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.