Answer:
The Hudson River was contaminated when General Electric dumped a huge amount of polychlorinated biphenyls (PCBs) into the Hudson River between 1947 and 1977.
General Electric proposed a plan of sediment dredging to clean up the polychlorinated biphenyls (PCBs) in the river but the PCBs are not safely buried in the sediment and dredging was not enough to clean up the PCB. This PCB has already entered the food web and the underground water of the Hudson River was also already spread in different places, so dredging was not enough to clean up the PCB.
Answer:
It continued because they didn't fully clean up all of the contamination as well as the fact that the wildlife was still living in the contaminated waters. This allowed for the contamination issues to continue for decades after the initial date it happened.
Explanation:
Lowkey the other guy said it better but this is what I put
