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 all of these hold: (a) procedures are in place to keep that work from being cross-contaminated by GMO dealings needing PC2 containment; (b) those procedures are written down; and (c) the primary container, and any secondary container, used to take an organism out of the facility is free of GMO contamination before it leaves.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.