Likely, the k-plan has an interest in the GIC, rather than vice versa. Review the GIC contract to determine what, if any, surrender charges apply.
A more interesting question might be why the sponsor wants to terminate the plan. Readers of these Message Boards have noticed several claims of a sponsor seeking to terminate the plan when the underlying reason was dissatisfaction with investment results or administrative procedures. Curing the problem(s) can often be done without plan termination.