(a) The office shall be prepared to respond promptly to a discharge of oil or a hazardous substance.
(b) The office may respond under (a) of this section to an oil or hazardous substance discharge only if
(1) the oil discharge is a catastrophic oil discharge that constitutes an emergency under AS 46.04.080(a);
(2) the discharge of oil or a hazardous substance is declared to be an emergency under AS 46.03.865;
(3) the governor declares the discharge an emergency under AS 26.23;
(4) the commissioner reasonably believes that there has been a discharge of oil or a hazardous substance, or that there is a potential discharge of oil or a hazardous substance, and the discharge may qualify under (1) - (3) of this subsection; or
(5) the commissioner reasonably believes that the discharge or potential discharge poses an imminent and substantial threat to public health or welfare or to the environment.
(c) When the office or corps responds to an oil or hazardous substance discharge under this section, its activities shall be guided by the relevant provisions of the incident command system applicable to the type of discharge to which it is responding.