Waste Site Cleanup & Reuse in New England
Wells G & H
The Wells G & H Superfund Site covers approximately 330 acres in Woburn, Middlesex County, Massachusetts. It includes the aquifer and land mass area located within the zone of contribution to the City of Woburn’s two municipal drinking water wells known as Wells G & H. The Olympia Property is one of the five primary source areas of contamination within it. The other four source areas are the W.R. Grace Co. property, the UniFirst Corporation property, the New England Plastics property and the Wildwood Conservation Corporation property. The 21-acre Olympia Property is located within the boundaries of the site at 60 Olympia Avenue. The Aberjona River flows north to south through the Olympia Property and splits it. On the east side of the river is a one-story commercial building used as a trucking terminal. West of the river are undeveloped woodland and wetland areas. It is in this western portion that the former drum disposal area was located.
TCE-contaminated soils (up to 110 mg/kg) were present in the subsurface at about eight to twenty feet below grade in the former drum disposal area. These soils have contaminated groundwater and act as an ongoing source of groundwater contamination. The associated groundwater plume has contributed to contamination of the aquifer that serves Wells G & H. In addition, PCBs (Aroclor 1260 up to 33 mg/kg) were present in exposed surface soils in the former drum disposal area. Pursuant to an Administrative Order on Consent, the removal proceeded as a responsible party-led action. The responsible party completed the excavation and off-site disposal of the PCB-contaminated surface soils, developed a work plan and began cleanup of the TCE contamination. Olympia injected about 29,260 gallons of sodium permanganate solution (various concentrations) to date. Ongoing groundwater monitoring indicated that the permanganate reagent has been delivered throughout much of the treatment cell. Removal activities included continued monitoring to ensure compliance with cleanup standards established in the Record of Decision (ROD). Future injections will be conducted at the rate of about six events per year as need to achieve the cleanup standards.
Location: Woburn, MA
Start date: 03/28/2003
End date: 05/08/2009
Contact: Emily Zimmerman (email@example.com) or 617-918-1029