In the interest of public service to the citizens of the County, the facilities and service of the Office of the Purchasing Agent may be made available to other public activities in the County which obtain their financial support in part from the County and municipalities. As a condition precedent to providing such service, the other public activity shall agree upon submission of requisition or written request to final fiscal responsibility for such purchases. The Purchasing Agent may establish a schedule of service fees as appropriate with approval by resolution of the County Council.