For a number of years, TRI has been evaluating the short- and longterm structural integrity of buried stormwater quality units. In 2018, we initiated full-scale hydraulic evaluations of manufactured treatment devices (MTDs) and nutrient removal products. MTD testing is based on ASTM standards (C1745 and C1746), while nutrient removal testing evolves from collaboration with product manufacturers to establish the appropriate simulation of runoff quantities and nutrient concentrations. Joel Sprague, TRI South Carolina’s Technical Director, is leading the hydraulic systems evaluation initiative. Joel may be reached at JSprague@tri-env.com or 864-346-3107.