In the sixties, hexavelent chromium was used as a rust inhibitor in cooling towers in a Hinkley PG&E compressor station. It caused ground water contamination af

In the sixties, hexavelent chromium was used as a rust inhibitor in cooling towers in a Hinkley PG&E compressor station. It caused ground water contamination affecting the health of many. https://en.wikipedia.org/wiki/Hinkley_groundwater_contamination https://en.wikipedia.org/wiki/Hinkley_groundwater_contaminat...