858 P.2d 232 CRAIG RETTKOWSKI, ET AL, Respondents, v. THE DEPARTMENT OF ECOLOGY, ET AL, Appellants. No. 59086-9.The Supreme Court of Washington. En Banc. September 9, 1993. [1] Administrative Law — Agency Authority — In General. An administrative agency’s authority to act is limited to that which it is authorized to do by the Legislature. […]