Sites Deleted from Superfund List (NPL)


 

 

Williams Pipe Line Disposal Pit: Listed on NPL 8/90, Delisted from NPL 4/99

 

The Williams Pipe Line Company was a petroleum terminal located in Sioux Falls, SD. The Williams Pipe Line terminal was a large tank farm the stored and distributed petroleum products such as gasoline and jet fuel.

 

The terminal operated a disposal pit on-site which was used in the 1970’s for sludge disposal that accumulated in the petroleum storage tanks. The disposal pit was unlined pit and was where the company reportedly burned the storage tank wastes periodically until the 1970’s. From 1986 to 1987, the EPA tested the sediments in the pit for contaminants and determined that they contained volatile organic compounds (VOCs), heavy metals, pesticides and polycyclic aromatic hydrocarbons (PAHs). The EPA found that groundwater near the pit was contaminated with pesticides and heavy metals. The EPA listed the site on the Superfund National Priorities List on August 30, 1990.

 

The EPA required an investigation of the site to determine the nature and extent of contamination of the disposal pit. The investigation showed there was petroleum and arsenic contamination in the groundwater under the terminal. The petroleum contamination is being addressed under a State order. EPA determined there was not an unacceptable risk from site contamination and did not appear to be likely in the future. Thus, the action required was to conduct a minimum of two years of groundwater monitoring for arsenic. The monitoring was to verify that there is no likely exposure potential to contamination currently or in the future. The EPA delisted the site from the Superfund National Priorities List on April 2, 1999.

 

For More Information Contact:

 

Mark Lawrensen
South Dakota DENR

523 East Capitol
Pierre, South Dakota 57501-3181
Phone: (605) 773-3296

Lisa Llyod
U.S. Environmental Protection Agency
1595 Wynkoop Street
Denver, CO 80202-1129
Phone: (303) 312-6537

 

Whitewood Creek: List on NPL 9/83, Delisted from NPL 8/96

 

Whitewood Creek flows through the towns of Lead and Deadwood in the northern Black Hills and into the Belle Fourche River. Until 1984 the creek was severely impacted by the discharge from the Homestake Mining Company operations. The influence of this pollution extended into the Belle Fourche and Cheyenne Rivers and into the Oahe Reservoir.

 

An EPA study in 1971 showed that Homestake was discharging 312 pounds of cyanide, 240 pounds of zinc, 721 pounds of copper and 2,700 tons of suspended solids, including 9.5 tons of arsenopyrite (AsFeS), a day into Gold Run Creek, which flows into Whitewood Creek. It is estimated that since 1900, about 75 million tons of tailings containing approximately 270,000 tons of arsenic were discharged into Whitewood Creek (Goddard, 1984).

 

The tailings and tailings contaminated soils are also a source of dangerous levels of arsenic. On October 23, 1981, an 18-mile stretch of Whitewood Creek from Whitewood to the Belle Fourche River was proposed for inclusion on the National Priorities List.

 

Cleanup actions were conducted by Homestake in 1992 and 1993 in the flood plain of Whitewood Creek to significantly lower residents' contact with tailings and tailings contaminated soils in high use areas (yards, gardens, driveways, etc.). As a result of remedial activities along this stretch of creek, 27 residential sites have been cleaned up to reduce the health risks associated with exposure to arsenic.

 

In 1994, Lawrence, Butte and Meade counties adopted county ordinances banning future excavation and construction on tailings remaining along Whitewood Creek. These ordinances also detail requirements for obtaining a residential building permit when constructing on "tailings impacted soils" (soil containing arsenic at greater than 100 parts per million). The site has entered the Operations and Maintenance phase, which requires water sampling of Whitewood Creek, monitoring of cleaned up residential sites for flood impacts, a yearly education program, and a five-year review program on the effectiveness of the remedial action. The EPA delisted the site from the Superfund National Priorities List on August 13, 1996.

 

For More Information Contact:

 

Joane Lineburg
SD Department of Environment and Natural Resources
523 East Capito
Pierre, South Dakota 57501-3181
Phone: (605) 773-3296
Kerri Fiedler
U.S. Environmental Protection Agency
1595 Wynkoop Street, Denver, CO 80202-1129
Phone: (303) 312-6493