In this file photo, workers cover an acid pit at McClellan Air Force Base with tarps to try to prevent winter rains from adding to the base’s pollution problems.
In this file photo, workers cover an acid pit at McClellan Air Force Base with tarps to try to prevent winter rains from adding to the base’s pollution problems. Sacramento Bee file
In this file photo, workers cover an acid pit at McClellan Air Force Base with tarps to try to prevent winter rains from adding to the base’s pollution problems. Sacramento Bee file