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What is done with sewage dredge12/5/2023 ![]() It contains several contaminants, including high levels of cancer-causing chemicals known as PCBs and heavy metals like mercury and lead.īetween 1911 and the 1960s, attempts to flush the contaminants out through a tunnel did not eliminate the gunk or the putrid stench that sometimes emanates from the waterway. The sediment is, on average, 10 feet thick along the bottom of the canal, whose depth reaches about 40 feet near its mouth. But its onset is a milestone for the canal, which earned the nickname Lavender Lake for its unnatural hue. ![]() The Environmental Protection Agency has begun a $1.5 billion project to remove the sludge and clean the Gowanus. Now the canal is undergoing its own transformation. As the surrounding industrial wasteland gave way in recent decades to gleaming apartments, and as restaurants and bars popped up on streets dominated by warehouses and parking lots, the noxious sediment - known as “black mayonnaise” because of its color and consistency - lurked below the water’s surface. Since the mid-1800s, industrial pollutants, raw sewage and storm runoff have accumulated in the waterway, making it one of the most contaminated in the country. After more than 150 years, the famously filthy canal in Brooklyn is finally being cleaned out. Again and again this week, it plunged its claw into the murky water, emerging each time with a scoop of fetid black muck. In the middle of the Gowanus Canal, across from a luxury apartment complex and waterfront promenade, a yellow excavator was perched atop a floating barge.
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