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Delivery operations to tanks for Class I, II or III liquids shall comply with Sections 2305.1.1 through 2305.1.3 and the applicable requirements of Chapter 57.
2305.1.1 Delivery Vehicle Location
Where liquid delivery to above-ground storage tanks is accomplished by positive-pressure operation, tank vehicles shall be positioned not less than 25 feet (7620 mm) from tanks receiving Class I liquids and 15 feet (4572 mm) from tanks receiving Class II and IIIA liquids, measured from the tank to the nearest unloading valve on the tank vehicle.
2305.1.2 Tank Capacity Calculation
The driver, operator or attendant of a tank vehicle shall, before making delivery to a tank, determine the unfilled, available capacity of such tank by an approved gauging device.
2305.1.3 Tank Fill Connections
Delivery of flammable liquids to tanks more than 1,000 gallons (3785 L) in capacity shall be made by means of approved liquid- and vapor-tight connections between the delivery hose and tank fill pipe. Where tanks are equipped with any type of vapor recovery system, all connections required to be made for the safe and proper functioning of the particular vapor recovery process shall be made. Such connections shall be made liquid and vapor tight and remain connected throughout the unloading process. Vapors shall not be discharged at grade level during delivery.

Related Code Sections

5705.2 Flammable and Combustible Liquids, Liquid Transfer
are introduced to provide for transfer of Class I liquids, or Class II and III liquids transferred at temperatures at or above their flash points ...
5705.2 Flammable and Combustible Liquids, Liquid Transfer
are introduced to provide for transfer of Class I liquids, or Class II and III liquids transferred at temperatures at or above their flash points ...