Superfund Information Systems: Site Profile

Superfund Site:

HIDDEN LANE LANDFILL
Sterling, VA

Cleanup Activities

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Background

The Hidden Lane Landfill was a 25-acre privately owned and operated disposal facility north of Virginia Route 7 between the Broad Run Farms and Countryside communities. It is immediately adjacent to the floodplain of the Potomac River. Starting in 1971 the facility accepted a variety of solid wastes including construction and demolition wastes, land clearing wastes and other items such as appliances, tires, paper, and cardboard. The county closed down the facility in 1984, pursuant to a local court decision the year before. The Hidden Lane Landfill had been named by county and state health officials as the likely source of the degreasing solvent trichloroethylene (TCE), which was detected in the drinking water wells of some homes in the Broad Run Farms subdivision just west of the landfill in 1989. The Hidden Lane Landfill was added to the National Priorities List (NPL) in March 2008.

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What Is Being Done to Clean Up the Site?

The site is being addressed through state and federal actions.

In 2008, EPA began oversight and maintenance of carbon filtration systems in the Broad Run Farms Community and continues to samples these systems quarterly.

In February 2009, EPA installed a system of monitoring wells at and around the Hidden Lane Landfill Site.  

In 2010-2011, test results from the monitoring wells indicated that EPA needed more information and an additional nine monitoring wells were installed deeper into the groundwater to better characterize the trichloroethylene (TCE) contamination.

In 2012, test results from the deeper monitoring wells showed the location, depth and movement of the TCE plume and confirmed that it moves generally north from the landfill in the direction of the Potomac River.

In 2015, EPA completed indoor vapor intrusion (VI) testing at 18 properties near the Hidden Lane Landfill Site. The purpose of the testing was to determine if vapors from the contaminated groundwater plume were getting inside homes. The results of the tests show that no vapors from the groundwater are entering homes. Additional testing may be needed in the future to ensure that indoor air continues to be protective of human health.

In 2016, EPA conducted a treatability study using microorganisms that consume and degrade TCE. The results of this study are generally positive and may represent a path forward to address site related contamination. This and other treatment methods are being examined for future groundwater remediation.

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What Is the Current Site Status?

EPA has confirmed that the groundwater contamination plume moves generally north from the Landfill in the direction of the Potomac River based on the monitoring data.

In April 2018, EPA released its Proposed Remedial Action Plan (Proposed Plan) for the Hidden Lane Superfund Site.  EPA is issuing this Proposed Plan to present the preferred alternative for an interim remedial action to address exposure of the public to site-related contaminants.

A full description of the preferred alternative, as well as the other alternatives evaluated by EPA, is available here.

 

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Enforcement Information

Consent Decree - May 3, 2017 (PDF)

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