19.4-acre manufacturer of construction materials located on the Duwamish Waterway in Seattle, Washington.

2+ Million gallons of stormwater storage.Electrocoagulation system installed in 2010 which was found to contribute to the effluent copper concentration.

Bench-scale treatability testing performed in 2019 showed that particulate and adsorptive filter media would meet all permit benchmarks.

EC treatment taken off-line.Replace multimedia in filter with high performance media &  add adsorptive mixed media polishing in 2020 as a corrective action.

Effluent has met all benchmarks since installation.