The chemical company Diamond Alkali, one of the nation's main producers of Agent Orange, spent years dumping chemical waste into the Passaic River and polluting Newark's Ironbound neighborhood. In the early 80's, state and federal authorities pledged to clean the mess up but today, nearly 40 years later, toxic mud still lies beneath the water. Now the cleanup is facing a $1.8 billion price tag, an uncertain timeline, and the growing threat that intense storms fueled by climate change could stir the pollution up.