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THE OVERFLOW PROTECTION SYSTEM <br /> 1. Both the fluid level is visually monitored and the filling operation is <br /> controlled by the facility operator during filling of the underground storage <br /> tank. <br /> 2. The available capacity of the underground storage tank to be filled is <br /> determined immediately prior to filling to be at least 103 percent of the volume <br /> of the entire tank compartment to be delivered or the volume of the entire tank <br /> compartment to be delivered plus 200 gallons, whichever is less. <br /> 3. The hazardous substance being delivered can be metered into the underground <br /> storage tank and the available underground storage tank capacity is determined <br /> immediately prior to filling. <br />