Project
Large Marine Terminal
Large-scale stormwater treatment for a marine terminal with a range of operations
A 90-acre marine terminal at the Port of Tacoma, composed entirely of impervious surfaces, required a stormwater treatment solution to manage runoff from five distinct drainage basins. The site supports a range of industrial activities, including cargo handling, equipment maintenance, fueling, and washing—operations that contribute to elevated levels of total copper, total zinc, and turbidity in stormwater discharges to the Blair Waterway.
To address these pollutants and achieve permit compliance, chemically enhanced sand filtration (CESF) was selected as the treatment approach. The project team reconfigured drainage by installing new pump stations and conveyance infrastructure, consolidating five basins into two optimized treatment zones. Two CESF systems were installed: a 1,000gpm system for Basins 5 and 6, and a 2,400gpm system for Basins 2, 3, and 4—providing targeted, high-capacity treatment for this heavily industrialized site. Since deployment, the systems have treated over 100 million gallons of stormwater.
The CS-20 control system is a modular, turnkey solution for automated water treatment operations housed in a 20’ CONEX box.
The CS-20 contains PLC-based controls, pump motor contactors and/or VFDs, chemical dosing systems for flocculants and pH, as well as water quality monitoring components and fail-safe valving to ensure compliance. This system houses multiple chemical storage tanks with containment to accommodate large volumes or several types of treatment chemistry in a climate-controlled environment.
Features Include:
