NASHUA – U.S. Environmental Protection Agency representatives discussed the ongoing efforts to remediate the Mohawk Tannery site during a special Tuesday Board of Aldermen meeting.
Featuring potentially radioactive barium, as well as carcinogenic dioxin and arsenic, the property along the Nashua River is an EPA Superfund site.
“The plan as it is conceived right now is to basically contain all that waste that is already in there by building a containment structure, or wall around it,” EPA Remedial Project Manager Gerardo Millan-Ramos told board members on Tuesday.
“The general idea or approach here is to basically consolidate all this waste in this area by building that secant wall first up to the soil level and then on top of it a containment wall that would hold the initial waste and then have it capped with an impermeable cap,” Millan-Ramos added.
New Hampshire and Rhode Island Superfund Section Chief Melissa Taylor said as a “back of the envelope estimate” to dispose of the Fimbel Door Landfill waste off site at a disposal facility would be about $6.5 million. However, some money could be saved, dropping that price tag down to around $4.5 million if no retaining wall is built.
“The proposal, as the neighbors understand it, has not been to clean up the lagoons – it has been to add more to them and then cap it,” Alderman Tom Lopez, Ward 4, said. “There’s a separate chamber that they are describing behind the two lagoons, but they also have a plan to pile stuff higher on the secant wall, if I understand correctly.”
Gerardo then softly replied by saying, “correct.”