked closely with tenants and the property owner to
install the sub-slab depressurization systems.
- Lockheed Martin subsequently constructed and began operating a new building-wide sub-slab depressurization system in 2013. The system is continuously operated and monitored to ensure
that a vacuum is constantly maintained under the building.
- The New York State Department of Health concurs that the sub-slab depressurization system protects human health.
- Lockheed Martin will continue to advise tenants and the property
owner on the sub-slab depressurization system performance.
- For more information see the Site-Wide Indoor Air Quality & Vapor Intrusion Program 2016
- The large business facility at 1111 Marcus Avenue in Great Neck, N.Y., has been home to a succession of prominent businesses and activities since the early 1940s.
- The site straddles the border between the Village of Lake Success and the Town of North Hempstead, NY. and comprises approximately 94 acres.
- It includes one main building and several smaller buildings to the south of the main building.
- For more information see the Timeline below.
1941 - The U.S. government built the facility
1947 to 1952 - The property served as the United Nations
1951 -Sperry Gyroscope bought the business and property.
1978 - 2012 - A series of studies identified the nature and extent of contamination.
1986 - Sperry merged with the Burroughs Corporation to become Unisys Corporation.
1991 - NYSDEC issued a Consent Order, and designated the former Unisys site as a Class 2 Site on the Inactive Hazardous Waste Disposal list.
1993 - Unisys installed an interim groundwater treatment system
1994 - An interim soil vapor extraction system was installed on-site
1995 - Loral Corporation acquired the assets of Unisys Defense Systems.
1996 - Lockheed Martin purchased the electronics and systems integration businesses of Loral, and in turn inherited the responsibility for the ongoing environmental cleanup of the site.
1997- The NYSDEC issued the OU-1 Record of Decision
1998 - After its purchase Lockheed Martin discontinued operations at the site.
2000 - Lockheed Martin sold the property.The site is owned by Apollo Lake Success Property LLC and 1111 Marcus Avenue Unit 2 Owners, LLC.
2002 - Installation of a state-of-the-art groundwater treatment system to replace the interim system.
2004 - Lockheed Martin constructed a second interim off-site groundwater treatment system
2005 -The NYSDEC issued the OU-1 Record of Decision amendment
2007 - Lockheed Martin investigates indoor air quality and sub-slab soil vapor conditions.
2008 - Two temporary sub-slab depressurization systems were installed under the main building on the property.
2014 - NYSDEC issued a Record of Decision for the off-site groundwater cleanup (OU2).
2015 - An Amended Record of Decision (AROD) for the Unisys Corporation Site has been issued by the NYSDEC.
2015 - Record of Decision (ROD) has been issued describing the remedy selected for Operable Unit 02
2016 - Lockheed Martin remains responsible for the environmental cleanup.
Remediation documents about this project are also available in public repositories at:
Hillside Public Library
155 Lakeville Road
New Hyde Park, NY 11040
Great Neck Public Library
159 Bayview Avenue
Great Neck, NY 11023