Work has begun on a $56 million operation to dredge sediment and carcinogenic toxins from the bottom of the Hylebos Waterway, nearly two decades after the federal government declared the channel off Commencement Bay part of Tacomas Superfund site.
Mud at the bottom of the waterway was found to contain dangerous chemicals, including benzene compounds used in pesticides, PCBs and arsenic.
The chemicals are byproducts of pollution from manufacturing companies along the waterway.
