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Recommended Practices for the Testing and Verification of Spill, Overfill, Leak Detection and Secondary Containment Equipment at UST Facilities 2. DEFINITIONS When used in this document, the terms listed below have the following meanings: 2.1 Appropriate Person. The individual or organi- zation designated by the facility owner or operator to receive notification of any problems or defects noted during any routine inspection procedure described in this recommended practice. It is the responsibility of the "appropriate person" to assess the nature of the problem or defect and initiate appropriate action. 2.2 Authority Having Jurisdiction (AHJ). An orga- nization, office or individual responsible for enforcing the requirements of a code or standard, or for approving equipment, materials, an installation or a procedure. 2.3 Automatic Tank Gauge (ATG). An electronic device that consists of a probe that measures liquid level and a console that calculates the liquid volume in that underground storage tank (UST). By monitoring the liquid level, the ATG can conduct leak tests of the under- ground tank. Accessory devices that monitor pressurized piping, interstitial spaces and containment sumps also can be connected to the ATG console. 2.4 Ball Float Valve. An overfill prevention device that operates by restricting the vent opening in a UST, thus limiting the flow of fuel into the tank. 2.5 Class I, Division 1. Part of a classification system used in the National Electrical Code (NFPA 70) published by the National Fire Protection Association (NFPA) to describe the fire or explosion hazard present in a specific area. A Class I, Division 1 area is a location where flam- mable gases, flammable liquid -produced vapors or com- bustible liquid -produced vapors: • can exist at ignitable concentrations under normal operating conditions; • may frequently exist at ignitable concentrations because of repair or maintenance operations or because of leakage; might be released in ignitable concentrations by the breakdown or faulty operation of equipment or processes that might also cause the simultaneous failure of electrical equipment. For example, the area inside a fuel dispenser that contains product piping and most spaces beneath the access covers of a UST are Class I, Division 1 areas. 2.6 Classified Area. A general term for a location where fire or explosion hazards may exist due to the presence of flammable gases, flammable liquid -produced vapors or combustible liquid -produced vapors. Classified areas are described in national fire and electrical codes. For example, see the definition for Class I, Division 1 in this chapter. 2.7 Containment Sump. A liquid -tight container that protects the environment by containing leaks and spills from piping, dispensers, pumps and related components. Containment sumps may be single -walled or double - walled. Typical. locations include the top of a tank (fill sump or submersible turbine pump sump), underneath the dispenser (under -dispenser sump), or at other points in the piping run (transition or intermediate sump). 2.8 Discriminating Sensor. See "Sensor." 2.9 Dispenser Sump. See "Containment Sump." 2.10 Drop Tube. A tube installed in the fill pipe of a UST that extends from the top of the fill pipe to within 4 to 6 inches of the bottom of the tank. The drop tube increases the delivery flow rate and reduces the volume of vapors generated during a delivery. 2.11 Drop Tube Shutoff Valve. A mechanism installed in a drop tube designed to prevent the overfill of a UST by shutting off product delivery when the tank is nearly full. Drop tube shutoff valves are frequently referred to as "flapper valves." 2.12 Emergency Stop. A clearly identified switch or button that disconnects all power to dispensers, pumps and electrical equipment in the area surrounding fuel dispensers. The switch or button may be inside or outside a building. Also known as an "E -Stop," "emergency shut- off switch" or "ESO." 2.13 Interstitial Space. The area between the primary and secondary containment of a double -walled tank, double -walled piping or other double -walled component. Also known as the "interstice" or "annular space". 2.14 Intrinsically Safe Circuit. A circuit in which any spark or thermal effect is not capable of causing ignition of a mixture of flammable or combustible material under prescribed test conditions. In general, an intrinsically safe circuit is a low-energy electrical circuit that cannot gener- ate enough heat or produce a spark large enough to ignite fuel vapors. 2.15 Leak Detection. Any procedure or equipment that can be used to determine whether an underground pei.org 0