Sunday, April 4, 2021 - 5:03 pm MASSENA – The U.S. Environmental Protection Agency (EPA) announced that in-river work will resume next month to clean up sediment contaminated with polychlorinated biphenyls (PCBs) at the Grasse River Superfund Site, also known as the “Alcoa Aggregation.” The EPA, state Department of Environmental Conservation, and the Saint Regis Mohawk Tribe continue to work together on the project. In 2013, EPA selected a cleanup plan for the site that called for dredging and capping of PCB‐contaminated sediment in a 7.2‐mile stretch of river. The 2021 work will primarily include placement of a 12-inch sand, gravel and/or stone cap in the lower five miles of the main river channel from the Route 131 Bridge to the mouth of the Grasse River, covering over 200 acres; sand backfilling in areas dredged in 2020 near Snug Harbor; and habitat reconstruction throughout the site.