Report MT3D-USGS Reaction Package (RCT) Enhancement in GMS Feature Requests Posted July 9, 2018 As a feature request, adding the new kinetic reaction options in the MT3D-USGS RCT package. The MT3D-USGS manual discusses: 1. Instantaneous reactions between one electron donor and one electron acceptor, 2. Monod kinetics, 3. Sequential first-order reactions, 4. Kinetic reaction between multiple electron donors and acceptors As always, thanks for monitoring these forums.