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Xerxes DWT II double wall tanks with the <br />TRU-CHEK'system option are factory -filled with a <br />brine solution in the interstice between the two tank <br />walls. The brine also partially fills a reservoir affixed <br />to the top of the tank. This creates a hydrostatic <br />pressure which enables you to monitor both the <br />primary tank and the secondary tank walls. <br />How continuous monitoring works. <br />If there is a fracture in the inner wall (Diagram <br />A), the brine level in the reservoir will go down. The <br />brine level will also go down, if there is a leak in the <br />outer wall (Diagram B). <br />With a high water table and "wet -hole" <br />conditions (Diagram C), a leak in the outer wall <br />will cause the brine level to go up if the height of <br />the water table above the leak is 30% greater than <br />the brine level above the leak. <br />Advantages of the TRU-CHEK" system. <br />• 360° secondary containment system provides <br />maximum leak detection capability. <br />• Both the primary and secondary tank walls are <br />continuously monitored for leaks. <br />• False alarms are minimised, because the monitoring <br />space is isolated between the inner and outer tank. <br />• There is a built-in capability for tank tightness <br />testing. (See next page.) <br />• The system also provides the opportunity to use an <br />electronic or manual monitoring system. <br />L�_ <br />Reservoir <br />Level Down <br />Diagram A <br />Diagram B <br />Reservoir <br />Level Up <br />n <br />Water Level <br />— — — Above Tank <br />— Fracture <br />— Outer Wall <br />Diagram C <br />•stanJpi@ .,N. n m D again Cie prod I,J by the im ullamt <br />amtnwwr nd not hp Xerxes Corl—m.et. <br />