317 F.3d 889 UNITED STATES ex rel. Pat COSTNER; Sharon Golgan; Carolyn Lance; Debra Litchfield; Becky Summers; Kenny Brown; Edward Campbell; Don Daniel; Jeffrey Foot; David Hermanson; Arkansas Peace Center; Vietnam Veterans of America, Arkansas State Council, Inc., Plaintiffs/Appellants,v.UNITED STATES of America, Movant,URS Consultants, Inc.; Morrison Knudsen Corporation; MRK Incineration, Inc.; Vertac Site Contractors, Defendants/Appellees. […]