Measured and simulated arrival waves for transport of PFOS in (A) Eustis soil (Experiment 2) and (B) Vinton soil (Experiment 2). The PFOS simulations are produced using the continuous-distribution multi-rate model with: linear, non-hysteretic sorption/desorption (CD-Linear), linear, hysteretic sorption/desorption (CD-Linear-Hysteretic), nonlinear, non-hysteretic sorption/desorption (CD-Nonlinear), and nonlinear, hysteretic sorption/desorption (CD-nonlinear-hysteretic).