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. For more information about the PERC investigation, please visit the 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.

Recently, the District concluded its review of data gathered by its contractor in 2008, and determined that additional relief is indeed required. The Distric'ts February, 2009 decision document, and index to supporting administrative record, are available below.

Files and links to other Riggs Park reports, orders and letters can be found below. DDOE has also sent DVDs  of the below-listed documents to the Lamond-Riggs library located at 5401 South Dakota Avenue, NE, Washington, DC.

Document Name	Date
Gannett Fleming Semi-Annual Progress Report, July 2009*	07-17-09
Frequently Asked Questions	05-06-09
Notice of Opportunity for Public Comment	03-06-09
Administrative Record Index	02-23-09
Remedy Selection*	02-23-09
Remedy Fact Sheet	02-10-09
SSPA, Riggs Park Sampling Analysis Report*	02-09-09
Gannett Flemming 4th Quarter 2008 Progress Report*	01-30-09
Response from Chevron to DDOE regarding data Info / UST basins*	12-08-08
Groundwater Data - Former Chevron Facility # 122208*	12-04-08
Gannett Fleming Semi Annual Sampling Report*	11-14-08
Papadopoulos Data Quarter 3*	10-16-08
Papadopoulos Data Quarter 2*  (Part 2)	08-11-08
Papadopoulos Data Quarter 2*  (Part 1)	08-04-08
George Hawkins' Letter to Bowser*	10-14-08

Contact information: Sharon Cooke, Director of Community Outreach, District Department of the Environment, Sharon.Cooke@dc.gov.