Emeryville, California, and the challenge of cleaning up poisoned land
In 2004, Emeryville, an industrial suburb of San Francisco, sent an environmental remediation crew to inject 15,000 gallons of cottage cheese into groundwater below an abandoned factory. The factory manufactured car bumpers from 1951 to 1967, and the hexavalent chromium it left behind had since traveled into the groundwater. Hexavalent chromium gives humans cancer, trivalent chromium doesn’t, and cottage cheese converts the former to the latter.