U.S. Environmental Protection Agency, Region 3 Chillum Site - Gasoline Fact Sheet Implementation of Final Remedy September 2009 Background EPA issued its Final Decision and Response to Public Comments outlining the final remedy for the gasoline release that occurred at the former Chevron gas station previously owned by Chevron USA, located in Chillum, Md. The release impacts the neighboring Lamond-Riggs Park community located in the District of Columbia (DC). Final Remedy Subsequent to the Final Decision on the remedy selection, EPA issued to Chevron, USA, an Administrative Order on Consent (AOC) which specifies the work and the timetable upon which Chevron must perform the required work to implement the Final Remedy for gasoline at the Chillum Site. The AOC with Chevron became effective during January 2009. 2) EPA has approved the conceptual design plan and implementation schedule for the Oxygen Curtain, to be located north of Nicholson St. The detailed design plan is projected for October 2009. Subject to permitting, installation of the Oxygen Curtain is projected to begin by December 2009. 3) The Final Remedy called for the installation of individual vapor mitigation systems in homes located above the gasoline plume where petroleum vapor concentrations exceeded EPA's indoor air standards. These installations were completed in March 2009. Testing results in other homes did not exceed EPA's standards. 4) EPA has approved the conceptual design plan and implementation schedule for the Independent Groundwater Remediation System (IGR) well below Eastern Avenue. The detailed design plan is projected for December 2009. Subject to permitting approval, installation of the well is projected to begin Spring 2010. Current Status of Work Required by the AOC EPA, in consultation with the D.C. Department of the Environment has approved the conceptual design plan and implementation schedule for the Final Remedy. The detailed design plan for the Oxygen Curtain is expected by October 2009 and for the remaining remedy components by December 2009. The approved design for this component of the remedy incorporates several beneficial features not specified in the system originally selected. This system addresses several of the concerns that citizens raised. The IGR will not require a vent pipe above ground, will require less space, will operate more quietly and require less maintenance. (See Figure Below) 2 ft Subject to permitting from the D.C. Department of the Environment (DDOE) and/or the Maryland Department of the Environment (MDE) the remedy implementation is expected to proceed as follows: 1) The existing groundwater remediation system located on the portion of the Site within Maryland is currently and will continue in operation; a) The detailed design plan for expansion of the existing groundwater remediation system through the installation of an angle recovery well under Eastern Avenue into D.C. is projected for December 2009, and subject to permit approval, installation of the angle well is projected to begin Spring 2010. Activated Carbon m S| Water Table j- II 9 ft v&m \ ------- Site History To view previous Fact Sheets and other information relating to this Site go to: http://www.epa.gov/reg3wcmd/chev7003.htm Administrative Record The Administrative Record, which contains EPA's Final Remedy and the Administrative Order on Consent issued to Chevron USA is available at: •Lamond-Riggs Branch Library 5401 South Dakota Avenue, N.E. Washington, D.C. 20011 202-541-6255 •U.S. EPA, Region 3 1650 Arch Street Philadelphia, PA 19103-2029 Please call Anna Butch at 215-814-3157 to schedule a convenient time to review the Administrative Record. For Additional Information Contact Andrew H. Fan EPA Project Manger fan.andrew@epa.gov or call 215-814-3426 Shawn Garvin EPA Government Liaison garvin.shawn@epa.gov or call 215-814-2998 ------- |