EPA selects new groundwater cleanup plan for Baird & McGuire Superfund site in Holbrook
After about 25 years of cleanup at the former chemical plant, the agency says contamination has dropped but groundwater remains polluted, and it will now treat it underground at an estimated cost of about $7.1 million.
The U.S. Environmental Protection Agency has chosen a revised interim plan to clean up contaminated groundwater at the Baird & McGuire Superfund site in Holbrook, Massachusetts, the agency said Monday.
After about 25 years of active cleanup, contaminant levels at the site have fallen, but the groundwater is still polluted, according to the EPA. The agency began a study of additional cleanup options in 2023 and based the new approach on that work.
"We've made real progress at the Baird & McGuire Site, but we need a different approach to address the groundwater contamination that remains," said EPA Regional Administrator Mark Sanborn.
Under the plan, the EPA will treat the polluted groundwater underground by injecting sulfate, which the agency said helps break down harmful chemicals naturally and traps arsenic so it cannot spread. Other options under consideration for arsenic include filtering the groundwater or underground treatment using air or a barrier that captures the arsenic until conditions improve.
The agency said it will keep monitoring whether pollution outside the treatment areas declines enough to meet drinking water standards and will watch for any sign that contamination is reaching groundwater in the bedrock. Restrictions on using the groundwater, along with engineered barriers, will stay in place until cleanup goals are met.
The EPA estimates the plan, including construction, operation, maintenance and long-term monitoring, will cost about $7.1 million. The decision followed a 37-day public comment period on the agency's proposal.
Baird & McGuire Company Inc. ran a chemical mixing and batching operation at the site for about 71 years, making herbicides, pesticides, disinfectants, soaps, floor waxes and solvents. The EPA said those operations released volatile and semi-volatile organic compounds, pesticides and arsenic into the soil and groundwater.
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