LITTLE ROCK, Ark. - Certification was denied April 19 in a putative class action in the U.S. District Court for the Eastern District of Arkansas for plaintiffs seeking to represent neighbors of natural gas pipeline compressors and transmission stations for alleged exposure to noise, methane and hydrogen sulfide contamination (Peggy Ginardi, et al. v. Frontier Gas Services, et al., No. 11-420, E.D. Ark.; 2012 U.S. Dist. LEXIS 54845).