Administration of the federal Superfund program : hearings before the Subcommittee on Investigations and Oversight of the Committee on Public Works and Transportation, House of Representatives, One Hundred Second Congress, second session, May 19, 1992 (liability issues), June 9, 1992 (risk assessment), June 30, 1992 (selection of remedy), July 28, 29, 1992 (federal facilities), September 15, 1992 (innovative and alternative cleanup technologies).