A new study pegs a pair of San Antonio-area utilities as operators of two of the nation’s most-contaminated coal ash waste dumps. The Poisonous Coverup report by Environmental Integrity Project (EIP) and Earthjustice names San Miguel Electric Cooperative’s plant, an hour south of the Alamo City, as the location of the nation’s most contaminated coal ash site. Meanwhile, city-owned utility CPS Energy’s Calaveras Power Station, located on the South Side, ranked 94th on the watchdog groups’ list.