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Super Fund Site PCB contaminated transformer leaking PCB contaminated transformer leaking Polyclorinated Biphenols are perstistent synthetic chemicals that were manufactured for high temperature applications like transformer oil. Unfortunately these chemicals are fat soluble and have accumulated in the bodies of plants and animals world wide. As these chemicals move up the food chain, they become more concentrated, so animals like polar bears and humans who eat fish, seals and whales will accumulate dangerous levels of PCBs in their fat tissues. PCBs as a family of chemicals are no longer being manufactured, but they are so stable that virtually all that has not been made still exists and may eventually find its way into the environment.
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