An official website of the United States government.

This is not the current EPA website. To navigate to the current EPA website, please go to This website is historical material reflecting the EPA website as it existed on January 19, 2021. This website is no longer updated and links to external websites and some internal pages may not work. More information »

Hazardous Waste Cleanup: Former TRW Danville Site in Danville, Pennsylvania

On this page:

Cleanup Status

From 1852 through the 1980s, TRW disposed of waste liquids at the Danville plant in four unlined earthen disposal pits and nineteen underground storage tanks. Consequently, waste oils, solvents, and waste liquids have leaked into the soil and groundwater.

The soil was contaminated with such substance as petroleum products, volatile organic compounds, polychlorinated biphenyl (PCBs), arsenic, chromium and lead. Beginning in 1985, TRW removed all the underground storage tanks and contaminated soils.

The groundwater was contaminated with volatile organic compounds, petroleum products, and PCBs. Under the supervision of Pennsylvania Department of Environmental Protection (PADEP), TRW began operation a groundwater remediation system in April 1989 which continues to the present. The system included slurry cutoff wells, monitoring and recovery wells, a vacuum extraction system, a granulated activated carbon filter, and an air sparger. The groundwater remediation system was formalized in a February 1994 Consent Order and Agreement with PADEP (amended October, 1994). Reports required by the Order show that as of 1996, migration of the groundwater is under control.

On March 24, 1998, EPA determined that both the Human Exposures and Groundwater Environmental Indicators have been met. EPA is currently evaluating the information to determine if all of the corrective action requirements have been met.   A statement of basis for corrective action with controls was posted on August 26, 2015.

Top of Page

Site Description

Interactive map of Former TRW Danville Site, Danville, PA

View larger map

TRW is a 250,000 square foot site located in Danville, Montour County, Pennsylvania. The major operations conducted at the plant were forging, cutting and grinding, chrome plating, and packaging of valves for various internal combustion engines.  This facility is no longer operating.

Iron parts have been built on this site since 1847.  TRW bought the property in 1951 and the valve division began operations in 1981.  In 1983, TRW moved the part of the division that generated hazardous waste to Route 11 and Woodbine Lane in Danville (now Aldan Industries).

Top of Page

Contaminants at this Facility

The groundwater contains volatile organic compounds, PCBs, and petroleum products.  Currently, the groundwater remediation system prevents the groundwater from migrating offsite.

Top of Page

Institutional and Engineering Controls at this Facility

Institutional Controls enforced through an Environmental Covenant include:

A. Land use is limited to industrial and commercial activities (excludes schools, nursing homes, day care centers, and other residential style facilitates and recreation areas), as well as limits on digging and excavation activities.
B. Groundwater use is prohibited for any purpose.  
C. Routine inspections and reporting required to confirm compliance with the engineering and institutional controls.
D. Routine inspections and reporting to ensure that the physical integrity of the PSSDS vent piping, stacks, and wind turbines in the Former Steel Room is intact and the wind turbines are functional.
E. Ensure the existing asphalt/building coverage remain in place.
F. Ensure that no intrusive disturbance of the asphalt/soils overlying the slurry wall has occurred.

Top of Page

Land Reuse Information at this Facility

The site is unused.

Top of Page

Site Responsibility at this Facility

Resource Conservation and Recovery Act (RCRA) Corrective Action activities at this facility have been conducted under the direction of EPA Region 3.

Top of Page