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0 u Integrated Site Operating Controllers (SOCs) are a new development to the industry. For several years there have been systems that offered tank level gauging and line leak functions, however, a closer evaluation of these products revealed that they contained only stand alone tank level gauging controllers and line leak controllers mounted in a common enclosure. Significant performance gains are achieved when all external and internal sensor signals, located at one site, are processed by one controller. Events identified by one sensor can then be used to better control or evaluate the events of another. An example was previously mentioned where the activity of the product pump, a known value In the line leak system, can be used to abort and then re -Start the tank testing function. This allows the tank testing function to always be active during times of no pumping activity, thereby not affecting sales. The tank level probe can be used to stop the pump when the tank level reaches a predetermined low point. This eleminates potential pump motor overheating. The Integrated Site Controller can be used to automatically alternate between tanks when two tanks are used for the same product. In this case, the tank level probe is used to identify which of the two tanks has the highest level. This tank will be used on the next pumping cycle. Tank selection by level allows the tanks to empty at a uniform rate and thus improve the product ordering/delivery process. The Integrated Site Controller can project the anticipated tank levels for 12, 24, 36, or 48 hours into the future, for all products, based on recent sales volume. This projection is constantly updated based upon the most recent i sales. Upon achieving a preset low level in any tank, the controller can automatically place an order, for all products, to make the most efficient use of the specific delivery trucks. Control Engineers, U.S.A. Page 16