As regulations change over time, treatment systems often need to change with them. When effluent discharge standards were lowered for polychlorinated biphenyls (PCBs), this metal recycling client needed to retrofit additional controls at the end of their current system. The client’s consulting engineer designed a redundant filtration and carbon adsorption systems with large (12’ diameter, 20,000lb) and custom vessel construction. WaterTectonics was awarded the project through a competitive bid process. The project required close collaboration with the client’s civil and mechanical contractors, extensive material conformance requirements and construction submittals, as well as comprehensive on-site inspections, system commissioning, and maintenance support. The client was also under a tight compliance schedule, and WaterTectonics coordinated multiple expediting efforts including identifying acceptable part substitutions, conducting various work tasks in parallel, and organizing team drivers for expedited delivery.