The U.S. Army Corps of Engineers (USACE) New York District is conducting environmental investigations and survey activities related to the former Middlesex Sampling Plant (MSP) site located at 239 Mountain Avenue in the Borough of Middlesex, Middlesex County, New Jersey. The MSP was established in 1943 as part of the Manhattan Engineer District (MED) to sample, store, test, and transfer ores containing uranium, thorium, and beryllium. The ongoing site work is being performed under the Formerly Utilized Sites Remedial Action Program (FUSRAP), a program that is cleaning up sites with contamination resulting from the nation’s early atomic energy program.