Notwithstanding any other provision of law, the department may, if requested by the nonprofit or public agency and to the extent funds are available, provide for advance payments for services to be performed under any agreement entered into pursuant to the Primary Care Services Act (Section 27) and that is otherwise in compliance with the requirements contained in Section 100350. Individual advance payments made to any nonprofit or public agency that requests those payments shall be made in a timely fashion and shall not exceed 25 percent of the total amount of the grant award.