Watertown Daily Times A barge loaded with capping materials arrives at the in-water remediation site in 2019 on the Grasse River in Massena. (Provided photo â Christopher Lenney, Watertown Daily Times) MASSENA — Environmental remediation work spanning decades is continuing this month on the Grasse River in Massena. The U.S. Environmental Protection Agency on Tuesday announced the in-river work at the Alcoa Aggregation Superfund Site will resume in April. The site is a collection of properties owned and maintained by the former Aluminum Company of America, Alcoa, which changed its name to Arconic in 2016, and split into Howmet Aerospace Inc. and a subsidiary, Arconic Corporation, last year.