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Region 8

Williams Pipe Line Co. Disposal Pit

National Priorities List (NPL) History

Proposed Date

Final Date

Construction Completion Date

Deletion Date

Note: EPA no longer updates this information, but it may be useful as a reference or resource.

Williams Pipeline site location map

Site Type: Deleted NPL
City: Sioux Falls
County: Minnehaha
Street Address: 5300 W. 12th St.
ZIP Code: 57107
EPA ID: SDD000823559
SSID: 08J4
Site Aliases: Williams Pipeline Disposal Pit
Congressional District: At Large

What's New?

Updated January 2012

We will no longer periodically update this Web page. In Federal Register notice 64 FR 15926 dated April 2, 1999 the EPA, in consultation with the state of South Dakota, determined that this site poses no significant threat to public health or the environment and no further remedial measures are appropriate.

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Site Description

The site is located on the Williams Pipe Line 12th Street Terminal property at the intersection of 12th Street and Marion Road in Minnehaha County, Sioux Falls, South Dakota. The disposal pit, or burn pond, was located in the northeast corner of the terminal. The terminal included an unlined pit about 40 feet in diameter and 7–9 feet deep. The terminal also included 42 above-ground petroleum fuel tanks, a fuel loading rack, garages, an administration building and other support structures.

In 1966, the terminal was purchased by Williams Pipe Line Company from the Great Lakes Pipe Line Company. Historically bulk quantities of liquid fertilizers as well as petroleum products were stored and conveyed at the terminal including fuel oil, diesel fuel, unleaded gasoline, aviation gasoline and jet fuel. Tanks and pipe racks at the terminal were used to convey and store petroleum fuel to the loading racks where delivery vehicles were filled.

The burn pond was constructed in 1945 and used until 1987 to collect storm water runoff, often contaminated with spilled materials, from various areas of the terminal. Petroleum products accumulating on the pond surface were periodically burned off.

EPA added the site to the Superfund National Priorities List (NPL) in 1990.

Map of Site and Operable Unit Boundaries (PDF) (4.4MB, about PDF)

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Site Risk

In 1987, the Superfund investigation of soil and groundwater focused on volatile organic compounds, pesticides, hydrocarbons and metals. The investigation found volatile/semi-volatile organic compounds contaminating the groundwater. These contaminants are commonly found in petroleum products and were likely associated with the petroleum releases being addressed by the state. Much of the risk, which has now been addressed, was associated with the site-related petroleum contaminants.

Media Affected Contaminants Source of Contamination
groundwater arsenic, petroleum hydrocarbons pit where petroleum waste was stored/burned


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Cleanup Progress

The following cleanup activities were completed in 1994 by the potentially responsible party:

  • Installation of recovery trenches along the boundaries of the site to capture the contamination and to prevent contaminated groundwater from moving off site at unacceptable levels.
  • Two years of groundwater monitoring to confirm that no unacceptable exposure would likely occur in the future.
  • An additional two quarters of groundwater monitoring data.

Once the entire set of quarterly data were evaluated and the cleanup levels in the Record of Decision achieved, EPA deleted the site from the NPL in April 1999. No further operation and maintenance activities are needed.

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Community Involvement

Community involvement plays an important role in the Superfund process. EPA uses a number of different tools and resources to promote effective, on-going, meaningful community involvement. The goals of the Superfund community involvement program are to:

  • Keep communities affected by sites informed throughout the cleanup process.
  • Provide opportunities for communities to comment and offer their input about site cleanup plans.
  • Facilitate the resolution of community issues tied to a site.

No community involvement activities are ongoing.

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EPA places a high priority on land reuse as part of its Superfund response program mission. The agency tries to select cleanup options that encourage and support future use of a site. EPA uses two fundamental methods to facilitate reuse of Superfund sites:

  • Exploring future uses before the cleanup remedy is implemented, an approach that gives the Agency the best chance of designing cleanup remedies to support the likely future use of a site
  • Working with landowners and communities to remove barriers not considered necessary for the protection of human health or the environment at those sites where remedies are already in place

One option for reuse is the siting of clean and renewable energy projects on contaminated (or formerly contaminated) lands. As part of this effort, EPA is evaluating the potential for energy projects on these properties and working with landowners and communities to identify ways to remove barriers to such projects.

The William Pipe Line property remains in continued use.

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Land Use Controls and Other Institutional Controls

Land use controls are the most common type of institutional control (IC). ICs are administrative or legal controls that help reduce the likelihood for human exposure to contamination. ICs can also help protect the integrity of the remedy. Examples of ICs are:

  • Zoning ordinances.
  • Environmental covenants.
  • Deed notices.
  • Well-drilling restrictions.
  • Building permits.
  • Informational advisories.

This site does not require ICs, which means there is no contamination remaining at the site that could result in an unacceptable exposure and/or remedy components at the site that could be damaged.

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Five-Year Reviews

EPA or the lead agency conducts five-year reviews following the start of a Superfund cleanup when contamination is left on the site. These reviews are repeated every five years. We use these reviews to determine:

  • How the remedy is working.
  • If the remedy remains protective of human health and the environment.

Five-year reviews are not required at this site because there is no contamination remaining at the site.

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Site Documents

Map of Site and Operable Unit Boundaries, September 12, 2011 (PDF, 1 pg, 4.4MB, about PDF)

Federal Register Notice of Deletion from the NPL, April 2, 1999

Record of Decision, September 29, 1994 (PDF, 40 pp, 63K, about PDF)

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Armando Saenz
Remedial Project Manager
U.S. Environmental Protection Agency, Region 8
1595 Wynkoop Street (EPR-SR)
Denver, CO 80202-1129
800-227-8917 ext. 312-6559 (toll free Region 8 only)

View Documents at:

Siouxland Libraries
Main Library
200 North Dakota Avenue
P.O. Box 7403
Sioux Falls, SD 57117-7403

South Dakota Department of Environment & Natural Resources
Ground Water Quality Program
Joe Foss Building
523 East Capitol
Pierre, SD 57501-3181

EPA Superfund Records Center
1595 Wynkoop Street
Denver, CO 80202-1129
800-227-8917 ext. 312-6473 (toll free Region 8 only)


Mark Lawrensen
Ground Water Quality Program
South Dakota Department of Environment and
Natural Resources
Joe Foss Building
523 East Capitol
Pierre, SD 57501-3181

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Photo/Video Gallery

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Links Exit EPA Disclaimer

Williams Pipe Line Disposal Pit Narrative at the South Dakota Department of Environment & Natural Resources

South Dakota Ground Water Quality Program

South Dakota State Library: Federal Government Publication Depository Libraries

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About Region 8

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