The two correct answers related to the response to the fire on the Chattooga River are:
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Congress passed the Clean Water Act into law - This act aimed to restore and maintain the integrity of the nation's waters, partly in response to environmental disasters and concerns raised during that era.
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The National Environmental Policy Act was passed which led to the formation of the EPA - This act established a framework for environmental protection and oversight, contributing to the establishment of the Environmental Protection Agency (EPA) to manage environmental issues.
The other options you provided (Rachel Carson's "Silent Spring" specifically addressing that fire and the location being declared a Superfund site) are not correct in the context of the immediate responses to that fire event.