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Valley Forge, PA
The Lockheed Martin campus in Valley Forge, PA, has been an industrial property since the early 1960s. Prior to that, the area was farmland. In December 2006, a 200,000-gallon water tank,that had served as a backup for fire emergencies, was demolished and removed from the property. Lockheed Martin discovered oily sand in the ground directly beneath the tank.
Environmental testing of the sand and soil found the presence of tetrachloroethene (PCE), a manmade liquid solvent used for removing grease from metal surfaces or dry cleaning.
Environmental tests that were completed as part of a remedial investigation indicate that the contamination does not pose health risks to employees at the site, the general population beyond the property boundaries, or the environment.
The drinking water is safe because it is — and always has been — from the public water supply. The supply is tested regularly and meets all regulatory drinking water standards. All contaminated sand and soils were removed and hauled to a permitted landfill.
Because PCE concentrations in bedrock exceeded Pennsylvania regulatory standards, a groundwater investigation was initiated. Lockheed Martin conducted the voluntary remedial investigation in collaboration with the Pennsylvania Department of Environmental Protection under the Land Recycling and Environmental Remediation Standards Act, commonly called PA Act 2.
Testing in April 2007 determined that the PCE had not spread to soil beyond the tank area. A groundwater investigation was initiated after it was determined that PCE concentrations in bedrock exceeded Pennsylvania regulatory standards.
In March 2008, the first groundwater monitoring well was installed, and sampling determined that PCE had reached the groundwater. Over the next 18 months, 12 additional wells were installed to gather more information.
From 2010 through 2012, 27 additional monitoring wells were installed, bringing the total number to 40.Lockheed Martin’s goal, first and foremost, is to protect human health and the environment. Its objectives for the remedial investigation were to:
- Evaluate the nature and extent of contaminants in the groundwater near the former water tank area,
- Collect sufficient data to support the establishment of a Site-Specific Cleanup Standard, and
- Evaluate and select the appropriate groundwater remedy.
A Risk Assessment was completed to evaluate potential environmental-related risks to a number of receptors. The Risk Assessment was completed by interpreting data from groundwater, soil, and soil gas samples collected at the site.
The results of the Risk Assessment indicate there is no risk to the employee population, to the general population beyond the property boundaries, or to the environment.
The Remedial Investigation Report will describe the recommended remedial approach. The recommended approach will be to monitor concentrations of groundwater contaminants as they decrease over time through natural processes.
The rate of decrease will be confirmed through the ongoing collection and laboratory analyses of groundwater samples.
A vapor intrusion investigation consisting of sampling of indoor air, sub-slab vapor, and soil gas was conducted for buildings in the vicinity of the source area. The investigation results indicated no indoor air quality samples exceeded non-residential Medium Specific Concentrations (MSC) for groundwater-related constituents in the majority of site buildings.
In building 600, concentrations of PCE detected in one sub-slab and one indoor air sample collected exceeded the non-residential MSC. Concentrations of PCE detected in one sub-slab and one indoor air sample collected in the Tunnel 9000 (T9000) portion of Building 100 exceeded the MSC.
Although these single detections do not pose a health risk to the employees, vapor intrusion mitigation strategies are being evaluated for both buildings and will be implemented in 2015-2016.
In addition to the ongoing collection of samples from the groundwater monitoring wells and the evaluation of potential soil vapor mitigation strategies at T9000 and Building 600, the following activities will be completed:
Fall 2014 - Submit Remedial Investigation Report and Risk Assessment Report
Spring 2017 - Submit Act 2 Groundwater Closure Report