Superfund Information Systems: Site Profile

Superfund Site:

WILLOW GROVE NAVAL AIR AND AIR RESERVE STATION
HORSHAM, PA

Cleanup Activities

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Background

This 1,200 acre site is comprised of the Naval Air Station Joint Reserve Base Willow Grove (NASJRB/WG) and the Willow Grove Air Reserve Station (WGARS), which are operating U.S. Navy and U.S. Air Force installations, respectively, located in Montgomery County, Pennsylvania. The installations are co-located within one perimeter and are located approximately 25 miles north of Philadelphia. Aircraft operations at the site began during the 1920s when the facility was named Pitcairn Airfield. The U.S. Navy acquired the airfield in 1942 and began jet training there in 1949. Currently, NASJRB/WG and WGARS provide materials, facilities, services, and training in direct support of all units assigned to the stations. The site was listed on the EPA's National Priorities List on September 29, 1995.

Activities that generate, store, or dispose of hazardous waste at the facilities fall into four general categories: (1) aircraft maintenance; (2) base civil engineering; (3) fuel operation and (4) personnel training. Sources of potential contamination on Navy property include, but are not necessarily limited to, the Privet Road Compound, Antenna Field Landfill, Ninth Street Landfill, the former Fire Training Area and a fuel farm.

On the Air Force property, a washrack area, a stormwater retention basin, a fuel farm, and a number of hazardous waste storage areas have been identified as potential sources of contamination.

Analysis of groundwater samples collected from wells located near the Privet Road Compound area, which is near the border of the Navy and Air Force properties revealed contamination from various chemicals. Samples from two Navy drinking water supply wells showed levels of tetrachlorethene (PCE) above EPA-established health-based levels. Water form the Navy potable water production wells receives preliminary treatment (air stripping) to remove volatile organic compounds (such as PCE) before entering a storage tank. Treated water in the storage tank is monitored to ensure no levels of potentially harmful contaminants are reached. Water from the storage tank is further treated for bacterial disinfection and testing prior to distribution throughout the base for drinking and other uses.

Over 800 employees at the two facilities may consume or come into contact with treated water from the Navy supply wells. The source(s) of contamination found in groundwater is under investigation by EPA Site Assessment Branch.

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What Is Being Done to Clean Up the Site?

  • The site is being addressed through federal actions. The long-term remedy for soil at Site 1 Privet Road included no further remedial action following cleanup activities in 1999.
  • EPA selected the long-term remedy groundwater at Site 1 Privet Road in 2008 and design of land use controls is ongoing.
  • Investigations at the Site 3 Ninth Street Landfill are ongoing.
  • The long-term remedy for Site 6 Abandoned Rifle Range No. 1, Site 7 Abandoned Rifle Range No. 2, and soil at Site 5 Fire Training Area included no further action.

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What Is the Current Site Status?

  • Site 1 groundwater is contaminated with PCE and TCE from a suspected off base source and Site 5 groundwater is contaminated with several VOCs.
  • The Bioremediation pilot study at Site 5 is installed and operating. The sodium bicarbonate is being added to raise the pH of the groundwater. Lactate will be added as the substrate (to feed the bugs). The need for bioaugmentation will be evaluated.
  • At Site 3 studies revealed historical landfill activity. There are ongoing investigations to access the nature and extent of landfill activities.
  • The Agency for Toxic Substances & Disease Registry (ATSDR) has performed a Public Health Assessment of the Naval Air Station Joint Reserve Base & Air Reserve Station Willow Grove and found "No Apparent" threats to public health or to the environment. This ATSDR document is dated September 2001.

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EPA’s Involvement at the Site

The site is being addressed through federal actions. The site was listed on the EPA's National Priorities List on September 29, 1995.

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Emergency Response and Removal

Cleanup has also included removal actions, or short-term cleanups, to address immediate threats to human health and the environment. Actions in 1999 at Site 1 Privet Road removed contaminated soil. Removal actions at Site 5 Fire Training Area removed about 430 cubic yards of contaminated soil.

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Operable Units

During cleanup, a site can be divided into a number of distinct areas depending on its complexity. These areas, called operable units (OUs), may address geographic areas, specific problems, or areas where a specific action is required. Examples of typical operable units include construction of a groundwater pump and treatment system or construction of a cap over a landfill.

View a list of all of the operable units at this site.

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Cleanup Progress

View the schedule for cleaning up this site.

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