What's in Harvey's sludge?

9/21/2017
As a result of Hurricane Harvey, many tons of silt and sediment have been deposited on the banks of the region's bayous, adjacent land, streets and buildings as flood waters have receeded. Such material may seem like simple sandy particles but it may contain unknown hazards. Follow this link to read the Houston Chronicle's article about "What lurks in the sludge that Harvey left behind?"