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How does TRUCHEK work? Primary-Tank Leak in Wet Hole or Dry Hole Vent Reservoir Level Down Secondary-Tank Leak in Dry Hole Vent Reservoir Level Down Secondary-Tank Leak in Wet Hole Vent Reservoir Level Up in Outer Wall TRUCHEK® — state-of-the-art continuous monitoring To enhance the double-wall protection of a Xerxes® tank, Xerxes offers the option of TRUCHEK, its state-of-the-art system of hydrostatic, tank monitoring for double-wall tanks. TRUCHEK is an easy, precise and reliable method for both continuous leak detection and tank- tightness testing. Like the tanks that Xerxes manufactures, TRUCHEK provides a long, successful record of performance. Continuous leak detection For nearly two decades, the Xerxes® TRUCHEK system has suc- cessfully moni- tored thousands of tanks in many different types of installations. In fact, it has be- come an industry standard as a state-of-the-art technique for continuous monitoring. Changing regulations in some markets, such as California, require that new double-wall tanks have continuous leak detection using a constant vacuum, air pressure or hydrostatic pressure in the interstice of a double-wall tank. A Xerxes tank with TRUCHEK's continuous leak detection is the ideal solution for complying with these strict new requirements. While being highly effective, TRUCHEK is also simple and trou- ble-free in both design and operation. With TRUCHEK, simple monitoring of the fluid level inside the reservoir of a Xerxes dou- ble-wall tank is all that is necessary. When you order a Xerxes double-wall tank with the TRUCHEK option, the interstice be- tween the two tank walls is filled at the factory with a monitor- ing fluid. This water/calcium-chloride fluid also partially fills a reservoir on the top of the tank. This creates a hydrostatic pres- sure throughout the interstice, enabling the operator to monitor the walls of both the primary tank and the secondary tank. An electronic probe placed in the tank's reservoir alarms when the fluid level either falls below or rises above the acceptable level. (See the Xerxes TRUCHEK brochure for more information.) Tank-tightness testing TRUCHEK also provides a simple, precise and reliable method to perform a tank-tightness test. It takes into account the impacts of thermal expansion or contraction of the product, vapor pock- ets, tank deflection, evaporation, condensation and the location of the water table. The 10-hour tightness-test procedure meets the strict NFPA 329 criteria. A shorter 4-hour test (while product is dispensing) exceeds EPA's criteria for a tank-tightness test. 6