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Ameron Dualoy° Pipe Monitoring System 5.0 DISCUSSION The use of a brine-filled interstice for leak detection purposes is a viable method for preventing loss of product to the environment. It must be emphasized that the brine reservoir size, initial brine level, and spacing of the sensors are important factors for preventing nuisance alarms. These should be considered in the design of the equipment and identified by the manufacturer regarding the maximum length of pipe the reservoir and sensor will service. With the Ameron system, any dual point sensor with dimensions that will fit into the brine reservoir can be installed. The sensors must then be attached to the proper monitoring equipment, which in many cases can be the ATG already installed at the test site. It is important that the high level alarm be configured to shut down the turbine immediately to prevent possible loss of product from the reservoir. The pressure tests indicate that only very small changes occur as a result of pressurizing the inner pipe. The Ameron Dualoy°pipe is fairly rigid so this small effect is not unexpected. There are two types of temperature changes that could be important for this system. First, there are short-term effects from the delivery of fuel with a large temperature difference between the fuel added to the tank and the existing ground temperature. Dispensing of fuel of a different temperature can produce relatively large short-term changes in the temperature of the pipe including the interstice. This type of change is fairly fast as can be seen in the temperature data in Appendix D. A second more important type of temperature change is a result of the slow seasonal effects that are manifested as a slow change in the ground temperature. These effects produce a slow change in the brine level between summer and winter. The magnitude of this effect is the same as for a more rapid temperature change. Seasonal ground temperature changes are of the order of 30 deg F. The effects of both types of temperature changes can be minimized if trapped air is removed from the pipe and fittings. The Ameron Pipe Monitor will sense the cumulative effect of small leaks. It will alarm when approximately 1 liter of fluid is added or removed from the reservoir no matter what the time interval has been. It operates in a true continuous fashion in that it does not need to wait for quiet periods or other factors that might delay the detection of a leak. Page 13 of 13