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Riggs Park - Chevron Gasoline Spill

Description (EPA)

In October 1989, there was a reported release of an unknown amount of gasoline from an underground storage tank, at a service station owned and operated by Chevron Products Company, located at 5801 Riggs Road in Chillum, Maryland. The release was initially addressed by the Maryland Department of the Environment (MDE). MDE required Chevron to install a pump and treat system to remove the gasoline from the ground water. It has been in operation since 1990.

In April 2001, the gasoline plume was reported to have migrated into the District of Columbia, underlying a residential area known as the Lamond-Riggs Park community. The Riggs Park neighborhood is just south of the boundary between the District and Maryland. Subsequent investigation revealed that Perchloroethylene (PERC) was also present in groundwater at elevated concentrations.  View additional information about the PERC investigation on the EPA website.

In October 2001, then Councilmember Fenty asked EPA to assume responsibility for the gasoline release investigation. Through a series of orders, EPA has required that Chevron investigate the extent of groundwater and vapor contamination, expand the operation of the existing pump and treat system, and install vapor mitigation systems in certain homes.

In addition to the testing performed by Chevron pursuant to the EPA Orders, there have been additional studies, including additional vapor contamination testing by the District.

Read the Frequently Asked Questions for more information about Riggs Park.


Recently, the District concluded its review of data gathered by its contractor in 2008, and determined that additional relief is indeed required. The District's May, 2010 final remedy selection, February, 2009 proposed decision document, and index to the supporting administrative record are available below. Files and links to other Riggs Park reports, orders and letters can be found below as well. 

View the entire Index of Documents [PDF] that are available at the Lamond-Riggs library located at 5401 South Dakota Avenue, NE, Washington, DC.  Phone Number: (202) 541-6255

DDOE Contact Information: Email Sharon Cooke, Director of Community Outreach, District Department of the Environment.

Chevron Hotline: Call (202) 289-2257.  There is an option to leave a message if you have a question.

Additional Information:

  • View additional information about Riggs Park on the EPA website.
  • View a map of the Riggs Park/Chillum area.