(March 1, 2016, 1:46 PM EST) -- NEW CASTLE, Del. — In a lawsuit against power plant operators for their alleged unlawful dumping of toxic coal ash waste, an expert may not testify as to concentrations and dispersion of polycyclic aromatic hydrocarbons (PAHs), a Delaware judge ruled Feb. 26, granting in part a motion to exclude (Anajai Calcaño Pallano, et al., v. The AES Corp., et al., No. N09C-11-021 JRJ, Del. Super., New Castle Co.; 2016 Del. Super. LEXIS 101)....