In addition to the requirements of Subparts A and B of this part, a claimant must establish-

(a) That the actions taken were necessary to prevent, minimize, or mitigate the effects of the incident;

(b) That the removal costs were incurred as a result of these actions;

(c) That the actions taken were determined by the FOSC to be consistent with the National Contingency Plan or were directed by the FOSC.