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Recommended Practices for the Testing and Verification of Spill, Overfill, Leak Detection and Secondary Containment Equipment at UST Facilities 7. Inspect the probe. The floats must move freely on the stem without binding. If any parts are damaged or missing, contact the appropriate person. S. Reconnect the probe cable. 9. Set the fuel float in the middle of the probe and verify that it is showing the correct inch read- ing. 10. Slowly move the fuel float up the probe until the overfill alarm is triggered. If the float is moved too quickly, it may not trigger the alarm. 11. Measure the distance from the bottom of the probe to the fuel float when the float first trig- gers the alarm. S. ELECTRONIC MONITORING SYSTEM INSPECTION AND TESTING 8.1 General. Electronic underground storage tank (UST) monitoring systems provide a warning or alarm when a leak in the UST system occurs. The monitoring system and sensors need to be programmed to reflect the conditions for each individual site to ensure proper operation. For the remainder of this section, the term "ATG" shall be used to refer to all electronic UST monitoring systems whether they have an automatic tank gauge probe or are solely an electronic alarm for sensors installed. "ATG' is a general industry term that is used to identify all electronic tank monitoring equipment. J.2. On the tank chart, find the volume that corre- Before starting any testing, print out the system configu- sponds to the height of the float and determine ration on the ATG console (if equipped with a printer) the percent of tank capacity. and verify that site setup parameters are correct. Make Use this formula to determine the percent of sure that the sensors are correctly labeled to indicate their tank capacity at which the alarm was triggered: location. Percent Tank Capacity = (product volume Keep completed compliance tests on file to confirm that when 90 percent alarm triggered/total tank during the test: volume) x 100 13. Clear the alarm condition. 14. Compare the measurements in Steps 11 and 12 to the values programmed into the console. 15. Reinstall the ATG probe. 7.3.7 Pass/Fall Criteria. • If the overfill alarm(s) activates when the tank is no more than 90 percent full, the overfill alarm passes the test. • If the fuel level on the console does not agree with the gauge stick reading, the system fails the test. • If the overfill alarm(s) does not activate in the test mode, it fails the test. • If the overfill alarm(s) does not activate or acti- vates at any product level above 90 percent tank capacity, it fails the test. • the system was continuously powered and monitored for the data collection period; • tank probes and leak sensors were functioning properly. FIGURE 8-1. The indicator lights and the LCD display on the monitoring console show the status of the UST system. 8.2 ATG Probes. ATG probes continuously measure the product level in a UST using an in -tank probe con- nected to a console. To properly evaluate its condition, the probe needs to be removed from the tank and visually inspected. peLorg