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Y <br /> 0 <br /> GENERAL DEFINITIONS <br /> "Monitoring" Means Either: <br /> 1 . An early warning system that provides continouus surveillance for <br /> leaks and spills: <br /> 2. Routine area-wide surveillance methods that may be used to <br /> investigate or pinpoint the source of a spill or leak. <br /> Testing, by contrast, refers to use of special equipment and/or methods which <br /> are not a part of normal operations. System testing is used to determine <br /> whether a tank or pipe system is leaking at a particular time. <br /> Earlv Warninq Leak Detection. <br /> 1 . Inventory reconciliation. <br /> 2. Interstitial monitoring in double-walled tanks. <br /> 3. Systems that monitor tank excavations. <br /> Leak Interception and Direction Systems: <br /> 1 . Vault, trough or pan under tank sloped 1/4" per 1" to a monitoring <br /> well . <br /> 2. Outer shell of double-walled tank. <br /> 8 <br />