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Record of Decision System (RODS)



City & State:  WARMINSTER TOWNSHIP  PA  18974
County:  BUCKS
EPA ID:  PA6170024545
EPA Region:  03
NPL Status:  Currently on the Final NPL
ROD Type:  Record of Decision
ROD ID:  EPA/ROD/R03-95/218
ROD Date:  03/10/1995
Operable Unit(s):  03
Media:  groundwater
Contaminant:  Tetrachloroethylene(PCE), acetone, arsenic, beryllium, thallium
Abstract:  Please note that the text in this document summarizes the Record of Decision for the purposes of facilitating searching and retrieving key text on the ROD. It is not the officially approved abstract drafted by the EPA Regional offices. Once EPA Headquarters receives the official abstract, this text will be replaced.

The Naval Air Development Center is a 734-acre Naval facility located in Warminster Township, Bucks County, Pennsylvania. In January 1993, the Naval facility was renamed Naval Air Warfare Center (NAWC) Aircraft Division Warminster. The Site lies in a populated suburban area surrounded by private homes, various commercial and industrial activities, and a golf course. On-site areas include various buildings and other complexes connected by paved roads, the runway and ramp area, mowed fields, and a small wooded area.

The longest runway, which is currently the only active runway, is generally located along the topographically highest area at the Site. Many of the primary NAWC buildings are located west of the airstrip, along Jacksonville Road, a public road which traverses the Site from north to south. A housing development for military enlisted personnel is within the southeastern portion of the Site. A wastewater treatment plant owned and operated by NAWC is located in the northwestern corner of the Site.

Commissioned in 1944, NAWC's main function is research, development, testing, and evaluation for Naval aircraft systems. NAWC also conducts studies in anti-submarine warfare systems and software development. Under the Defense Base Realignment and Closure Act, the NAWC will be closed. All activities will be relocating to Patuxent River, Maryland, with the exception of an enlisted men's housing area in the southwestern corner of NAWC. Current schedules indicate the NAWC will be relocated by September 1997.

NAWC currently has about 2,000 employees, and 1,000 people reside at the enlisted men's housing area year round. The closest off-base home is about 200 feet away from the NAWC property line. Residential development is located along the length of the southern property line of NAWC and to a lesser extent, along the northern property line. Industrial development is located along the west and northwest perimeter of NAWC property. Groundwater is used extensively as a source of water by both residents and industry in the immediate vicinity of the Site.

NAWC is situated on an upland area divided between two local drainage basins. Both local drainage basins lie within the regional drainage basin of the Delaware River.

Historically at the Site, wastes containing hazardous substances have been generated by NAWC during aircraft maintenance and repair, pest control, fire-fighting training, machine and plating shop operations, spray painting, and various materials research and testing activities in laboratories. The wastes generated have included paints, solvents, sludges from industrial wastewater treatment, and waste oils. From 1940 to 1980, these wastes were disposed of in pits, trenches, and landfills located on current NAWC property. In addition, wastes generated by NAWC were burned in a fire training area until 1988.

To date, eight areas on current NAWC property have been identified as areas used for the disposal of wastes containing hazardous substances. None of these areas are currently used for waste disposal.

The findings of the remedial investigation (RI) with respect to contaminated groundwater attributable to Area C are as follows: tetrachloroethylene (PCE) and acetone were the two organic contaminants detected at significant concentrations and frequency; arsenic, beryllium and thallium were inorganics detected at elevated levels.

The selected remedy for OU-3 is the third response action addressing the Site. OU-3 consists of contaminated groundwater attributable to Area C at the Site. The objective of the selected remedy for OU-3 is to restore contaminated groundwater attributable to Area C to a level protective of human health and the environment.
Remedy:  The selected remedy for OU-3 includes the following major components: installation, operation and maintenance of groundwater extraction wells; installation, operation and maintenance of an onsite groundwater treatment system which includes precipitation, filtration, air stripping and carbon adsorption, and/or other necessary means of treatment; periodic sampling of treated water to ensure the effectiveness of the treatment system; discharge of treated water to an unnamed tributary of Little Neshaminy Creek; installation, operation and maintenance of a vapor phase carbon adsorption unit; offsite treatment and/or disposal of solid residuals generated during water treatment and control of air emissions; monitoring of groundwater in monitoring wells and residential wells; installation and periodic sampling of observation wells to ensure the effectiveness of the groundwater extraction wells; and modification of the groundwater extraction well system and/or groundwater treatment system as necessary based on periodic evaluations.
Text:  View full-text ROD [ 62K ]
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