An optical monitoring system for a two-step polishing process which generates a reflectance trace for each of plurality of radial zones. Furthermore, the FT controller detects discrepancies by comparing checksums sent from the bridges and checksums sent from the other subsystem received via a crosslink, and by this detects process discrepancies between the subsystems. The water vessel includes a propulsion unit configured to navigate the at least one container and the at least one vehicle through the body of water.