(a) The final order in a proceeding which affects substantial interests shall be in writing and made a part of the record and include findings of fact and conclusions of law separately stated, and it shall be rendered within 30 days:

(1) After the hearing is concluded, if conducted by the agency;

(2) After a recommended order, or findings and conclusions are submitted to the agency and mailed to all parties, if the hearing is conducted by a hearing officer; or

(3) After the agency has received the written and oral material it has authorized to be submitted, if there has been no hearing. The 30 day period may be waived or extended with the consent of all parties and may be extended by law with reference to specific agencies.

(b) Findings of fact, if set forth in a manner which is no more than mere tracking of the statutory language, shall be accompanied by a concise and explicit statement of the underlying facts of record which support the findings. If, in accordance with agency rules, a party submitted proposed findings of fact or filed any written application or other request in connection with the proceeding, the order shall include a ruling upon each proposed finding and a brief statement of the grounds for denying the application or request.

(c) If an agency head finds that an immediate danger to the public health, safety, or welfare requires an immediate final order, it shall recite with particularity the facts underlying such findings in the final order, which shall be appealable or enjoinable from the date rendered.

(d) Parties shall be notified either personally or by certified mail return receipt requested of any order and, unless waived, a copy of the final order shall be so delivered or mailed to each party or to his attorney of record. Provided, however, that, except as hereinafter provided, notification of any order other than a final decision or order subject to judicial review may, where permitted by existing statute, be delivered by first class mail, postage prepaid, and delivery shall be effective upon deposit of the notice and, unless waived, the final order in the mail; provided, the notification of the final order subject to judicial review, together with a copy of the final order, shall be delivered either by personal service as in civil actions or by certified mail, return receipt requested.