Superfund Information Systems: Site Profile

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Site Background

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.

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EPA’s Involvement at this Site

Salt Lake City purchased the site property in 1957. The city rediscovered the waste disposal area during expansion of the adjacent city park in 1976.

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Site Status

The site’s long-term remedy included construction of a slurry wall around the pit to isolate the wastes and prevent groundwater contamination; installation of a clay cap on top of the pit; installation of groundwater wells to monitor the ongoing effectiveness of the slurry wall; groundwater monitoring; and placement of traffic barriers around the perimeter of the cap to prevent cap damage. Remedy construction took place between 1982 and 1992. Groundwater monitoring is ongoing.

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Work to Protect Human Health and the Environment

The site is being addressed through potentially responsible party (PRP) actions.

EPA has conducted several five-year reviews of the site’s remedy. These reviews ensure that the remedies put in place protect public health and the environment, and function as intended by site decision documents. The most recent review concluded that response actions at the site are in accordance with the remedy selected by EPA and that the remedy continues to be protective of human health and the environment.

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Site Risks

Risks and pathways addressed by the cleanup include health risks from people ingesting, inhaling or touching contaminants soil or groundwater contaminants.

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Salt Lake City identified the site as an expansion area for Rosewood Park. Residents of the Rose Park neighborhood frequently use this recreation area. EPA collaborated with the state, the city and the PRP on the park’s expansion. The expansion included additional parking areas and a dog park, which was the first area in the neighborhood where dogs could play unleashed. As part of the park expansion, the city also built a new playground, put in exercise equipment and sidewalks, and installed new landscaping. The city also converted a property next to the west side of the site into a skate park. The expansion of the park onto the site has provided several added amenities to the community while improving remedy protectiveness by prohibiting motor vehicle access to the cap.

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