During fueling and defueling operations, care shall be taken to prevent overflow of fuel. If such spillage occurs it is the responsibility of the persons or company causing the overflow to clean the area immediately. If damage occurs from such spillage, the airport manager may require the offending person or his employer to pay for repair of said damage. No aircraft engine shall be started when there is fuel on the ground under said aircraft. (Added by Res. adopted June 24, 1974).