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Site 6A - Fuel Calibration Area

Site Description: Site 6A – Fuel Calibration Area was first identified in the 1986 IAS. Site 6A is located in the south central portion of the facility within Parcel B1. The Fuel Calibration Area consists of a new and old fuel calibration pad. The old fuel calibration pad was located in what is now an open grass-covered field. The old fuel calibration pad was abandoned in 1982. The new fuel calibration pad is located to the northeast of the old fuel calibration pad and consisted of above ground fuel storage tanks and pumps on a concrete apron. The new fuel calibration pad was active until 1996.

Site History: The fuel calibration and related facilities were used in the testing of aircraft fuel and engine systems. Aircraft fuel delivery systems were pressurized with fuel in the calibration area to test for leaks. The testing may have resulted in frequent, small fuel spills to the area’s pavement. The concrete apron between the two fuel calibration pads was also used for the same activity. A shed, piping, and fuel filtering devices were located in the area in the 1980s. The equipment has since been removed. Former Underground Storage Tank (UST) for fuel was located at the old fuel calibration pad (south of Building 231), but was removed in the early 1990s by NGC. An underground waste oil tank and motor oil tank, and transformer were also present in this area and were likely removed in the early 1990s.

Environmental Investigations/Interim Actions: The primary environmental concern at the Old Fuel Calibration Area was the spillage of aircraft fuels. According to the 1986 IAS, as many as 230 gallons of fuel are recorded to have been spilled in these areas. The majority of the spillage was concentrated in the areas surrounding the old fuel calibration pad. Minor maintenance and repairs to the fuel and engine systems were also conducted at the site, and solvents were used during these activities and were likely spilled during their use. Between 1987 and 1992, the underground storage tanks at the site were removed and a mechanical free product recovery system was constructed and operated. Approximately 1,900 gallons of fuel related product were removed.

In 1992, a Site Investigation (SI) was conducted for Site 6A. The results of the sampling and analysis confirmed the presence of significant soil and groundwater contamination at the old fuel calibration area of Site 6A. The primary contaminants found were chlorinated and nonchlorinated volatile organics and semivolatile organics, primarily associated with petroleum.

In 1995, an RFI was completed. A Phase 2 RI began in 1997 and was completed in 2001. Phase 2 RI activities were conducted to fill data gaps from the previous investigations. Based on the results of the RI, the nature and extent of contamination at this site had been characterized. Therefore, the remediation process was to proceed to an FS to evaluate remedial options to address groundwater contamination. Chlorinated VOCs in the groundwater were the primary site concern.

As part of the 1995 RFI, a HHRA was conducted. The results indicated that there was a potential for adverse non-carcinogenic health effects However, the majority of the risk was attributable to hypothetical residential exposure to chemicals detected in groundwater. In soils, adverse non-carcinogenic health effects are not anticipated for soil exposure pathways evaluated in the baseline risk assessment.

A 2002 Technical Memorandum presented the findings of the test pit excavations, sample collection, and laboratory analysis conducted in June 2001. Historic data for the site was inconclusive as to whether soil contamination remained at the site. In 2001, a petroleum-based floating free product layer remained at the site; however, the thickness of the remaining product to a level that was no longer recoverable via conventional methods. The test data confirmed data from 1995 that did not find evidence of significant soil contamination at this site. Floating petroleum products near the water table and groundwater contamination did remain at the site.

In 2006, a FS/CMS was conducted. The CMS addressed contaminated soil and groundwater at Sites 6A and 10B and the on-site component of the Southern Area groundwater. The 2007 Statement of Basis (SOB) explained the proposed corrective measures for Site 6A and 10B. The recommended Remedial Action for soil at Sites 6A and 10B was Excavation and Off-Site Treatment and Disposal. The recommended Remedial Action for groundwater at Sites 6A and 10B was Land Use Controls (LUCs)/Deed Notifications, Natural Attenuation, and Monitoring.

In 2009 and 2010 soil excavation and offsite disposal, free product recovery, and placement of an oxygen releasing compound was conducted. Approximately 21,000 tons of VOC-, petroleum-, PAH-, and PCB-contaminated soil were removed. Post-excavation revegetation efforts are continuing.

Current/Future Actions: Groundwater monitoring of site wells at Site 6A-Fuel Calibration Area will continue.

Site 6A - Southern Area

Site Description: Site 6A-Southern Area is used to describe a groundwater plume associated with chlorinated solvent and petroleum releases from Site 6A – Fuel Calibration Area, see Site 6A description above for additional information. This plume originates in the area of Site 6A and extends south and east (hydraulically downgradient) to the Peconic River. The plume is estimated to extend over an area of approximately 140 acres and varies from approximately 5 to 10 feet thick near Site 6A and 40 feet thick in the southeast. The plume is characterized by a mixture of chlorinated volatile organic compounds and water soluble constituents of petroleum near Site 6A to almost exclusively 1,1-dichloroethane near the River. The majority of the plume source was removed in a 2009/2010 remedial action. There are no other known or suspected major contaminant sources within this area. However, the area is hydraulically down gradient of Site 6A, Site 10B, and the NWIRP general industrial complex, which could result in small, unidentified sources. The area is mostly wooded and includes two shallow ponds near the northern edge. The southeastern portion of the plume is characterized by extensive woodlands and wetlands, especially near the Peconic River.

Site History: No major industrial-type activities were conducted within the Southern Area. From the late 1980s to the early 1990s, groundwater from Site 6A was discharged into this drainage swale and culvert as well as into the western pond. Although this action is not the only source of the contamination, it likely contributed to contamination identified in the Southern Area. A private club is located in the off-site Southern Area that has four drinking water wells. Two of the wells have been impacted by chlorinated solvent contamination. One well was shutdown and treatment was placed on the second well.

Environmental Investigations/Interim Actions: The 1998 Phase 2 RFI identified a groundwater plume beneath the Southern Area warranting further investigation. In 2006, a FS/Corrective Measures Study (CMS) for Sites 6A, 10B, and the on-site portion of the Southern Area was completed and recommended Remedial Action for these sites. An FS/CMS for the off-site portion of the Southern Area was also prepared.

Response actions at Site 6A – Former Fuel Calibration Area in 2008 to 2010 removed the majority of the source material associated with the Site 6A – Southern Area groundwater VOC plume.

In 2010 and 2011, an anaerobically Enhanced In-Situ Biodegradation Pilot Test (Bio-Study) was conducted at the NWIRP fence line and included periodic sampling and additional reinjections of treatment mixtures via injection wells. Aquifer testing was also conducted within the Site 6A – Southern Area to support the design of a groundwater treatment system. Evaluation of 2011 data suggests that the plume had shifted by approximately 100 feet from the east to the west between 2008/2009 and 2011.

In 2011, the local public water supply was extended to the Peconic River Sportsmans Club (PRSC), which ensures continued protection of human health from exposure to contamination in groundwater. A soil vapor intrusion investigation was conducted at the PRSC. Results of this investigation showed no VOC exceedance of NYSDOH Air Guideline Values or the USEPA target risk range, and the report concluded no action was needed to mitigate vapor intrusion as a potential contaminant migration pathway was warranted at PRSC.

A Record of Decision (ROD) for groundwater at Site 6A-Southern Area was signed in 2012. The ROD identified the selected remedy which consists of Land Use Controls (LUCs) to prevent human exposure to groundwater contaminated with these VOCs; Fence Line Treatment System (FLTS), which consists of extraction, treatment, and discharge of groundwater at the fence line to reduce or eliminate off property migration of contaminants and to reduce potential impacts to downgradient ecological receptors; and groundwater monitoring.

The FLTS began operation in 2014 and intercepts the groundwater VOC plume north of the property boundary in order to prevent discharge of VOCs with concentrations greater than cleanup levels to the Peconic River. The FLTS is designed so it can be modified based on the conditions of the plume (location, VOC concentrations, etc.) to most effectively treat the groundwater.

Current/Future Action: The FLTS continues to operate and a shutdown evaluation is currently in progress.

Site 7 - Fuel Depot Area

Site Description: Site 7 – Fuel Depot Area is located approximately 3,000 feet north of the former south main gate entrance, near the geographic center of the NWIRP Calverton facility within Parcel C. It is located on the east side of the road leading from the south gate entrance, and is relatively flat. The principal visual features of the area are the perimeter fence, a concrete surface, foundations from the old fuel storage, filtration, pumping, and dispensing facilities, an AS/SVE treatment system and the remediation and electrical control buildings. The area surrounding Site 7 contains a combination of structures and woodlands.

Site History: The fuel depot area was used for the storage and distribution of fuel products, such as Jet Propulsion (JP)-4 and JP-5 jet fuels which were stored in USTs. The material was then transferred to trucks for use in the flight preparation areas of the facility. During the 1990s, all of the USTs were removed from the site. In the mid-2000s, the fueling structures were also removed.

Environmental Investigations/Interim Actions: In 1992, a Site Investigation (SI) was conducted for Site 7. The results of the sampling and analysis confirmed the presence of limited soil and groundwater contamination in the area of the USTs. The primary contaminants found were non-chlorinated volatile organics and semivolatile organics, primarily associated with petroleum.

A 1995 baseline HHRA found no adverse risks to current workers. Under future residential land use scenario, adverse risks to human health would be expected from both direct contact with the soils and domestic use of groundwater. The primary contaminants of concern for future residents include PAHs, substituted benzene compounds, and naphthalene compounds.

In 1997, three 50,000-gallon USTs were removed from Site 7. In 1998, three additional USTs were removed from Site 7 - two 10,000 gallon USTs (one gasoline and one diesel) and a 20,000 gasoline UST. In 2002, a FS/CMS was completed for Site 7.

A 2003 Record of Decision (ROD) presented the selected Remedial Action for Operable Unit (OU) 2 - soils and groundwater at Site 7. The selected remedy was consisted of installing an AS/SVE system and conducting short-term groundwater monitoring.

In 2006 an AS/SVE system was installed and the system ran seasonally from March to December until 2013. From 2008 to 2011, additional investigations were conducted, and the system was expanded to address areas that were a continuing source of contamination. Residual contamination remains at the location of the concrete foundation of the former USTs.

Current/Future Actions: Long Term Monitoring of groundwater will continue until cleanup levels are achieved. A Remedial Design is in progress for the removal of UST concrete foundation and petroleum contaminated soil as well as an option for the installation of a targeted AS/SVE system.

Site 10A - Jet Fuel Systems Lab

Site Description: Site 10A – Jet Fuel Systems Lab was used to test fuel and fuel systems. The building is situated east of three former production wells for the facility and across the street just south of the Fuel Depot. Jet Fuel Systems Lab was designated as Building 230 by the Navy and Building 06-11 by NGC. Site 10A is part of a larger 10-acre tract of land designated as NWIRP Calverton Parcel C. Site 10A was transferred to the Town of Riverhead in 2007; however deed restrictions remain in place. Site 10A was used for the testing of fuels and fuel systems.

Site History: The Jet Fuel Systems Laboratory (Building 230) was constructed in 1952. The building and exterior areas were operated until closure in 1996. The building is currently being refurbished by the current property owner.

Environmental Investigations/Interim Actions: In 1995 a leach field containing four cesspools formerly serving Building 230 was investigated as part of a 1995 RFA Sampling Visit. The cesspools were located immediately east of the building. The report concluded that soils and groundwater in the area were potentially contaminated by fuel or fuel/oil related products and recommended further investigation. Subsequent investigations by Navy and NGC identified limited soil contamination underneath the building.

In 1997, as a follow up to the initial RFA, the Navy completed an RFA Site Visit Addendum to confirm the presence or absence of petroleum-related contamination in soils and groundwater near the cesspools east of Building 230. The RFA Sampling Visit Addendum also addressed data gaps pertaining to Site 10A in the RFI and provided additional soil and groundwater data. In 1998 a Phase 2 RFI concluded that a relatively small area (approximately 400 square feet) of freon contaminated groundwater was present near the fuel leaching chamber. In addition, based on soil testing by NGC, solvent and fuel contaminated soil is present in the Contaminated Fuel Leaching Chamber (near A4MW5) and underneath the laboratory (near the Contaminated Fuel Handling System).

A 2005 SOB demonstrated that all corrective action requirements identified in the Permit regarding Site 10A was addressed and no additional investigation or remediation activities were required, however, deed restrictions were needed.

In 2006, an Environmental Baseline Survey to Transfer (EBST) addressed the proposed transfer to the Town of Riverhead. Site 10A included Building 230 (the former Jet Fuel System Test Laboratory), as well as associated exterior paved and landscaped areas. The EBST concluded that Site 10A was environmentally suitable for transfer to the Town of Riverhead for the purposes of economic redevelopment. A 2007 Finding of Suitability to Transfer (FOST) for Site 10A determined that the combination of a cap with appropriate land use controls would be protective of human health. Site 10A was transferred to the Town of Riverhead, Suffolk County, New York in 2007.

Current/Future Actions: A Five-year review will be conducted in 2019.


1322 Patterson Ave. SE, Suite 1000, Washington Navy Yard, D.C. 20374-5065

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