TerraTherm - a Cascade Company

TerraTherm to Remediate Soils at the Beede Waste Oil Superfund Site - Case Study


Courtesy of TerraTherm - a Cascade Company

The Beede Site is the former location of a state-licensed and regulated waste oil recycling and disposal facility. The nearly 41-acre Site is located in a residential area of Plaistow, New Hampshire (NH). Operations at the Site began in the 1920s, and continued until the state of NH ordered its closure in 1994. From the 1920s to 1994, thousands of NH residents and businesses were customers of the site and disposed their waste oil, as recommended by the state of NH. Thousands of other business customers in New England and beyond also used the Site for waste oil recycling and disposal, as well as for shipping petroleum-contaminated soil for asphalt batching in the last years of the Site's operation. The site also contained an open area for disposal of household waste by local residents. As a result of soil and groundwater contamination, the United States Environmental Protection Agency (EPA) declared the facility a Superfund Site in 1996.

To date, cleanup activities at the Beede Superfund Site have included: removal of water, oil and sludge from storage tanks and drums formally located on the site, removal of approximately 100,000 gallons of waste oil from the groundwater table, design and construction of a groundwater treatment system, and construction of a water line for residents whose private wells were impacted by the Site. The cleanup continues to address remaining contamination at the Site including soil, sediment, groundwater and surface water.

The soils at the site will be treated by TerraTherm with Steam Enhanced Extraction (SEE) to remove the contaminants. SEE is a highly effective technology that has been used for the recovery of contaminants and the remediation of volatile organic compounds (VOCs) since the mid-1990s. SEE achieves on-site separation and treatment through steam injection into wells and extraction of hot fluids. Steam generation is a stable and predictable process, governed by heat transfer to the soil. It has been studied intensively and used for oil recovery and remediation of a wide range of contaminants.

SEE is used at low and moderate temperatures. Injection and extraction wells are installed and used to inject steam into the soil while steam, vapors, mobile contaminants, and groundwater are simultaneously extracted. The injected steam is used to heat the subsurface to target treatment temperatures, typically the boiling point of the contaminant.

  • TerraTherm will treat the site in two stages - one Light Non-Aqueous Phase Liquid (LNAPL) hotspot at a time.
  • Existing groundwater treatment facilities will be used to treat the extracted groundwater.
  • Thermal treatment extends to 32 ft depth.

Apart from the groundwater treatment plant coupled with SEE to remediate deeper contaminants, the majority of the contaminated soil will remain on site until it is trucked off and replaced with clean fill. Although the remedial efforts have been underway since Beede Waste Oil was shut down in 1994, major steps are now being taken to return this property to a beneficial use.

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