Troy Mills, Inc. went into Chapter 7 bankruptcy in 2003, and its landfill on Rockwood Brook was added to the National Priorities List on September 29, 2003. The landfill is about 1.5 miles from the center of Troy, situated off a former rail line (now a trail) on a 270-acre property. Troy Mills used 11 acres of the property as an industrial waste disposal area from 1967 to 2001. Between 1967 and 1978 two acres of the 11-acre landfill were used for disposal of drums of liquid waste and sludge containing Varsol, vinyl resins, plasticizers, pigments, top-coating products and industrial organic solvents. After 1978, the remaining nine acres were used to dispose of waste fabric scraps and other solid waste from the company's manufacturing complex.
In 2003, the US Environmental Protection Agency (EPA) implemented an interim system to collect free product in a series of interceptor trenches. During 2004 and 2005, EPA removed 7,687 buried drums containing approximately 30,000 gallons of flammable liquid waste and more than 3,000 cubic yards of other wastes. Approximately 26,000 tons of contaminated soils were also removed, and all materials were safely disposed off-site. The area was re-graded, a permeable soil cap was placed over the former drum disposal area, and the site was reseeded. A record of decision (ROD), signed in September 2005, requires long-term environmental monitoring, maintenance of the interceptor trenches and landfill cap, and establishment of property use restrictions.
Since October 2006, the New Hampshire Department of Environmental Services (DES) has been implementing the ROD under a Cooperative Agreement with EPA.
The town elected not to accept ownership of the property from the bankruptcy court, and future ownership is uncertain. The bankruptcy trustee has granted DES a permanent easement both to access the 270-acre property and to restrict activities and uses in the vicinity of the former disposal site and the groundwater management zone. The easement is on record at the Cheshire County Registry of Deeds.
The first Five Year Review was completed in September 2010. Recommendations included conducting a supplemental investigation of the residual free product source area, further evaluating the effectiveness of the interceptor trenches, performing a supplemental hydrogeologic study to confirm the effectiveness of the monitored natural attenuation management of migration remedy at the site and to better forecast time to cleanup, and reviewing existing data to evaluate potential ecological risk within the ground water/surface water transition zone.
In 2011 and 2012 EPA and DES completed a Laser Induced Fluorescence investigation to define the extent of residual free product in and around the interceptor trenches. In 2013 the interceptor trenches were dismantled and removed along with excavation of limited residual free product-containing soil encountered during this activity, and trench-area restoration activity was completed in 2014.
DES continues to conduct periodic monitoring of the ground water and surface water at the site and will be coordinating the second Five Year Review for completion in September 2015.