(1) Administrative practices before and pertaining to the office of superintendent of public instruction are governed by the state Administrative Procedure Act, chapter 34.05 RCW, the Washington State Register Act, chapter 34.08 RCW, and the state office of Administrative Hearings Act, chapter 34.12 RCW. These acts govern the conduct of "agency action," "adjudicative proceedings," and "rule making" as these terms are defined in RCW 34.05.010. The rules of the state code reviser provided in chapter 1-21 WAC, and as hereafter amended, and the rules of the office of administrative hearings provided in chapter 10-08 WAC, and as hereafter amended, shall govern procedures and practices before the superintendent of public instruction for the following: Petitions for declaratory rulings; petitions for adoption, amendment, or repeal of a rule; and the conduct of adjudicative proceedings. All other regulatory actions and hearings conducted by the office of superintendent of public instruction may be conducted informally at the discretion of the superintendent.