(a) To ensure adequate public participation in regional board proceedings relating to land disposal of wastes, the following persons and entities shall receive individual notice of any public hearing or board meeting involving classification of waste management units or the issuance of waste discharge requirements for classified units:

(b) Notice of hearings or meetings related to Class I waste management units or discharges of hazardous waste shall be given not less than 45 days before the meeting at which such actions will be taken, and copies of the agenda package shall be available not less than 30 days before the meeting, provided that enforcement actions involving releases of hazardous wastes may be taken at meetings which comply with the 10-day notice requirements of the California State Body Open Meetings Act and that emergency actions (as described in Subsection 647.2(d) of this Chapter) shall be exempt from public participation and notice requirements.