Thermally Enhanced Soil Vapor Extraction and Bioremediation

From 1910 to 1997, a seven-acre chemical manufacturing facility in New York produced enamels, insulating varnishes and resins. Due to historic chemical spills, the New York State Department of Environmental Conservation classified the site under the State Superfund Program and split it into two operable units: OU-1 (contaminated groundwater) and OU-2 (contaminated site soils).

To address contaminated soils, a number of subsurface investigations were completed from 1984 to 2008. Volatile organic compounds (VOCs) and semi-volatile organic compounds (SVOCs) were detected below ground surface. As a result, a NYSDEC Record of Decision identified the proposed remedy for OU-2 as thermally enhanced soil vapor extraction (TESVE).

Given the site’s size and location within a residential neighborhood, an innovative approach was needed to successfully meet the project goals. TESVE, is a combination of SVE/air injection technology that heats soils to increase volatilization and promote biodegradation of VOCs/SVOCs. Although high temperatures are typically used, low temperature TESVE was selected since it required less infrastructure, reduced impacts to the community, and was half the cost of the high temperature thermal remedy and a quarter of the cost of an excavation remedy.

The system was constructed with modular components to facilitate reuse at other sites once remedial goals were reached. This saved time, resources and unnecessary waste. The system also allowed direct access for preventative maintenance or repair, and accommodated shut-down of specific zones, lowering operating costs and providing flexibility to target areas of higher contamination.

Awards:
  • 2020 ACEC New York Engineering Excellence Awards, Platinum Award, Environmental
  • 2019 ENR New York Regional Awards, Best Project, Water/Environment
Project Services:
  • Investigation
  • Feasibility Study
  • Remedial Design
  • Construction Oversight
  • Remedial Operations
  • Closeout