Washington, D.C.—The Nasdaq Stock Market^SM announced that trading was halted in Sevenson Environmental Services, Inc. (NASDAQ:SEVN), today at 4:39 p.m., Eastern Time, for "additional information requested" from the company at a last price of $13.10. Trading will remain halted until Sevenson Environmental Services, Inc. has fully satisfied Nasdaq's request for additional information.

For news and additional information about the company, please contact the company directly or check under the company's symbol using InfoQuotes^SM on the Nasdaq Web site.

For more information about Nasdaq, visit the Nasdaq Web site at www.nasdaq.com or the Nasdaq NewsroomSM at www.nasdaq.com/newsroom.