ON JULY 10, 2008, EPA ENTERED INTO A RCRA 7003 ADMINISTRATIVE ORDER ON CONSENT WITH CHEVRON U.S.A INC. FOR ITS FORMER GASOLINE SERVICE STATION LOCATED AT 5801 RIGGS ROAD IN CHILLUM, PRINCE GEORGE'S COUNTY, MARYLAND. DURING ITS OWNERSHIP AND OPERATION OF THE SERVICE STATION, RELEASES OF PETROLEUM-RELATED CONSTITUENTS, BENZENE, TOLUENE, ETHYLEBENZENE AND XYLENE, MTBE, AND TPH GRO, CONTAMINATED THE GROUNDWATER AT TAND FROM THE FACILITY. THE PRIMARY HUMAN HEALTH CONCERN ASSOCIATED WITH THE CONTAMINATED GROUNDWATER UNDER CURRENT CONDITIONS IS VAPOR INTRUSION INTO RESIDENTIAL BASEMENTS LOCATED DIRECTLY ABOVE THE PLUME. THE CONSENT ORDER REQUIRES CHEVRON TO PERFORM INTERIM MEASURES INCLUDING CONTINUING TO OPERATE AND MAINTAIN THE EXISTING GROUNDWATER REMEDIATION SYSTEM AND THE INDIVIDUAL VAPOR MITIGATION SYSTEMS INSTALLED AT EFFECTED RESIDENCES. THE ORDER WILL BE AVAILABLE FOR PUBLIC REVIEW AND COMMENT FOR THIRTY CALENDAR DAYS.