Gresham Smith has been a major contributor to the implementation of the significantly enhanced deicer management system, leading development of the system concept during schematic design, providing high-end computer simulations using our proprietary GlyCAST deicer management software, and leading the design of an anaerobic fluidized bed reactor biological treatment system. Since the deicer management system’s initial construction, Gresham Smith has designed new online total organic carbon (TOC) monitors, which are tied to the control system. The monitors separate clean and contaminated water and further segregate contaminated water into dilute and concentrated fractions to optimize storage and treatment efficiency. Our work at PDX has improved the Port’s ability to achieve compliance with its regulatory permits and provides a significant increase in flexibility for responding to Portland’s highly variable weather and deicing conditions.