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                    U.S. Environmental Protection Agency, Region 3
                            Chillum Site - Gasoline Fact Sheet
                         Remedy Implementation Status Update
                                        March 2011
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 gasoline 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 (D.C.).

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 the gasoline
release at the Chillum Site.

The AOC issued to  Chevron became effective
January 2009.
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Area A is located on and around the former
gasoline station. Work here includes the
expansion of the existing Dual Phase Extraction
(DPE) system by installing one angled recovery
well that will terminate under Eastern Avenue. In
addition, four new DPE wells will be installed in
and around the parking lot of the shopping center.
All of the new wells will be connected to the
existing DPE system.

Area B is in the alley north of Oglethorpe Street
(referred to as Oglethorpe Alley). Work here
 includes the installation of two on-site
groundwater remediation wells.

Construction in Area A is scheduled to begin
during the Spring of 2011, and in Area B during
the Summer of 2011, pending final permit
approval from the requisite D.C. government
agencies.
 ERA's Proposed System Expansion
                              GroundmterardSoilfepor
                              to Treatment Sysietn
                                                             Eastern Avenue
                                                                               Riggs to Parking Lot

                                                                               Vertical Extraction Well
                  Submersible "
                    Pump

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Area C is located in the alley north of Nicholson
Street (referred to as Nicholson Alley). Work in
this area will include the installation of a series
of oxygen injection wells in the alley to create an
oxygen reactive zone.

Construction in Area C has begun with the
installation of 5 oxygen wells completed. The
second phase of construction entails installation
of an underground vault and piping trenches.
This work is scheduled to take place in the
Spring of 2011, pending final permitting from
the Department of Transportation.

The groundwater remediation systems for all
three areas are expected to be completed and
operational by the Fall of 2011.

Vapor Mitigation Systems - All systems
identified in the remedy have been installed and
are in operation.

• 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

Information about this site can also be found at:
http://www.epa.gov/reg3wcmd/chev7003.htm

Additional Information Contact

Andrew H. Fan
EPA Project Manger
fan.andrew@epa.gov or
call 215-814-3426

Amie Howell
EPA Government Liaison
howell.amie@epa.gov or
call 215-814-5722
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