(2) The order shall include, but need not be limited to, the following:

1. (a) The name and location of the dairy farm;
2. (b) The reasons for the suspension or revocation, and a description of such operation;
3. (c) The date the suspension or revocation is or will become effective;

(3) Orders for suspension or revocation shall be served on the certificatee or his or her authorized agent as follows:

1. (a) By sending him or her a copy of the order by registered or certified mail, return receipt requested; or
2. (b) Personally, by any person authorized by the Department to serve; or

3. (c) If the aforementioned methods of service are unsuccessful, service may be made by any person authorized to serve civil process as follows:

   1. 1. By leaving a copy of the order at his or her last and usual place of abode; or
   2. 2. By posting a copy of the notice in a conspicuous place on or about the farm premises if his or her last and usual place of abode is unknown.