River sediment levels are monitored during dredging operations on General Electrics ongoing PCB remediation in the upper Hudson River near Lock 2 just south of Mechanicville Thursday afternoon, Aug. 20, 2015, in Halfmoon, N.Y. GE said it has cost more than $1 billion to field a flotilla of dredges and barges as well as build the treatment plant. Between 1947 and 1977, GE dumped 1.3 million pounds of PCBs into the Hudson from capacitor plants in Hudson Falls and Fort Edward. (Will Waldron/Times Union) Photo: WW