Haw. Code R. § 19-37-6
Persons engaged in aircraft fuel handling shall exercise diligence and care to prevent overflow or spillage of fuel and to avoid any combustion hazard. If fuel is spilled from fuel service equipment or from aircraft during refueling, fuel servicing shall be immediately discontinued. The refueler responsible for the spill shall immediately contain and remove spilled fuel and prevent runoff into the airport drainage system. The party responsible for the spill will assume all cleanup costs, including reimbursing the State for any costs incurred as a result of any fuel spill containment or cleanup and any repair or restoration of airport facilities damaged by the spill. The airport fire crew shall be notified if a spill is over 5 gallons and 10 feet in any dimension or over 50 square feet in area; continues to flow; or is otherwise a hazard to persons or property. Failure to report a fuel spill or failure to contain and remove spilled fuel and prevent entry or runoff into the airport drainage system may result in penalties or arrest as specified in Sections 261-17 and HRS 261-21, Hawaii Revised Statutes.
Haw. Code R. § 19-37-6