A contract pursuant to Section 12302 shall include the following provisions:

1. (a) The cost of the service shall not exceed by more than 10 percent the allowable cost of the service as determined by the State Department of Social Services.
2. (b) The provider agency shall agree to give preference to the training and employment of recipients of public assistance or other low-income persons who would qualify for public assistance in the absence of such employment.
3. (c) The cost of the purchase of such service will qualify, where possible, for the maximum federal reimbursement.

4. (d) A bond may be obtained to secure payment of wages in the event that bankruptcy, liquidation, embezzlement, fraud, or other factors prevent payment of wage claims to homemakers, homemaker chore workers, or other in-home supportive service personnel.

   The provisions of this section shall not restrict the right of a chartered county from providing a civil service classification for in-home supportive service personnel.