The Berkeley Pit Superfund Site is a former open pit copper mine located in Butte, Montana (Photo: grabadonut/flickr)

The following 10 sites have been added to the EPA's Superfund National Priorities List:

Salt Chuck Mine (Outer Ketchikan County, Alaska)

JJ Seifert Machine (Ruskin, Fla.)

Kerr-McGee Chemical Corp - Jacksonville (Jacksonville, Fla.)

Chemetco (Madison County, Ill.)

Lake Calumet Cluster (Chicago, Ill.)

Gratiot County Golf Course (St. Louis, Mich.)

Kerr-McGee Chemical Corp – Navassa (Navassa, N.C.)

Gowanus Canal (Brooklyn, N.Y.)

Black Butte Mine (Cottage Grove, Ore.)

Van Der Horst USA Corporation (Terrell, Texas)

The following eight sites have been proposed to the National Priorities List:

Sanford Dry Cleaners (Sanford, Fla.)

St. Clair Shores Drain (St. Clair Shores, Mich.)

Vienna Wells (Vienna, Mo.)

ACM Smelter and Refinery (Cascade County, Mont.)

Wright Chemical Corporation (Riegelwood, N.C.)

Black River PCBs (Jefferson County, N.Y.)

Dewey Loeffel Landfill (Nassau, N.Y.)

Smokey Mountain Smelters (Knox County, Tenn.)

Photo credit: grabadonut via flickr/Creative Commons