06:56
Paths of Pollution: PCBs and the Great Lakes
As industries began to proliferate around the Great Lakes and its tributaries, contamination also began to accumulate in its waters. PCBs, which do not biodegrade, were routinely discharged into the environment before scientific evidence revealed th...
04:25
Paths of Pollution: Great Lakes: Remediation Methods
The three main methods of remediation are hydraulic dredging, natural attenuation, and capping the contaminated sediments with a layer of clay or sand. Dredging is the preferred method because of its permanency. The contaminated sediments go through...