The earnings of the minor shall be collected by the juvenile work furlough administrator, and it shall be the duty of the minor’s employer to transmit such wages to the administrator at the latter’s request. Earnings levied upon pursuant to Chapter 5 (commencing with Section 706.010) of Division 2 of Title 9 of Part 2 of the Code of Civil Procedure shall not be transmitted to the administrator. If the administrator has requested transmittal of earnings prior to levy, such request shall have priority. When an employer transmits such earnings to the administrator pursuant to this section the employer shall have no liability to the minor for such earnings. From such earnings the administrator shall pay the minor’s board and personal expenses, both inside and outside the juvenile detention facility, and shall deduct so much of the costs of administration of this article as is allocable to such minor. If sufficient funds are available after making the foregoing payments, the administrator may, with the consent of the minor, pay, in whole or in part, the preexisting debts of the minor. Any balance shall be retained until the minor’s discharge and thereupon shall be paid to the minor.