OLD ROOSEVELT FIELD CONTAMINATED GW AREA
GARDEN CITY, NY
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The Old Roosevelt Field Contaminated Groundwater Area site is located in Garden City, New York. Two Garden City public drinking water supply wells at the site have been found to be contaminated with the chlorinated solvents tetrachloroethene (PCE) and trichloroethene (TCE). The site includes the former Roosevelt Field airfield.
Chlorinated solvents such as TCE and PCE have been widely used for aircraft manufacturing, maintenance and repair operations since the 1930s. The site is now the location of a shopping mall, office buildings, parking areas and Hazelhurst Park. Nassau County conducts regular well sampling and analysis of the public supply wells, and EPA is addressing site cleanup through federal actions. Groundwater treatment and monitoring are ongoing.
What Has Been Done to Clean Up the Site?
In 1987, the Village of Garden City installed an air stripping treatment system to remove volatile organic compounds from the raw water being pumped from the two public supply wells (GW-10 and GW-11). Nassau County conducts regular well sampling and analysis of the public supply wells. EPA is addressing site cleanup through federal actions.
Routine monitoring of groundwater at the site is being performed by EPA as part of a long-term monitoring program to verify remedy effectiveness and to monitor remedial progress. The results from the most recent annual groundwater sampling event performed in November 2015 (Round 7) indicate that TCE and PCE concentrations in Garden City supply wells GWP-10 and GWP-11 decreased by over 50 percent between 2011 and 2015, although they continue to exceed the EPA Maximum Contaminant Level (MCL) and New York State drinking water standard of 5 micrograms/liter for TCE and PCE. Institutional controls are in place to restrict groundwater use at the site
What Is the Current Site Status?
The site is being addressed in three stages: initial actions and two long-term remedial phases focused on cleanup of the entire site
In 1987, an air stripping treatment system was installed on Garden City supply wells GWP-10 and GWP-11 to remove volatile organic compounds from the raw water being pumped from the two contaminated wells. The treatment system was upgraded in 1999. Nassau County conducts regular well sampling and analysis of the public supply wells.
Long-term remedial phases:
A comprehensive remedial investigation (RI) was conducted from June 2005 to December 2006. The primary purpose of the RI was to determine the extent of groundwater contamination and to characterize site geology and hydrogeology. A number of site‐related contaminants were identified in the groundwater during the RI, including TCE, PCE, cis-1,2-dichloroethene (DCE), 1,1-DCE, and carbon tetrachloride. Following the RI, a feasibility study (FS) was completed to evaluate the remedial alternatives to treat the contaminant plume. On September 28, 2007, EPA issued a Record of Decision (ROD) for the site that selected groundwater extraction, ex-situ treatment, and discharge of the treated water to Nassau County recharge basin #124.
As part of the pre-design investigation (PDI), conducted between May 2008 and August 2009, groundwater contamination was detected south of the Garden City supply wells. As a result, EPA initiated a remedial design (RD) and remedial action (RA) to address the groundwater contamination south of the Garden City supply wells.
In September 2009, the RD for the groundwater contamination north of the Garden City supply wells was completed. In accordance with the ROD, the RD included the design of the groundwater extraction and ex situ treatment system to treat the contaminated groundwater and prevent contaminant migration to the Garden City supply wells.
In addition, in 2011, groundwater sampling was completed from existing and from monitoring wells installed as part of the PDI. Groundwater data from the PDI monitoring wells indicated contamination in the eastern portion of the site at the Old Roosevelt Field Mall property. The eastern portion the site was not addressed in the 2007 ROD. As a result, EPA divided the site into two Operable Units (OUs) to address the long‐term cleanup of groundwater contamination at the site. OU1 addresses the northern and southern portions of the contaminated groundwater plume, and OU2 addresses the eastern portion of contaminated groundwater plume. Concurrently, with the on-going activities for OU1, EPA is also addressing the eastern portion of the site (OU2). To date, ten monitoring wells with depths varying between 300-550 feet have been installed and sampled to delineate the eastern plume. . The RI/FS for OU2 is currently on-going.
The Remedial Action (RA) for OU1 was completed in four phases.
Phase 1 and 2 of the RA addressed the northern portion of the groundwater plume. Phase 1 included the installation of three extraction wells in the parking lot south of 400 South Garden City Plaza, the installation of three paired monitoring wells, and aquifer testing. Phase 2 of the RA included the construction of a treatment building in the rear of the Garden City Pumping Station, the installation of yard piping from the three extraction wells to the groundwater treatment building, and the construction of the groundwater treatment system. The Phase 1 and Phase 2 of the RA were completed in September 2010 and December 2011, respectively.
Phases 3 and 4 of the RA addressed the southern portion of the groundwater plume. In June 2013, the RD for the southern plume was completed. Phase 3 RA included the installation of three additional extraction wells at the Garden City property along the south side of Stewart Avenue near Clinton Road. Phase 4 of the RA included the installation of yard piping from the additional three extraction wells to the groundwater treatment system and upgrading the existing treatment system to accommodate the additional groundwater flow of 250 gallons per minute. Phase 3 and Phase 4 of the RA were completed in April 2013 and July 2015, respectively.
On-going activities include operation, maintenance, and monitoring of the treatment system and confirming compliance with discharge requirements for the treated water. Routine monitoring of groundwater monitoring wells at the site are being performed as part of a long-term monitoring program to verify remedy effectiveness and to monitor remedial progress. Institutional controls are in place to restrict groundwater use at the site.