Superfund Information Systems: Site Profile

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About the Superfund Redevelopment Initiative

This nationally coordinated effort provides EPA and its partners with a process to return Superfund sites to productive use. Learn more at Superfund Redevelopment Initiative.

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Redevelopment at the Site

The 35-acre Nyanza Chemical Waste Dump Superfund site is located in Ashland, Massachusetts. From 1917 to 1978, companies made textile dyes, dye intermediates and other products at the site. Operators buried solid waste on site and released wastewater to a system of creeks and outfalls that discharged to nearby surface water bodies, including Eastern Wetland and the Sudbury River. Improper waste handling practices resulted in groundwater, soil, sediment and surface water contamination. Indoor air sampling from residences located downgradient from the site and above the groundwater plume showed potentially unsafe levels of vapors. EPA placed the site on the Superfund program’s National Priorities List (NPL) in 1983. Cleanup included removing sludge and contaminated soils and sediments, placing a cap over contaminated soils, and installing systems to mitigate vapors from coming into homes. Cleanup also included extensive wetland restoration. Cleanup activities are ongoing for some portions of the site. In 2013, EPA completed the cleanup design to address contamination in the Sudbury River. Based on sampling conducted in 2014, EPA plans to place a thin sand cap over an 86-acre portion of the river. Several businesses, including Nyacol Nano Technologies, Inc., continue to operate at the site.

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Economic Activity at the Site

As of December 2017, EPA had data on 8 on-site businesses. These businesses employed 46 people and generated an estimated $11,095,150 in annual sales revenue. View additional information about redevelopment economics at Superfund sites.

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