Witnesses: Jeff Byron; Mike Gros; Jerome Ensminger; Robert Dickerson, Jr., Command. Gen., Camp Lejeune, NC; Kelly Dreyer, Environ. Restoration Program Mgr., U.S. Marine Corps; Pat Leonard, Office of the Judge Advocate Gen., Claims, Invest., and Tort Litigation; Thomas Sinks, deputy dir., Nat. Center of Environmental Health, Agency for Toxic Substances and Disease Registry (ATSDR), accomp. by Frank Bove, Sr. epidemiologist, ATSDR, and Morris Maslia, environmental engineer, ATSDR; Peter Murtha, Dir., Office of Criminal Enforcement, Forensics and Training, Office of Enforcement and Compliance Assurance, EPA; Marcia Crosse, Dir., Public Health and Military Health Care Issues, GAO; Franklin Hill, Superfund Div., EPA. Illustrations.