Application of a Framework for Grouping and Mixtures Toxicity Assessment of PFAS: A Closer Examination of Dose Additivity Approaches Read More ← Application of Four Measurement Techniques to Understand Natural Source Zone Depletion Processes at an LNAPL Site → Colorado State Matrix Diffusion Video – This three-minute video produced by Lee Ann Doner and Dr. Tom Sale of Colorado State University shows the effect of matrix diffusion in groundwater systems.