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• Monitoring • Alternative Monitoring Systems: A Performance Comparison Fluid Liquid Vacuum Containment Inc. Sensors In Or Air Gasoline Hydrostatic Dry Annular Pressure Vapor Leak Detection Performance Tank Monitor Space Monitors Sensors Meets EPA criteria as a precision tank test Yes No No No Monitors inner wall totally Yes No(')(s) Large Leaks Yes Optional electronic equipment tested and Yes Unknown Onlyt" Unknown Monitors outer wall totally Yes No(2)(3)(6) Large Leaks N65)(3)(7) Long-term proven performance of Yes Unknown Only(4)(3) Unknown Prevents product from escaping into the Yes No(3) NoP No(3) annular space with an inner wall leak • Proven In Use Leak detection performance independently Yes Unknown Unknown Unknown tested and statistically validated Optional electronic equipment tested and Yes Unknown Unknown Unknown labeled by Underwriters Laboratories Long-term proven performance of Yes Unknown Unknown Unknown tank monitor Design Awards • Winner of National Safety Council Yes No No No Award for achievements in product safety Footnotes: (1) Only monitors the portion of the inner wall which is in contact with liquid product. (2) Only monitors the portion of the outer wall which is submerged in groundwater. (3) With an inner wall leak, product can leak to the outer wall. Then if the outer tank has an unknown leak, product will spill. (4) The vacuum or pressure pump can mask small leaks in the inner and/or outer tank wall. This pump is normally required to compensate for pressure and vacuum losses caused by line losses or changes in product temperatures. (5) Does not monitor any portion of the outer wall. (6) If the outer wall has a larger leak than the inner wall, product may spill without accumulating in the annular space. (7) If the annular space is contaminated with product, residual fumes are difficult to remove. Electronics Fluid Containment monitoring and inventory control components can be configured to satisfy a wide range of customer requirements. Optional Fluid Containment components—control and switch panels, sensors, probes • and gauges—are available for all double-wall, single-wall, compartment and oil/water separator tanks as well as for single or multiple tank installations.