Service of any document or notice other than the earnings withholding order may be made by either personal delivery or by first-class mail, postage prepaid. If service is made on the employer after the levying officer has received the employer’s return, the service shall be made on the person and at the address designated in the return to receive notices, whether or not such address is within the county. (CCP 706.101(c)) If the notice or document to be served runs in the debtor’s favor, and the levying officer’s permission has been obtained, it may be personally served by the debtor or the debtor’s agent. (CCP 684.140)