People who work there with non-GMOs, on exempt dealings, or on dealings that a PC1 facility could host must also follow Part C, unless there are procedures that keep that work from being cross-contaminated by PC2 GMO dealings, those procedures are written down, and the primary container and any secondary container used to take an organism out are free of GMO contamination before they leave. Where those three conditions are met, dealings suitable for PC1 may follow either Part C or the PC1 certification guidelines. Separation by place or by time, with surfaces decontaminated between organisms, are examples of preventing cross-contamination.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.