WaterTectonics was contacted by Atkinson Construction for rapid response in treating water at the Mercer West project site in Seattle. The Mercer Corridor Project West Phase (Mercer West) improves a major east-west arterial bottleneck by creating a continuous two-way street from Interstate 5 (I-5) to Elliott Avenue West. With onsite turbidity preventing discharge and trucking off water not keeping up, Atkinson chose to lease a skidded UltraFlo ultrafiltration system with automated controls, filtration pump, flow meter, backflush tank and pump. WaterTectonics treated 120,000 gallons of water in a single day, including mobilization and demobilization, with discharge within Construction Stormwater General Permit (CSWGP) limits.