CHARLESTON, W.Va. - Class certification was denied Sept. 30 in the U.S. District Court for the Southern District of West Virginia in a medical-monitoring class action alleging exposure to fugitive metals and chemicals from a silicon metals refinery in Alloy, W.Va.; two experts retained by the plaintiffs to offer opinions with respect to the determination of class membership are inadmissible, according to the presiding judge (James Coleman, et al. v. Union Carbide, et al., No. 11-366, S.D. W.Va.; 2013 U.S. Dist. LEXIS 140613).