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Why have PCBs been so hard to clean up in Puget Sound and connected rivers?
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Why have PCBs been so hard to clean up in Puget Sound and connected rivers?

User Medik
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One of the reasons PCB's have been hard to clean up from the puget sound is because they stay in the food chain. Once something is inside an animal it becomes much harder to remove from the environment than if it was just in water.
User SofDroid
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