The SR 520 bridge and landings project replaces the current floating bridge and approaches to improve safety, transit reliability and travel times. After over 50 years of use, the old bridge was showing its age with pontoons sensitive to windstorms and support columns vulnerable to earthquakes. The bridge had only two lanes in each direction. The new bridge span will be able to ride out stronger windstorms, provide greater reliability and more transportation options thanks to the shoulders, HOV/transit lanes and a bicycle/pedestrian path that will accommodate growth in the region. WaterTectonics mobilized a 300 gallon per minute WaveIonics electrocoagulation (EC) system to treat site stormwater from the west approach construction area. The system significantly reduced turbidity and neutralized pH before discharging the treated water into nearby Lake Washington.