The contingency plan shall be amended by the department when necessary to improve emergency immediate actions in response to a hazardous substance discharge, after consultation with other affected agencies. At a minimum, the contingency plan shall be reviewed by the department at least every 4 years. The department shall maintain records of emergency actions and non-emergency immediate actions taken by the department in response to hazardous substance discharges and these records shall be taken into account when reviewing the contingency plan.
Wis. Admin. Code Department of Natural Resources NR 702.07