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72 Chapter 8 Potential Future Research Ferric oxide is a promising treatment media for highway runoff treatment and the results of this study suggest that additional investigation is warranted. Potential future studies include the following: ï· Evaluation of different ferric oxide media in a full scale treatment system, including: o Iron mining tailings which have residual ferric oxide or elemental ion o Ferrihydrite o Granular ferric oxide o Several different zero valent iron materials that will be parent material for ferric oxide. ï· Evaluation of the kinetics of ferric oxide and metal binding. ï· Laboratory and field testing of ferric oxide media in a matrix other than sand to increase the hydraulic conductivity, reduce contact time, and ultimately reduce the treatment cell footprint. ï· Laboratory and field testing of different ferric oxide media with OGFC. ï· Examine the potential long-term longevity of ferric oxide with a number of different matrices (e.g., sand, coarse sand, crushed limestone, etc.). ï· Evaluate ferric oxide media longevity and media amendment/replacement requirements throughout the life of constructed BMPs. Compare how observed operation and maintenance costs compare to those estimated.