The Rose Park Sludge Pit site is located at Rosewood Park in Salt Lake City, Utah. The Utah Oil and Refining Company disposed of acidic waste sludge in an unlined pit on site from the 1930s until 1957. The sludge pit covered an area of about 5 acres and the waste material extended as deep as 20 feet below ground surface. A petroleum refinery east of the site served as the source of the waste material. These waste disposal activities contaminated soil and groundwater with hazardous chemicals. Following cleanup, EPA took the site off the Superfund program�s National Priorities List (NPL) in 2003. Site maintenance activities are ongoing.